1.0 DESCRIPTION The SVFA Series of space qualified point of load 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 SVFA 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 SVFA Series hybrid converter level. The SVFA Series of point of load 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 • Operates from 5 V input • Adjustable Output from 0.8 V to 3.4 V • Up to 10 Amps Output • High Efficiency, up to 94% • High Power Density, >100 W/in3 • Output Inhibit Control • Low Output Noise • No Use of Optoisolators • Short Circuit Protection Models Available Input: 5 V nominal 10 A output Qualified to MIL-PRF-38534 Class H and Class K 1.2 SPACE LEVEL CHARACTERIZATIONS • Guaranteed TID performance to 40 krad(Si) including ELDRS • SEE performance to 85 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 # 5962-16212 • MIL-PRF-38534 element evaluated components • 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: 16 g • Precision projection-welded hermetic metal case 1.5 SIMILAR PRODUCTS AND ACCESSORIES • SVFA0510SG 10 A space qualified point of load DC-DC converter • SVFA0515S 15 A space qualified point of load DC-DC converter • SVFA0515SG 15 A space qualified point of load DC-DC converter • SVGA0510S 10 A space qualified point of load DC-DC converter • SVGA0515S 15 A space qualified point of load DC-DC converter • SVRGA0508S 8 A space qualified point of load DC-DC converter • Custom versions available • Space qualified isolated DC-DC converters. 15 - 100 W • EMI filters

3.0 SPECIFICATIONS 3.1 ABSOLUTE MAXIMUM RATINGS E-mail: [email protected] Web: www.vptpower.com

SVFA0510S Series3.2 PERFORMANCE SPECIFICATIONS1 Tcase = -55 °C to +125 °C, Vin = +5 V ± 1%, Full Load, Unless Otherwise Specified Parameter Conditions Min Typ Max Units Sales Information Phone:(425) 353-3010 Fax: (425) 353-4030E-mail: [email protected] Web: www.vptpower.com SVFA0510S - 6.0 Page 3 Performance specifications are met with 100 pF from VIN to COM Dependent on output voltage Time for output voltage to settle within 1% of steady-state value Verified by qualification testing Output voltage not necessarily in regulation End-of-Life performance includes aging and radiation degradation...

SVFA0510S Series 4.0 PERFORMANCE CURVES 4.1.1 SVFA0510S Efficiency (Typical, 25 °C) Output Voltage: Output Voltage: Output Voltage: Output Voltage: Output Voltage: Sales Information E-mail: [email protected]

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) E-mail: [email protected] Web: www.vptpower.com

SVFA0510S 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 SVFA0510S Series is a non-isolated, fixed-frequency, radiation-hardened, synchronous buck converter. It operates from a 5 V input and provides a stepped-down, precisely regulated, programmable output voltage at very-high efficiency. The SVFA0510S is optimized for low voltage point of load applications. 6.1.2 External Components The SVFA0510S Series has internal input and output...

SVFA0510S Series 6.3 PROTECTION FEATURES 6.3.1 Input Undervoltage Lockout The SVFA0510S Series provides input undervoltage lockout protection. For input voltages below the turn-on voltage, the converter will remain off. When the input voltage exceeds the turn-on voltage, the converter will start. For input voltages below the operating range of the converter but above the UVLO turn-off voltage, the converter may reach its maximum duty cycle and the output may drop out of regulation. 6.3.2 Output Soft-Start The SVFA0510S Series utilizes an output soft-start function to ramp the output in a controlled...

6.5 RADIATION HARDNESS ASSURANCE VPT takes a conservative approach to radiation testing to ensure product performance in a space environment. VPT's DLA-approved Radiation Hardness Assurance (RHA) plan documents VPT's processes and procedures for guaranteeing the performance of VPT products under various environmental conditions in space including Total Ionizing Dose (TID) and Single-Event Effects (SEE). Additionally, Enhanced Low Dose-Rate Sensitivity (ELDRS) effects are considered for all bipolar ICs used in the hybrid. Hardness is guaranteed by a combination of both hybrid-level characterization...

7.0 ENVIRONMENTAL SCREENING 100% tested per MIL-STD-883 as referenced to MIL-PRF-38534. Contact sales for more information concerning additional environmental screening and testing options. VPT Inc. reserves the right to ship higher screened or SMD products to meet orders for lower screening levels at our sole discretion unless specifically forbidden by customer contract. MIL-STD-883 Test Method, Condition (Class H + PIND) (Class K) Non-Destructive Bond Pull Acceleration Direction Final Electrical Hermeticity (Seal) TM1015, 320 hrs., 125 °C, Case Typ TM1015, 160 hrs., 125 °C, Case Typ 24 hrs.,...