50.6W Valley Switching Flyback with Universal AC Input Reference Design PMP30251 (ACTIVE)

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Key Document


The PMP30251 reference design uses the UCC28740 flyback controller  to generate an isolated output 23V@2.2A from an universal AC input. The UCC28740 uses an optical coupler to regulate the output and to improve transient response. The valley-switching technique reduces switching losses and keeps the efficiency high.

  • Isolated output
  • Valley switching
  • Good transient response
  • Integrated 700V startup switch
  • Test report available

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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)264
Vout (Nom) (V)23
Iout (Max) (A)2.2
Output Power (W)50.6
Input TypeAC
TopologyFlyback- DCM

TI Devices (2)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
LMV431A  Low-Voltage (1.24V) Adjustable Precision Shunt Regulators  Voltage references  Sample & Buy Not Available
UCC28740  Constant-Voltage, Constant-Current Flyback Controller Using Opto-Coupler Feedback  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)
LMV431A Download Download
Download Download
UCC28740 Download Download

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Technical Documents

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User guides (1)
Title Type Size (KB) Date
PDF 837 25 Sep 2017
Design files (6)
Title Type Size (KB) Date
ZIP 75 25 Sep 2017
ZIP 1033 25 Sep 2017
PDF 169 25 Sep 2017
PDF 143 25 Sep 2017
PDF 192 25 Sep 2017
PDF 148 25 Sep 2017

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