vpr Power Your Critical Mission Today 1.0 DESCRIPTION The SVSA Series of space qualified DC-DC converters is specifically designed for the harsh radiation environment of space applications. Performance is guaranteed through the use of hardened semiconductor components, radiation lot acceptance testing (RLAT) of non-hardened components, and analysis. The SVSA Series has been characterized for Total Ionizing Dose (TID) performance including Enhanced Low Dose Rate Sensitivity (ELDRS) and for Single Event Effects (SEE) according to VPT's DLA-approved Radiation Hardness Assurance (RHA) plan per MIL-PRF-38534, Appendix G, Level P. Characterization is performed at both the component level and at the SVSA Series hybrid converter level. The SVSA Series of DC-DC converters is radiation tolerant and suited for use in low Earth orbit (LEO), medium Earth orbit (MEO), geostationary orbit (GEO), deep space, and launch vehicle programs. 1.1 FEATURES • Up to 6 W output power • Wide input voltage range: 15 V to 50 V plus 80 V transient • Continuous operation over full military temperature range of -55 °C to +125 °C with no power derating • Very low output noise • Radiation immune magnetic feedback circuit • No use of optoisolators • Undervoltage lockout • Current limit protection / short circuit protection Models Available Input: 15 V to 50 V continuous, 80 V transient 6 W, single output of 3.3 V, 5 V, 5.2 V, 12 V, 15 V Qualified to MIL-PRF-38534 Class H and Class K 1.2 SPACE LEVEL CHARACTERIZATIONS • Guaranteed TID performance to 30 krad(Si) including ELDRS • SEE performance to 44 MeV-cm2/mg. Transients are fully characterized for cross section and magnitude • Worst-case analysis, stress, radiation, reliability reports available 1.3 MANUFACTURING AND COMPLIANCE • Qualified to MIL-PRF-38534 Class H and Class K, DLA SMD # 5962-11219 • MIL-PRF-38534 element evaluated components • MIL-STD-461 C/D/E/F when used with appropriate VPT EMI filter • Manufactured in a MIL-PRF-38534 Class H and Class K facility • MIL-STD-883 • ISO-9001 1.4 PACKAGING • Low-profile: 1.075” x 1.075” x 0.270” • Max weight: 15 g • Industry standard pinout • Precision projection-welded hermetic metal case 1.5 SIMILAR PRODUCTS AND ACCESSORIES • SVSA 6 W dual output DC-DC converter • Custom versions available • EMI filters • Non-isolated, space qualified point of load converters • Use with Thermal Pad TP-005

SVSA2800S Series 2.0 DIAGRAMS 2.1 BLOCK DIAGRAM D1 UNDER VOLTAGE SHUTDOWN PRIMARY HOUSEKEEPING SUPPLY VOLTAGE AND CURRENT AMPLIFIERS MAGNETIC FEEDBACK SECONDARY HOUSEKEEPING SUPPLY 2.2 CONNECTION DIAGRAM DVMA28 EMI FILTER 1 3.0 SPECIFICATIONS 3.1 ABSOLUTE MAXIMUM RATINGS Absolute Maximum Ratings Input Voltage (Continuous): Input Voltage (Transient, 1 second): ESD Rating per MIL-PRF-38534: Sales Information Operating Temperature (Full Load): Storage Temperature: Lead Solder Temperature (10 seconds):

vpr Power Your Critical Mission Today O- Tcase = -55 °C to +125 °C, Vin = +28 V ± 5%, Full Load, Unless Otherwise Specified Parameter Conditions Min Typ Max Min Typ Max Units 1. Time for output voltage to settle within 1% of steady-state value 2. Verified by qualification testing 3. End-of-Life performance includes aging and radiation degradation and is within standard limits except where noted Sales Information Phone:(425) 353-3010 Fax: (425) 353-4030E-mail: [email protected] Web: www.vptpower.com

vpr Power Your Critical Mission Today O- Tcase = -55 °C to +125 °C, Vin = +28 V ± 5%, Full Load, Unless Otherwise Specified 1. Time for output voltage to settle within 1% of steady-state value 2. Verified by qualification testing 3. End-of-Life performance includes aging and radiation degradation and is within standard limits except where noted Sales Information Phone:(425) 353-3010 Fax: (425) 353-4030E-mail: [email protected] Web: www.vptpower.com

vpr Power Your Critical Mission Today O- Tcase = -55 °C to +125 °C, Vin = +28 V ± 5%, Full Load, Unless Otherwise Specified Sales Information Phone:(425) 353-3010 Fax: (425) 353-4030E-mail: [email protected] Web: www.vptpower.com SVSA2800S - 9.0 Page 5 Verified by qualification testing Time for output voltage to settle within 1% of steady-state value End-of-Life performance includes aging and radiation degradation and is within standard limits except where noted

vpr Power Your Critical Mission Today O- E-mail: [email protected] Web: www.vptpower.com

vpr Power Your Critical Mission Today O- BASEPLATE SURFACE7X SEAL 0.070in±0.002 1.78mm±0.05 1. Tolerances are +0.005” unless otherwise stated 2. Case temperature is measured on the center of the baseplate surface 3. Materials: Case (Steel, gold over nickel plated); Cover (Steel, nickel plated); Pin (Copper-cored alloy 52, gold over nickel plated); Pin Seals (Glass) Sales Information Phone:(425) 353-3010 Fax: (425) 353-4030E-mail: [email protected] Web: www.vptpower.com SVSA2800S - 9.0 Page 7

SVSA2800S Series 6.0 TECHNICAL NOTES Please note that many of these functions are also demonstrated in detail on the VPT website in the form of technical video labs. 6.1 GENERAL INFORMATION 6.1.1 Topology Description The SVSA2800S Series is an isolated, single output, flyback converter. It operates over a wide input voltage range and provides a tightly regulated positive output voltage with respect to the OUTCOM pin. Feedback isolation is accomplished using VPT’s proprietary magnetic feedback technology. The converter regulates with zero load, and no minimum load is required. 6.1.2 External Components...

SVSA2800S Series 6.3 PROTECTION FEATURES 6.3.1 Input Undervoltage Lockout The SVSA2800S Series provides input undervoltage lockout protection. For input voltages below the turn-on voltage, the converter will remain off, drawing minimal current from the source. When the input voltage exceeds the turn-on voltage, the converter will start. The lockout circuit is designed to tolerate slow ramping input voltage waveforms. VPT’s proprietary magnetic feedback technology provides bias voltage to all secondary control circuits and control amplifiers before the output starts, ensuring a well-controlled...