Snubberless, Non-Isolated AC/DC Flyback Converter Reference Design with Simplified Transformer
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Key Document


TIDA-00628 is a 15V/6.5W non-isolated, single output, AC/DC Flyback power supply that is capable of operating from wide input voltage ranging from 85Vac to 440Vac. This design demonstrates 2 key features (1) the elimination of snubber components enabled by use of a high-voltage bipolar transistor and (2) simplified transformer design with no need for an auxilliary winding.  Low system parts count and built in advanced protection features result in a cost-effective solution for electricity meters and industrial designs.

  • Input voltage up to 440Vrms, 15V/6.5W output
  • No snubber - reduces BoM count and PCB area
  • BJT switch to reduce system cost
  • Non Isolated output allows simplified transformer with no auxilliary winding
  • Typical efficiency of 80% at 230V, 6.5W
  • Compliant with Conducted Emissions: CISPR 22, Class B

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Design Files

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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

CAD/CAE symbols

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

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Technical documentation

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User guide (2)
Title Type Size (KB) Date
PDF 1264 27 Jan 2016
PDF 93 25 Aug 2015
Design files (6)
Title Type Size (KB) Date
ZIP 447 21 Sep 2015
ZIP 953 21 Sep 2015
PDF 4281 21 Sep 2015
PDF 108 21 Sep 2015
PDF 40 21 Sep 2015
PDF 321 21 Sep 2015

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