Dual-Output 5V at 300mA and 15V at 100mA Isolated Flyback From 85V to 440V AC Mains Reference Design
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Key Document


This is an isolated quasi-resonant flyback converter, supplying 5 V at 300 mA and 15 V at 100 mA; both outputs are isolated from each other. The UCC28722 has been chosen to drive a low-cost high-voltage BJT transistor.

  • UCC28722-based isolated flyback
  • 70% peak efficiency at full load 325-V DC input voltage
  • Wide input voltage range: 85-V to 440-V AC
  • Low cost due to main switch BJT transistor
  • Magnetic feedback - no optocoupler needed

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(Output Voltage 1)
(Output Voltage 2)
Vin (Min) (V)8585
Vin (Max) (V)440440
Vout (Nom) (V)515
Iout (Max) (A).3.1
Output Power (W)1.51.5
Input TypeACAC
TopologyFlyback- Quasi ResonantFlyback- Quasi Resonant

TI Devices (1)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
UCC28722  Low-Cost CVCC Flyback controller With primary-side regulation for bipolar Power Device  Offline & isolated DC/DC controllers & converters  Sample & Buy View Design Kits & Evaluation Modules

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Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
UCC28722 Download

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Technical documentation

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User guides (1)
Title Type Size (KB) Date
PDF 702 28 Apr 2016
Design files (6)
Title Type Size (KB) Date
ZIP 181 28 Apr 2016
ZIP 110 28 Apr 2016
PDF 656 28 Apr 2016
PDF 79 28 Apr 2016
PDF 109 28 Apr 2016
PDF 259 28 Apr 2016

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