90-VAC - 265-VAC input, non-isolated flyback reference design with multiple output PMP30545 (ACTIVE)

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Key Document


This offline flyback reference design uses the UCC28742 controller to generate a non-isolated output (15 V at 130 mA) and an isolated output (24 V at 830 mA) from an AC input (90 VAC - 265 VAC). The UCC28742 provides a cost effective and precise constant-voltage and constant-current regulation. The valley-switching technique reduces switching losses and keeps the efficiency high.

  • Universal input allows operation all over the world
  • Frequency dithering to ease EMI compliance
  • Valley-switching operation keeps the efficiency high

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Schematic/Block Diagram

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Design Files

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(Output Voltage 1)
(Output Voltage 2)
Vin (Min) (V)9090
Vin (Max) (V)265265
Vout (Nom) (V)2415
Iout (Max) (A).83.13
Output Power (W)19.921.95
Input TypeDCDC
TopologyFlyback- Quasi ResonantFlyback- Quasi Resonant

TI Devices (1)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
UCC28742  High-Efficiency Flyback Controller With Optocoupler 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)
UCC28742 Download Download

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Technical Documents

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User guides (1)
Title Type Size (KB) Date
PDF 1495 11 Dec 2018
Design files (6)
Title Type Size (KB) Date
ZIP 158 11 Dec 2018
ZIP 953 11 Dec 2018
PDF 173 11 Dec 2018
PDF 155 11 Dec 2018
PDF 31 11 Dec 2018
PDF 155 11 Dec 2018

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