85V - 265V AC in, 12V/3.3A AC/DC Open Frame Power Supply Based on PSR Flyback Reference Design
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This reference design provides an isolated 12V/3.3A output from a universal 85V-265V AC input.  This design achieves efficiencies greater than 84%. Employing the UCC28710D Primary Side Regulation (PSR) Flyback controller eliminates the opto-coupler and secondary side regulation components.  The energy saving features of the UCC28710D allow this design to consume less than 75mW when plugged into the wall with no device attached to the output.

  • Greater than 83% efficiency at full load (12V/3.3A)
  • Less than 70mW of stand-by power consumption under no load
  • Constant Current regulation feature of UCC28710D ensures output short-circuit protection
  • Fast Start-up

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Design Files

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(Output Voltage 1)
Vin (Min) (V)85
Vin (Max) (V)265
Vout (Nom) (V)12
Iout (Max) (A)3.3
Output Power (W)39.6
Input TypeAC
TopologyFlyback- DCM
Flyback- Non Sync
Flyback- Quasi Resonant

TI Devices (1)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
UCC28710  Constant-voltage, constant-current PWM with PSR, valley switching & Programmable cable compensation  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)
UCC28710 Download

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Technical documentation

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User guide (1)
Title Type Size (KB) Date
PDF 2663 24 Aug 2015
Design files (5)
Title Type Size (KB) Date
PDF 98 24 Nov 2014
ZIP 186 27 Mar 2014
PDF 473 27 Mar 2014
PDF 83 27 Mar 2014
PDF 128 27 Mar 2014

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