Primary-Side Regulated Flyback with 85 to 265VAC Input (12V @ 1A) Reference Design


Design files


The PMP8780 reference design uses the UCC28700 primary-side regulated flyback controller to generate a 12V/1A output from a univeral AC input. The valley switching of the UCC28700 allows this low-cost design to achieve an average efficiency over 83%; no load losses are less than 40mW.

  • Over 83% average efficiency
  • Primary side regulation eliminates optocoupler and error amplifier for a low cost solution
  • Meets Class B conducted EMI emissions
Output voltage options PMP8780.1
Vin (Min) (V) 85
Vin (Max) (V) 265
Vout (Nom) (V) 12
Iout (Max) (A) 1
Output Power (W) 12
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.

TIDUAV5.PDF (2677 K)

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

TIDRI42.PDF (122 K)

Detailed schematic diagram for design layout and components

TIDRI43.PDF (79 K)

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

TIDRI44.PDF (54 K)

Detailed overview of design layout for component placement

Technical documentation

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Type Title Date
* Test report PMP8780 Test Results Oct. 07, 2015

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