Valley Switching Flyback with 85 to 265VAC Input (48V @ 0.625A) Reference Design


Design files


The PMP12027 reference design uses the UCC28740 flyback controller to generate a 48V/625mA output from a universal AC input.  The valley switching of the UCC28740 allows this design to achieve a maximum load efficiency over 90%; no load losses are less than 100mW. The constant current regulation mode of the UCC28740 provides accurate current limiting.

  • Over 90% average 4 point efficiency
  • Standby (no load) power consumption is less than 100mW
  • Conducted emissions are below Class B levels
  • Accurate current limiting
Output voltage options PMP12027.1
Vin (Min) (V) 85
Vin (Max) (V) 265
Vout (Nom) (V) 48
Iout (Max) (A) .625
Output Power (W) 30
Isolated/Non-Isolated Isolated
Input Type AC
Topology Flyback
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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


Includes TI products in the design and potential alternatives.

Flyback controllers

UCC28740Constant-Voltage, Constant-Current (CVCC) Flyback controller with Secondary Side Regulation (SSR)

Data sheet: PDF | HTML
Shunt voltage references

TL431Adjustable precision shunt regulator

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Test report PMP12027 Test Results (Rev. A) Mar. 28, 2016

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