100V-450VDC, 5W, 80% Efficiency at 1W, Auxiliary Supply Reference Design for AC-DC Power Supplies
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Key Document


The TIDA-00708 is a 5-W multiple-output auxiliary power supply designed for use in power converters targeted for applications in industrial, server, telecom, and consumer systems. This reference design is a flyback converter implemented using the device UCC28881 that integrates the controller, 700-V power MOSFET, and internal current sense into one monolithic device. The design is simple, compact, and low cost due to minimal component count with all the necessary protections, such as output overcurrent, output short circuit, and over-temperature conditions, built in. Hardware is designed and tested to pass EFT requirements and meets low-power efficiency performance of Department of Energy (DoE) Level VI.

  • Designed for wide operating input voltage range from 100 VDC to 450 VDC
  • Very low standby power of <50 mW
  • High efficiency >82% at 165 VDC and >84% at 400 VDC for loads greater than 75%
  • Multiple outputs: 12 V/0.2 A, 3.3 V/0.25 A, 12 V/0.15 A (isolated)
  • Ultra-simple circuit with low-cost off the shelf components with a compact form factor (32 mm x 25 mm)

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Schematic/Block Diagram

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Design Guide

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Design Files

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TI Devices (2)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
TLV702  300-mA, high-PSRR, low-IQ, low-dropout voltage regulator with enable  Power management  Sample & Buy View Design Kits & Evaluation Modules
UCC28881  700-V Lowest Quiescent current off-line switcher  Offline & isolated DC/DC controllers & converters  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
TLV702 Download Download
Download Download
UCC28881 Download Download

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Technical documentation

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User guide (1)
Title Type Size (KB) Date
PDF 3414 16 Aug 2016
Design files (6)
Title Type Size (KB) Date
ZIP 1719 10 Mar 2016
PDF 113 10 Mar 2016
ZIP 225 10 Mar 2016
PDF 856 10 Mar 2016
PDF 103 10 Mar 2016
PDF 220 10 Mar 2016

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