SLDN-03D1A0

Bel Fuse Inc.

3 VDC ??14.4 VDC Input,

Manufacturer: Bel Fuse Inc.

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The SLDN-03D1Ax modules are non-isolated dc-dc converters that can deliver up to 3A of output current. These modules operate over a wide range of input voltage (Vin = 3 - 14.4 VDC) and provide a precisely regulated output voltage from 0.45 VDC to 5.5 VDC, programmable via an external resistor and Power Management Bus control. Features include a digit al interface using the Power Management Bus protocol, remote On/Off, adjustable output voltage, over current and overtemperature protection. The Power Management Bus interface supports a range of commands to both control and monitor the module. The module also includes the Tunable Lo opTM feature that allows the user to optimize the dynamic response of the converter to match the load with reduced amount of output capacitance leading to savings on cost and PWB area.

3 VDC – 14.4 VDC Input,
0.45 VDC - 5.5 VDC /3 A Output (programmable from 0.6 to 5.5 VDC via external resistor)
Power Good signal
Remote On/Off
Over temperature protection
Ability to sink and source current
DOSA based
Digital interface through the Power Management Bus protocol
Tunable LoopTM to op timize dynamic output voltage response
Flexible output voltage sequencing EZ-SEQUENCE
Fixed switching frequency with capability of external synchronization
Output overcurrent protection (non-latching)
Wide operating temperature range [-40°C to 85°C]
UL60950-1 Recognized (UL/cUL)
ISO 9001 and ISO 14001 certified manufacturing facilities
Compliant to IPC-9592 (September 2008), Category 2, Class II
Compliant to RoHS EU Directive 2002/95/EC
Compatible in a Pb-free or SnPb reflow environment
Distributed power architectures
Servers and storage applications
Intermediate bus voltage applications
Networking equipment
Telecommunications equipment
Industrial equipment

+86 755 298 85888 Europe, Middle East +353 61 225 977 North America +1 408 785 5200 © 2019 Bel Power Solutions & Protection Rev. D1.04.19 PART NUMBER OUTPUT VOLTAGE INPUT VOLTAGE MAX. OUTPUT CURRENT MAX. OUTPUT POWER TYPICAL EFFICIENCY SLDN-03D1A0 (Active High) SLDN-03D1AL ((Active Low) 0.45 VDC – 5.5 VDC 3 VDC – 14.4 VDC 3 A 16.5 W 94 % NOTE: Add “G” suffix at the end of the model number to indicate Tray Packaging. S LDN - 03 D 1A 0 x Mounting type Series code Output current Wide input voltage range Sequencing Logic status Package Surface mount SLDN series 3 A 3-14.4V With sequencing 0 – active high L – active low G – Tray R – Tape & Reel PARAMETER DESCRIPTION MIN TYP MAX UNITS Continuous Input Voltage -0.3 15 V Voltage on SEQ, SYNC, VS+ terminal - 7 V Voltage on CLK, DATA, SMBALERT terminal - 3.6 V Operating Ambient Temperature See Thermal Considerations section -40 85 C Storage Temperature -55 125 C Altitude - 2000 m NOTE: Stresses in excess of the absolute maximum ratings can cause permanent damage to the device. These are absolute stress ratings only; functional operation of the device is not implied at these or any other conditions in excess of those given in the operations sections of the data sheet. Exposure to absolute maximum ratings for extended periods can adversely affect the device reliability. PARAMETER DESCRIPTION MIN TYP MAX UNIT Operating Input Voltage 3 - 14.4 V Input Current (full load) VIN = 3 V to 14 V - - 2.8 A Input Current (no load) VO,set = 0.6 VDC VIN = 12 VDC, IO = 0, module enabled - 17.5 - mA VO,set = 5 VDC - 43 - mA Input Stand-by Current VIN = 12 V, module disabled - 6.4 - mA Input Reflected Ripple Current (pk-pk) 5 Hz to 20 MHz, 1 μH source impedance, VIN =0 to 14V, IO= IOmax ; See Test Configurations - 100 - mA I2t Inrush Current Transient - - 1 A2s Input Ripple Rejection (120 Hz) - -57 - dB NOTE: Unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature conditions.

+86 755 298 85888 Europe, Middle East +353 61 225 977 North America +1 408 785 5200 © 2019 Bel Power Solutions & Protection Rev. D1.04.19 PARAMETER DESCRIPTION MIN TYP MAX UNIT Output Voltage Set Point With 0.1% tolerance for external resistor used to set output voltage -1.0 - +1.0 %Vo,set Output Voltage Over all operating input voltage, resistive load, and temperature conditions until end of life -3.0 - +3.0 %Vo,set Output Voltage Overshoot - - 3.0 %Vo,set Power Management Bus Adjustable Output Voltage Range -25 0 +25 %Vo,set Power Management Bus Output Voltage Adjustment Step Size - 0.4 - %Vo,set Adjustment Range 1.Selected by an external resistor 2.Some output voltages may not be possible depending on the input voltage – see Feature Descriptions Section 0.6 - 5.5 V Remote Sense Range - - 0.5 V Load Regulation VO ≥ 2.5 V VO < 2.5 V IO = IO, min to IO, max mV mV Line Regulation VO ≥ 2.5 V VO < 2.5 V VIN = VIN, min to VIN, max 0.4 %Vo,set mV Temperature Regulation Tref=TA, min to TA, max - - 0.4 %Vo,set Ripple and Noise (pk-pk) 5Hz to 20MHz BW, VIN=VIN, nom and IO=IO, min to IO, max Co = 0.1μF // 22 μF ceramic capacitors) - 50 100 mV Ripple and Noise (rms) - 20 38 mV Output Short-Circuit Current Vo≤250mV, Hiccup Mode - 268 - mArms Output Capacitance2 ESR ≥ 1 mΩ ESR ≥ 0.15 mΩ ESR ≥ 10 mΩ Without the Tunable LoopTM With the Tunable LoopTM With the Tunable LoopTM 1000 3000 uF uF uF Output Current In either sink or source mode 0 - 3 A Output Current Limit Inception Current limit does not operate in sink mode - 270 - % Io,max Turn-On Delay Times (VIN=VIN, nom, IO=IO, max , VO to within ±1% of steady state) Case 1: On/Off input is enabled and then input power is applied. (delay from instant at which VIN = VIN, min until Vo = 10% of Vo, set - 0.4 - ms Case 2: Input power is applied for at least one second and then the On/Off input is enabled (delay from instant at which Von/Off is enabled until Vo = 10% of Vo, set) - 0.4 - ms Output voltage Rise time Time for Vo to rise from 10% of Vo, set to 90% of Vo, set - 2.4 - ms NOTES: Unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature conditions. External capacitors may require using the new Tunable LoopTM feature to ensure that the module is stable as well as getting the best transient response. See the Tunable LoopTM section for details.

+86 755 298 85888 Europe, Middle East +353 61 225 977 North America +1 408 785 5200 © 2019 Bel Power Solutions & Protection Rev. D1.04.19 PARAMETER DESCRIPTION MIN TYP MAX UNIT Efficiency Vo = 0.6 V Vo = 1.2 V Vo = 1.8 V Vo = 2.5 V Vo = 3.3 V Vo = 5.0 V Vin = 12 VDC, TA = 25°C Io = Io, max, Vo= Vo,set 72.4 83.2 87.5 90.1 91.9 94.0 Switching Frequency - 600 - kHz Synchronization Frequency Range 510 - 720 kHz High-Level Input Voltage 2.0 - - V Low-Level Input Voltage - - 0.4 V Input Current, SYNC - - 100 nA Minimum Pulse Width, SYNC 100 nS Maximum SYNC rise time 100 nS Over Temperature Protection - 150 - C Power Management Bus Over Temperature Warning Threshold Over temperature Warning – Warning may not activate before alarm and unit may shutdown before warning - 130 - C Power Management Bus Adjustable Input Under Voltage Lockout Thresholds 2.5 - 14 V Resolution of Adjustable Input Under Voltage Threshold - - 500 mV Input Undervoltage Lockout Turn-on Threshold Turn-off Threshold Hysteresis 2.71 2.41 0.3 V V V Tracking Accuracy Power-Up: 2V/ms Power-Down: 2V/ms Vin, min to Vin, max; Io, min to Io, max, VSEQ < Vo 100 100 mV mV PGOOD (Power Good) Overvoltage threshold for PGOOD ON Overvoltage threshold for PGOOD OFF Undervoltage threshold for PGOOD ON Undervoltage threshold for PGOOD OFF Pulldown resistance of PGOOD pin Sink current capability into PGOOD pin Signal Interface Open Drain, Vsupply  5 Vdc 108 110 %VO, set %VO, set %VO, set %VO, set Ω mA Weight - 0.96 - g MTBF Calculated MTBF (IO=0.8IO, max, TA=40°C) Telecordia Issue 2 Method 1 Case 3 19,508,839 hours Dimensions (L × W × H) 0.48 x 0.48 x 0.246 12.2 x 12.2 x 6.25 in mm Power Management Bus Signal Interface Characteristics Input High Voltage (CLK, DATA) 2.1 - 3.6 V Input Low Voltage (CLK, DATA) - - 0.8 V Input high level current (CLK, DATA) -10 - 10 uA Input low level current (CLK, DATA) -10 - 10 uA Output Low Voltage (CLK, DATA, SMBALERT#) Iout = 2 mA - - 0.4 V Output high level open drain leakage current (DATA, SMBALERT#) Vout = 3.6 V 0 - 10 uA Pin capacitance - 0.7 - pF Power Management Bus Operating frequency range 10 - 400 kHz Data setup time 250 - - ns Data hold time Receive Mode Transmit Mode 300 - - ns

+86 755 298 85888 Europe, Middle East +353 61 225 977 North America +1 408 785 5200 © 2019 Bel Power Solutions & Protection Rev. D1.04.19 Measurement System Characteristics Read delay time 153 192 231 us Output current measurement range 0 - 18 A Output current measurement resolution 62.5 - - mA Output current measurement gain accuracy - - ±5 % Output current measurement offset - - 0.1 A VOUT measurement range 0 - 5.5 V VOUT measurement resolution - 15.625 - mV VOUT measurement gain accuracy -15 - 15 % VOUT measurement offset -3 - 3 % VIN measurement range 3 - 14.4 V VIN measurement resolution - 32.5 - mV VIN measurement gain accuracy -15 - 15 % VIN measurement offset -5.5 - 1.4 LSB NOTE: Unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature conditions. See Feature Descriptions for additional information.

+86 755 298 85888 Europe, Middle East +353 61 225 977 North America +1 408 785 5200 © 2019 Bel Power Solutions & Protection Rev. D1.04.19 EFFICIENCY,  (%) EFFICIENCY,  (%) OUTPUT CURRENT, IO (A) OUTPUT CURRENT, IO (A) Vo = 0.6 V Vo = 1.2 V EFFICIENCY,  (%)) EFFICIENCY,  (%) OUTPUT CURRENT, IO (A) OUTPUT CURRENT, IO (A) Vo = 1.8 V Vo = 2.5 V EFFICIENCY,  (%)) EFFICIENCY,  (%) OUTPUT CURRENT, IO (A) OUTPUT CURRENT, IO (A) Vo = 3.3 V Vo = 5.0 V 0 0.5 1 1.5 2 2.5 3 Vin=3.3V Vin=14VVin=12V 0 0.5 1 1.5 2 2.5 3 Vin=3.3V Vin=14V Vin=12V 0 0.5 1 1.5 2 2.5 3 Vin=3.3V Vin=14V Vin=12V 100 0 0.5 1 1.5 2 2.5 3 Vin=4.5V Vin=14V Vin=12V 100 0 0.5 1 1.5 2 2.5 3 Vin=4.5V Vin=14V Vin=12V 100 0 0.5 1 1.5 2 2.5 3 Vin=7V Vin=14V Vin=12V

+86 755 298 85888 Europe, Middle East +353 61 225 977 North America +1 408 785 5200 © 2019 Bel Power Solutions & Protection Rev. D1.04.19 OUTPUT CURRENT, Io (A) OUTPUT CURRENT, Io (A) AMBIENT TEMPERATURE, TA OC AMBIENT TEMPERATURE, TA OC Vo = 0.6 V Vo = 1.2 V OUTPUT CURRENT, Io (A) OUTPUT CURRENT, Io (A) AMBIENT TEMPERATURE, TA OC AMBIENT TEMPERATURE, TA OC Vo = 1.8 V Vo = 2.5 V OUTPUT CURRENT, Io (A) OUTPUT CURRENT, Io (A) AMBIENT TEMPERATURE, TA OC AMBIENT TEMPERATURE, TA OC Vo = 3.3 V Vo = 5.0 V 1.5 2.0 2.5 3.0 3.5 55 65 75 85 95 105 0.5m/s (100LFM) NC Standard Part (85°C) Ruggedized (D) Part (105°C) 1.5 2.0 2.5 3.0 3.5 55 65 75 85 95 105 0.5m/s (100LFM) NC Standard Part (85 C) Ruggedized (D) Part (105°C) 1.5 2.0 2.5 3.0 3.5 55 65 75 85 95 105 0.5m/s (100LFM) NC Standard Part (85°C) Ruggedized (D) Part (105°C) 1.5 2.0 2.5 3.0 3.5 55 65 75 85 95 105 0.5m/s (100LFM) NC Standard Part (85°C) Ruggedized (D) Part (105°C) 1.5 2.0 2.5 3.0 3.5 55 65 75 85 95 105 0.5m/s (100LFM) NC Standard Part (85°C) Ruggedized (D) Part (105°C) 1.5 2.0 2.5 3.0 3.5 45 55 65 75 85 95 105 1m/s (200LFM) 0.5m/s (100LFM) NC Ruggedized (D) Part (105°C) Standard Part (85°C)

+86 755 298 85888 Europe, Middle East +353 61 225 977 North America +1 408 785 5200 © 2019 Bel Power Solutions & Protection Rev. D1.04.19 OUTPUT VOLTAGE VO (V) (10mV/div) OUTPUT VOLTAGE VO (V) (10mV/div) TIME, t (1s/div) TIME, t (1s/div) Vo=0.6V, Io = Io,max Vo=1.2V, Io = Io,max OUTPUT VOLTAGE VO (V) (10mV/div) OUTPUT VOLTAGE VO (V) (20mV/div) TIME, t (1s/div) TIME, t (1s/div) Vo=1.8V, Io = Io,max Vo=2.5V, Io = Io,max OUTPUT VOLTAGE VO (V) (20mV/div) OUTPUT VOLTAGE VO (V) (50mV/div) TIME, t (1s/div) TIME, t (1s/div) Vo=3.3V, Io = Io,max Vo=5.0V, Io = Io,max

+86 755 298 85888 Europe, Middle East +353 61 225 977 North America +1 408 785 5200 © 2019 Bel Power Solutions & Protection Rev. D1.04.19 OUTPUT CURRENT, OUTPUT VOLTAGE IO (A) (1Adiv) VO (V) 10mV/div) OUTPUT CURRENT, OUTPUT VOLTAGE IO (A) (1Adiv) VO (V) (10 mV/div) TIME, t (20s /div) TIME, t (20s /div) Transient Response to Dynamic Load Change from 50% to 100% at 12Vin, Cout= 1x47uF+2x330uF, CTune=27nF, RTune=180. Vo=0.6V Transient Response to Dynamic Load Change from 50% to 100% at 12Vin, Cout= 1x47uF+1x330uF, CTune=10nF & RTune=267. Vo=1.2V OUTPUT CURRENT, OUTPUT VOLTAGE IO (A) (1Adiv) VO (V) (10mV/div) OUTPUT CURRENT, OUTPUT VOLTAGE IO (A) (1Adiv) VO (V) (20mV/div) TIME, t (20s /div) TIME, t (20s /div) Transient Response to Dynamic Load Change from 50% to 100% at 12Vin, Cout= 1x47uF +1x330uF, CTune=10nF & RTune=267. Vo=1.8V Transient Response to Dynamic Load Change from 50% to 100% at 12Vin, Cout= 2x47uF, CTune=2700pF & RTune=267. Vo=2.5V OUTPUT CURRENT, OUTPUT VOLTAGE IO (A) (1Adiv) VO (V) (20mV/div) OUTPUT CURRENT, OUTPUT VOLTAGE IO (A) (1Adiv) VO (V) (50mV/div) TIME, t (20s /div) TIME, t (20s /div) Transient Response to Dynamic Load Change from 50% to 100% at 12Vin, Cout= 2x47uF, CTune=2200pF & RTune=267. Vo=3.3V Transient Response to Dynamic Load Change from 50% to 100% at 12Vin, Cout= 1x47uF, CTune=820pF & RTune=267. Vo=5.0V

+86 755 298 85888 Europe, Middle East +353 61 225 977 North America +1 408 785 5200 © 2019 Bel Power Solutions & Protection Rev. D1.04.19 OUTPUT VOLTAGE ON/OFF VOLTAGE VO (V) (200mV/div) VON/OFF (V) (5V/div) OUTPUT VOLTAGE ON/OFF VOLTAGE VO (V) (500mV/div) VON/OFF (V) (5V/div) TIME, t (2 ms/div) TIME, t (2 ms/div) Start-up Using On/Off Voltage (Io = Io,max), Vo=0.6V Start-up Using On/Off Voltage (Io = Io,max), Vo=1.2V OUTPUT VOLTAGE ON/OFF VOLTAGE VO (V) (500mV/div) VON/OFF (V) (5V/div) OUTPUT VOLTAGE ON/OFF VOLTAGE VO (V) (1V/div) VON/OFF (V) (5V/div) TIME, t (2 ms/div) TIME, t (2 ms/div) Start-up Using On/Off Voltage (Io = Io,max), Vo=1.8V Start-up Using On/Off Voltage (Io = Io,max), Vo=2.5V OUTPUT VOLTAGE ON/OFF VOLTAGE VO (V) (1V/div) VON/OFF (V) (5V/div) OUTPUT VOLTAGE ON/OFF VOLTAGE VO (V) (2V/div) VON/OFF (V) (5V/div) TIME, t (2 ms/div) TIME, t (2 ms/div) Start-up Using On/Off Voltage (Io = Io,max), Vo=3.3V Start-up Using On/Off Voltage (Io = Io,max), Vo=5.0V

+86 755 298 85888 Europe, Middle East +353 61 225 977 North America +1 408 785 5200 © 2019 Bel Power Solutions & Protection Rev. D1.04.19 OUTPUT VOLTAGE INPUT VOLTAGE VO (V) (200mV/div) VIN (V) (5V/div) OUTPUT VOLTAGE INPUT VOLTAGE VO (V) (500mV/div) VIN (V) (5V/div) TIME, t (2 ms/div) TIME, t (2 ms/div) Start-up Using Input Voltage (VIN = 12V, Io = Io,max ), Vo=0.60V Start-up Using Input Voltage (VIN = 12V, Io = Io,max ), Vo=1.2V OUTPUT VOLTAGE INPUT VOLTAGE VO (V) (500mV/div) VIN (V) (5V/div) OUTPUT VOLTAGE INPUT VOLTAGE VO (V) (1V/div) VIN (V) (5V/div) TIME, t (2 ms/div) TIME, t (2 ms/div) Start-up Using Input Voltage (VIN = 12V, Io = Io,max ), Vo=1.8V Start-up Using Input Voltage (VIN = 12V, Io = Io,max ), Vo=2.5V OUTPUT VOLTAGE INPUT VOLTAGE VO (V) (1V/div) VIN (V) (5V/div) OUTPUT VOLTAGE INPUT VOLTAGE VO (V) (2V/div) VIN (V) (5V/div) TIME, t (2 ms/div) TIME, t (2 ms/div) Start-up Using Input Voltage (VIN = 12V, Io = Io,max ), Vo=3.3V Start-up Using Input Voltage (VIN = 12V, Io = Io,max ), Vo=5.0V

+86 755 298 85888 Europe, Middle East +353 61 225 977 North America +1 408 785 5200 © 2019 Bel Power Solutions & Protection Rev. D1.04.19 For safety agency approval the power module must be installed in c ompliance with the spacing and separation requirements of the end-use safety agency standards, i.e., UL 60950 -1 2nd, CSA C22.2 No. 60950-1-07, DIN EN 60950-1:2006 + A11 (VDE0805 Teil 1 + A11):2009-11; EN 60950-1:2006 + A11:2009-03. For the converter output to be considered meeting the requirements of safety extra -low voltage (SELV), the input must meet SELV requirements. The power module has extra-low voltage (ELV) outputs when all inputs are ELV. The input to these units is to be provided with a slow-blow fuse with a maximum rating of 5 A in the positive input lead. PARAMETER DESCRIPTION MIN TYP MAX UNIT Signal Low (Unit On) Active Low The remote on/off pin open, Unit on. -0.2 - 0.6 V Signal High (Unit Off) 2.0 - Vin,max V Signal Low (Unit Off) Active High The remote on/off pin open, Unit on. -0.2 - 0.6 V Signal High (Unit On) 2.0 - Vin,max V The SLDN -03D1Ax module can be turned ON and OFF either by using the ON/OFF pin or through the Power Management Bus interface (Digital). The module can be configured in a number of ways through the Power Management Bus interface to react to the two ON/OFF inputs:

Module ON/OFF can be controlled only through the analog interface (digital interface ON/OFF commands are ignored).
Module ON/OFF can be controlled only through the Power Management Bus interface (analog interface is ignored).
Module ON/OFF can be controlled by either the analog or digital interface. The default state of the module (as shipped from the factory) is to be con trolled by the analog interface only. If the digital interface is to be enabled, or the module is to be controlled only through the digital interface, this change must be made through the Power Management Bus . These changes can be made and written to non -volatile memory on the module so that it is remembered for subsequent use. The SLDN-03D1Ax modules feature an On/Off pin for remote On/Off operation. Two On/Off logic options are available. In the Positive Logic On/Off option, (device code suffix “ 0” – see Ordering Information), the module turns ON during a logic High on the On/Off pin and turns OFF during a logic Low. With the Negative Logic On/Off option, (device code suffix “ L” – see Ordering Information), the module turns OFF during logic High an d ON during logic Low. The On/Off signal should be always referenced to ground. For either On/Off logic option, leaving the On/Off pin disconnected will turn the module ON when input voltage is present. For positive logic modules, the circuit configuration for using the On/Off pin is shown in Figure 39. When the external transistor Q2 is in the OFF state, the internal transistor Q1 is turned ON, and the internal PWM #Enable signal is pulled low causing the modu le to be ON. When transistor Q2 is turned ON, the On/Off pin is pulled low and the module is OFF. A suggested value for Rpullup is 20k For negative logic On/Off modules, the circuit configuration is shown in Fig. 40. The On/Off pin should be pulled high with an external pull-up resistor (suggested value for the 3V to 14V input range is 20Kohms). When transistor Q2 is in the OFF state, the On/Off pin is pulled high, transistor Q1 is turned ON and the module is OFF. To turn the module ON, Q2 is turned ON pulling the On/Off pin low, turning transistor Q1 OFF resulting in the PWM Enable pin going high.

+86 755 298 85888 Europe, Middle East +353 61 225 977 North America +1 408 785 5200 © 2019 Bel Power Solutions & Protection Rev. D1.04.19 VO(+) TRIM VS─ Rtrim LOAD VIN(+) ON/OFF VS+ SIG_GND Figure 42. Caution – Do not connect SIG_GND to GND elsewhere in the layout Circuit configuration for programming output voltage using an external resistor. Without an external resistor between Trim and SIG_GND pins, the output of the module will be 0.6 Vdc.To calculate the value of the trim resistor, Rtrim for a desired output voltage, should be as per the following equation: ( )  −= kVoRtrim 6.0 Rtrim is the external resistor in kΩ Vo is the desired output voltage. VO, set (V) Rtrim (KΩ)

0.6 Open

0.9 40 1.0 30 1.2 20 1.5 13.33 1.8 10 2.5 6.316 3.3 4.444 5.0 2.727 Table 1 Rtrim values required for some common output voltages. Please see the Digital Feature Descriptions section. The SLDN-03D1Ax power module has a Remote Sense feature to minimize the effects of distribution losses by regulating the voltage between the sense pins (VS+ and VS-). The voltage drop between the sense pins and the VOUT and GND pins of the module should not exceed 0.5V.

+86 755 298 85888 Europe, Middle East +353 61 225 977 North America +1 408 785 5200 © 2019 Bel Power Solutions & Protection Rev. D1.04.19 When the scaled down sequencing voltage is applied to the SEQ pin, the output voltage tracks this voltage until the output re aches the set-point voltage. The final value of the sequencing voltage must be set higher than the set -point voltage of the module . The output voltage follows the sequencing voltage on a one-to-one basis. By connecting multiple modules together, multiple modules can track their output voltages to the voltage applied on the SEQ pin. To initiate simultaneous shutdown of the modules, t he SEQ pin voltage is lowered in a controlled manner. The output voltage of the modules tracks the voltages below their set-point voltages on a one-to-one basis. A valid input voltage must be maintained until the tracking and output voltages reach ground potential. Note that in all digital Bel series of modules, the Power Management Bus Output Undervoltage Fault will be tripped when sequencing is employed. This will be detected using the STATUS_WORD and STATUS_VOUT Power Management Bus commands. In addition, the SMBALERT# signal will be asserted low as occurs for all faults and warnings. To avoid the module shutting down due to the Output Undervoltage Fault, the module must be set to continue operation without interruption as the response to this fault (see the description of the Power Management Bus command VOUT_UV_FAULT_RESPONSE for additional information). To provide protection in a fault (output overload) condition, the unit is equipped with internal current -limiting circuitry and can endure current limiting continuously. At the point of current-limit inception, the unit enters hiccup mode. The unit operates normally once the output current is brought back into its specified range. Please see the Digital Feature Descriptions section. To provide protection in a fault condition, the unit is equipped with a thermal shutdown circuit. The unit will shut down if the overtemperature threshold of 15°C (typ) is exceeded at the thermal reference point Tref. Once the unit goes into thermal shutdown it will then wait to cool before attempting to restart. Please see the Digital Feature Descriptions section. Please see the Digital Feature Descriptions section. At input voltages below the input undervoltage lockout limit, the module operation is disabled. The module will begin to operate at an input voltage above the undervoltage lockout turn-on threshold. Please see the Digital Feature Descriptions section. Please see the Digital Feature Descriptions section.

The SLDN-03D1Ax module has a feature that optimizes transient response of the module called Tunable LoopTM. capacitance however affects the voltage control loop of the module, typically causing the loop to slow down with sluggish res ponse. Larger values of external capacitance could also cause the module to become unstable. in Fig. 47. This R-C allows the user to externally adjust the voltage loop feedback compensation of the module. Figure 47. Circuit diagram showing connection of RTUME and CTUNE to tune the control loop of the module. common output voltages in the presence of a 0A to 1.5A step change (50% of full load), with an input voltage of 12V. Table 2. General recommended values of of RTUNE and CTUNE for Vin=12V and various external ceramic capacitor combinations. Table 3. Recommended values of RTUNE and CTUNE to obtain transient deviation of 2% of Vout for a 1.5A step load with Vin=12V. Note: The capacitors used in the Tunable Loop tables are 47 μF/3 mΩ ESR ceramic and 330 μF/12 mΩ ESR polymer capacitors.

+86 755 298 85888 Europe, Middle East +353 61 225 977 North America +1 408 785 5200 © 2019 Bel Power Solutions & Protection Rev. D1.04.19 The SLDN-03D1Ax modules have a Power Management Bus interface that supports both communication and control. The modules support a subset of version 1.1 of the specification (see Table 6 for a list of the specific commands supported). Most module parameters can be programmed using Power Management Bus and stored as defaults for later use.\\ All communication over the module Power Management Bus interface must support the Packet Error Checking (PEC) scheme. The Power Management Bus master must generate the correct PEC byte for all transactions and check the PEC byte returned by the module. The module also supports the SMBALERT response protocol whereby the module can alert the bus master if it wants to talk. For more information on the SMBus alert response protocol, see the System Management Bus (SMBus) specification. The module has n on-volatile memory that is used to store configuration settings. Not all settings programmed into the device are automatically saved into this non-volatile memory, only those specifically identified as capable of being stored can be saved (see Table 6 for which command parameters can be saved to non-volatile storage). For commands that set thresholds, voltages or report such quantities, the module supports the “Linear” data format among the three data formats supported by Power Management Bus. The Linear Data Format is a two -byte value with an 11 -bit, two’s complement mantissa and a 5-bit, two’s complement exponent. The format of the two data bytes is shown below: Data Byte High 7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0 Data Byte Low Exponent MSB Mantissa MSB The value is of the number is then given by Value = Mantissa x 2 Exponent The SLDN -03D1Ax module can be addressed through the Power Management Bus using a device address. The module has 64 possible addresses (0 to 63 in decimal) which can be set using resistors connected from the ADDR0 and ADDR1 pins to SIG_GND. Note that some of these addresses (0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 12, 40, 44, 45, 55 in decimal) are reserved according to the SMBus specifications and may not be useable. The address is set in the form of two octal (0 to 7) digits, with each pin setting one digit. The ADDR1 pin sets the high order digit and ADDR0 sets the low order digit. The resistor values suggested for each digit are show n in Table 4 (1% tolerance resistors are recommended). Note that if either address resistor value is outside the range specified in Table 4, the module will respond to address 127. Digit Resistor Value (KΩ) 0 10 1 15.4 2 23.7 3 36.5 4 54.9 5 84.5 6 130 7 200 Table 4

Figure 48. Circuit showing connection of resistors used to set the Power Management Bus address of the module. and the Power Management Bus OPERATION command. This bit is used together with the CP, CMD and ON bits to determine startup.

0 Module powers up any time power is present regardless of state of the analog ON/OFF pin

1 Module does not power up until commanded by the analog ON/OFF pin and the OPERATION

command as programmed in bits [2:0] of the ON_OFF_CONFIG register. CMD: The CMD bit controls how the device responds to the OPERATION command.

0 Module ignores the ON bit in the OPERATION command

1 Module responds to the ON bit in the OPERATION command

CPR: Sets the response of the analog ON/OFF pin. This bit is used together with the CMD, PU and ON bits to determine startup.

1 Module requires the analog ON/OFF pin to be asserted to start the unit

of the mantissa are also fixed at 0. Table 5. Output Voltage Adjustment Using the Power Management Bus VOUT_SCALE_LOOP command is 0.2%. the module, which in turn changes the regulated output voltage of the module. the VOUT_TRIM command over the Power Management Bus.

+86 755 298 85888 Europe, Middle East +353 61 225 977 North America +1 408 785 5200 © 2019 Bel Power Solutions & Protection Rev. D1.04.19 The SLDN -03D1Ax module can also have its output voltage margined via Power Management Bus commands. The command VOUT_MARGIN_HIGH sets the margin high voltage, while the command VOUT_MARGIN_LOW sets the margin low voltage. Both the VOUT_MARGIN_HIGH and VOUT_MARGIN_LOW commands use the “Linear” mode with the exponent fixed at –10 (decimal). Two bytes are used for the mantissa with the upper bit [7] of the high byte fixed at 0. The actual margined output v oltage is a combination of the VOUT_MARGIN_HIGH or VOUT_MARGIN_LOW and the VOUT_TRIM values as shown below: TRIMVOUTHIGHMARGINVOUT V MHOUT TRIMVOUTLOWMARGINVOUT V MLOUT Note that the sum of the margin and trim voltages cannot be outside the ±25% window around the nominal output voltage. The data associated with VOUT_MARGIN_HIGH and VOUT_MARGIN_LOW can be stored to non -volatile memory using the STORE_DEFAULT_ALL command. The module is commanded to go to the margined high or low voltages using the OPERATION command. Bits [5:2] are used to enable margining as follows: 00XX : Margin Off 0101 : Margin Low (Ignore Fault) 0110 : Margin Low (Act on Fault) 1001 : Margin High (Ignore Fault) 1010 : Margin High (Act on Fault) The SLDN-03D1Ax module can provide an overcurrent warning via the Power Management Bus . The threshold for the overcurrent warning can be set using the parameter IOUT_OC_WARN_LIMIT. This command uses the “Linear” data format with a two byte data word where the upper five bits [7:3] of the high byte represent the exponent and the remaining three bits of the high byte [2:0] and the eight bits in the low byte represent the mantissa. The exponent is fixed at – 1(decimal). The upper six bits of the mantissa are fixed at 0 while the lower five bits are programmable with a default value of 5A . The resolution of this warning limit is 500mA. The value of the IOUT_OC_WARN_LIMIT can be stored to non-volatile memory using the STORE_DEFAULT_ALL command. The SLDN-03D1Ax module can provide information related to temperature of the module through the STATUS_TEMPERATURE command. The command returns information about whether the pre-set over temperature fault threshold and/or the warning threshold have been exceeded. The SLDN -03D1Ax module has output over and under voltage protection capability. The Power Management Bus command VOUT_OV_FAULT_LIMIT is used to set the output over voltage threshold from four possible values: 108%, 110%, 112% or 115% of the commanded output voltage. The command VOUT_UV_FAULT_LIMIT sets the threshold that causes an output under voltage fault and can also be selected from four possible values: 92%, 90%, 88% or 85%. The default values are 112% an d 88% of commanded output voltage. Both commands use two data bytes formatted as two’s complement binary integers. The “Linear” mode is used with the exponent fixed to –10 (decimal) and the effective over or under voltage trip points given by )_( )_( 2)___( 2)___( LIMITFAULTUVVOUTV LIMITFAULTOVVOUTV REQUVOUT REQOVOUT

+86 755 298 85888 Europe, Middle East +353 61 225 977 North America +1 408 785 5200 © 2019 Bel Power Solutions & Protection Rev. D1.04.19 Values within the supported range for over and undervoltage detection thresholds will be set to the nearest fixed percentage. Note that the correct value for VOUT_SCALE_LOOP must be set in the module for the correct over or under voltage trip points to be calculated. In addition to adjustable output voltage protection, the 3A Digital module can also be programmed for the response to the fau lt. The VOUT_OV_FAULT RESPONSE and VOUT_UV_FAULT_RESPONSE commands specify the response to the fault. Bot h these commands use a single data byte with the possible options as shown below.: 1. Continue operation without interruption (Bits [7:6] = 00, Bits [5:3] = xxx). 2. Continue for four switching cycles and then shut down if the fault is still present, followed by no restart or continuous restart (Bits [7:6] = 01, Bits [5:3] = 000 means no restart, Bits [5:3] = 111 means continuous restart). 3. Immediate shut down followed by no restart or continuous restart (Bits [7:6] = 10, Bits [5:3] = 000 means no restart, Bits [5:3] = 111 means continuous restart). 4. Module output is disabled when the fault is present, and the output is enabled when the fault no longer exists (Bits [7:6] = 11, Bits [5:3] = xxx). Note that separate response choices are possible for output over voltage or under voltage faults. The SLDN-03D1Ax module allows adjustment of the input under voltage lockout and hysteresis. The command VIN_ON allows setting the input voltage turn on threshold, while the VIN_OFF command sets the input voltage turn off threshold. For the VIN_ON command, other values are entered for either command, they will be mapped to the closest of the allowed values. VIN_ON must be set higher than VIN_OFF. Attempting to write either VIN_ON lower than VIN_OFF or VIN_OFF higher than VIN_ON results in the new value being rejected, SMBALERT being asserted along wit h the CML bit in STATUS_BYTE and the invalid data bit in STATUS_CML. Both the VIN_ON and VIN_OFF commands use the “Linear” format with two data bytes. The upper five bits represent the exponent (fixed at -2) and the remaining 11 bits represent the mantissa. For the mantissa, the four most significant bits are fixed at 0. The SLDN-03D1Ax module provides a Power Good (PGOOD) signal that is implemented with an open-drain output to indicate that the output voltage is within the regulation limits of the power module. The PGOOD signal will be de-asserted to a low state if any condition such as overtemperature, overcurrent or loss of regulation occurs that would result in the output voltage going outside the s pecified thresholds. The PGOOD thresholds are user selectable via the Power Management Bus (the default values are as shown in the Feature Specifications Section). Each threshold is set up symmetrically above and below the nominal value. The POWER_GOOD_ON command sets the output voltage level above which PGOOD is asserted (lower threshold). For example, with a 1.2V nominal output voltage, the POWER_GOOD_ON threshold can set the lower threshold to 1.14 or 1.1V. Doing this will automatically set the upper thresholds t o 1.26 or 1.3V. The POWER_GOOD_OFF command set s the level below which the PGOOD command is de -asserted. This command also sets two thresholds symmetrically placed around the nominal output voltage. Normally, the POWER_GOOD_ON threshold is set higher than the POWER_GOOD_OFF threshold. Both POWER_GOOD_ON and POWER_GOOD_OFF commands use the “Linear” format with the exponent fixed at –10 (decimal). The two thresholds are given by )_( )_( 2)__( 2)__( OFFGOODPOWERV ONGOODPOWERV OFFPGOODOUT ONPGOODOUT Both commands use two data bytes with bit [7] of the high byte fixed at 0, while the remaining bits are r/w and used to set the mantissa using two’s complement representation. Both commands also use the VOUT_SCALE_LOOP parameter so it must be set correctly. The default value of POWER_GOOD_ON is set at 1.1035V and that of the POWER_GOOD_OFF is set at 1.08V. The values associated with these commands can be stored in non-volatile memory using the STORE_DEFAULT_ALL command. The PGOOD terminal can be connected through a pullup resistor (suggested value 100 K) to a source of 5 VDC or lower.

+86 755 298 85888 Europe, Middle East +353 61 225 977 North America +1 408 785 5200 © 2019 Bel Power Solutions & Protection Rev. D1.04.19 The SLDN-03D1Ax module is capable of measuring key module parameters such as output current and voltage and input voltage and providing this information through the Power Management Bus interface. Roughly every 200μs, the module makes 16 measurements each of output current, voltage and input voltage. Average values of of these 16 measurements are then calculated and placed in the appropriate registers. The values in the registers can then be read using the Power Management Bus interface. The SLDN -03D1Ax module measures current by using the inductor winding resistance as a current sense element. The inductor winding resistance is then the current gain factor used to scale the measured voltag e into a current reading. This gain factor is the argument of the IOUT_CAL_GAIN command and consists of two bytes in the linear data format. The exponent uses the upper five bits [7:3] of the high data byte in two-s complement format and is fixed at –15 (decimal). The remaining 11 bits in two’s complement binary format represent the mantissa. The current measurement accuracy is also improved by each module being calibrated during manufacture with the offset in the current reading. The IOUT_CAL_OFFSET command is used to store and read the current offset. The argument for this command consists of two bytes composed of a 5-bit exponent (fixed at -4d) and a 11-bit mantissa. This command has a resolution of 62.5mA and a range of -4000mA to +3937.5mA. The READ_IOUT command provides module average output current information. This command only supports positive or current sourced from the module. If the converter is sinking current a reading of 0 is provided. The READ_IOUT command returns two by tes of data in the linear data format. The exponent uses the upper five bits [7:3] of the high data byte in two -s complement format and is fixed at –4 (decimal). The remaining 11 bits in two’s complement binary format represent the mantissa with the 11th bit fixed at 0 since only positive numbers are considered valid. Note that the current reading provided by the module is not corrected for temperature. The temperature corrected current reading for module temperature TModule can be estimated using the following equation 𝑰𝑶𝑼𝑻,𝑪𝑶𝑹𝑹 = 𝑰𝑹𝑬𝑨𝑫_𝑶𝑼𝑻 where IOUT_CORR is the temperature corrected value of the current measurement, IREAD_OUT is the module current measurement value, TIND is the temperature of the inductor winding on the module. Since it may be difficult to measure TIND, it may be approximated b y an estimate of the module temperature. The SLDN-03D1Ax module can provide output voltage information using the READ_VOUT command. The command returns two bytes of data all representing the mantissa while the exponent is fixed at -10 (decimal). During manufacture of the module, offset and gain correction values are written into the non -volatile memory of the module. The command VOUT_CAL_OFFSET can be used to read and/or write the offset (two bytes consisting of a 16 -bit mantissa in two’s complement format) while the exponent is always fixed at -10 (decimal). The allowed range for this offset correction is -125 to 124mV. The command VOUT_CAL_GAIN can be used to read and/or write the gain correction - two bytes consisting of a five -bit exponent output voltage reading is then given by: OFFSETCALVOUT GAINCALVOUTInitialV FinalV OUT OUT )]__1()([

+86 755 298 85888 Europe, Middle East +353 61 225 977 North America +1 408 785 5200 © 2019 Bel Power Solutions & Protection Rev. D1.04.19 The SLDN-03D1Ax module can provide output voltage information using the READ_VIN command. The command returns two bytes of data in the linear format. The upper five bits [7:3] of the high data form the two’s complement representation of the mantissa which is fixed at –5 (decimal). The remaining 11 bits are used for two’s complement representation of the mantissa, with the 11th bit fixed at zero since only positive numbers are valid. During module manufacture, offset and gain correction values are written i nto the non-volatile memory of the module. The command VIN_CAL_OFFSET can be used to read and/or write the offset - two bytes consisting of a five -bit exponent (fixed at -5) and a11-bit mantissa in two’s complement format. The allowed range for this offset correction is -2 to 1.968V, and the resolution is 32mV. The command VIN_CAL_GAIN can be used to read and/or write the gain correction - two bytes consisting of a five-bit exponent (fixed at voltage reading is then given by: OFFSETCALVIN GAINCALVINInitialV FinalV IN IN )]__1()([ The SLDN-03D1Ax module supports a number of status information commands implemented in Power Management Bus. However, not all features are supported in these commands. A 1 in the bit position indicates the fault that is flagged. STATUS_BYTE : Returns one byte of information with a summary of the most critical device faults. Bit Position Flag Default Value

7 X 0

6 OFF 0

5 VOUT Overvoltage 0

4 IOUT Overcurrent 0

3 VIN Undervoltage 0

2 Temperature 0

1 CML (Comm. Memory Fault) 0

0 None of the above 0

STATUS_WORD : Returns two bytes of information with a summary of the module’s fault/warning conditions. Low Byte Bit Position Flag Default Value 1 CML (Comm. Memory Fault) 0 Bit Position Flag Default Value

7 VOUT fault or warning 0

6 IOUT fault or warning 0

5 X 0

4 X 0

3 POWER_GOOD# (is negated) 0

2 X 0

1 X 0

0 X 0

+86 755 298 85888 Europe, Middle East +353 61 225 977 North America +1 408 785 5200 © 2019 Bel Power Solutions & Protection Rev. D1.04.19 STATUS_VOUT : Returns one byte of information relating to the status of the module’s output voltage related faults. Bit Position Flag Default Value

7 VOUT OV Fault 0

6 X 0

4 VOUT UV Fault 0

3 X 0

STATUS_IOUT : Returns one byte of information relating to the status of the module’s output voltage related faults. Bit Position Flag Default Value

7 IOUT OC Fault 0

5 IOUT OC Warning 0

STATUS_TEMPERATURE : Returns one byte of information relating to the status of the module’s temperature related faults. Bit Position Flag Default Value

7 OT Fault 0

6 OT Warning 0

STATUS_CML : Returns one byte of information relating to the status of the module’s communication related faults. Bit Position Flag Default Value

7 Invalid/Unsupported Command 0

6 Invalid/Unsupported Command 0

5 Packet Error Check Failed 0

1 Other Communication Fault 0

MFR_VIN_MIN : Returns minimum input voltage as two data bytes of information in Linear format (upper five bits are exponent – fixed at -2, and lower 11 bits are mantissa in two’s complement format – fixed at 12) MFR_VOUT_MIN : Returns minimum output voltage as two data bytes of information in Linear format (upper five bits are exponent – fixed at -10, and lower 11 bits are mantissa in two’s complement format – fixed at 614)

+86 755 298 85888 Europe, Middle East +353 61 225 977 North America +1 408 785 5200 © 2019 Bel Power Solutions & Protection Rev. D1.04.19 MFR_SPECIFIC_00 : Returns information r elated to the type of module and revision number. Bits [7:2] in the Low Byte indicate the module type (001000 corresponds to the SLDN-03D1Ax series of module), while bits [7:3] indicate the revision number of the module. Low Byte Bit Position Flag Default Value 7:2 Module Name 001000 1:0 Reserved 10 High Byte Bit Position Flag Default Value 7:3 Module Revision Number None 2:0 Reserved 000

+86 755 298 85888 Europe, Middle East +353 61 225 977 North America +1 408 785 5200 © 2019 Bel Power Solutions & Protection Rev. D1.04.19 Please refer to the Power Management Bus 1.1 specification for more details of these commands in table below Hex Code Command Brief Description Non-Volatile Memory Storage

01 OPERATION

Turn Module on or off. Also used to margin the output voltage Format Unsigned Binary Bit Position 7 6 5 4 3 2 1 0 Access r/w r r/w r/w r/w r/w r r Function On X Margin X X Default Value 0 0 0 0 0 0 X X

02 ON_OFF_CONFIG

Configures the ON/OFF functionality as a combination of analog ON/OFF pin and Power Management Bus commands Format Unsigned Binary Bit Position 7 6 5 4 3 2 1 0 Access r r r r/w r/w r/w r/w r Function X X X pu cmd cpr pol cpa Default Value 0 0 0 1 0 1 1 1 YES

03 CLEAR_FAULTS Clear any fault bits that may have been set, also releases the SMBALERT# signal if the

device has been asserting it.

10 WRITE_PROTECT

Used to control writing to the module via Power Management Bus. Copies the current register setting in the module whose command code matches the value in the data byte into non-volatile memory (EEPROM) on the module Format Unsigned Binary Bit Position 7 6 5 4 3 2 1 0 Access r/w r/w r/w x x x x x Function bit7 bit6 bit5 X X X X X Default Value 0 0 0 X X X X X Bit5: 0 – Enables all writes as permitted in bit6 or bit7 1 – Disables all writes except the WRITE_PROTECT, OPERATION and ON_OFF_CONFIG (bit 6 and bit7 must be 0) Bit 6: 0 – Enables all writes as permitted in bit5 or bit7 1 – Disables all writes except for the WRITE_PROTECT and OPERATION commands (bit5 and bit7 must be 0) Bit7: 0 – Enables all writes as permitted in bit5 or bit6 1 – Disables all writes except for the WRITE_PROTECT command (bit5 and bit6 must be 0) YES 11 STORE_DEFAULT_ALL Copies all current register settings in the module into non-volatile memory (EEPROM) on the module. Takes about 50ms for the command to execute. 12 RESTORE_DEFAULT_ALL Restores all current register settings in the module from values in the module non- volatile memory (EEPROM)

13 STORE_DEFAULT_CODE

Copies the current register setting in the module whose command code matches the value in the data byte into non-volatile memory (EEPROM) on the module Bit Position 7 6 5 4 3 2 1 0 Access w w w w w w w w Function Command code

14 RESTORE_DEFAULT_CODE

Restores the current register setting in the module whose command code matches the value in the data byte from the value in the module non-volatile memory (EEPROM) Bit Position 7 6 5 4 3 2 1 0 Access w w w w w w w w Function Command code

20 VOUT_MODE

The module has MODE set to Linear and Exponent set to -10. These values cannot be changed Bit Position 7 6 5 4 3 2 1 0 Access r r r r r r r r Function Mode Exponent Default Value 0 0 0 1 0 1 1 0

22 VOUT_TRIM

Apply a fixed offset voltage to the output voltage command value Format Linear, two’s complement binary Bit Position 7 6 5 4 3 2 1 0 Access r/w r r/w r/w r/w r/w r/w r/w Function High Byte Default Value 0 0 0 0 0 0 0 0 Bit Position 7 6 5 4 3 2 1 0 Access r/w r/w r/w r/w r/w r/w r/w r/w Function Low Byte Default Value 0 0 0 0 0 0 0 0 YES

25 VOUT_MARGIN_HIGH

Sets the target voltage for margining the output high Format Linear, two’s complement binary Bit Position 7 6 5 4 3 2 1 0 Access r r/w r/w r/w r/w r/w r/w r/w Function High Byte Default Value 0 0 0 0 0 1 0 1 Bit Position 7 6 5 4 3 2 1 0 Access r/w r/w r/w r/w r/w r/w r/w r/w Function Low Byte Default Value 0 1 0 0 0 1 1 1 YES

26 VOUT_MARGIN_LOW

Sets the target voltage for margining the output low Format Linear, two’s complement binary Bit Position 7 6 5 4 3 2 1 0 Access r r/w r/w r/w r/w r/w r/w r/w Function High Byte Default Value 0 0 0 0 0 1 0 0 Bit Position 7 6 5 4 3 2 1 0 Access r/w r/w r/w r/w r/w r/w r/w r/w Function Low Byte Default Value 0 1 0 1 0 0 0 1 YES

29 VOUT_SCALE_LOOP

Sets the scaling of the output voltage – equal to the feedback resistor divider ratio Format Linear, two’s complement binary Bit Position 7 6 5 4 3 2 1 0 Access r r r r r r r/w r/w Function Exponent Mantissa Default Value 1 0 1 1 1 0 0 1 Bit Position 7 6 5 4 3 2 1 0 Access r/w r/w r/w r/w r/w r/w r/w r/w Function Mantissa Default Value 0 0 0 0 0 0 0 0 YES

35 VIN_ON

Sets the value of input voltage at which the module turns on Format Linear, two’s complement binary Bit Position 7 6 5 4 3 2 1 0 Access r r r r r r r r Function Exponent Mantissa Default Value 1 1 1 1 0 0 0 0 Bit Position 7 6 5 4 3 2 1 0 Access r r/w r/w r/w r/w r/w r/w r/w Function Mantissa Default Value 0 0 0 0 1 0 1 1 YES

36 VIN_OFF

Sets the value of input voltage at which the module turns off Format Linear, two’s complement binary Bit Position 7 6 5 4 3 2 1 0 Access r r r r r r r r Function Exponent Mantissa Default Value 1 1 1 1 0 0 0 0 Bit Position 7 6 5 4 3 2 1 0 Access r r/w r/w r/w r/w r/w r/w r/w Function Mantissa Default Value 0 0 0 0 1 0 1 0 YES

38 IOUT_CAL_GAIN

Returns the value of the gain correction term used to correct the measured output current Format Linear, two’s complement binary Bit Position 7 6 5 4 3 2 1 0 Access r r r r r r r r/w Function Exponent Mantissa Default Value 1 0 0 0 1 0 0 V Bit Position 7 6 5 4 3 2 1 0 Access r/w r/w r/w r/w r/w r/w r/w r/w Function Mantissa Default Value V: Variable based on factory calibration YES

39 IOUT_CAL_OFFSET

Returns the value of the offset correction term used to correct the measured output current Format Linear, two’s complement binary Bit Position 7 6 5 4 3 2 1 0 Access r r r r r r/w r r Function Exponent Mantissa Default Value 1 1 1 0 0 V 0 0 Bit Position 7 6 5 4 3 2 1 0 Access r r r/w r/w r/w r/w r/w r/w Function Mantissa Default Value 0 0 V: Variable based on factory calibration YES

40 VOUT_OV_FAULT_LIMIT

Sets the voltage level for an output overvoltage fault. Exponent is fixed at -10. Suggested value shown for 1.2Vo. Should be changed for different output voltage. Values can be 108%, 110%, 112% or 115% of output voltage Format Linear, two’s complement binary Bit Position 7 6 5 4 3 2 1 0 Access r r/w r/w r/w r/w r/w r/w r/w Function High Byte Default Value 0 0 0 0 0 1 0 1 Bit Position 7 6 5 4 3 2 1 0 Access r/w r/w r/w r/w r/w r/w r/w r/w Function Low Byte Default Value 0 1 1 0 0 0 0 0 YES

41 VOUT_OV_FAULT_RESPONSE

Instructs the module on what action to take in response to a output overvoltage fault Format Unsigned Binary Bit Position 7 6 5 4 3 2 1 0 Access r/w r/w r/w r/w r/w r r r Function RSP [1] RSP [0] RS[2] RS[1] RS[0] X X X Default Value 1 1 1 1 1 1 0 0 YES

44 VOUT_UV_FAULT_LIMIT

Sets the voltage level for an output undervoltage fault. Exponent is fixed at -10. Suggested value shown for 1.2Vo. Should be changed for different output voltage. Values can be 92%, 90%, 88% or 85% of output voltage Format Linear, two’s complement binary Bit Position 7 6 5 4 3 2 1 0 Access r r/w r/w r/w r/w r/w r/w r/w Function High Byte Default Value 0 0 0 0 0 1 0 0 Bit Position 7 6 5 4 3 2 1 0 Access r/w r/w r/w r/w r/w r/w r/w r/w Function Low Byte Default Value 0 0 1 1 1 0 0 1 YES

45 VOUT_UV_FAULT_RESPONSE

Instructs the module on what action to take in response to a output undervoltage fault Format Unsigned Binary Bit Position 7 6 5 4 3 2 1 0 Access r/w r/w r/w r/w r/w r r r Function RSP [1] RSP [0] RS[2] RS[1] RS[0] X X X Default Value 0 0 0 0 0 1 0 0 YES

46 IOUT_OC_FAULT_LIMIT

Sets the output overcurrent fault level in A (cannot be changed) Format Linear, two’s complement binary Bit Position 7 6 5 4 3 2 1 0 Access r r r r r r r r Function Exponent Mantissa Default Value 1 1 1 1 1 0 0 0 Bit Position 7 6 5 4 3 2 1 0 Access r r r r r r r R Function Mantissa Default Value 0 0 0 0 1 1 0 0 YES 4A IOUT_OC_WARN_LIMIT Sets the output overcurrent warning level in A Format Linear, two’s complement binary Bit Position 7 6 5 4 3 2 1 0 Access r r r r r r r r Function Exponent Mantissa Default Value 1 1 1 1 1 0 0 0 Bit Position 7 6 5 4 3 2 1 0 Access r r r/w r/w r/w r/w r/w r/w Function Mantissa Default Value 0 0 0 0 1 0 1 0 YES 5E POWER_GOOD_ON Sets the output voltage level at which the PGOOD pin is asserted high Format Linear, two’s complement binary Bit Position 7 6 5 4 3 2 1 0 Access r r/w r/w r/w r/w r/w r/w r/w Function High Byte Default Value 0 0 0 0 0 1 0 0 Bit Position 7 6 5 4 3 2 1 0 Access r/w r/w r/w r/w r/w r/w r/w r/w Function Low Byte Default Value 0 1 1 0 1 0 1 0 YES

+86 755 298 85888 Europe, Middle East +353 61 225 977 North America +1 408 785 5200 © 2019 Bel Power Solutions & Protection Rev. D1.04.19 Hex Code Command Brief Description Non-Volatile Memory Storage 5F POWER_GOOD_OFF Sets the output voltage level at which the PGOOD pin is de-asserted low Format Linear, two’s complement binary Bit Position 7 6 5 4 3 2 1 0 Access r r/w r/w r/w r/w r/w r/w r/w Function High Byte Default Value 0 0 0 0 0 1 0 0 Bit Position 7 6 5 4 3 2 1 0 Access r/w r/w r/w r/w r/w r/w r/w r/w Function Low Byte Default Value 0 1 0 1 0 0 1 0 YES

61 TON_RISE

Sets the rise time of the output voltage during startup Format Linear, two’s complement binary Bit Position 7 6 5 4 3 2 1 0 Access r r r r r r r r/w Function Exponent Mantissa Default Value 1 1 1 0 0 0 0 0 Bit Position 7 6 5 4 3 2 1 0 Access r/w r/w r/w r/w r/w r/w r/w r/w Function Mantissa Default Value 0 0 1 0 1 0 1 0 YES

78 STATUS_BYTE

Returns one byte of information with a summary of the most critical module faults Format Unsigned Binary Bit Position 7 6 5 4 3 2 1 0 Access r r r r r r r r Flag X OFF VOUT_ OV IOUT_ OC VIN_U V TEMP CML OTHE R Default Value 0 0 0 0 0 0 0 0

79 STATUS_WORD

Returns two bytes of information with a summary of the module’s fault/warning conditions Format Unsigned Binary Bit Position 7 6 5 4 3 2 1 0 Access r r r r r r r r Flag VOUT IOUT_ OC X X PGOO D X X X Default Value 0 0 0 0 0 0 0 0 Bit Position 7 6 5 4 3 2 1 0 Access r r r r r r r r Flag X OFF VOUT_ OV IOUT_ OC VIN_U V TEMP CML OTHE R Default Value 0 0 0 0 0 0 0 0 7A STATUS_VOUT Returns one byte of information with the status of the module’s output voltage related faults Format Unsigned Binary Bit Position 7 6 5 4 3 2 1 0 Access r r r r r r r r Flag VOUT_OV X X VOUT_UV X X X X Default Value 0 0 0 0 0 0 0 0 7B STATUS_IOUT Returns one byte of information with the status of the module’s output current related faults Format Unsigned Binary Bit Position 7 6 5 4 3 2 1 0 Access r r r r r r r r Flag IOUT_OC X IOUT_OC_WARN X X X X X Default Value 0 0 0 0 0 0 0 0

+86 755 298 85888 Europe, Middle East +353 61 225 977 North America +1 408 785 5200 © 2019 Bel Power Solutions & Protection Rev. D1.04.19 Hex Code Command Brief Description Non-Volatile Memory Storage 7D STATUS_TEMPERATURE Returns one byte of information with the status of the module’s temperature related faults Format Unsigned Binary Bit Position 7 6 5 4 3 2 1 0 Access r r r r r r r R Flag OT_FAULT OT_WARN X X X X X X Default Value 0 0 0 0 0 0 0 0 7E STATUS_CML Returns one byte of information with the status of the module’s communication related faults Format Unsigned Binary Bit Position 7 6 5 4 3 2 1 0 Access r r r r r r r r Flag Invalid Command Invalid Data PEC Fail X X X Other Comm Fault X Default Value 0 0 0 0 0 0 0 0

88 READ_VIN

Returns the value of the input voltage applied to the module Format Linear, two’s complement binary Bit Position 7 6 5 4 3 2 1 0 Access r r r r r r r r Function Exponent Mantissa Default Value 1 1 0 1 1 0 0 0 Bit Position 7 6 5 4 3 2 1 0 Access r r r r r r r r Function Mantissa Default Value 0 0 0 0 0 0 0 0 8B READ_VOUT Returns the value of the output voltage of the module Format Linear, two’s complement binary Bit Position 7 6 5 4 3 2 1 0 Access r r r r r r r r Function Mantissa Default Value 0 0 0 0 0 0 0 0 Bit Position 7 6 5 4 3 2 1 0 Access r r r r r r r r Function Mantissa Default Value 0 0 0 0 0 0 0 0 8C READ_IOUT Returns the value of the output current of the module Format Linear, two’s complement binary Bit Position 7 6 5 4 3 2 1 0 Access r r r r r r r r Function Exponent Mantissa Default Value 1 1 1 0 0 0 0 0 Bit Position 7 6 5 4 3 2 1 0 Access r r r r r r r r Function Mantissa Default Value 0 0 0 0 0 0 0 0

98 POWER MANAGEMENT

BUS_REVISION Returns one byte indicating the module is compliant to Power Management Bus Spec. 1.1 (read only) Format Unsigned Binary Bit Position 7 6 5 4 3 2 1 0 Access r r r r r r r r YES

+86 755 298 85888 Europe, Middle East +353 61 225 977 North America +1 408 785 5200 © 2019 Bel Power Solutions & Protection Rev. D1.04.19 Default Value 0 0 0 1 0 0 0 1 Hex Code Command Brief Description Non-Volatile Memory Storage A0 MFR_VIN_MIN Returns the minimum input voltage the module is specified to operate at (read only) Format Linear, two’s complement binary Bit Position 7 6 5 4 3 2 1 0 Access r r r r r r r r Function Exponent Mantissa Default Value 1 1 1 1 0 0 0 0 Bit Position 7 6 5 4 3 2 1 0 Access r r r r r r r r Function Mantissa Default Value 0 0 0 0 1 1 0 0 YES A4 MFR_VOUT_MIN Returns the minimum output voltage possible from the module (read only) Format Linear, two’s complement binary Bit Position 7 6 5 4 3 2 1 0 Access r r r r r r r r Function Mantissa Default Value 0 0 0 0 0 0 1 0 Bit Position 7 6 5 4 3 2 1 0 Access r r r r r r r r Function Mantissa Default Value 0 1 1 0 0 1 1 0 YES D0 MFR_SPECIFIC_00 Returns module name information (read only) Format Unsigned Binary Bit Position 7 6 5 4 3 2 1 0 Access r r r r r r r r Function Reserved Default Value 0 0 0 0 0 0 0 0 Bit Position 7 6 5 4 3 2 1 0 Access r r r r r r r r Function Module Name Reserved Default Value 0 0 1 0 0 0 1 0 YES D4 VOUT_CAL_OFFSET Applies an offset to the READ_VOUT command results to calibrate out offset errors in module measurements of the output voltage (between -125mV and +124mV) Format Linear, two’s complement binary Bit Position 7 6 5 4 3 2 1 0 Access r/w r r r r r r r Function Mantissa Default Value V 0 0 0 0 0 0 0 Bit Position 7 6 5 4 3 2 1 0 Access r r/w r/w r/w r/w r/w r/w r/w Function Mantissa Default Value V V V V V V V V YES D5 VOUT_CAL_GAIN Applies a gain correction to the READ_VOUT command results to calibrate out gain errors in module measurements of the output voltage (between -0.125 and 0.121) Format Linear, two’s complement binary Bit Position 7 6 5 4 3 2 1 0 Access r r r r r r/w r r Function Exponent Mantissa Default Value 1 1 0 0 0 0 0 V Bit Position 7 6 5 4 3 2 1 0 Access r r r r/w r/w r/w r/w r/w Function Mantissa Default Value V V V V V V V V YES

+86 755 298 85888 Europe, Middle East +353 61 225 977 North America +1 408 785 5200 © 2019 Bel Power Solutions & Protection Rev. D1.04.19 Hex Code Command Brief Description Non-Volatile Memory Storage D6 VIN_CAL_OFFSET Applies an offset correction to the READ_VIN command results to calibrate out offset errors in module measurements of the input voltage (between -2V and +1.968V) Format Linear, two’s complement binary Bit Position 7 6 5 4 3 2 1 0 Access r r r r r r/w r r Function Exponent Mantissa Default Value 1 1 0 1 V 0 0 V Bit Position 7 6 5 4 3 2 1 0 Access r r r/w r/w r/w r/w r/w r/w Function Mantissa Default Value 0 0 V V V V V V YES D7 VIN_CAL_GAIN Applies a gain correction to the READ_VIN command results to calibrate out gain errors in module measurements of the input voltage (between -0.125 and 0.121) Format Linear, two’s complement binary Bit Position 7 6 5 4 3 2 1 0 Access r r r r r r/w r r Function Exponent Mantissa Default Value 1 1 0 0 V 0 0 V Bit Position 7 6 5 4 3 2 1 0 Access r r r r/w r/w r/w r/w r/w Function Mantissa Default Value 0 0 0 V V V V V YES

+86 755 298 85888 Europe, Middle East +353 61 225 977 North America +1 408 785 5200 © 2019 Bel Power Solutions & Protection Rev. D1.04.19 Requirements: Vin: 12V Vout: 1.8V Iout: 2.25A max., worst case load transient is from 1.5A to 2.25A Vout: 1.5% of Vout (27mV) for worst case load transient Vin, ripple 1.5% of Vin (180mV, p-p) CI1 Decoupling cap - 1x0.047 F/16V ceramic capacitor (e.g. Murata LLL185R71C473MA01) CI2 1x22 F/16V ceramic capacitor (e.g. Murata GRM32ER61C226KE20) CI3 470 F/16V bulk electrolytic CO1 Decoupling cap - 1x0.047 F/16V ceramic capacitor (e.g. Murata LLL185R71C473MA01) CO2 - CO3 1x330uF CTune 2200pF ceramic capacitor (can be 1206, 0805 or 0603 size) RTune 220 ohms SMT resistor (can be 1206, 0805 or 0603 size) RTrim 10k SMT resistor (can be 1206, 0805 or 0603 size, recommended tolerance of 0.1%) Note: The DATA, CLK and SMBALRT pins do not have any pull-up resistors inside the module. Typically, the SMBus master controller will have the pull-up resistors as well as provide the driving source for these signals. RADDR0 DATA VS- RADDR1 GND Vin+ CI3 CO3 ADDR0 VOUT VS+ GND TRIM CTUNE RTUNE RTrim VIN CO1 CI1 Vout+ ON/OFF SEQ SMBALRT# MODULE PGOOD ADDR1 SIG_GND SYNC CI2 CO2 CLK

+86 755 298 85888 Europe, Middle East +353 61 225 977 North America +1 408 785 5200 © 2019 Bel Power Solutions & Protection Rev. D1.04.19 Dimensions are in millimeters and (inches). PIN FUNCTION PIN FUNCTION

1 ON/OFF 10 PGOOD

2 VIN 11 SYNC1

3 GND 12 VS-

4 VOUT 13 SIG. GND

5 VS+ (SENSE) 14 SMBALERT

6 TRIM 15 DATA

7 GND 16 ADDR0

8 CLK 17 ADDR1

9 SEQ

1 If unused, connect to Ground.

+86 755 298 85888 Europe, Middle East +353 61 225 977 North America +1 408 785 5200 © 2019 Bel Power Solutions & Protection Rev. D1.04.19 The SLDN-03D1Ax modules are supplied in tape & reel as standard. All Dimensions are in millimeters and (in inches). Reel Dimensions: Outside Dimensions: 330.2 mm (13.00) Inside Dimensions: 177.8 mm (7.00”) Tape Width: 24.00 mm (0.945”)

+86 755 298 85888 Europe, Middle East +353 61 225 977 North America +1 408 785 5200 © 2019 Bel Power Solutions & Protection Rev. D1.04.19 The SLDN-03D1Ax modules use an open frame construction and are designed for a fully automated assembly process. The modules are fitted with a label designed to provide a large surface area for pick and place operations. The label meets all the requirements for surface mount processing, as well as safety standards, and is able to withstand reflow temperatures of up to 300oC. The labe l also carries product information such as product code, serial number and the location of manufacture. The weight has been kept to a minimum by using open frame construction. Variables such as nozzle size, tip style, vacuum pres sure and placement speed should be considered to optimize this process. The minimum recommended inside nozzle diameter for reliable operation is 3mm. The maximum nozzle outer diameter, which will safely fit within the allowable component spacing, is 7 mm. This SLDN -03D1Ax module is not recommended for assembly on the bottom side of a customer board. If such an assembly is attempted, components may fall off the module during the second reflow process. The SLDN-03D1Ax modules are lead-free (Pb-free) and RoHS compliant and are both forward and backward compatible in a Pb-free and a SnPb soldering process. Failure to observe the instructions below may result in the failure of or cause damage to the modules and can adversely affect long-term reliability. Power Systems will comply with J -STD-020 Rev. C (Mo isture/Reflow Sensitivity Classification for Nonhermetic Solid State Surface Mount Devices) for both Pb-free solder profiles and MSL classification procedures. This standard provides a recommended forced - air-convection reflow profile based on the volume a nd thickness of the package (table 5 -2). The suggested Pb -free solder paste is Sn/Ag/Cu (SAC). The recommended linear reflow profile using Sn/Ag/Cu solder is shown in Fig. 51. Soldering outside of the recommended profile requires testing to verify results and performance. It is recommended that the pad layout include a test pad where the output pin is in the ground plane. The thermocouple should be attached to this test pad since this will be the coolest solder joints. The temperature of this point should be: Maximum peak temperature is 260 C. Minimum temperature is 235 C. Dwell time above 217 C: 60 seconds minimum Dwell time above 235 C: 5 to 15 second The SLDN-03D1Ax modules have a MSL rating of 2A. Post solder cleaning is usually the final circuit -board assembly process prior to electrical board testing. The result of inadequate cleaning and drying can affect both the reliability of a power module and the testability of the finished ci rcuit-board assembly. For guidance on appropriate soldering, cleaning and drying procedures, refer to Board Mounted Power Modules: Soldering and Cleaning

(MBB) with desiccant are required for MSL ratings of 2 or greater. These sealed packages should not be broken until time of use. date, when stored at the following conditions: < 40° C, < 90% relative humidity. Figure 51. Recommended linear reflow profile using Sn/Ag/Cu solder.

+86 755 298 85888 Europe, Middle East +353 61 225 977 North America +1 408 785 5200 © 2019 Bel Power Solutions & Protection Rev. D1.04.19 DATE REVISION CHANGES DETAIL APPROVAL 2012-03-20 A First release HL LU 2012-05-03 B Adding the patent info. HL LU 2015-7-2 C Update part selection, output specifications, general specifications, safety considerations, analog voltage margining, output voltage adjustment using the Power Management Bus, Power Management Bus adjustable overcurrent warning, Power Management Bus adjustable input undervoltage lockout, measuring output current using the Power Management Bus, summary of supported Power Management Bus commands, thermal considerations, example application circuit, packaging details, MSL rating. XF Jiang 2019-Jan-20 D Updated to the latest Bel template. Disclaimer: Power Management Bus is a registered trademark of SMIF, Inc. added NUCLEAR AND MEDICAL APPLICATIONS - Products are not designed or intended for use as critical components in life support systems, equipment used in hazardous environments, or nuclear control systems. TECHNICAL REVISIONS - The appearance of products, including safety agency certifications pictured on labels, may change depending on the date manufactured. Specifications are subject to change without notice.

Product Information

SLDN-03D1A0 specifications and overview.

Summary

3 VDC ??14.4 VDC Input,

Description

3 VDC ??14.4 VDC Input,

Source title SLDN-03D1A0 Datasheet(PDF) - Bel Fuse Inc.

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