12V/12W PSR Flyback Reference Design
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Key Document


The PMP20634 reference design is an isolated DCM flyback design that takes a universal line input 85VAC to 265VAC, and produces a 12V ouput capable of 12W loading. The design uses the UCC28730 controller that achieves ultra-low standby power at no load. It achieves 85% efficiency at high and low line, and measures 1in x 3in on a 2 layer board.

  • Universal input, 85VAC to 265VAC
  • Achieves over 85% efficiency at low and high line
  • Optional, isolated-disable circuit available
  • Primary side regulation allows for simple design
  • 2-layer board, 1 oz copper, measuring 1in x 3in

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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)12
Iout (Max) (A)1
Output Power (W)12
Input TypeAC
TopologyFlyback- Quasi Resonant

TI Devices (1)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
UCC28730  Zero sandby PSR Flyback controller with CVCC and wake-up monitoring  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)
UCC28730 Download Download

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Technical documentation

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User guides (1)
Title Type Size (KB) Date
PDF 868 23 Jun 2017
Design files (6)
Title Type Size (KB) Date
ZIP 430 23 Jun 2017
ZIP 696 23 Jun 2017
PDF 507 23 Jun 2017
PDF 103 23 Jun 2017
PDF 62 23 Jun 2017
PDF 91 23 Jun 2017

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