MPRM48NH480M250A00

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Document overview

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Technical content

Features

• Optimized for operation with MIL-COTS BCM® in 270 VDC Applications
• MIL-STD-704E/F compliant when used with MBCM270x450M270A00
• 48.0 V nominal input non-isolated ZVS buck-boost regulator
• Input Transient operation between 30.0 V and 60.0 V
• 20.0 V to 55.0 V adjustable output range
• 250 W output power in 0.57 in2 footprint
• 96.7% typical efficiency, at full load
• 1676 W/in3 (102 W/cm3) Power Density
• 5.29 MHrs MTBF (MIL-HDBK-217 Plus Parts Count)
• Pin selectable operating mode Adaptive Loop Remote Sense / Slave
• Half VI Chip® Package 22.0mm x 16.5mm x 6.73mm Typical Applications
• High Voltage 270 V Aircraft Distributed Power
• High Density Power Supplies
• Communication Systems Product Description The VI Chip® PRMTM Regulator is a high e ciency converter, operating from a 38.0 to 55.0 Vdc input to generate a regulated 20.0 to 55.0 Vdc output. The ZVS buck-boost topology enables high switching frequency (~ 1.03 MHz) operation with high conversion e ciency. High switching frequency reduces the size of reactive components enabling power density up to

1676 W/in

The Half VI Chip package is compatible with standard pick-and- place and surface mount assembly processes with a planar thermal interface area and superior thermal conductivity. The MPRM48NH480M250A00 is optimized for operation with MIL-COTs BCMs in MIL-STD-704 E/F 270 VDC systems. In a

270 VDC system, the upstream BCM provides an interface and

isolation between the high voltage DC bus and the PRM, conv erting the input down by a fixed ratio. The downstream PRM and VTMTM current multiplier minimize distribution and conversion losses in a high power solution, providing an isolated, regulated output voltage. The MPRM48NH480M250A00 has two selectable modes of regulation depending on the application requirements. In Adaptive Loop Operation, the MPRM48NH480M250A00 utilizes a unique feed-forward scheme that enables precise regulation of an isolated POL voltage without the need for remote sensing and voltage feedback. In Remote Sense Operation, the internal regulation circuitry is disabled, and an external control loop and current sensor maintain regulation. This a ords flexibility in the design of both voltage and current compensation loops to optimize performance in the end application. MIL-COTS PRMTM Regulator Rev 1.1 vicorpower.com Page 1 of 44 09/2015 800 927.9474 High Efficiency Converter MIL-COTS PRM TM Regulator for MIL-STD 704E/F Applications M PRM48NH480M250A00 Product Ratings VIN = 38.0 V to 55.0 V (30.0 V to 60.0 V for up to 150 ms) POUT = 250 W VOUT = 48.0 V (20.0 V to 55.0 V Trim) IOUT = 5.21 A

Rev 1.1 vicorpower.comMIL-COTS PRMTM Regulator Page 2 of 44 09/2015 800 927.9474 M PRM48NH480M250A00 PRM ENABLE TRIM SHARE/ CONTROL NODE AL IFB VC VT VAUX REF/ REF_EN +IN –IN +OUT –OUT TM VC PC VOUT +IN –IN –OUT +OUT Adaptive Loop Temperature Feedback VTM Start Up Pulse SGND SGND RTRIM SGND VF: 20 V to 55 V SEC_GND VTM CIN_PRM CO_PRM COUT LO_PRM RAL BCM VAUX EN +IN –IN +OUT –OUT FUSE ISOLATION BOUNDRY PRIMARY SEC ONDARY TM CI_BCM PRI_GND VIN RI_PRM LI_PRM SGND ON/OFF CONTROL PRM ENABLE TRIM SHARE/ CONTROL NODE AL IFB VC VT VAUX REF/ REF_EN +IN –IN +OUT –OUT SGND SGND ON/OFF CONTROL SGND CIN COUT Voltage Sense and Error Amplifier (Single Ended) SGND V + VOUT –IN+IN V – SGND External Current Sense and Feedback VOUT

20 V to 55 V

Voltage Reference with Soft Start SGND IN OUT GND RSS CSS 10 k SGND VREF VREF REF 3312 BCM VAUX EN +IN –IN +OUT –OUT FUSE ISOLATION BOUNDRY PRIMARY SEC ONDARY TM CI_BCM PRI_GND VIN RI_PRM LI_PRM SEC_GND Typical Applications Typical Application: MBCM270x450M270A00 + MPRM48NH480M250A00 Remote Sense Configuration Typical Application: MBCM270x 450M270A00 + MPRM48NH480M250A00 + VTM Adaptive loop Configuration

Rev 1.1 vicorpower.comMIL-COTS PRMTM Regulator Page 3 of 44 09/2015 800 927.9474 M PRM48NH480M250A00 Half VIC 1 2 3 4 A B C D E F G H A B C D E F G H SHARE/ CONTROL NODE ENABLE TRIM NC NC AL VT VAUX IFB SGND REF/REF_EN VC +IN -IN +OUT -OUT TOP VIEW Pin Configuration Pin Number Signal Name Type Function SHARE A1 (Adaptive Loop / Slave Operation) BIDIR Parallel sharing control bus for master-slave configuration. CONTROL NODE Modulator control node input. Driven by external error amplifier in Remote Sense (Remote Sense Operation) INPUT Operation. A3 VT INPUT VTM TM input for temperature compensation. Leave disconnected for Remote Sense (Adaptive Loop Operation) Operation. B2 ENABLE BIDIR Enables power supply when allowed to float high. 5 V during normal operation. B4 VAUX OUTPUT 9 V auxiliary bias voltage. C1 TRIM INPUT Selects operating mode. Adjusts output voltage in Adaptive Loop Operation. C3 IFB INPUT Current sense input for current limit and overcurrent protection in Remote Sense Operation. (Remote Sense Operation) Leave disconnected for Adaptive Loop Operation. D2 NC n/a Do not connect this pin. D4 SGND INPUT Signal ground, reference for analog controls. Kelvin connected internally to –IN and –OUT. E1 NC n/a Do not connect this pin. REF E3 (Adaptive Loop Operation) OUTPUT Reference voltage for internal error amplifier in Adaptive Loop Operation. REF_EN (Remote Sense Operation) OUTPUT Powers and enables external control circuit voltage reference in Remote Sense Operation. F2 AL INPUT Adaptive loop gain control. Sets the magnitude of the Adaptive Loop load line in Adaptive (Adaptive Loop Operation) Loop Operation. Leave disconnected for Remote Sense Operation. F4 VC OUTPUT Bias voltage to power VTM module during start up G1,G2 +IN INPUT Positive input power terminalPOWER G3,G4 +OUT OUTPUT Positive output power terminal POWER H1,H2 -IN INPUT Negative input power terminal. Connected internally to -OUT.POWER RETURN H3,H4 -OUT OUTPUT Negative output power terminal. Connected internally to -IN.POWER RETURN Pin Descriptions

Rev 1.1 vicorpower.comMIL-COTS PRMTM Regulator Page 4 of 44 09/2015 800 927.9474 M PRM48NH480M250A00 Part Ordering Information Standard Models Absolute Maximum Ratings The ABSOLUTE MAXIMUM ratings below are stress ratings only. Operation at or beyond these maximum ratings can cause permanent damage to device. Electrical specifications do not apply when operating beyond rated operating conditions. Operating beyond rated operating conditions for extended period of time may affect device reliability. All voltages are specified relative to SGND unless otherwise noted. Positive pin current represents current flowing out of the pin. Device Input Voltage Range Package Type Output Voltage x 10 Temperature Grade Output Power Revision Version MPRM 48N H 480 M 250 A 00 MPRM = MIL-COTS PRM 48N = 38.0 V - 55.0 V H = Half VIC SMD 480 = 48.0 V M = -55 to 125°C 250 = 250 W A 00 = AL / RS Part Number VIN Package Type VOUT Temperature Power Version MPRM48NH480M250A00 38.0 V - 55.0 V Half VIC SMD 48.0 V (20.0 V to 55.0 V) -55 to 125°C 250 W AL / RS (Pin Selectable) Parameter Comments Min Max Unit SHARE / CONTROL NODE -0.3 10.5 V +/-10 mA ENABLE -0.3 5.5 V +/-10 mA +IN TO –IN Continuous, non-operating -1 80 V 100 ms, non-Operating 100 V VAUX -0.5 10.5 V +/-100 mA SGND +/-100 mA IFB -0.5 5.7 V REF / REF_EN -0.3 3.6 V Remote Sense Operation (REF _EN) 10 mA Adaptive Loop Operation (REF) 3.4 mA TRIM -0.3 3.6 V AL -0.3 3.6 V VT -0.3 4.8 V VC TO -OUT -0.5 18 V +/-1.8 A +OUT to -OUT -1 62 V Output Current 7.3 A Internal Operating Temperature M Grade -55 125 °C Storage Temperature M Grade -65 125 °C

Rev 1.1 vicorpower.comMIL-COTS PRMTM Regulator Page 5 of 44 09/2015 800 927.9474 M PRM48NH480M250A00 Electrical Specifications Specifications apply over all line and load conditions, and trim from 20.0 V to 55.0 V, unless otherwise noted; Boldface specifications apply over the temperature range of -55ºC < TINT < 125ºC; All other specifications are at TINT = 25ºC unless otherwise noted. Attribute Symbol Conditions / Notes Min Typ Max Unit Power Input Specification Input Voltage Range VIN Continuous, operating 38.0 48.0 55.0 V Input Voltage Range Transient V IN_TRANS Derated current or power supported, 150 ms max, 30.0 60.0 V 10% duty cycle max. See Figure 42. VIN Slew Rate dV IN /dt 0 ≤ VIN ≤ 55.0 V 0.001 1000 V/ms Initialization Voltage VINIT Internal micro controller initialization voltage 10 V Initialization Delay tINIT From VIN first crossing VINIT 5.0 7.0 9.0 ms No Load Power Dissipation PNL ENABLE HIGH, VIN = 48.0 V 2.4 3.5 W Input Quiescent Current IQC ENABLE LOW, V IN = 48.0 V 14.5 20.0 mA Input Capacitance (Internal) C IN_INT Effective value, VIN = 48.0 V (see Fig.13)2 µF Input Capacitance (Internal) ESR R CIN Effective value, VIN = 48.0 V 3.0 mΩ Power Output Specification Rated Output Current IOUT Standalone and Master Operation, see Figure 1, SOA 5.21 A Rated Output Power POUT Standalone and Master Operation, see Figure 1, SOA 250 W VIN = 48.0 V VOUT = 48.0 V, Switching Frequency FSW IOUT = 2.60 A, TINT = 25°C 0.94 1.03 1.07 MHz Over line, load, trim and temperature, 0.70 1.07 MHzexclusive of burst mode From VIN first crossing VIN_UVLO+_SUPV 20 µs Output Turn-ON Delay tON to ENABLE high; tINITexpired From ENABLE pin release to ENABLE high, VIN applied, tOFFexpired 20 µs Start up Sequence Timeout t STARTUP_SEQ From ENABLE high to start up sequence complete 17 ms VIN = 38.0 V to 55.0 V, IOUT = 5.21 A, TINT = 25°C, over trim 92.0 % VIN = 48.0 V, VOUT = 48.0 V, IOUT = 5.21 A, TINT = 100°C 95.5 96.5 % VIN = 48.0 V, VOUT = 48.0 V, IOUT = 2.60 A, TINT = 100°C 94.5 95.8 % Efficiency Hot ηHOT VIN = 38.0 V to 55.0 V , VOUT = 48.0 V, IOUT = 5.21 A, TINT = 100°C 94.8 % VIN = 38.0 V to 55.0 V , IOUT = 5.21 A, TINT = 100°C, over trim 91.3 % Efficiency Over Temperature η >50% load and V OUT = 48.0 V; over temperature 94.0 % >50% load; over temperature and trim 89.2 % Output Discharge current IOD Average Value 0.5 mA Output Voltage Ripple VOUT_PP VIN = 48.0 V, VOUT = 48.0 V, IOUT = 5.21 A, COUT_EXT = 0 F, 20 MHz BW 1110 1665 mV Output Inductance (Parasitic) L OUT_PAR Frequency @ 1.03 MHz, Simulated J-Lead model 2.5 nH Output Capacitance (Internal) C OUT_INT Effective value, VOUT = 48.0 V (see Fig.13)2 µF Output Capacitance (Internal) ESR RCOUT Effective value, VOUT = 48.0 V 3.0 mΩ

Rev 1.1 vicorpower.comMIL-COTS PRMTM Regulator Page 6 of 44 09/2015 800 927.9474 M PRM48NH480M250A00 Electrical Specifications (cont.) Specifications apply over all line and load conditions, and trim from 20.0 V to 55.0 V, unless otherwise noted; Boldface specifications apply over the temperature range of -55ºC < TINT < 125ºC; All other specifications are at TINT = 25ºC unless otherwise noted. Attribute Symbol Conditions / Notes Min Typ Max Unit Power Output Specifications: Adaptive Loop Operation Output Voltage Setpoint VOUT_SET No load, trim Inactive, Adaptive Loop load line inactive47.00 48.00 49.00 V Output Voltage Trim Range VOUT 20.0 55.0 V Output Voltage Rise Time tRISE_VOUT From soft start initiated to output voltage settled 1.7 1.8 1.9 ms Output Voltage Load Regulation VOUT_REG_LOAD Adaptive loop load line inactive 0.02 0.2 % Output Voltage Line Regulation VOUT_REG_LINE Adaptive loop load line inactive 0.02 0.2 % Total Regulation Error VOUT_REG_TOTAL PRM output voltage, Adaptive Loop load line inactive 0.2 % VTM output voltage, total Adaptive Loop regulation, 1 3 % Total AL Regulation Error VOUT_REG_AL VOUT = 48.0 V, trim inactive VTM output voltage, total Adaptive Loop regulation, 5 %trim active, exclusive of external resistor tolerances Line Frequency Ripple Rejection PSRR 120HZ 120Hz, COUT_EXT = 0 F, IOUT = 2.60 A 60 dB Over line, load, trim and temperature 5.3 7.75 A Load Capacitance (Electrolytic) CLOAD_ALEL 0.1Ω ≤ ESR ≤1 Ω, See Figure 32, total capacitance (CLOAD_ALEL + CLOAD_CER ) ≤47 µF 47 µF Load Capacitance (Ceramic) C LOAD_CER 2m Ω ≤ ESR ≤200 mΩ, See Figure 32 25 µF Load Transient Voltage Deviation V TRANS 10% ↔ 100% load step, 10 A/µsec, 0 µF COUT, 4.8 Vdeviation from initial setpoint 10% ↔ 100% load step, 10 A/µsec, 0 µF COUT, Recovery to 90% of final value, Adaptive Loop 100 µs Load Transient Recovery Time t TRANS load line inactive 10% ↔ 100% load step, 10 A/µsec, 0 µF C OUT, Recovery to 90% of final value, 500 µs Adaptive Loop load line active, VAL = 0.96 V Power Output Specifications: Slave Operation with AL Master Slave Operation within an array, up to 5°C case 4.2 A Rated Current Within an Array I OUT_ARRAY temperature differential, master-slave configuration Slave Operation within an array, up to 30°C case 3.6 Atemperature differential, master-slave configuration Slave Operation within an array, up to 5°C case 200 W Rated Power Within an Array P OUT_ARRAY temperature differential, master-slave configuration Slave Operation within an array, up to 30°C case 175 W temperature differential, master-slave configuration Equal input, and output voltage at full load; 15 % VIN = 48.0 V, VOUT = 48.0 V Equal input and output voltage at full load; Current Sharing Difference IOUT_SHARE_MS Over line and trim, with 25°C ≤TC ≤ 100°C and ≤5°C 15 % (Master to Slave) part-part temp. mismatch Equal input, and output voltage at full load; Over line and trim, with 25°C ≤ T C ≤ 100°C 20 % and ≤ 30°C part-part temp. mismatch

Rev 1.1 vicorpower.comMIL-COTS PRMTM Regulator Page 7 of 44 09/2015 800 927.9474 M PRM48NH480M250A00 Electrical Specifications (cont.) Specifications apply over all line and load conditions, and trim from 20.0 V to 55.0 V, unless otherwise noted; Boldface specifications apply over the temperature range of -55ºC < TINT < 125ºC; All other specifications are at TINT = 25ºC unless otherwise noted. Attribute Symbol Conditions / Notes Min Typ Max Unit Powertrain Protections Input Undervoltage Turn-ON VIN_UVLO+ 24.5 26.0 V Input Undervoltage Turn-OFF VIN_UVLO- Instantaneous powertrain shutdown, detected after tBLANK 22.0 22.7 V Input Undervoltage Hysteresis VUVLO_HYST (VIN_UVLO+ ) - (VIN_UVLO-) 1.8 2.2 2.5 V Input Overvoltage Turn-ON VIN_OVLO- 58.3 60.0 V Input Overvoltage Turn-OFF VIN_OVLO+ Instantaneous powertrain shutdown, detected after tBLANK 63.6 67.3 V Input Overvoltage Hysteresis VOVLO_HYST (VIN_OVLO+) - (VIN_OVLO-) 2.9 3.6 4.3 V Output Overvoltage Threshold VOUT_OVP+ Instantaneous shutdown, detected after tPROT 56.0 57.9 60.0 V Minimum Current Limited Vout VOUT_UVP 12 V Overtemperature Shutdown Setpoint T INT_OTP Instantaneous shutdown, detected after tPROT 125 ºC Output Power Limit PPROT 250 W Short Circuit VOUT Threshold VSC_VOUT 8.8 V Short Circuit VOUT Recovery Threshold V SC_VOUTR 9.5 V Short Circuit CONTROL NODE Threshold VSC_VCN 7.2 V Short Circuit CONTROL NODE VSC_VCNR 6.9 VRecovery Threshold Short Circuit Timeout tSC Short circuit fault detected after VSC _VOUT and VSC _VCN thresholds persist for this time 5 ms Short Circuit Recovery Time tSCR Excludes tOFF 75 ms Overcurrent (IFB) and tBLANK 50 130 160 µsInput Over/Undervoltage Blanking Time Overtemperature, Output Overvoltage and ENABLE Shutdown Response Time t PROT 2 µs (Hardware) Powertrain Supervisory Limits Input Undervoltage Turn-ON VIN_UVLO+_SUPV 35.9 37.0 V(Supervisory) Input Undervoltage Turn-OFF V IN_UVLO-_SUPV Powertrain shutdown, detected after tLIM_SUPV 23.5 25.7 V(Supervisory) Input Undervoltage Hysteresis V UVLO_HYST_SUPV (VIN_UVLO+_SUPV ) - (VIN_UVLO-_SUPV ) 8.7 10.2 11.7 V(Supervisory) Undertemperature Shutdown Setpoint T INT_UTP M Grade -55 ºC(Supervisory) Supervisory Limit Response Time t LIM_SUPV 150 µs

Rev 1.1 vicorpower.comMIL-COTS PRMTM Regulator Page 8 of 44 09/2015 800 927.9474 M PRM48NH480M250A00 Electrical Specifications (cont.) Specifications apply over all line and load conditions, and trim from 20.0 V to 55.0 V, unless otherwise noted; Boldface specifications apply over the temperature range of -55ºC < TINT < 125ºC; All other specifications are at TINT = 25ºC unless otherwise noted. Attribute Symbol Conditions / Notes Min Typ Max Unit Power Output Specifications: Slave Operations (cont.) Equal input, output, and SHARE voltage at full load; VIN = 48.0 V, VOUT = 48.0 V 5 % Equal input, output and SHARE voltage at full load; Current Sharing Difference IOUT_SHARE_SS Over line and trim, with 25°C ≤TC ≤ 100°C 10 % (Slave to Slave) and ≤5°C part-part temp. mismatch Equal input, output, and SHARE voltage at full load; Over line and trim, with 25°C ≤TC ≤ 100°C 15 % and ≤30°C part-part temp. mismatch Maximum Array Size N PRMS_PARALLEL Maximum number of parallel devices, 5 PRMsmaster-slave configuration Power Output Specifications: Remote Sense Operation Output Voltage Range VOUT 20.0 55.0 V Remote Sense Operation within an array, 4.7 A Rated Current Within an Array IOUT_ARRAY up to 5°C case temperature differential Remote Sense Operation within an array, 4.2 A up to 30°C case temperature differential Remote Sense Operation within an array, 225 W Rated Power Within an Array POUT_ARRAY up to 5°C case temperature differential Remote Sense Operation within an array, 200 W up to 30°C case temperature differential Equal input, output, and CONTROL NODE voltage 5 % at full load; VIN = 48.0 V, VOUT = 48.0 V Equal input, output and CONTROL NODE voltage at full load; Over line and trim, with 25°C ≤TC ≤ 100°C 10 % Current Sharing Difference IOUT_SHARE_RS and ≤5°C part-part temp. mismatch Equal input, output, and CONTROL NODE voltage at full load; Over line and trim, 15 % with 25°C ≤TC ≤ 100°Cand ≤30°C part-part temp. mismatch (worst case) Maximum Array Size N PRMS_PARALLEL Maximum number of parallel devices, Remote Sense 10 PRMsconfiguration, CONTROL NODE externally driven

Rev 1.1 vicorpower.comMIL-COTS PRMTM Regulator Page 9 of 44 09/2015 800 927.9474 M PRM48NH480M250A00 Line Dropout Characteristics Specifications apply during a line dropout condition VIN from 30.0 V to 38.0 V , and trim from 20 V to 55 V, unless otherwise noted. Boldfacespecifications apply over the temperature range of -55ºC < TINT < 125ºC. Line Dropout Specifications

• After startup if VIN drops below VIN_DROPOUT_EN- , a 150 msec line dropout timer is enabled
• Operation is sustained down to 30.0 V with specified derating for duration of timer
• Line dropout timer is disabled and normal operation resumes when VIN recovers above VIN_DROPOUT_DIS+
• Powertrain shutdown is initiated if VIN does not recover to above VIN_DROPOUT before the timer expires or if Vin falls below VIN_UVLO-_SUPV Attribute Symbol Conditions / Notes Min Typ Max Unit Line Dropout Timer VIN_DROPOUT_EN- Line dropout timer activated when input voltage 33.8 35.0 VEnable Threshold drops belowthis level Line Dropout Timer VIN_DROPOUT_DIS+ Line dropout timer disabled when input voltage 36.0 37.5 VDisable Threshold recovers abovethis level Line Dropout Timer Duration tDROPOUT Powertrain shutdown after timer expires 140 150 ms Line Dropout Minimum VIN_DROPOUT_MIN Minimum input voltage for sustained operation 30.0 VOperating Voltage Line Dropout Current Rating %I DROPOUT Percentage of rated current, linearly derated to 75% -18.8 + 3.1 x VIN %between 38.0 V and 30.0 V, see Figure 42 Line Dropout Power Rating %P DROPOUT Percentage of rated power, linearly derated to 75% -18.8 + 3.1 x VIN %between 38.0 V and 30.0 V, see Figure 42

Rev 1.1 vicorpower.comMIL-COTS PRMTM Regulator Page 10 of 44 09/2015 800 927.9474 M PRM48NH480M250A00 ENABLE

• The ENABLE pin enables and disables the PRM
• In PRM array configurations, ENABLE pins should be connected in order to synchronize start up
• ENABLE is 5 V with 1.8 mA source capability during normal operation Signal Type State Attribute Symbol Conditions / Notes Min Typ Max Unit Normal ENABLE Voltage V ENABLE 4.7 5.0 5.3 V Analog Output Operation ENABLE Current I ENABLE_OP 1.8 mA Start up ENABLE Source Current IENABLE_EN After tOFF 90 µA Minimum Time to Start t OFF 13.0 15.0 17.0 ms Start up ENABLE VENABLE_EN 2.5 3.2 V Enable Threshold ENABLE VENABLE_DIS 0.97 2.40 VDigital Input / Output Standby Disable Threshold ENABLE R ENABLE_EXT Resistance to SGND required 235 Ω Resistance (External) to disable the PRM Digital Output Fault ENABLE IENABLE_FAULT ENABLE voltage 1 V or above 4 mA Sink Current to SGND Signal Specifications Specifications apply over all line and load conditions, TINT = 25ºC and output voltage from 20.0 V to 55.0 V, unless otherwise noted. Boldfacespecifications apply over the temperature range of -55ºC < TINT < 125ºC. VAUX: Auxillary Voltage Source
• Intended to power auxiliary circuits
• 9 V during normal operation with 5 mA source capability Signal Type State Attribute Symbol Conditions / Notes Min Typ Max Unit VAUX Voltage VVAUX 8.6 9.0 9.5 V Normal VAUX Current IVAUX 5 mA Operation IOUT = 0A, CVAUX_EXT = 0. Maximum VAUX Voltage Ripple V VAUX_PP specification includes powertrain 100 400 mV Analog Output operation in burst mode. VAUX Capacitance C VAUX_EXT 0.04 µF Transition(External) VAUX Fault Response t FR_VAUX From fault recognition to 30 µs Time VAUX = 1.5 V VC: VTM Control
• Pulsed voltage source used to power and synchronize downstream VTM during start up
• 14 V, 10 ms typical voltage pulse Signal Type State Attribute Symbol Conditions / Notes Min Typ Max Unit VC Voltage VVC_START Connected to VTM VC or equivalent,13 14 18 V IVC = 115 mA, CVC = 3.2 uF Analog Output Start up VC Available Current I VC_START VC = 14 V, VIN > 20 V 200 mA VC Duration tVC 7 10 16 ms VC Slew Rate dVC/dt Connected to VTM or equivalent, IVC = 115 mA, CVC = 3.2 uF 0.02 0.25 V/µs ENABLE to VC Delay t ENABLE-VC 20 µs

Rev 1.1 vicorpower.comMIL-COTS PRMTM Regulator Page 11 of 44 09/2015 800 927.9474 M PRM48NH480M250A00 SGND: Signal Ground

• All control signals must be referenced to this pin, with the exception of VC
• SGND is internally connected to -IN and -OUT Signal Type State Attribute Symbol Conditions / Notes Min Typ Max Unit Analog Input / Output Any Maximum Allowable ISGND -100 100 mA Current Signal Specifications (cont.) Specifications apply over all line and load conditions, TINT = 25ºC and output voltage from 20.0 V to 55.0 V, unless otherwise noted. Boldfacespecifications apply over the temperature range of -55ºC < TINT < 125ºC. TRIM
• TRIM is used to select operating mode and trim the output voltage in Adaptive Loop Operation
• Internal pullup to VCC_INT through 10 kΩresistor
• When pulled below 0.45 V during power up, Remote Sense / Slave Operation is selected
• When allowed to pull up above 0.55 V during power up, Adaptive Loop Operation is selected
• Operating mode is detected during power up and cannot be changed unless input power is cycled Signal Type State Attribute Symbol Conditions / Notes Min Typ Max Unit Internally Generated VCC_INT 3.20 3.28 3.36 V Normal VCC Operation Internal Pullup RTRIM_INT 0.5% tolerance resistor 9.83 10.00 10.18 kΩ Resistance to VCC_INT Analog Input Mode Detection tMODE_DETECT From ENABLE high to mode detected,100 150 200 µs Delay after VIN first applied Mode Remote Sense Pull belowthis value during first Detect Enable Threshold VRS_MODE_EN start up after application of power to0.45 V enable Remote Sense / Slave Operation Remote Sense Pull abovethis value during first Disable Threshold VRS_MODE_DIS start up after application of power to 0.55 V enable Adaptive Loop Operation

Rev 1.1 vicorpower.comMIL-COTS PRMTM Regulator Page 12 of 44 09/2015 800 927.9474 M PRM48NH480M250A00 Signal Specifications (cont.) Specifications apply over all line and load conditions, TINT = 25ºC and output voltage from 20.0 V to 55.0 V, unless otherwise noted. Boldfacespecifications apply over the temperature range of -55ºC < TINT < 125ºC. TRIM (Adaptive Loop Operation Only)

• Provides dynamic trim control over the PRM output voltage in Adaptive Loop Operation
• Sampled prior to every start up to detect if trim is active or inactive
• Output voltage is equal to 20 times the voltage at the TRIM pin when applied TRIM voltage is within the active range
• Trim state is detected during normal operation and cannot be changed until start up is initiated Signal Type State Attribute Symbol Conditions / Notes Min Typ Max Unit Trim Enable Threshold VTRIM_EN Pull belowthis value during 3.10 V start up to enable trim control Trim Disable Threshold VTRIM_DIS Pull abovethis value during start up to disable trim control 3.20 V Start up Minimum Trim Disable RTRIM_DIS_MIN Minimum TRIM resistance required 10 MΩ Resistance to disable trim Trim Capacitance C TRIM_EXT 100 pF (External) Trim Sample Delay t ENABLE_TRIM From ENABLE high to TRIM sampled 100 150 200 µs Analog Input TRIM Pin VTRIM_RANGE See Figure 26 1.00 2.75 V Analog Range TRIM Gain G TRIM VOUT / VTRIM, 20 V / V VTRIM applied within active range Normal Trim Accuracy % ACC_TRIM Vout accuracy, exclusive of Operation external resistor tolerance 0.5 2.0 % VOUT Referred VOUT_RES 200 mVTrim Resolution Trim Latency tTRIM_LAT 65 130 260 µs Trim Bandwidth BW TRIM -3dB point 1.2 kHz

Rev 1.1 vicorpower.comMIL-COTS PRMTM Regulator Page 13 of 44 09/2015 800 927.9474 M PRM48NH480M250A00 AL: Adaptive Loop (Adaptive Loop Operation Only)

• Provides Adaptive Loop load line programming in Adaptive Loop Operation
• Internal pullup to VCC_INT through 10 kΩresistor
• Sampled prior to every start up to detect if Adaptive Loop load line is active or inactive
• Leave open to disable Adaptive Loop load line
• Not used in Remote Sense Operation Signal Type State Attribute Symbol Conditions / Notes Min Typ Max Unit AL Enable Threshold V AL_EN Pull below this value during start up3.10 V to enable AL load line AL Disable Threshold V AL_DIS Pull above this value during start up 3.20 V to disable AL load line Start up Minimum AL Disable RAL_DIS_MIN Minimum AL resistance required 10 MΩ Resistance to disable AL load line AL Capacitance C AL_EXT 100 pF (External) AL Sample Delay t ENABLE_AL From ENABLE high to AL sampled 100 150 200 µs Internally generated VCC_INT 3.20 3.28 3.36 V Analog Input VCC Internal Pullup RAL_INT 0.5% tolerance resistor 9.83 10.00 10.18 kΩ Resistance to VCC_INT AL Pin Analog Range V AL_RANGE 0 3.10 V Normal AL Gain G AL Positive correction slope, VT inactive 1.0 Ω/V Operation AL Load Line Accuracy % ACC_LL_AL Full load slope accuracy exclusive 0.5 2.0 % of external resistor tolerance AL Load Line Resolution LLAL_RES 3m Ω Maximum Output VOUT_AL_MAX Maximum increase from no 5 V Referred Compensation load setpoint, VOUT ≤ 55.0 V AL Latency tAL_LAT 65 130 260 µs AL Bandwidth BW AL -3dB point 1.2 kHz Signal Specifications (cont.) Specifications apply over all line and load conditions, TINT = 25ºC and output voltage from 20.0 V to 55.0 V, unless otherwise noted. Boldfacespecifications apply over the temperature range of -55ºC < TINT < 125ºC.

Rev 1.1 vicorpower.comMIL-COTS PRMTM Regulator Page 14 of 44 09/2015 800 927.9474 M PRM48NH480M250A00 Signal Specifications (cont.) Specifications apply over all line and load conditions, TINT = 25ºC and output voltage from 20.0 V to 55.0 V, unless otherwise noted. Boldfacespecifications apply over the temperature range of -55ºC < TINT < 125ºC. REF: Reference (Adaptive Loop Operation Only)

• Functions as REF pin in Adaptive Loop Operation
• REF represents the internal voltage reference for the voltage control circuit
• VOUT approximately equal to 20 times REF voltage Signal Type State Attribute Symbol Conditions / Notes Min Typ Max Unit REF Voltage VREF VOUT = 48.0 V, trim inactive 2.4 V REF to VOUT G REF_VOUT VOUT / VREF 20 V / V Normal Scale Factor Operation REF Resistance RREF_EXT 10 MΩ Analog Output (External) REF Capacitance C REF_EXT 200 pF (External) REF Voltage Ripple V REF_PP Includes burst mode, 20 MHz BW 25 mV ENABLE to REF Delay t ENABLE_REF ENABLE low to REF low 130 µs TransitionVAUX to REF Delay t VAUX_REF VAUX = 8.1 V to REF soft start ramp initiated 1 ms VT: VTM Temperature (Adaptive Loop Operation Only)
• VTM temperature compensation for Adaptive Loop regulation
• Adjusts the slope of the Adaptive Loop load line to account for changes in VTM output resistance over temperature
• Connect to TM pin of compatible downstream VTM to enable temperature compensation
• Leave disconnected to disable temperature compensation Signal Type State Attribute Symbol Conditions / Notes Min Typ Max Unit Internal Resistance RVT_INT 80.4 kΩ to SGND VT Enable Threshold V VT_EN 2.1 V VT Disable Threshold V VT_DIS Pull below this value to disable VT 1.9 V temperature compensation VT Disable Default TVT_DIS Default AL temperature setting Analog Input Normal Temperature when VT disabled 25 °C Operation VT Analog Range V VT_OP 2.18 3.98 V TCVT VT within active range, referenced 30 %/V VT Temperature to 2.98 V Coefficient TCVT VTM TM voltage applied, .01V/°K, referenced to 25°C 0.3 %/C VT Resolution TC VT_RES VTM TM voltage applied, .01V/°K 0.4 °C VT Latency tVT_LAT 65 130 260 µs Bandwidth BW VT -3dB point 1.5 kHz

Rev 1.1 vicorpower.comMIL-COTS PRMTM Regulator Page 15 of 44 09/2015 800 927.9474 M PRM48NH480M250A00 Signal Specifications (cont.) Specifications apply over all line and load conditions, TINT = 25ºC and output voltage from 20.0 V to 55.0 V, unless otherwise noted. Boldfacespecifications apply over the temperature range of -55ºC < TINT < 125ºC. Share (Adaptive Loop and Slave Operation Only)

• Functions as SHARE pin in master slave array configuration
• Current share bus for array operation (master/slave scheme)
• Sources current and provides SHARE signal in master operation
• Sinks constant current when externally driven in active range (Slave Operation) Signal Type State Attribute Symbol Conditions / Notes Min Typ Max Unit SHARE Voltage VSHARE 0.79 7.40 V Standalone/ Active Range Analog Output Master SHARE Available ISHARE VSHARE > 0.79 V 2.5 mA Operation Current SHARE Resistance RSHARE 93.3 kΩ to SGND Slave SHARE Sink Current I SHARE_SINK VSHARE > 0.79 V 0.25 0.50 0.75 mAAnalog Input Operation REF_EN: Reference Enable (Remote Sense and Slave Operation Only)
• Functions as REF_EN pin in Remote Sense and Slave Operation
• REF_EN signals successful start up and powertrain ready to operate
• Intended to power and enable the external feedback circuit reference in Remote Sense Operation
• 3.25 V, 4 mA regulated voltage source Signal Type State Attribute Symbol Conditions / Notes Min Typ Max Unit REF_EN Voltage V REF_EN REF_EN unloaded 2.72 3.25 3.37 V REF_EN Source ROUT_REF_EN 50 100 Ω Impedance Normal REF_EN Current I REF_EN 4 mA Analog Output Operation REF_EN Capacitance C REF_EN_EXT 0.1 µF (External) REF_EN Voltage Ripple VREF_EN_PP Includes burst mode, 20 MHz BW 25 mV ENABLE to REF_EN tENABLE_REF_EN ENABLE low to REF_EN low 130 µs TransitionDelay VAUX to REF_EN tVAUX_REF_EN VAUX = 8.1 V to REF_EN high 1 ms Delay

Rev 1.1 vicorpower.comMIL-COTS PRMTM Regulator Page 16 of 44 09/2015 800 927.9474 M PRM48NH480M250A00 Control Node (Remote Sense Operation Only)

• Functions as CONTROL NODE pin in Remote Sense Operation
• Modulator control node voltage sets power train timing
• Driven by external error amplifier in Remote Sense Operation
• Sinks constant current when externally driven in active range
• Sources current, and clamps voltage to 0.79 V when pulled below active range Signal Type State Attribute Symbol Conditions / Notes Min Typ Max Unit CONTROL NODE VCN 0.79 7.40 V Voltage Active Range CONTROL NODE ICN_LOW VCN < 0.79 V 2.5 mA Analog Input Normal Source Current Operation CONTROL NODE ICN_SINK VCN > 0.79 V 0.25 0.50 0.75 mA Sink Current CONTROL NODE R CN 93.3 kΩResistance to SGND IFB: Current Feedback (Remote Sense Operation Only)
• Functions as IFB pin in Remote Sense Operation
• A voltage proportional to the PRM output current must be supplied externally to the IFB pin in order for the device to properly protect overcurrent events and to enable output current limit (clamp)
• Overcurrent protection trip will cause instantaneous powertrain disable, detected after tBLANK
• Not used for Adaptive Loop Operation Signal Type State Attribute Symbol Conditions / Notes Min Typ Max Unit Current Limit (Clamp) VIN = 48.0 V; VOUT = 48.0 V Threshold VIFB_IL TINT = 25°C 1.90 2.00 2.10 V Over line, trim, and temperature1.85 2.15 V Not production tested; guaranteed Analog Input Normal Overcurrent by design; TINT = 25°C 2.58 2.69 2.80 V Operation Protection VIFB_OC Not production tested; guaranteed Threshold by design; over line, trim, 2.56 2.82 V and temperature IFB Input Impedance R IFB 2.09 2.13 2.17 kΩ Current Limit BW IL 2.0 kHzBandwidth Signal Specifications (cont.) Specifications apply over all line and load conditions, TINT = 25ºC and output voltage from 20.0 V to 55.0 V, unless otherwise noted. Boldfacespecifications apply over the temperature range of -55ºC < TINT < 125ºC. NC: No Connect
• Reserved for factory use only
• No connections should be made to these pins

Rev 1.1 vicorpower.comMIL-COTS PRMTM Regulator Page 17 of 44 09/2015 800 927.9474 M PRM48NH480M250A00 Functional Block Diagram +OUT -OUT L COUT +IN -IN CIN SHARE/ CONTROL NODE 57.6 k Ω 35.7 k Ω 1000 pF EN ABLE TRIM 3.3 V 10 kΩ 1000 pF NC NC 10 k Ω 0.01 uF AL 60.4 VT 2200 pF VAUX 0.01 uF 2.1 30.1 W IFB 0.01 uF REF/ REF_EN 6800 pF OTP 0.5 mA 2.5 mA Min IN OUT PGND SGND 1.58 30.1 VCC SGN D VC PGNDSGND kΩ kΩ kΩ kΩ kΩ kΩ kΩ kΩ Current Limit Adaptive Loop Output Overvoltage ProtectionUndervoltage Lockout Overvoltage Lockout Output Short Circuit Control and Monitoring Error Amplifier Voltage Reference Modulator Enable Internal VCC Regulator 3.3 V Linear Regulator

Rev 1.1 vicorpower.comMIL-COTS PRMTM Regulator Page 18 of 44 09/2015 800 927.9474 M PRM48NH480M250A00 High Level Functional State Diagram Conditions that cause state transitions are shown along arrows. Sub-sequence activities listed inside the state bubbles. STARTUP SEQUENCE tON expired ENABLE: 1.8mA to HIGH VC Pulse REF_EN active Adaptive loop and trim modes latched RS mode latched at first ENABLE after Vin applied only Powertrain Active STANDBY SEQUENCE ENABLE: 10uA to LOW tOFF expired ENABLE: 90uA to HIGH Powertrain Stopped Application of Vin ENABLE rising edge ENABLE falling edge, Output OVP or OTP detected FAULT SEQUENCE ENABLE pulsed: 25mA to LOW Powertrain Stopped VIN > UVLO+ ENABLE falling edge, Output OVP, or OTP detected tSTARTUP_SEQ expired SUSTAINED OPERATION ENABLE: 1.8mA to HIGH Powertrain Active Input OVLO or UVLO, Output UVP, or UTP detected Short Circuit detected Input OVLO or UVLO, Output UVP, or UTP detected Fault Auto- recovery LINE DROP-OUT OPERATION Powertrain Active Derated Power and Current tDROPOUT timer enabled VIN < VIN_DROPOUT_EN- t < tDROPOUT and VIN > VIN_DROPOUT_DIS+ tDROPOUT expired or VIN ≤ VIN_UVLO-_SUPV

Rev 1.1 vicorpower.comMIL-COTS PRMTM Regulator Page 19 of 44 09/2015 800 927.9474 M PRM48NH480M250A00 Timing Diagrams (Adaptive Loop Operation) Module Inputs are shown in blue; Module Outputs are shown in brown. REF VOUT ENABLE SHARE +IN VC VAUX TRIM Iout VVC_START 3.3V 2.4V tVC tBLANK INPUT POWER ON AND UV TURN□ON AL ACTIVE INPUT OV INPUT OV RECOVERY ENABLE DISABLE ENABLE RELEASE FULL LOAD APPLIED OUTPUT OV tOFF tON tONtBLANK tBLANK tAUX_REF tPROT tPROT BIDIR BIDIR BIDIR OUTPUT OUTPUT OUTPUT OUTPUT INPUT INPUT AL VINIT tOFF 48V 55V 2.75V 1.0V 20V TRIM INACTIVE AL = 1V tENABLE_VC VIN_OVLO VIN_UVLO VSHARE_MAX VSHARE_MIN ILIMIT VENABLE VENABLE_EN VOUT_OVP+ VOUT_MAX VOUT_NOM VOUT_MIN VAUX tSTARTUP_SEQ AL = 1V INPUT VREF FirstEnb: TR not low = not RS mode TR high = trim inactive for this enabled period AL not high = AL active for this enabled period TR high = trim inactive for this enabled period AL not high = AL active for this enabled period TR high = trim inactive for this enabled period AL not high = AL active for this enabled period Soft Start TRIM Ignored Vout increases by VAL * GAL * I OUT TRIM and AL pins sampled Soft Start Micro□controller initialized Current sense activated, and output increase due to AL after tSTARTUP_SEQ expires

Rev 1.1 vicorpower.comMIL-COTS PRMTM Regulator Page 20 of 44 09/2015 800 927.9474 M PRM48NH480M250A00 REF VOUT ENABLE SHARE +IN VC VAUX TRIM Iout VIN_OVLO VENABLE_EN VENABLE VVC_START VAUX VSHARE_MIN ILIMIT VSHARE_MAX INPUT POWER ON AND UV TURN□ON OUTPUT SHORT CIRCUIT OUTPUT POWER LIMIT PROTECTION CURRENT LIMIT EVENT INPUT POWER OFF AND UV TURN□OFF tOFF tSC tBLANK 20V INPUT BIDIR BIDIR BIDIR OUTPUT OUTPUT OUTPUT OUTPUT INPUT INPUT 2.75V AL VINIT 1 V 3.3V 55V 2.4V 48V 1 V 2.4V 2.75V 3.3V OT SHUTDOWN AND RECOVERY ENABLE TOGGLING AL INACTIVE AND TRIM ACTIVE VOUT_MAX VOUT_MIN VOUT_NOM VIN_UVLO tSTARTUP_SEQ FirstEnb: TR not low = not RS mode TR not high = trim ac/g415ve for this enabled period AL high = AL inac/g415ve for this enabled period TR not high = trim ac/g415ve for this enabled period AL high = AL inac/g415ve for this enabled period TR high = trim inac/g415ve for this enabled period AL not high = AL ac/g415ve for this enabled period TR high = trim inac/g415ve for this enabled period AL not high = AL ac/g415ve for this enabled period tLIM_SUPV tSCR+tOFF tBLANK AL pin Ignored VOUT = VTRIM * 20 VOUT clamped to 55V for VTRIM > 2.75V AL ac/g415ve Vout increase due to Iout and AL a/g332er tSTARTUP_SEQ expires Opera/g415ng Mode Trim and AL state detected Micro□ controller ini/g415alized Timing Diagrams (Adaptive Loop Operation) (cont.) Module Inputs are shown in blue; Module Outputs are shown in brown.

Rev 1.1 vicorpower.comMIL-COTS PRMTM Regulator Page 21 of 44 09/2015 800 927.9474 M PRM48NH480M250A00 REF_EN VOUT ENABLE CONTROL NODE +IN VC VAUX TRIM IFB VENABLE_EN VENABLE VVC_START VCN_MAX VAUX VREF_EN tVC VIFB_OC tBLANK INPUT POWER ON AND UV TURN□ON t < tBLANK QUICK OC (t<tBLNK) INPUT OV VIFB_IL INPUT OV RECOVERY ENABLE DISABLE ENABLE RELEASE FULL LOAD APPLIED LOAD RELEASE AND OUTPUT OV (SLOW F/B) tOFF tON tONtBLANK tBLANK tENABLE_REF_ENtAUX_REF_EN tPROT tPROT tENABLE_REF_EN VCN_MIN VIN_OVLO VIN_UVLO VOUT_OVP+ VINIT tENABLE_REF_EN This blue shaded region is where trim voltage is a don’t care. RS opera/g415ng mode is latched. TRIM is ignored un/g415l Vin is removed. First Enable: Trim Low = RS mode RS mode detected and latched TRIM ignored for all subsequent start up events un/g415l VIN is removed Micro□controller ini/g415alized Timing Diagrams (Remote Sense Operation) Module Inputs are shown in blue; Module Outputs are shown in brown.

Rev 1.1 vicorpower.comMIL-COTS PRMTM Regulator Page 22 of 44 09/2015 800 927.9474 M PRM48NH480M250A00 REF_EN VOUT ENABLE CONTROL NODE +IN VC VAUX TRIM IFB START UP WITH MINIMUM < dVIN/dt < 1.2V/ms OUTPUT SHORT CIRCUIT OUTPUT POWER LIMIT PROTECTION CURRENT LIMIT EVENT INPUT UV tOFF tSC <tBLANK tBLANKVCN_MAX VCN_MIN VIFB_OC VIFB_IL VENABLE VENABLE_EN VVC_START VREF_EN VAUX VIN_OVLO VIN_UVLO VINIT VOUT_OVP+ This blue shaded region is where trim voltage is a don’t care. RS opera/g415ng mode is latched. TRIM is ignored un/g415l Vin is removed. First Enable: Trim Low = RS mode RS mode detected and latched TRIM ignored for all subsequent start up events un/g415l VIN is removed tSCR+tOFF Micro□controller ini/g415alized Timing Diagrams (Remote Sense Operation) (cont.) Module Inputs are shown in blue; Module Outputs are shown in brown.

Rev 1.1 vicorpower.comMIL-COTS PRMTM Regulator Page 27 of 44 09/2015 800 927.9474 M PRM48NH480M250A00 General Characteristics Specifications apply over all line and load conditions, TINT = 25ºC and output voltage from 20.0 V to 55.0 V, unless otherwise noted. Boldface specifications apply over the temperature range of -55ºC < TINT < 125ºC. Attribute Symbol Conditions / Notes Min Typ Max Unit Mechanical Length L 21.8 22.0 22.3 mm Width W 16.3 16.5 16.8 mm Height H 6.48 6.73 6.98 mm Volume Vol No Heatsink 2.44 cm3 (0.15) in3 Weight W 7 g Nickel 0.51 2.03 Lead Finish Palladium 0.02 0.15 µm Gold 0.003 0.050 Thermal Operating Internal Temperature TINT M Grade -55 125 ºC Thermal Impedance θINT-CASE 2 ºC/W θINT-LEAD 9 ºC/W Thermal Capacity 5 Ws / ºC Assembly Peak Compressive Force Supported by J-Lead only 3 lbs Applied to Case (Z-axis) 5.3 lbs / in2 Storage Temperature TST M Grade -65 125 ºC ESD Rating HBM Method per Human Body Model Test CLASS 1C ESDA/JEDEC JDS-001-2012 V CDM Charged Device Model JESD22-C101E CLASS 2 Soldering Peak Temperature During Reflow MSL 4 (Datecode 1528 and later) 245 ºC Maximum Time Above 217 ºC 60 90 s Peak Heating Rate During Reflow 1.5 2.0 ºC / s Peak Cooling Rate Post Reflow 2.5 3.0 ºC / s Reliability Telcordia Issue 2 - Method I Case 1; Ground Benign, 5.28 MHrs MTBF Controlled MIL-HDBK-217 Plus Parts Count - 25C Ground Benign, 5.29 MHrs Stationary, Indoors / Computer Profile Agency Approvals Agency Approvals / Standards EN 60950-1 CE Marked for Low Voltage Directive and RoHS Recast Directive, as applicable

Rev 1.1 vicorpower.comMIL-COTS PRMTM Regulator Page 28 of 44 09/2015 800 927.9474 M PRM48NH480M250A00 Pin Functions +IN, -IN Input power pins +OUT, -OUT Output power pins. Module cannot sink current. ENABLE This pin turns the supply on and off. The pin is both an input and an output and can provide the following features: n Delayed Start: upon application of voltage (>UVLO) to the module power input and after t off, the ENABLE pin will source a constant 90μA current. n Output enable: When ENABLE is allowed to pull up above the enable threshold, the ENABLE pin will pull up to 5V with 1.8mA source capability, and the module will be enabled. n Output disable: ENABLE may be pulled down externally in order to disable the module. Pull down resistance should be less than 235Ω to SGND. n Fault detection flag: The ENABLE 5V voltage source is internally turned off when a fault condition is detected . ENABLE control should be implemented using an open collector configuration. It is not recommended to drive this pin externally. VAUX: Auxiliary Voltage Source Use this pin to power external devices with a non-isolated 9V supply, with up to 5mA load capability, switched with ENABLE input. Do not place a capacitor over 0.04µF on this pin. SGND: Signal Ground This is a low current pin which provides a Kelvin connection to the PRMs internal signal ground. Use this pin as the ground reference for external circuitry and signals to avoid voltage drops caused by high currents on power returns. In array configurations, SGND pins should be star connected at a single point. A series resistor (~1Ω) to the star location is recommended to decouple return currents. VC: VTM Control This output pin is used to temporarily provide VCC voltage to connected VTMs during start up. The pulse is nominally 14V, 10ms wide. A VTM can self-power once its input voltage reaches its minimum specified input voltage. The PRM output must be checked to make sure it reaches this threshold voltage before the VC pulse expires. TRIM The TRIM pin is used to select the operating mode and to trim the PRM output when Adaptive Loop operating mode is selected. The TRIM pin has an internal pull-up to V CC_INT through a 10kΩ resistor. Operating Mode Select: If TRIM is pulled below 0.45V during the first startup after VIN is applied, Remote Sense / Slave operation is selected. Otherwise, Adaptive Loop operation is selected. This selection persists until V INis removed from the part, and is not changed by fault or disable events. Output Voltage Trim: Sets the output voltage of the PRM in Adaptive Loop operation. If TRIM is permitted to pull up to 3.20V or higher during start up, trim is disabled, and the output is set to the nominal of 48.0V. If TRIM is held between 1.00V to 2.75V during start up, trim is enabled, and the output is scaled by a factor of 20resulting in an output voltage range of 20.0V to 55.0V. This selection persists until the PRM is restarted with the ENABLE pin, or due to fault auto-recovery. AL: Adaptive Loop (Adaptive Loop Operation) This input pin allows you to set the Adaptive Loop load line. Every volt on this pin represents 1.0Ω of positive output slope. There is an internal 10kΩ pullup resistor to V CC_INT. If AL is permitted to pull up to 3.20V or higher during start up, the Adaptive Loop load line is disabled. This selection persists until the PRM is restarted with the ENABLE pin, or due to fault auto-recovery. VT: VTM Temperature (Adaptive Loop Operation) This pin is used in the Adaptive Loop compensation algorithm to account for the VTM output resistance variation as a function of temperature. The VTM TM pin provides this voltage, scaled as the temperature in K (Kelvin) divided by 100, so 25°C is 2.98V. Leave disconnected or pull below 1.9V to disable. The adjustment is fixed at 0.3%/°C relative to the value at 25°C REF: Reference (Adaptive Loop Operation) This output pin allows you to monitor the internal reference voltage in Adaptive Loop Operation. During normal operation it represents the output voltage scaled by a factor of 20. In Adaptive Loop Operation this pin is for monitoring purposes only and should not be driven or loaded externally. REF_EN: Reference Enable (Remote Sense Operation) In Remote Sense Operation this pin outputs a regulated 3.25V, 4mA voltage source. It is enabled only after successful start up of the PRM powertrain. REF_EN is intended to power the output current transducer and also the voltage reference for the external control loop. Powering the reference generator with REF_EN helps provide a controlled start up, since the output voltage of the system is able to track the reference level as it comes up. SHARE (Adaptive Loop and Slave Operation) This bus sets the output current level for all the PRM modules when operating in an array (master-slave configuration). Connect them together among the modules in the shared bus. One PRM should be configured as a master by connecting TRIM for Adaptive Loop Operation. All other PRMs should be configured as slaves by pulling their respective TRIM pins low. This pin can be used to monitor the error voltage externally. 0 to 100% load is represented by a voltage between 0.79V and 7.40V. CONTROL NODE (Remote Sense Operation) In Remote Sense Operation, this is the input to the modulator which determines the powertrain timing and ultimately the module output power. An internal 0.5mA current sink is always active. The bi- directional buffer between CONTROL NODE and the modulator has two states. In normal operation, CONTROL NODE will be above the 0.79V switching threshold, and will drive the modulator through the buffer. An internal 7.40V clamp determines the maximum output power that can be requested of the modulator.

Rev 1.1 vicorpower.comMIL-COTS PRMTM Regulator Page 29 of 44 09/2015 800 927.9474 M PRM48NH480M250A00 When CONTROL NODE falls below 0.79V, the converter will stop switching. An internal circuit clamps the modulator input to 7.40V, and a buffer will source up to 2.5mA out of the pin at that clamp level. For this reason, the output impedance of the amplifier driving CONTROL NODE must be taken into account. A rail-to-rail operational amplifier with low output impedance is always recommended. The powertrain small signal (plant) response consists of a single pole determined by the load resistance, the powertrain equivalent output resistance, and the total output capacitance (internal and external to the module). Both the modulator gain and the equivalent output resistance vary as a function of line, load and output voltage. As the load increases, the powertrain pole moves to higher frequency. As a result, the closed loop crossover frequency will be the highest at full load and lowest at minimum load. Figure 24 shows a reference AC small-signal model. IFB: Current Feedback (Remote Sense Operation) In Remote Sense Operation, IFB is the input for the module output overcurrent protection and current limit features. A voltage proportional to the powertrain output current must be applied to IFB in order for overcurrent protection to operate properly. If the IFB voltage exceeds the IFB pin’s overcurrent protection threshold, the powertrain will stop switching. If the IFB voltage falls below the overcurrent protection threshold within t BLANKtime, then the powertrain will immediately resume switching. Otherwise a fault is detected. The current limit threshold for the IFB pin is set lower than the protection threshold. When the IFB pin average voltage exceeds the current limit threshold, an internal integrator will activate a clamp amplifier which overrides the modulator input maximum level. This causes the powertrain to maintain a constant output current. The bandwidth of this current limit integrator is significantly slower than that of the CONTROL NODE input. Therefore this current limit cannot be used in lieu of properly compensating the (external) control loop to avoid exceeding maximum current or power ratings for the device. Design Guidelines The MPRM48NH480M250A00regulator is specifically designed to provide a controlled Factorized Bus distribution voltage for powering downstream VTM Transformer — fast, efficient, isolated, low noise Point-of-Load (POL) converters. The MPRM48NH480M250A00can be configured for two operating modes depending on the type of regulation required. In Adaptive Loop Operation the regulation circuitry is enabled within the device and regulates the voltage at the output terminals. The M PRM48NH480M250A00has a programmable Adaptive Loop load line which can be used to compensate for downstream VTM output resistance allowing for precise point of load regulation without the need for remote sensing. In Remote Sense Operation, the internal regulation circuitry is disabled and the voltage regulation circuitry is provided externally allowing for remote sensing directly at the point of load. In certain applications Remote Sense Operation can improve regulation accuracy, and allow for operating with high amounts of load capacitance and optimizing load transient response. Operating Mode Selection The operating mode is selected through use of the TRIM pin. When the part is first enabled after V INis applied, the TRIM voltage is sampled. The TRIM pin has an internal pull up resistor to VCC_INT, so unless external circuitry pulls the pin voltage lower, it will float up to V CC_INT. If TRIM is pulled lower than 0.45V during the first startup after V INis applied, the part will be configured for Remote Sense / Slave Operation, where the internal voltage regulation circuitry is disabled. In this case, for all subsequent operation the part will output a voltage dependent on the SHARE / CONTROL NODE voltage provided externally (either from an external regulation circuit or master PRM). To configure the part for Remote Sense or Slave Operation, connect the TRIM pin to SGND. It is recommended to make this connection through a 0 Ω jumper for troubleshooting purposes. If the sampled TRIM voltage is higher than 0.55V during the first startup after V INis applied, then the part will be configured for Adaptive Loop Operation, and the internal voltage regulation circuitry is enabled. The PRM will output a voltage dependent on the TRIM voltage, and will remain in this mode for as long as V INis applied. To configure the part for Adaptive Loop Operation, leave the TRIM pin disconnected, or apply a voltage/resistance within the specified range. The operating mode is detected and detected during the first start up after V INis applied. This selection persists until VINis removed from the part, and is not changed by fault or disable events. Changing the operating mode can only be done by removing V IN. VCN · G CN COUT_INT VCN ICN_LOW RCN rEQ_OUT rEQ_IN VIN CIN_INT CONTROL NODE Output Figure 24 — MPRM48NH480M250A00 AC small signal model

Rev 1.1 vicorpower.comMIL-COTS PRMTM Regulator Page 34 of 44 09/2015 800 927.9474 M PRM48NH480M250A00 Arrays (Adaptive Loop Operation) In Adaptive Loop operation a master-slave configuration is used for arrays. Up to 5PRMs of the same type may be placed in parallel to expand the power capacity of the system. One PRM is designated as the master and contains the active control loop which considers control pin inputs and drives SHARE. The other PRMs listen to SHARE and act as slave powertrains only. The following high-level guidelines must be followed in order for the resultant system to start up and operate properly, and to avoid overstress or exceeding any absolute maximum ratings. n One PRM must be designated as a master through configuring the TRIM pin voltage within the recommended range. n All other PRMs must be designated as slave PRMs by tying TRIM pins to SGND. It is recommended to make this connection through a 0 Ω jumper for troubleshooting purposes. n All PRMs in the array must be powered from a common power source so that the input voltage to each PRM is the same. The IN pins of all PRMs must be connected together. n An independent fuse for each PRM +IN connection is required to maintain safety certifications (see Fusing section). n An independent inductor for each PRM +IN connection is recommended when used in an array, to control circulating currents among the PRM inputs and reduce the impact of beat frequencies. n Mismatches in both inductance, and resistance from the common power source to each PRM should be minimized. n ENABLE pins must be connected together for start up synchronization and proper fault response of the array. n SHARE pins must be connected together to enable sharing. The bandwidth requirements of SHARE are low enough that the bus can be considered a lumped element, rather than a transmission line, and so star connections to the master PRM with stubs, as well as daisy chain connections are permitted. n The resistances between slave unit SHARE pins and the master’s should be well matched, to avoid introducing additional sharing mismatches. The SHARE bus should not be routed under any PRM. SHARE bus parasitic capacitance to +IN or +OUT should be minimized. n SGND of the master PRM is the reference for all control loop functions. The SGND pins of each slave PRMs should be connected to the SGND reference node on the board through a 1Ω resistor. n When operating within an array, the master PRM is rated for full power while the slave PRMs are de-rated to the array rated power and current values provided for Slave Operation OUT_ARRAY,IOUT_ARRAY). The number of PRMs required to achieve a given array capacity must consider these de-ratings to avoid overstressing any PRM in the array. n Adaptive Loop design procedures above will hold for an array, in general, although some parameters must be scaled against the number of PRMs in the system. Arrays of more than 5PRMs may be possible through use of external circuitry. Please contact Vicor Applications for assistance with array sizing above 5units. PRM 2 SLAVE ENABLE TRIM SHARE/ CONTROL NODE AL IFB VT VC VAUX REF/ REF_EN +IN –IN +OUT –OUT SGND 2 SGND SGND 2 SGND 1 GND LIN 2 PRM 1 MASTER ENABLE TRIM SHARE/ CONTROL NODE AL IFB VT VC VAUX REF/ REF_EN +IN –IN +OUT –OUT SGND 1 SGND GND LIN 1 GND CIN VIN LF 2 LF 1 CF 1 VC TM PC VOUT +IN –IN –OUT +OUT Adaptive Loop Temperature Feedback VTM Start Up Pulse ISOLATION BOUNDRY SEC_GND VTM 1 PRIMARY SECONDARY COUTSGND 1 RTRIM RAL VC TM PC +IN –IN –OUT +OUT ISOLATION BOUNDRY VTM 2 PRIMARY SECONDARY CF 2 VTM Start Up Pulse SEC_GND VF: 20 V to 55 V ENABLE Bus SHARE Bus Figure 36 — Adaptive Loop Array Example

Rev 1.1 vicorpower.comMIL-COTS PRMTM Regulator Page 35 of 44 09/2015 800 927.9474 M PRM48NH480M250A00 Design Guidelines (Remote Sense Operation) In Remote Sense Operation, the MPRM48NH480M250A00is an intelligent powertrain module designed to fully exploit external output voltage feedback and current sensing sub-circuits. These two external circuits are illustrated in Figure 37, which shows an example of the PRM in a standalone application with local voltage feedback and high side current sensing. In general, these circuits include a precision voltage reference, an operational amplifier which provides closed loop feedback compensation, and a high side current sense circuit which includes a shunt and current sense IC. The following design procedures refer to the circuit shown in Figure 37. Setting the Output Voltage Level (Remote Sense Operation) The output voltage setpoint is a function of the voltage reference and the output voltage sense ratio. With reference to Figure 37, R1 and R2 form the output voltage sensing divider which provides the scaled output voltage to the negative input of the error amplifier; a dedicated reference IC provides the reference voltage to the positive input of the error amplifier. Under normal operation, the error amplifier will keep the voltages at the inverting and non-inverting inputs equal, and therefore the output voltage is defined by: (5) Note that the component R1 will also factor into the compensation as described in a later section. It is important to apply proper slew rate to the reference voltage rise when the control loop is initially enabled. The recommended range for reference rise time is 1 ms to 9 ms. The lower rise time limit will ensure optimized modulator timing performance during start up, and to allow the current limit feature (through IFB pin) to fully protect the device during power-up. The upper rise time limit is needed to guarantee a sufficient factorized bus voltage is provided to any downstream VTM input before the end of the VC pulse. Setting the Output Current Limit and Overcurrent Protection Level (Remote Sense Operation) In Remote Sense Operation, the internal current sensing is disabled, and an external current sense amplifier must be implemented to provide feedback to the IFB pin. The current limit and overcurrent protection set points are linked, and scale together against the current sense shunt, and the gain of the current sense amplifier. The output of the current sense IC provides the IFB voltage which has V IFB_ILand VIFB_OCthresholds for the two functions respectively. The set points are therefore defined by: (6) and (7) where G CSis the gain of the current sense amplifier. 2 1 R R RV VREFOUT u CSS ILIFB IL G R VI u CSS OCIFB OC G R VI u PRM ENABLE TRIM SHARE/ CONTROL NODE AL IFB VC VT VAUX REF/ REF_EN +IN –IN +OUT –OUT SGND GND SGND ON/OFF CONTROL SGND CIN COUT VIN Voltage Sense and Error Amplifier (Single Ended) SGND V + VOUT –IN+IN V – SGND External Current Sense and Feedback VOUT RS Voltage Reference with Soft Start SGND IN OUT GND RSS CSS 10 k SGND VREF VREF REF 3312 Figure 37 — Remote Sense Example

Rev 1.1 vicorpower.comMIL-COTS PRMTM Regulator Page 36 of 44 09/2015 800 927.9474 M PRM48NH480M250A00 Control Loop Compensation Requirements (Remote Sense Operation) In order to properly compensate the control loop, all components which contribute to the closed loop frequency response should be identified and understood. Figure 24 shows the AC small signal model for the module. Modulator DC gain G CNand powertrain equivalent resistance rEQ_OUTare shown. These modeling parameters will support a design cut-off frequency up to 50kHz. Standard Bode analysis should be used for calculating the error amplifier compensation and analyzing the closed loop stability. The recommended stability criteria are as follows: 1) Phase Margin > 45º: for the closed loop response, the phase should be greater than 45º where the gain crosses 0 dB. 2) Gain Margin > 10dB : The closed loop gain should be lower than - 10dB where the phase crosses 0º. 3) Gain Slope = -20dB/decade : The closed loop gain should have a slope of -20dB/decade at the crossover frequency. The compensation characteristics must be selected to meet these stability criteria. Refer to Figure 37 for a local sense, voltage-mode control example based on the configuration in Figure 36. In this example, it is assumed that the maximum crossover frequency CMAX) has been selected to occur between B and C. Type-2 compensation (Curve IJKL) is sufficient in this case. The following data must be gathered in order to proceed: n Modulator Gain GCN: See Figures 18, 19, 20 n Powertrain equivalent resistance rEQ: See Figures 18, 19, 20 n Internal output capacitance: see Figure 13 n External output capacitance value In the case of ceramic capacitors, the ESR can be considered low enough to push the associated zero well above the frequency of interest. Applications with high ESR capacitor may require a different type of compensation, or cascade control. The system poles and zeros of the closed loop can then be defined as follows: n Powertrain pole, assuming the external capacitor ESR can be neglected: n Main pole frequency: n Compensation Mid-Band Gain: (8) n Compensation Zero: (9) n Compensation Pole: and for FP2>>FZ1(C1+ C2≈ C1): (10) 2 1 2 1 3 C C C C RP u uu 2 3 1F C R P u u5 / LOADOUTEQ LOADOUTEQ C R r R rR EXTOUT u EXTOUTINTOUT LOADOUTEQ LOADOUTEQ P CR r R r Cʌ2 u uu MB R Rlog20 G 1 3 1 Z C Rʌ2 1F u u Open Loop Gain vs. Frequency -40 -20 Frequency, Log scale (y-intercept is application specific) Gain (dB) PRM Open Loop Max Load A B E F I J K L Compensation Gain C G FCMAXFCMIN E FF PRM Open Loop Min Load Application’s op-amo GBW Figure 38— Reference asymptotic Bode plot for the considered system

Rev 1.1 vicorpower.comMIL-COTS PRMTM Regulator Page 37 of 44 09/2015 800 927.9474 M PRM48NH480M250A00 Midband Gain Design: R1, R3 (Remote Sense Operation) With reference to Figure 37: curve ABC is the: n minimum output voltage in the application n maximum input voltage expected in the application n maximum load PRM open loop response, and is where the maximum crossover frequency occurs. In order for the maximum crossover frequency to occur at the design choice F CMAX, the compensation gain must be equal and opposite of the powertrain gain at this frequency. For stability purposes, the compensation should be in the Mid-band (J-K) at the crossover. Using Equation (8), the mid-band gain can be selected appropriately. Compensation Zero Design :C1 (Remote Sense Operation) With reference to Figure 37: curve EFG is the: n maximum output voltage in the application n minimum input voltage expected in the application n minimum load in the application PRM open loop response, and is where the minimum crossover frequency F CMINoccurs. Based on stability criteria, the compensation must be in the mid-band at the minimum crossover frequency, therefore F CMINwill occur where EFG is equal and opposite of GMB. C1 can be selected using Equation (9)so that FZ1occurs prior to FCMIN. High Frequency Pole Design: C2 (Remote Sense Operation): Using Equation (10), C2 should be selected so that F P2is at least one decade above FCMAXand prior to the gain bandwidth product of the operational amplifier (10MHz for this example). For applications with a higher desired crossover frequency the use of a high gain bandwidth product amplifier may be necessary to ensure that the real pole can be set at least one decade above the maximum crossover frequency.

Rev 1.1 vicorpower.comMIL-COTS PRMTM Regulator Page 38 of 44 09/2015 800 927.9474 M PRM48NH480M250A00 Arrays (Remote Sense Operation) In Remote Sense Operation up to 10PRMs of the same type may be placed in parallel to expand the power capacity of the system. All PRMs within the array are configured for Remote Sense Operation and are driven by an external control circuit which considers the control inputs and drives the CONTROL NODE bus. The following high-level guidelines must be followed in order for the resultant system to start up and operate properly, and to avoid overstress or exceeding any absolute maximum ratings. n All PRMs must be configured for Remote Sense Operation by tying TRIM pins to SGND. It is recommended to make this connection through a 0 Ω jumper for troubleshooting purposes. n All PRMs in the array must be powered from a common power source so that the input voltage to each PRM is the same. n An independent fuse for each PRM +IN connection is required to maintain safety certifications (see Fusing section). n An independent inductor for each PRM +IN connection is recommended when used in an array, to control circulating currents among the PRM inputs and reduce the impact of beat frequencies. n Mismatches in both inductance, and resistance from the common power source to each PRM should be minimized. n ENABLE pins must be connected together for start up synchronization and proper fault response of the array. n Reference supply to the control loop voltage reference and current sense circuitry must be enabled when all modules’ R EF_EN pins have reached their operational voltage levels. n A single external control circuit must be implemented as described in the Remote Sense Operation design guidelines. The control circuit should drive the CONTROL NODE bus. n CONTROL NODE pins must be connected together to enable sharing. The bandwidth requirements of CONTROL NODE are low enough that the bus can be considered a lumped element, rather than a transmission line, and so star connections as well as daisy chain connections are permitted. n Each PRM must have its own local current shunt and current sense circuitry to drive its IFB pin. n The resistances between CONTROL NODE pins should be well matched, to avoid introducing additional sharing mismatches. The CONTROL NODE bus should not be routed under any PRM. Parasitic capacitance to +IN or +OUT should be minimized. n One PRM should be designated to provide the SGND reference, VAUX, and REF_EN voltages for the external circuitry. n The SGND pins of each PRM should be connected to the SGND reference node on the board through a 1Ω resistor. n When operating within an array, the PRMs are de-rated to the array rated power and current values provided for Remote Sense Operation (P OUT_ARRAY, IOUT_ARRAY). The number of PRMs required to achieve a given array capacity must consider these de-ratings to avoid overstressing any PRM in the array. n When using VAUX to power external circuitry, total current draw including CONTROL NODE sink currents must be taken into account to ensure the maximum VAUX current is not exceeded. Arrays of more than 5 PRMs may require additional circuitry to provide the required source current. Contact Vicor Applications Engineering for more information. PRM 2 ENABLE TRIM SHARE/ CONTROL NODE AL IFB VT VC VAUX REF/ REF_EN +IN –IN +OUT –OUT SGND 2 SGND SGND 2 SGND 1 LIN 2 PRM 1 ENABLE TRIM SHARE/ CONTROL NODE AL IFB VT VC VAUX REF/ REF_EN +IN –IN +OUT –OUT SGND 1 SGND LIN 1 CIN VIN LF 2 LF 1 CF 1 VC TM PC +IN –IN –OUT +OUT VTM Start Up Pulse ISOLATION BOUNDRY VTM 1 PRIMARY SECONDARY VC TM PC +IN –IN –OUT +OUT ISOLATION BOUNDRY VTM 2 PRIMARY SECONDARY CF 2 VTM Start Up Pulse SGND 1 VREF SGND 1 Voltage Sense SGND 1 SGND 1 IN OUT GND SGND V + VOUT –IN+IN V – SGND V + VOUT –IN+IN V – COUT LOAD RSS CSS 10 k GNDGND GND GND GND CONTROL NODE Bus ENABLE Bus [1] [1][1] [1] [1] Figure 39 — Non-Isolated Remote Sense Array Example [1]Non-Isolated Configuration: –Out connected to -IN

Rev 1.1 vicorpower.comMIL-COTS PRMTM Regulator Page 40 of 44 09/2015 800 927.9474 M PRM48NH480M250A00 Input Filter Stability The PRM can provide very high dynamic transients. It is therefore very important to verify that the voltage supply source as well as the interconnecting lines are stable and do not oscillate. For this purpose, the converter dynamic input impedance magnitude is provided in Figures 21, 22, 23. It is recommended to provide adequate design margin with respect to the stability conditions illustrated in the previous sections. Inductive source and local, external input decoupling capacitance with negligible ESR (i.e.: ceramic type) The voltage source impedance can be modeled as a series R LINELLINE circuit. The high performance ceramic decoupling capacitors will not significantly damp the network because of their low ESR; therefore in order to guarantee stability the following conditions must be verified: (13) (14) It is critical that the line source impedance be at least an octave lower than the converter’s dynamic input resistance, 14. However, R LINEcannot be made arbitrarily low otherwise equation 13is violated and the system will show instability, due to under-damped RLC input network. Inductive source and local, external input decoupling capacitance with significant R CIN_EXT ESR (i.e.: electrolytic type) In order to simplify the analysis in this case, the voltage source impedance can be modeled as a simple inductor L line. Notice that the high performance ceramic capacitors CIN_INTwithin the PRM, should be included in the external electrolytic capacitance value for this purpose. The stability criteria will be: (15) (16) Equation 16shows that if the aggregate ESR is too small – for example by using very high quality input capacitors (C IN_EXT) – the system will be under-damped and may even become destabilized. Again, an octave of design margin in satisfying 15should be considered the minimum. Layout Considerations Application Note AN:005 details board layout recommendations using VI Chip® components, with details on good power connections, reducing EMI, and shielding of control signals and techniques to reference them to SGND. Avoid routing control signals (ENABLE, TRIM, AL etc.) directly underneath the PRM. It is critical that all control signals (aside from VC and VT) are referenced to SGND, both for routing and for pull- down and bypassing purposes. VC and VT provide control and feedback from a VTM, and must be referenced to –OUT of the PRM (-IN of the VTM). SGND is connected to –IN internally to the PRM. SGND should not be tied to any other ground in the system. Input Fuse Recommendations A fuse should be incorporated at the input to each PRM, in series with the +IN pin. A 10A or smaller input fuse (Littelfuse® NANO2® 451/453Series) is required to safety agency conditions of acceptability. Always ascertain and observe the safety, regulatory, or other agency specifications that apply to your specific application. Thermal Considerations VIChip products are multi-chip modules whose temperature distribution varies greatly for each part number as well as with the input / output conditions, thermal management and environmental conditions. Maintaining the top of the MPRM48NH480M250A00case to less than 100ºC will keep all junctions within the VI Chip module below 125ºC for most applications. The percent of total heat dissipated through the top surface versus through the J-lead is entirely dependent on the particular mechanical and thermal environment. The heat dissipated through the top surface is typically 60%. The heat dissipated through the J-lead onto the PCB board surface is typically 40%. Use 100% top surface dissipation when designing for a conservative cooling solution. It is not recommended to use a VI Chip module for an extended period of time at full load without proper heat sinking. INEQEXTININTIN line line r C C LR ___ )( u IN EQlin e r R_ INEQr _ EX TINC IN EQR r INEQ CEXTIN line rR C L EXTIN _ _ u

Rev 1.1 vicorpower.comMIL-COTS PRMTM Regulator Page 42 of 44 09/2015 800 927.9474 M PRM48NH480M250A00 Product Outline Drawing and Recommended Land Pattern - SMD (F)

Rev 1.1 vicorpower.comMIL-COTS PRMTM Regulator Page 43 of 44 09/2015 800 927.9474 M PRM48NH480M250A00

Revision History

Revision Date Description Page Number(s) 1.0 06/20/14 Intital release n/a 1.1 09/30/15 Updated MSL Rating 27

Rev 1.1 vicorpower.comMIL-COTS PRMTM Regulator Page 44 of 44 09/2015 800 927.9474 M PRM48NH480M250A00 Vicor’s comprehensive line of power solutions includes high density AC-DC and DC-DC modules and accessory components, fully configurable AC-DC and DC-DC power supplies, and complete custom power systems. Information furnished by Vicor is believed to be accurate and reliable. However, no responsibility is assumed by Vicor for its use. Vicor makes no representations or warranties with respect to the accuracy or completeness of the contents of this publication. Vicor reserves the right to make changes to any products, specifications, and product descriptions at any time without notice. Information published by Vicor has been checked and is believed to be accurate at the time it was printed; however, Vicor assumes no responsibility for inaccuracies. Testing and other quality controls are used to the extent Vicor deems necessary to support Vicor’s product warranty. Except where mandated by government requirements, testing of all parameters of each product is not necessarily performed. Specifications are subject to change without notice. Vicor’s Standard Terms and Conditions All sales are subject to Vicor’s Standard Terms and Conditions of Sale, which are available on Vicor’s webpage or upon request. Product Warranty In Vicor’s standard terms and conditions of sale, Vicor warrants that its products are free from non-conformity to its Standard Specifications (the “Express Limited Warranty”). This warranty is extended only to the original Buyer for the period expiring two (2) years after the date of shipment and is not transferable. UNLESS OTHERWISE EXPRESSLY STATED IN A WRITTEN SALES AGREEMENT SIGNED BY A DULY AUTHORIZED VICOR SIGNATORY, VICOR DISCLAIMS ALL REPRESENTATIONS, LIABILITIES, AND WARRANTIES OF ANY KIND (WHETHER ARISING BY IMPLICATION OR BY OPERATION OF LAW) WITH RESPECT TO THE PRODUCTS, INCLUDING, WITHOUT LIMITATION, ANY WARRANTIES OR REPRESENTATIONS AS TO MERCHANTABILITY, FITNESS FOR PARTICULAR PURPOSE, INFRINGEMENT OF ANY PATENT, COPYRIGHT, OR OTHER INTELLECTUAL PROPERTY RIGHT, OR ANY OTHER MATTER. This warranty does not extend to products subjected to misuse, accident, or improper application, maintenance, or storage. Vicor shall not be liable for collateral or consequential damage. Vicor disclaims any and all liability arising out of the application or use of any product or circuit and assumes no liability for applications assistance or buyer product design. Buyers are responsible for their products and applications using Vicor products and components. Prior to using or distributing any products that include Vicor components, buyers should provide adequate design, testing and operating safeguards. Vicor will repair or replace defective products in accordance with its own best judgment. For service under this warranty, the buyer must contact Vicor to obtain a Return Material Authorization (RMA) number and shipping instructions. Products returned without prior authorization will be returned to the buyer. The buyer will pay all charges incurred in returning the product to the factory. Vicor will pay all reshipment charges if the product was defective within the terms of this warranty. Life Support Policy VICOR’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS PRIOR WRITTEN APPROVAL OF THE CHIEF EXECUTIVE OFFICER AND GENERAL COUNSEL OF VICOR CORPORATION. As used herein, life support devices or systems are devices which (a) are intended for surgical implant into the body, or (b) support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the labeling can be reasonably expected to result in a significant injury to the user. A critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system or to affect its safety or effectiveness. Per Vicor Terms and Conditions of Sale, the user of Vicor products and components in life support applications assumes all risks of such use and indemnifies Vicor against all liability and damages. Intellectual Property Notice Vicor and its subsidiaries own Intellectual Property (including issued U.S. and Foreign Patents and pending patent applications) relating to the products described in this data sheet. No license, whether express, implied, or arising by estoppel or otherwise, to any intellectual property rights is granted by this document. Interested parties should contact Vicor's Intellectual Property Department. The products described on this data sheet are protected by the following U.S. Patents Numbers: 7,368,957; RE40,072; D496,906; D506,438; D509,472; and for use under 6,975,098 and 6,984,965. Vicor Corporation

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