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VPT Inc
SVFL2800S SERIES

SVFL2800S SERIES

Product catalog summary

Overview: The SVFL2800S Series is a line of space-qualified hybrid DC-DC converters designed for harsh radiation environments in space applications. These converters are characterized for Total Ionizing Dose (TID) and Single Event Effects (SEE) and are suitable for use in various orbits and deep space missions.

Specifications: The converters offer a wide input voltage range from 16 V to 40 V, with a transient capability of up to 50 V. They provide a single output of 3.3 V, 5 V, 12 V, or 15 V with up to 120 W output power. The devices operate over a temperature range of -55 °C to +125 °C without power derating.

Features: Key features include low output noise, the ability to parallel up to five units with current sharing, output voltage trimming, and protection mechanisms such as undervoltage lockout and current limit protection. The converters use a radiation-immune magnetic feedback circuit and do not employ optoisolators.

Space Level Characterizations: The converters are guaranteed for TID performance up to 30 krad(Si) and SEE performance to 44 MeV-cm2/mg. They are qualified to MIL-PRF-38534 Class H and Class K standards.

Manufacturing and Compliance: The converters are manufactured in facilities compliant with MIL-PRF-38534 and ISO-9001 standards. They meet MIL-STD-461 C/D/E/F when used with appropriate EMI filters.

Packaging: The converters are housed in a low-profile, hermetic metal case with a standard industry pinout. They are available in standard and optional side-flanged versions.

Performance Specifications: The converters exhibit high efficiency, with typical values ranging from 67% to 85% depending on the model and conditions. They support capacitive loads up to 1000 µF and have a switching frequency range of 425 kHz to 600 kHz.

Technical Notes: The SVFL2800S Series uses an isolated, single output, forward converter topology with magnetic feedback. It does not require external components for operation, though additional output capacitance can be added to meet specific ripple requirements. The converters can be configured for positive or negative output voltages and can be stacked for higher voltage outputs.

Function Descriptions: The converters feature on/off control via INH1 and INH2 pins, allowing for output inhibition and enabling. The output voltage can be adjusted using the TRIM pin, with a range of -20% to +10% from nominal.

Specifications and Adjustments: The document provides a table for adjusting the output voltage (+Vout) of the VFL2815S series using specific resistor values (Rtrim). The table lists various output voltages and their corresponding resistor values needed for trimming.

Remote Sense: Remote sensing compensates for voltage drops by regulating directly at the load. It can handle up to a 10% voltage drop. If not used, +S should be connected to +VOUT and -S to OUTCOM.

Frequency Synchronization: The SVFL2800S Series operates at a default frequency of 525 kHz. It includes SYNCIN and SYNCOUT pins for frequency synchronization, which is optional unless system constraints require it. Proper layout is necessary to prevent noise interference.

Parallel Operation: The SHARE function allows for active current sharing among parallel modules. Proper physical arrangement and symmetrical layout improve accuracy. Frequency synchronization is not required for parallel operation.

Protection Features:

Input Undervoltage Lockout: Prevents operation below a certain input voltage, ensuring controlled startup.
Output Soft Start: Controls output ramp-up to prevent overshoot and limit inrush current, with a rise time of approximately 4 ms.
Output Overcurrent Protection: Limits output current to 125% of its rated value during overload conditions, with automatic recovery.

Thermal Considerations: The converter is rated for full power at 125°C, with derating required above this temperature. It is designed for conduction cooling via the baseplate.

Radiation Hardness Assurance (RHA): VPT's RHA plan ensures product performance in space environments, covering TID, SEE, and ELDRS. Detailed reports and testing procedures are outlined for radiation exposure and component stress analysis.

Environmental Screening: Products are tested per MIL-STD-883 and MIL-PRF-38534 standards. Various tests include bond pull, visual inspections, temperature cycling, and hermeticity checks.

Ordering Information: The document provides a breakdown of the ordering code for the SVFL2800S Series, detailing product series, input/output voltage, package options, and screening codes.

Engineering Models Usage: The document specifies that certain models are intended solely for low volume engineering characterization and are not compliant for flight use. Customers must acknowledge this limitation in their purchase orders for engineering models.

Contact Information: For inquiries or orders, contact VPT, Inc. Sales Department via phone at (425) 353-3010, fax at (425) 353-4030, or email at [email protected].

Disclaimer: The datasheet information is believed to be accurate, but VPT, Inc. assumes no responsibility for errors or omissions. Specifications may change without notice.

Additional Resources: Visit the VPT website for more technical resources, including product catalogs, application notes, white papers, technical videos, and information on additional products for avionics, military, Hi-Rel COTS, and space applications.

Catalog excerpts

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

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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]

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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

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

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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

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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

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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...

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SVFL2800S SERIES

SVFL2800S SERIES

Catalog excerpts

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