80V/50W PSR Flyback Reference Design
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Key Document


This reference design is a universal line 85-265VAC input to 80V/50W power supply in a small form-factor, cost-effective design. It uses the UCC28704 controller. The design features an optional FET-startup circuit for low standby power and achieves over 91% efficiency. The PMP20545 Board is a 4-layer, 1-oz copper weight per layer, 80mm x 60mm board with 24mm max component height. This design is Non-isolated.

  • 85VAC-265VAC input to 80V/50W output
  • Over 91% efficiency at full load
  • Optional FET startup circuit enables lower standby power
  • Good thermal perfomance given small transformer size
  • 1oz, 4-layer board measuring 80mm x 60mm x 24mm size

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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)
Vin (Min) (V)85
Vin (Max) (V)265
Vout (Nom) (V)80
Iout (Max) (A).625
Output Power (W)50
Input TypeAC
TopologyFlyback- Quasi Resonant

TI Devices (1)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
UCC28704  Off-lineconstant-voltage constant-current Flyback controller with primary-side regulation (PSR)  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)
UCC28704 Download Download

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Technical documentation

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User guides (1)
Title Type Size (KB) Date
PDF 1052 30 May 2017
Design files (6)
Title Type Size (KB) Date
ZIP 403 30 May 2017
ZIP 4573 30 May 2017
PDF 542 30 May 2017
PDF 133 30 May 2017
PDF 64 30 May 2017
PDF 107 30 May 2017

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