LSO28

LSO28_15 IRF | Alldatasheet

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The LSO Series of DC-DC converters are, high reliability devices designed for hostile radiation hardened environments. The design is based on the heritage-rich LS Series with enhanced functional performance and an inclusion of an output overvoltage protection. The LSO Series provide up to 30 watts output power, small size, low weight, integrated EMI filtering and a high tolerance to environmental stresses such as radiation, temperature extremes, mechanical shock, and vibration. All components are fully de-rated to meet the requirements of MIL-STD-1547, MIL-STD-975 and NASA EEE-INST- 002. Extensive documentation including, thermal analysis, stress analysis and reliability predictions are available. The LSO Series of converters incorporate a fixed frequency single forward topology with magnetic feedback and an internal EMI filter. These converters are capable of meeting the conducted emissions requirements of MIL-STD-461C without any additional components. All models include an external inhibit port and have an adjustable output voltage. The converters are overload, short circuit and output over-voltage protected. They are enclosed in a hermetic 3.5" x 2.5" x 0.475" H steel package and weigh less than 125 grams. The package utilizes rugged ceramic feed-through copper core pins and is sealed using parallel seam welding. Variations in electrical specifications and screening to meet custom requirements can be accommodated. /G110Geo Synchronous Satellite /G110Low Earth Orbit /G110Deep Space Probe /G110Communication and Display Systems /G110Payload and Experiment LVPS LSO SERIES 28V Input, Single/Dual Output HYBRID-HIGH RELIABILITY RADIATION HARDENED DC-DC CONVERTER Manufactured in a facility fully qualified to MIL-PRF- 38534, these converters are fabricated utilizing DLA qualified processes. For available screening options, refer to device screening table in the data sheet. LSO PD-97812

2 www.irf.com LSO SERIES 28V Input, Single/Dual Output The LSO Series converters utilize a single-ended forward topology with resonant reset. The nominal switching frequency is 500KHz. Electrical isolation and tight output regulation are achieved through the use of a magnetically coupled feedback. Voltage feed-forward with duty factor limiting provides high line rejection. Circuit Description An internal EMI filter allows the converter to meet the conducted emissions requirements of MIL-STD- 461C on the input power leads. Inhibit (On/Off Command) : An external inhibit port is provided to control converter operation. The converter’s operation is inhibited when this pin is pulled low. It is intended to be driven by an open collector logic device. The pin may be left open for normal operation and has a nominal open circuit voltage of 4V with respect to the inhibit return (Pin 4). Short Circuit and Overload Protection: Output current is limited under any load fault condition to approximately 125% of rated. An overload condition causes the converter output voltage to drop below nominal. The converter will resume normal operation when the load current is reduced below the current limit point. This protects the converter from both overload and short circuit conditions. The current limit point exhibits a slightly negative temperature coefficient to reduce the possibility of thermal runaway. Input Undervoltage Lockout (UVLO) and Undervoltage Release (UVR): The converter is designed to be protected against an undervoltage condition. The converter will be in a non-functional (UVLO) mode when the input voltage is pproximately 15.5V or less. The converter will turn on when the input voltage rises to 15.5V to 17.9V (defined as UVR threshold) and will provide a regulated output as the input voltage reaches 18V. Should the input voltage drops below 16.5V to 14.5V (defined as UVLO threshold), the converter will turn off and remains off so long as the input voltage remains under the UVLO threshold. The converter will resume a normal operation when the input line rises above the UVR threshold. However, the converter can be configured to remain in a latch-up mode if desired. Functional Notes Input Current Telemetry:/G32 The LSO Series single and dual output models also feature an input current telemetry with a magnitude of 0 to 3.3V full scale. The voltage signal at this pin (Pin 7) with respect to Output Return (Pin 12) is equal to 1.5 times the input current (Vin TLM (V) =1.5 *Input Current (A)+/-0.1V) Output Overvoltage Protection/G58 The converter also features an output over-voltage protection. One OVP circuitry for each output for the dual output models. In an event the voltage output exceeds a preset voltage threshold of approximately 120 +/- 5% of nominal voltage output, the converter will turn off. The input power to the converter or the signal at the Inhibit pin must be recycled (connecting and removing the Inhibit pin to/from Inhibit Return pin) to turn on the converter. This event is possible only if the converter shuts off due to a false triggering. The OVP threshold voltage can also be reset to within 115% to 125% of nominal output voltage with two external resistors. Refer to the Application Notes section of the data sheet on page 9. To take advantage of the latch-up feature, the U/V Latch Pin (Pin 5) should be shorted (with less than 100 ohms) to the Inhibit Return Pin (Pin 4). Note that in this mode the converter will latch off if an undervoltage condition lasts more than 1milli-sec. The converter is reset by a shorted Enable Input pin command followed by an open Enable Input pin command. Output Voltage Adjustment: The output voltage of all models can be adjusted greater or less than the nominal output voltage using a single external resistor. Refer to the Application Notes section of the data sheet on page 9.

www.irf.com 3 LSO SERIES 28V Input, Single/Dual Output Design Methodology The LSO Series was developed using a proven conservative design methodology derived from other space level designs that includes selection of established reliability components and fully derating to the requirements of MIL-STD-1547, MIL-PRF-975 and NASA EEE-INST-002 except for the CDR type ceramic capacitors, a capacitor with 50V rating is used for in-circuit voltage stress of less than 10V. A magnetic feedback circuit is utilized instead of opto -couplers to minimize temperature, aging and radiation sensitivity. PSPICE was used extensively to predict and optimize circuit performance for both beginning and end-of-life. Thorough design analyses include stress, thermal, and reliability (MTBF).

4 www.irf.com LSO SERIES 28V Input, Single/Dual Output Electrical Performance Characteristics For Notes to Electrical Performance Characteristics, refer to page 7 1. Meets MIL-STD-1547, MIL-STD-975 and NASA EEE-INST-002 up to the input voltage at 38.6V. Input voltage range -0.5Vdc to +60Vdc Input voltage range1 +18Vdc to +40Vdc Output power Internally limited Output power 0 to Max. Rated Lead temperature +300°C for 10 seconds Operating case temperature -55°C to +85°C Operating case temperature -55°C to +125°C (Note 13) Operating case temperature -55°C to +70°C Storage temperature -55°C to +135°C Recommended Operating Conditions Absolute Maximum Ratings Limits Parameter Group A Subgroup Conditions -55°C ≤ TC ≤ +85°C VIN = 28V DC ± 5%, CL = 0 unless otherwise specified Min Nom Max Unit Input Voltage 18 28 40 V Output Voltage ( VOUT ) LSO2801R5S LSO2801R8S LSO2802R5S LSO2803R3S LSO2805S LSO2812S LSO2815S LSO2805D LSO2812D LSO2815D LSO2801R5S LSO2801R8S LSO2802R5S LSO2803R3S LSO2805S LSO2812S LSO2815S LSO2805D LSO2812D LSO2815D 2,3 2,3 2,3 2,3 2,3 2,3 2,3 2,3 2,3 2,3 I OUT = 100% rated load Note 4 IOUT = 100% rated load Notes 4, 13 1.47 1.77 2.47 3.27 4.95 11.88 14.85 ±4.95 ±11.88 ±14.85 1.43 1.73 2.43 3.23 4.90 11.76 14.70 ±4.90 ±11.76 ±14.70 1.50 1.80 2.50 3.30 5.00 12.00 15.00 ±5.00 ±12.00 ±15.00 1.53 1.83 2.53 3.33 5.05 12.12 15.15 ±5.05 ±12.12 ±15.15 1.57 1.87 2.57 3.37 5.10 12.24 15.30 ±5.10 ±12.24 ±15.30 V V Output power ( POUT ) LSO2801R5S LSO2801R8S LSO2802R5S LSO2803R3S All Others 1,2,3 V IN = 18, 28, 40 Volts, Note 2 14.4 W Output current ( IOUT ) LSO2801R5S LSO2801R8S LSO2802R5S LSO2803R3S LSO2805S LSO2812S LSO2815S LSO2805D LSO2812D LSO2815D 1,2,3 V IN = 18, 28, 40 Volts, Note 2 Either Output, Note 3 Either Output, Note 3 Either Output, Note 3 8.0 8.0 8.0 7.57 6.0 2.5 2.0 4.8 2.3 1.6 A

www.irf.com 5 LSO SERIES 28V Input, Single/Dual Output Electrical Performance Characteristics (continued) For Notes to Electrical Performance Characteristics, refer to page 7 Limits Parameter Group A Subgroup Conditions -55°C ≤ TC ≤ +85°C VIN = 28V DC ± 5%, CL = 0 unless otherwise specified Min Nom Max Unit Line regulation ( VRLINE ) All Single and Dual Output Models 1,2,3 VIN = 18, 28, 40 Volts IOUT = 0, 50%, 100% rated, Note 4 -0.5 0.5 Load regulation ( VRLOAD ) All Single Output Models 1,2,3 VIN = 18, 28, 40 Volts IOUT = 0, 50%, 100% rated, Note 4 -1.0 1.0 Total regulation ( Line and Load ) 1,2,3 VIN = 18 to 40 Volts Min load to full load Dual model is measured from +Output to –Output, Note 13 -1.0 1.0 Cross regulation (VRCROSS ) LSO2805D LSO2812D LSO2815D 1,2,3 VIN = 18, 28, 40 Volts Duals only, Note 5 -5.0 -3.0 -3.0 5.0 3.0 3.0 Input Current, no load (IIN ) LSO2801R5S LSO2801R8S LSO2802R5S LSO2803R3S LSO2805S LSO2812S LSO2815S LSO2805D LSO2812D LSO2815D 1,2,3 I OUT = 0, Pin 3 open 100 100 mA Input current inhibited 1,2,3 Pin 4 shorted to Pin 3 8.0 mA Output Ripple (VRIP) LSO2801R5S LSO2801R8S LSO2802R5S LSO2803R3S LSO2805S LSO2812S LSO2815S LSO2805D LSO2812D LSO2815D 1,2,3 V IN = 18, 28, 40 Volts IOUT = 100% rated load Notes 4, 6 mV p-p Switching frequency (FS ) 1,2,3 425 500 575 KHz Efficiency (EFF ) LSO2801R5S LSO2801R8S LSO2802R5S LSO2803R3S LSO2805S LSO2812S LSO2815S LSO2805D LSO2812D LSO2815D 1,2,3 I OUT = 100% rated load Note 4 Input undervoltage lockout (UVLO) (turn off when input voltage decreassing) 1,2,3 No load to full load, Notes 1, 4 14.5 16.5 V Input undervoltage release (UVR) (turn on when input voltage rising) 1,2,3 No load to full load, Notes 1, 4 15.5 17.9 V Input undervoltage Hysteresis (UVR-UVLO) 1,2,3 No load to full load, Notes 1, 4 1.0 3.0 V Input current telemetry ratio( ICT) 1,2,3 IOUT = 100% rated load, Note 4 1.4 1.6 V/A

6 www.irf.com LSO SERIES 28V Input, Single/Dual Output Electrical Performance Characteristics (continued) For Notes to Electrical Performance Characteristics, refer to page 7 Limits Parameter Group A Subgroup Conditions -55°C ≤ TC ≤ +85°C VIN = 28V DC ± 5%, CL = 0 unless otherwise specified Min Nom Max Unit Overvoltage protection (OVP) Output voltage threshold (for single and each of dual output models) 1,2,3 No load to full load, Notes 1, 4 115 125 % of nominal Vout Enable Input ( Inhibit Function ) open circuit voltage drive current ( sink ) voltage range Note 1 3.0 -0.5 5.0 5.0 V mA V Current Limit Point Expressed as a percentage of full rated load current 1,2,3 V OUT = 90% of Nominal, Note 4 105 145 Power dissipation, load fault (PD ) 1,2,3 Short Circuit, Overload, Note 8 16 W Output response to step load changes (VTLD ) 4,5,6 Half Load to/from Full Load, Notes 4,9 -300 300 mV pk Recovery time, step load changes (TTLD ) 4,5,6 Half Load to/from Full Load, Notes 4,9,10 200 µs Output response to step line changes (VTLN ) 18V to/from 40V IOUT = 100% rated load, Notes 1,4,11 -300 300 mV pk Recovery Time, step line changes (TTLN ) 18V to/from 40V IOUT = 100% rated load, Notes 1, 4,10,11 200 µs Turn-on Overshoot (VOS ) All Single and Dual Output Models Turn-on Delay ( TDLY ) All Single and Dual Output Models 4,5,6 10% Load, Full Load Notes 4,12 mV ms Capacitive Load (CL ) LSO2801R5S LSO2801R8S LSO2802R5S LSO2803R3S LSO2805S LSO2812S LSO2815S LSO2805D LSO2812D LSO2815D I OUT = 100% rated load No effect on DC performance Notes 1, 4, 7 Each output on duals 2500 2500 2500 2200 1000 180 120 500 µF Line Rejection 1 IOUT = 100% rated load DC to 50KHz, Notes 1, 4 40 50 dB Isolation 1 Input to Output or Any Pin to Case except Pin 6, test @ 100VDC 20 MΩ Device Weight 125 g MTBF MIL-HDBK-217F2, SF, 35°C Note 14 4.0 x 106 Hr

www.irf.com 7 LSO SERIES 28V Input, Single/Dual Output Notes for Electrical Performance Characteristics Table 1. Parameter is tested as part of design characterization or after design changes. Thereafter, parameter shall be guaranteed to the limits specified. 2. Parameter verified during line and load regulation tests. 3. Output load current must be distributed such that at least 20% of the total load current is being provided by one of the outputs. 4. Load current split equally between outputs on dual output models. 5. Cross regulation is measured with 20% rated load on output under test while changing the load on the other output from 20% to 80% of rated. 6. Guaranteed for a D.C. to 20MHz bandwidth. Tested using a 20KHz to 10MHz bandwidth using the circuit shown in Fig.1. 7. Capacitive load may be any value from 0 to the maximum limit without compromising dc performance. For a capacitive load in excess of the maximum limit, consult the factory. 8. Overload power dissipation is defined as the device power dissipation with the load set such that V OUT = 90% of nominal. 9. Load step transition time ≤ 10µs. 10. Recovery time is measured from the initiation of the transient to where V OUT has returned to within ±1% of its steady state value. 11. Line step transition time ≤ 100µs. 12. Turn-on delay time from either a step application of input power or a logic low to a logic high transition on the inhibit pin (pin 3) to the point where V OUT = 90% of nominal. 13. End of ife (EOL) is /G177/G51% 14. MIL-HDBK MOSFET failure rates replaced by empirical failure rate data supplied by Intenational Rectifier. Radiation Performance Characteristics Fig. 1 - Circuit for measuring Output Ripple Voltage /c14 /c50 /c88/c87 /c83/c88/c87 /c39/c56/c55 /c53/c72 /c87 /c88 /c85 /c81 50 Ω 0.1 Fµ 1 Fµ /c50 /c86 /c70/c76 /c79 /c79 /c82 /c86 /c70/c82/c83 /c72 /c3 /c82/c85 /c3 /c72 /c84 /c88 /c76 /c89/c68 /c79 /c72 /c81 /c87 /c3 /c90 /c76 /c87 /c75 /c3/c20/c19 /c3/c48 /c43 /c93 /c3 /c69/c68/c81 /c71/c90 /c76 /c71/c87 /c75 /c15/c3 /c80/c88/c79 /c87 /c76 /c83 /c79 /c92/c3/c85 /c72/c68/c71/c76 /c81 /c74/c3/c69 /c92 /c3 /c21 /c17 50Ω Coax /c53 /c47 /c73/c82 /c85/c3/c44 /c53/c36 /c55/c40/c39 50 Ω Termination Test Inspection Method Min Typ Unit MIL-PRF-883, Method 1019 Total Ionizing Dose (Gamma) Operating bias applied during exposure, 100 150 Krads(Si) Full Rated Load, VIN = 28V Heavy Ions (LET) Single Event Effects Operating bias applied during exposure, SEU, SEL, SEGR, SEB Full Rated Load, VIN = 28V 82 MeV/c120 cm2/mg Test lab: Cyclotron Institute Texas A & M University

8 www.irf.com LSO SERIES 28V Input, Single/Dual Output Fig. 2 - Single Output Block Diagram Fig. 3 - Dual Output Block Diagram 13/c44/c81/c83 /c88/c87 /c44 /c81 /c75/c76 /c69/c76 /c87 /c44/c81/c83 /c88/c87 /c53/c72 /c87 /c88 /c85 /c81 /c14/c50/c88/c87 /c83/c88/c87 /c14/c20/c21 /c57 /c38/c68 /c86 /c72 /c3 /c42/c85/c82/c88/c81 /c71 /c14/c54/c72/c81 /c86/c72 /c50/c88/c87/c83 /c88/c87 /c3 /c36/c71/c77/c88/c86/c87 /c14/c27 /c57 /c56/c18/c57 /c47/c68 /c87/c70/c75 /c14/c23 /c17/c23/c57 /c44/c81/c83 /c88/c87/c3 /c38/c88 /c85/c85 /c72 /c81 /c87 /c55 /c72 /c79/c72/c80/c72/c87/c85/c92 /c51/c58 /c48 /c14/c24 /c57 /c14/c24/c57 /c14/c20/c21 /c57 /c16/c54/c72 /c81 /c86 /c72 /c44/c81/c75 /c76/c69/c76/c87/c3 /c53/c72/c87/c88 /c85 /c81 /c50/c57/c51/c3 /c36/c71/c77 4.4V Reg Bus Current Telemetry Overcurrent Protection Bias Supply OVP EMI Filter UVLO & Inhibit Shutdown Latch Oscillator Ramp Gen. Feedback Trigger Sample & Hold Soft Start Ref & S.S. FET Driver 12 /c16/c50 /c88 /c87 /c83 /c88 /c87 Error Amplifier LSO28XXS /c50/c88 /c87 /c83/c88 /c87 /c3 /c36/c71/c77 /c88/c86/c87 /c14/c27/c57 /c14/c23 /c17 /c23 /c57 /c16 /c50 /c88/c87 /c83/c88 /c87 /c51/c58 /c48 /c14/c24 /c57 /c14/c20/c21/c57 /c16/c50 /c88 /c87 /c14/c50/c88 /c87 /c50/c88 /c87 /c83/c88 /c87 /c53/c72 /c87 /c88 /c85 /c81/c14/c20 /c21 /c57 /c14/c24 /c57 /c44/c81 /c83/c88/c87/c3 /c38 /c88/c85/c85/c72 /c81/c87 /c55/c72 /c79 /c72 /c80 /c72/c87 /c85 /c92 /c14/c50 /c57 /c51 /c3/c36 /c71 /c77 /c16/c50 /c57 /c51 /c3/c36 /c71 /c77 EMI Filter UVLO & Inhibit Bias Supply Shutdown Latch FET Driver Oscillator Ramp Gen. Sample & Hold Soft Start Feedback Trigger Bus Current Telemetry Overcurrent Protection 4.4V Reg Error Amplifier Ref & S.S. -Out OVP +Out OVP Reg /c44/c81 /c83/c88/c87 /c44/c81 /c75/c76 /c69/c76 /c87 /c44/c81 /c83/c88/c87 /c53/c72 /c87 /c88 /c85 /c81 /c38/c68 /c86 /c72 /c3 /c42/c85/c82 /c88/c81/c71 /c56/c18 /c57 /c47/c68 /c87 /c70/c75 /c44/c81 /c75/c76 /c69 /c76 /c87 /c3 /c53/c72/c87 /c88/c85 /c81 13 /c14 /c50 /c88/c87/c83/c88/c87 LSO28XXD

www.irf.com 9 LSO SERIES 28V Input, Single/Dual Output Fig. 4 - Typical Connections Diagram /c20/c22 /c20/c19 /c28 /c14 /c50 /c88/c87 /c83/c88/c87 /c47/c54 /c50 /c21 /c27 /c59/c59 /c54 /c16/c50 /c88/c87 /c83/c88/c87 /c14/c54 /c72 /c81 /c86/c72 /c21 /c24 /c23 /c22 /c20 /c16/c54 /c72 /c81 /c86 /c72 /c14 /c3 /c44/c81/c83/c88/c87 /c56/c18 /c57/c3 /c47 /c68/c87 /c70/c75 /c44/c81/c75/c76 /c69/c76 /c87 /c44/c81/c75/c76 /c69/c76 /c87 /c3 /c53 /c87 /c81 /c44/c81/c83/c88/c87 /c3/c53 /c87 /c81 /c14/c3 /c16/c21/c27/c57 /c20/c22 /c20/c21 /c20/c20 /c14 /c50 /c88/c87 /c83/c88/c87 /c53/c72 /c87 /c88 /c85 /c81/c47/c54 /c50 /c21 /c27 /c59/c59 /c39 /c21 /c24 /c23 /c22 /c20 /c16 /c50 /c88/c87 /c83/c88/c87 /c14 /c3 /c44 /c81/c83/c88 /c87 /c56/c18 /c57 /c3 /c47 /c68 /c87 /c70 /c75 /c44/c81/c75/c76 /c69/c76 /c87 /c44/c81/c75/c76 /c69/c76 /c87 /c3 /c53 /c87 /c81 /c44/c81/c83/c88/c87 /c3/c53 /c87 /c81 /c14/c3 /c16/c21/c27 /c57 /c20/c21 /c47/c50 /c36/c39 /c14 /c16 /c47/c50 /c36/c39 /c47/c50 /c36/c39 /c14 /c16 /c14/c24 /c57 /c55 /c82 /c3 /c40 /c81 /c68 /c69/c79 /c72/c3 /c70/c76 /c85 /c70/c88 /c76 /c87 /c85 /c92 /c44 /c81/c75/c76 /c69/c76 /c87 /c44 /c81/c75/c76 /c69/c76 /c87 /c3 /c53 /c87 /c81 /c22 /c23 Inhibit Function: The converter is disabled when the INHIBIT pin is shorted to the INHIBIT RETURN with an impedance less than or equal to 1K ohm, and that the converter be enabled when the impedance between the INHIBIT pin and INHIBIT RETURN is greater than or equal to 500K ohms. Fig. 5 - Inhibit Function Remote Sense: A remote sense feature maintains the desired output voltage regulation at the load. It corrects the voltage drop along the conductors between converter’s output and the load. To use this function connect ±sense pins directly to the load as shown in Fig. 6. To use a converter without remote sense function, connect the ±sense pins to output pins respectively. This function is available just on single output models. Fig. 6 - Remote Sense - Single Models /c20/c22 /c20/c19 /c28 /c14 /c50 /c88 /c87 /c83/c88/c87 /c47/c54 /c50/c21 /c27 /c59 /c59/c54 /c16 /c50 /c88/c87 /c83/c88 /c87 /c14/c54 /c72 /c81 /c86 /c72 /c16/c54 /c72 /c81 /c86 /c72 /c20/c21 /c47/c50 /c36 /c39 /c14 /c16 /c53 /c47/c40 /c36 /c39 /c53 /c47/c40 /c36 /c39 /c53 /c72/c74 /c88/c79/c68 /c87 /c76/c82 /c81/c3 /c82 /c73 /c3 /c87 /c75/c72/c3 /c38 /c82/c81/c89/c72/c85 /c87 /c72/c85 /c182 /c86 /c3 /c50 /c88 /c87 /c83/c88/c87 /c20/c22 /c20/c19 /c28 /c14 /c50 /c88/c87 /c83/c88/c87 /c47/c54 /c50/c21 /c27 /c59/c59 /c54 /c16 /c50 /c88/c87 /c83/c88/c87 /c14/c54 /c72/c81 /c86 /c72 /c16/c54 /c72/c81 /c86 /c72 /c20/c21 /c47/c50 /c36 /c39 /c14 /c16 /c53 /c47/c40 /c36 /c39 /c53 /c47/c40 /c36 /c39 /c53 /c72 /c74 /c88/c79 /c68 /c87 /c76 /c82/c81/c3/c82/c73 /c3/c87 /c75 /c72 /c3/c38 /c82/c81 /c89/c72 /c85 /c87 /c72/c85 /c182 /c86 /c3 /c47 /c82 /c68 /c71 Application Notes:

Table 2. An approximate value of the resistor can be determined using the following formula. Radj is the external resistor in ohms, as shown in Fig 7. selection is dependent on specific design requirements. Vovp is the output voltage in volts. Table 2 for dual output models. in order to trim the output voltage of a LSO converter. Table 1. LSO2803R3S. Output Voltage Ranges and Constants Table 2. LSO2805S. Output Voltage Ranges and Constants Table 3. LSO2815S. Output Voltage Ranges and Constants Table 4. LSO2805D. Output Voltage Ranges and Constants Table 5. LSO2815D. Output Voltage Ranges and Constants

using the following formula. on specific design requirements. ovp is the output voltage protection limit in volts. added in order to set new OVP threshold. Adj pins and R1 from OVP Adj to -Output. placed across -OVP Adj to –Output. Table 7. LSO Duals. OVP Exeternal Table 6. LSO Singles. OVP Exeternal the output voltage as shown in Fig 9.

12 www.irf.com LSO SERIES 28V Input, Single/Dual Output Typical Performance Curves: 25°C TC, 28 VDC VIN, Rated Load, unless otherwise specified /c3 Fig. 10 - LSO2805S Efficiency Fig. 11 - LSO2805S Output Ripple Fig. 12 - LSO2805S Step Line Response, 18V to/from 40V. Fig. 13 - LSO2805S Step Load Response, Half Load to/from Full Load, 0.25A/µs Slew Rate. Fig. 14 - LSO2805S Turn On Response Fig. 15 - LSO2805S Loop Response, Phase = 60.01/c113 and Gain = -17.81dB

www.irf.com 13 LSO SERIES 28V Input, Single/Dual Output /c3 Fig. 16 - LSO2815D Efficiency Fig. 17 - LSO2815D Output Ripple Fig. 18 - LSO2815D Step Line Response, 18V to/from 40V. Fig. 19 - LSO2815D Step Load Response, Half Load to/from Full Load, 0.05A/µs Slew Rate. Fig. 20 - LSO2815D Turn On Response Fig. 21 - LSO2815D Loop response, Phase = 61.46/c113 and Gain = -22.45dB Typical Performance Curves: 25°C TC, 28 VDC VIN, Rated Load, unless otherwise specified

14 www.irf.com LSO SERIES 28V Input, Single/Dual Output Typical Performance Curves: 25°C TC, 28 VDC VIN, Rated Load, unless otherwise specified Fig. 22 - LSO2803R3S Efficiency. Fig. 23 - LSO2815S Efficiency. Fig. 24 - LSO2805D Efficiency.

www.irf.com 15 LSO SERIES 28V Input, Single/Dual Output Typical Performance Curves: 25°C TC, 28 VDC VIN, Rated Load, unless otherwise specified Fig. 25 - LSO2805S Full Load, Common Mode, Neagtive Lead. Fig. 26 - LSO2805S Full Load, Common Mode, Positive Lead. Fig. 27 - LSO2805S Full Load, Common Mode, Positive Lead.

16 www.irf.com LSO SERIES 28V Input, Single/Dual Output Typical Performance Curves: 25°C TC, 28 VDC VIN, Rated Load, unless otherwise specified Fig. 28 - LSO2815D Full Load, Common Mode, Neagtive Lead. Fig. 29 - LSO2815D Full Load, Common Mode, Positive Lead. Fig. 30 - LSO2815D Full Load, Common Mode, Positive Lead.

www.irf.com 17 LSO SERIES 28V Input, Single/Dual Output Mechanical Outline Pin Designation (Single/Dual) 3.055 MAX. 0.500 2.00 0.45 1.10 2.5002.30 0.200 Typ. Non- cum. 0.30 1.400 Ref. 3.50 Ref. 0.475 MAX. 0.080 Max. 0.260 Pin Ø0.040 R0.0625 4 places 0.50 0.60 0.20 Tolerance : .XX ±0.01 .XXX ±0.005 0.25 2.055 MAX. FLANGE DETAIL 0.40 0.25 0.14 R0.0625 Pin # Single Dual

1 Input Input

2 Input Return Input Return

3 Inhibit Inhibit

4 Inhibit Return Inhibit Return

5 U/V Latch U/V Latch

6 Case Ground Case Ground

7 Input Current Telemetry Input Current Telemetry

8 Output Adjust Output Adjust

11 OVP Adjust - Output

Note: Standard leads finish is solder dipped.

18 www.irf.com LSO SERIES 28V Input, Single/Dual Output Part Numbering Notes: /c99 Best commercial practice 05 S Model Input Voltage Nominal 28 = 28V LSO Screening Level (Please refer to Screening Table) No Suffix, EM Output Voltage 01R5 = 1.5V, 01R8 = 1.8V, 02R5 = 2.5V, 03R3 = 3.3V, 05 = 5V, 12 = 12V, 15 = 15V /EM Output S = Single D = Dual WORLD HEADQUARTERS: 101 N, Sepulveda Blvd., El Segundo, California 90245, USA Tel: (310) 252-7105 IR SAN JOSE: 2520 Junction Avenue, San Jose, California 95134, USA Tel: (408) 434-5000 Visit us at www.irf.com for sales contact information . Data and specifications subject to change without notice. 08/2013 Device Screening Requirement MIL-STD-883 Method No Suffix (Flight Model) EM (Engineering Model) Temperature Range -55°C to +85°C -55°C to +85°C Element Evaluation MIL-PRF-38534 Class K N/ A Non-Destruction Bond Pull 2023 YES N/ A Internal Visual 2017 YES /c99 Temperature Cycle 1010 Cond C Cond C Constant Acceleration 2001, Y1 Axis 3000 Gs 3000 Gs PIND 2020 Cond A N/ A 320 hrs @ 125°C 48 hrs @ 125°C (2 x 160 hrs) Final Electrical (Group A) MIL-PRF-38534 & Specif ication -55°C, +25°C,+ 85°C -55°C, +25°C, +85°C PDA MIL-PRF-38534 2% N/ A Seal, Fine and Gross 1014 Cond A, C Cond A Radiographic 2012 Yes N/ A External Visual 2009 Yes /c99 Burn-In 1015