15-W multi-output off-line flyback reference design
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This reference design takes a universal Vac input and creates three isolated 15-Vdc outputs. The main output can be loaded up to 1-A and achieves over 86% efficiency. The other isolated 15-V outputs can be loaded to 50-mA. These outputs have linear regulators to keep the voltages within 1% regardless of cross-loading conditions.

  • Primary side regulated flyback to create multiple isolated outputs
  • Low profile >20mm design
  • 3% accuracy on 1-A output, 1% accuracy on 50-mA outputs

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Schematic/Block Diagram

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Design Guide

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Design Files

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(Output Voltage 1)
(Output Voltage 2)
Vin (Min) (V)8516.7
Vin (Max) (V)26517.1
Vout (Nom) (V)1515
Iout (Max) (A)1.05
Output Power (W)15.75
Input TypeACDC
TopologyFlyback- Quasi ResonantLinear Regulator

TI Devices (3)

Order samples, get tools and find more information on the TI products in this reference design.

Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
ATL431  2.5-V low-IQ adjustable precision shunt regulator  Voltage references  Sample & Buy View Design Kits & Evaluation Modules
TLV760  100-mA, 30-V, low-dropout voltage regulator  Power management  Sample & Buy View Design Kits & Evaluation Modules
UCC28711  Constant-voltage, constant-current PWM with PSR, valley switching, NTC option, and 0-mV cable comp.  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)
ATL431 Download Download
TLV760 Download Download
UCC28711 Download

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Technical documentation

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User guide (1)
Title Type Size (KB) Date
PDF 2241 28 Jun 2019
Design files (6)
Title Type Size (KB) Date
PDF 291 01 Jul 2019
PDF 170 01 Jul 2019
ZIP 1170 28 Jun 2019
ZIP 919 28 Jun 2019
PDF 791 28 Jun 2019
PDF 137 28 Jun 2019

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