85-265VACin, 12V/1.5A PSR Flyback Reference Design


Design files


This reference design uses the UCC28713 primary-side regulated (PSR) flyback controller to generate a 12V/1.5A output from a univeral AC input. The valley switching of the UCC28713 allows this low-cost design to achieve an average efficiency over 87%; no load losses are less than 50mW.  The PSR function eliminates the need for an optocoupler and TL431, greatly simplifying the circuit and reducing cost.

  • Primary side regulation eliminates the need for an optocoupler and TL431.
  • Low cost
  • High efficiency, over 87% average efficiency
  • Low standby power consumption, under 50mW
Output voltage options PMP10351.1
Vin (Min) (V) 85
Vin (Max) (V) 265
Vout (Nom) (V) 12
Iout (Max) (A) 1.5
Output Power (W) 18
Isolated/Non-Isolated Isolated
Input Type AC
Topology Flyback- DCM^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.

TIDU587.PDF (5477 K)

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

TIDRB68.PDF (127 K)

Detailed schematic diagram for design layout and components

TIDRB69.PDF (82 K)

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

TIDRB70.PDF (52 K)

Detailed overview of design layout for component placement

TIDC695.ZIP (171 K)

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

TIDRB71.PDF (169 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Flyback controllers

UCC28713Constant-voltage, constant-current PWM with PSR, valley switching, NTC option, and 300mV cable comp.

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
Test report PMP10351 Test Results Oct. 10, 2014

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