85V - 265V AC in, 12V/3.3A AC/DC Open Frame Power Supply Based on PSR Flyback Reference Design


Design files


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
Output voltage options PMP9576.1
Vin (Min) (V) 85
Vin (Max) (V) 265
Vout (Nom) (V) 12
Iout (Max) (A) 3.3
Output Power (W) 39.6
Isolated/Non-Isolated Isolated
Input Type AC
Topology Flyback- DCM^Flyback- Non Sync^Flyback- Quasi Resonant
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A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.


Test results for the reference design, including efficiency graphs, test prerequisites and more


Detailed schematic diagram for design layout and components


Complete listing of design components, reference designators, and manufacturers/part numbers


Detailed overview of design layout for component placement

SLUC535.ZIP (186 K)

Design file that contains information on physical board layer of design PCB


PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Flyback controllers

UCC28710Constant-voltage, constant-current PWM with PSR, valley switching & Programmable cable compensation

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
Test report PMP9576 Test Results (Rev. A) Aug. 24, 2015

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