Primary-Side Regulated Flyback with 85-265VAC Input (12V @ 3W) Reference Design


Design files


The PMP8869 reference design uses the UCC28700 primary-side regulated flyback controller to generate a 12V/250mA output from a universal AC input. The valley switching of the UCC28700 allows this low-cost design to achieve a maximum load efficiency over 80%; no load losses are less than 30mW. This circuit fits onto a 23mm x 37mm PCB.

Output voltage options PMP8869.1
Vin (Min) (V) 85
Vin (Max) (V) 265
Vout (Nom) (V) 12
Iout (Max) (A) .25
Output Power (W) 3
Isolated/Non-Isolated Isolated
Input Type AC
Topology 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.

SLUUAH4.PDF (2292 K)

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

SLURA77.PDF (37 K)

Detailed schematic diagram for design layout and components

SLURA78.PDF (16 K)

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

SLUC458.ZIP (226 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.

AC/DC & DC/DC controllers (external FET)

UCC28700Constant-voltage, constant-current PWM with PSR & Programmable cable compensation

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
Test report PMP8869 Test Results May 17, 2013

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