vpr Power Your Critical Mission Today Models Available Input: 16 V to 40 V continuous, 50 V transient 120 W, single output of 3.3 V, 5 V, 12 V, 15 V Qualified to MIL-PRF-38534 Class H and Class K 1.0 DESCRIPTION The SVFL 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 SVFL 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 SVFL Series hybrid converter level. The SVFL 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 120 W output power • Wide input voltage range: 16 V to 40 V plus 50 V transient • Continuous operation over full military temperature range of -55 °C to +125 °C with no power derating • Very low output noise • Parallel up to 5 units with current sharing • Output voltage trim up +10% or down -20% • Radiation immune magnetic feedback circuit • No use of optoisolators • Undervoltage lockout • Current limit protection / short circuit protection 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 # 5962-11217 • 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: 3.005” x 1.505” x 0.400” • Max weight: 86 g • Industry standard pinout • Precision seam-welded hermetic metal case • Standard and optional side-flanged versions available 1.5 SIMILAR PRODUCTS AND ACCESSORIES • SVFL 120 W dual output DC-DC converter • SVRFL 100 W space qualified DC-DC converter, 100 krad(Si) • Custom versions available • EMI filters • Non-isolated, space qualified point of load converters • Use with Thermal Pad TP-001

SVFL2800S Series 2.0 DIAGRAMS 2.1 BLOCK DIAGRAM 28VIN OUTCOM INCOM Q1 VOLTAGE AND CURRENT AMPLIFIERS MAGNETIC FEEDBACK UNDER VOLTAGE SHUTDOWN PRIMARY HOUSEKEEPING SUPPLY SECONDARY HOUSEKEEPING SUPPLY 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): E-mail: [email protected]

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 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

SVFL2800S Series 4.0 PERFORMANCE CURVES 4.1.1 SVFL283R3S Efficiency (Typical, 25 °C) Sales Information E-mail: [email protected]

vpr Power Your Critical Mission Today O- BASEPLATE SURFACE 1. Tolerances are +0.005” unless otherwise stated 2. Case temperature is measured on the center of the baseplate surface 3. Mounting holes are not threaded. Recommended fastener is 4-40 4. Materials: Case (Steel, gold over nickel plated); Cover (Kovar, 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 SVFL2800S - 7.0 Page 6

vpr Power Your Critical Mission Today O- 1. Tolerances are +0.005” unless otherwise stated 2. Case temperature is measured on the center of the baseplate surface 3. Mounting holes are not threaded. Recommended fastener is 4-40 4. Materials: Case (Steel, gold over nickel plated); Cover (Kovar, 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 SVFL2800S - 7.0 Page 7

SVFL2800S 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 SVFL2800S Series is an isolated, single output, forward 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...