High and Wide AC Vin Quasi-Resonant Isolated Flyback Reference Design
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Key Document


PMP7991 is a quasi-resonant isolated flyback using the LM5023 controller IC. The design accepts an input voltage of 85VAC to 265VAC and provides a selectable output of 12Vout or 5Vout capable of supplying 2A of current to the load. The quasi-resonant switching scheme helps to reduce EMI.

  • Isolated flyback converter
  • Wide input range suitable for worldwide AC input condition
  • Output is switch selectable for 5V or 12V at 2A
  • Quasi-resonant switching for low EMI

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(Output Voltage 1)
(Output Voltage 2)
Vin (Min) (V)8585
Vin (Max) (V)265265
Vout (Nom) (V)512
Iout (Max) (A)22
Output Power (W)1024
Input TypeACAC
TopologyFlyback- Quasi ResonantFlyback- Quasi Resonant

TI Devices (2)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
LM5023  AC-DC quasi-Resonant current mode PWM controller  Offline & isolated DC/DC controllers & converters  Sample & Buy View Design Kits & Evaluation Modules
LMV431  1.5%, low-voltage (1.24-V) adjustable precision shunt regulator  Voltage references  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
LM5023 Download Download
LMV431 Download Download
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Technical documentation

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User guides (1)
Title Type Size (KB) Date
PDF 1139 29 Sep 2015
Design files (6)
Title Type Size (KB) Date
ZIP 271 29 Sep 2015
ZIP 405 29 Sep 2015
PDF 317 29 Sep 2015
PDF 103 29 Sep 2015
PDF 136 29 Sep 2015
PDF 335 29 Sep 2015

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