*mydirectindustry

Catalogs
VPT Inc
SVRFL2800S SERIES

SVRFL2800S SERIES

Product catalog summary

Overview
The SVRFL2800S Series is a line of space-qualified hybrid DC-DC converters designed for harsh radiation environments in space applications. These converters comply with Aerospace TOR requirements and are characterized for Total Ionizing Dose (TID) and Single Event Effects (SEE) performance.

Specifications

Input Voltage: 18 V to 40 V continuous, 50 V transient
Output Power: Up to 100 W, with single output options of 3.3 V, 5 V, 12 V, 15 V
Temperature Range: Operates from -55 °C to +125 °C without power derating
Radiation Hardness: Guaranteed TID performance to 100 krad(Si) and SEE performance to 85 MeV/mg/cm²
Compliance: Qualified to MIL-PRF-38534 Class H and Class K, MIL-STD-461, MIL-STD-883, and ISO-9001

Features

Low output noise and high efficiency
Parallel operation with current sharing
Output voltage trim capability
Radiation immune magnetic feedback circuit
Protection features include undervoltage lockout and current limit protection

Performance Specifications

Efficiency ranges from 69% to 86% depending on the model and conditions
Ripple voltage and current specifications ensure low noise operation
Dynamic response characterized by load and line step performance

Mechanical and Packaging

Low-profile design with a precision seam-welded hermetic metal case
Standard and optional side-flanged package options available
Industry-standard pinout for ease of integration

Technical Notes
The converter uses a forward converter topology with magnetic feedback for isolation. It is designed to operate without external components, though additional capacitors can be used to reduce output ripple. The output can be configured for positive or negative voltage, and multiple converters can be stacked for higher voltage outputs.

Function Descriptions
On/Off control is managed via INH1 and INH2 pins, allowing for easy integration into system designs.

Applications
The SVRFL2800S Series is suitable for use in low Earth orbit (LEO), medium Earth orbit (MEO), geostationary orbit (GEO), deep space, and launch vehicle programs.

Inhibit Pins (INH1, INH2)
The INH1 pin is used to disable the output by pulling it below 1.5 V. An optional capacitor can delay turn-on. The INH2 pin, referenced to OUTCOM, disables the converter output when pulled below 1.0 V. Both pins should be left open if not used.

Output Voltage Adjustment (TRIM)
The output voltage can be adjusted using the TRIM pin with a resistor. The trim range is -20% to +10% from nominal. Resistor values for different output voltages are provided. The TRIM pin should be close to the converter to avoid noise interference.

Remote Sense
This function compensates for voltage drops and can handle up to a 10% drop. The sum of TRIM up and remote sense compensation should not exceed 10%.

Frequency Synchronization (SYNCIN, SYNCOUT)
The converter operates at 525 kHz. SYNCIN can be driven by an external clock, and SYNCOUT can synchronize other converters. Proper layout is necessary to prevent noise.

Parallel Operation (SHARE)
Enables active current sharing among modules. Paralleled converters should be close together with a low impedance OUTCOM connection.

Protection Features
Includes input undervoltage lockout, output soft start, and output overcurrent protection. The soft start ensures controlled ramp-up, and overcurrent protection limits output current to 125% of its rated value.

Thermal Considerations
Rated for full power at 125 °C, with derating above this temperature. The converter is conduction-cooled, and the baseplate should be mounted to a thermal surface.

Radiation Hardness Assurance
VPT ensures performance in space environments with a DLA-approved RHA plan. Testing includes Total Ionizing Dose (TID) and Single-Event Effects (SEE).

Environmental Screening
Tested per MIL-STD-883. Additional screening options are available upon request.

Standard Microcircuit Drawing (SMD) Numbers
Lists various SMD numbers for the SVRFL2800S series.

Specifications and Ordering Information
The document provides information on the SVRFL2800S Series, including specifications for SMD products. For precise specifications, users are directed to the SMD drawing available on the DLA Land and Maritime website. The SMD number includes details such as Federal Stock Class, Device Type, and more. All SMD products are marked with a 'Q' as per MIL-PRF-38534 requirements.

Ordering Information
The ordering code for the SVRFL2800S Series is broken down into seven parts: Product Series, Nominal Input Voltage, Output Voltage, Number of Outputs, Package Option, Screening Code, and Additional Screening Code. Various options are available, including Engineering Models and Class H or K qualified products. Engineering models are not suitable for flight use and are intended for low volume engineering characterization.

Contact Information
For quotations or orders, contact the VPT, Inc. Sales Department via phone, fax, or email. The document notes that while the information is believed to be accurate, it is subject to change without notice.

Additional Resources
Additional technical resources, including product catalogs, application notes, and technical videos, are available on the VPT website for further information on products for avionics, military, and space applications.

Catalog excerpts

vpr Power Your Critical Mission Today Models Available Input: 18 V to 40 V continuous, 50 V transient 100 W, single output of 3.3 V, 5 V, 12 V, 15 V Qualified to MIL-PRF-38534 Class H and Class K Designed for TOR Compliance 1.0 DESCRIPTION The SVRFL Series of space qualified DC-DC converters is specifically designed for the harsh radiation environment of space applications and is designed in accordance with Aerospace TOR requirements. Performance is guaranteed through the use of hardened semiconductor components, radiation lot acceptance testing (RLAT) of non-hardened components, and analysis. The SVRFL 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 R. Characterization is performed at both the component level and at the SVRFL Series hybrid converter level. The SVRFL Series of DC-DC converters is radiation hardened 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 100 W output power • Wide input voltage range: 18 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 100 krad(Si) including ELDRS • SEE performance to 85 MeV/mg/cm2. 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 # 5962-13233 • Available compliant to MIL-HDBK-1547 and Aerospace TOR component level element evaluation • 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 1.5 SIMILAR PRODUCTS AND ACCESSORIES • SVRFL 100 W dual output DC-DC converter • SVFL 100 W space qualified DC-DC converter, 30 krad(Si) • Custom versions available • EMI filters • Non-isolated, space qualified point of load converters • Use with Thermal Pad TP-001 Products and reports described in this datasheet are subject to all export license restrictions and regulations which may include but are not limited to ITAR (International Traffic in Arms Regulations) and the Export Administration and Foreign Assets Control Regulations. Further restrictions may apply. Contact VPT sales for details. O-O

Open the catalog to page 1

SVRFL2800S Series 2.0 DIAGRAMS 2.1 BLOCK DIAGRAM 28VIN INCOM Q1 MAGNETIC FEEDBACK UNDER VOLTAGE SHUTDOWN VOLTAGE AND CURRENT AMPLIFIERS 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):

Open the catalog to page 2

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 initial electrical design verification. Post design verification, parameter shall be guaranteed to the limits specified 3. End-of-Life performance includes aging and radiation degradation and is within standard limits except where noted 4. Correction factor of 0.12 added to ceramic capacitors 5. 37.5 V Max continuous to be compliant to MIL-HDBK-1547 and Aerospace TOR Sales Information Phone:(425)...

Open the catalog to page 3

Open the catalog to page 4

SVRFL2800S Series 4.0 PERFORMANCE CURVES 4.1.1 SVRFL283R3S Efficiency (Typical, 25 °C) Sales Information

Open the catalog to page 5

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

Open the catalog to page 6

SVRFL2800S Series 5.0 MECHANICAL OUTLINES AND PINOUT (CONTINUED) Optional Side-Flanged Package: 4X BASEPLATE SURFACE (BOTTOM) Tolerances are +0.005” unless otherwise stated Case temperature is measured on the center of the baseplate surface Mounting holes are not threaded. Recommended fastener is 4-40 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

Open the catalog to page 7

SVRFL2800S SERIES

SVRFL2800S SERIES

Catalog excerpts

All VPT Inc catalogs and technical brochures