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UCC28704: Guidance on Improving Efficiency of Current SMPS Design

Prarthana HN
Prodigy 10 points

Part Number: UCC28704

I am currently working on optimizing the efficiency of an existing SMPS design based on a TI controller, and I would appreciate your guidance in identifying possible improvements.

Below are the details of the present design and snap of schematics is attached:

  • Topology: Flyback converter

  • Controller IC: UCC28704DBVR-1

  • Input Range: 100VAC - 230VAC

  • Output Voltage & Current: 24VDC, 2A

  • Switching Frequency: 60 kHz

  • Measured Efficiency: 55% with the load 0.7A

  • MOSFET / Diode part numbers: STF6N95K5, MURS320-13-F

  • Transformer core & winding details: The transformer uses an EFD25 ferrite core with a primary winding of 60 turns (28 AWG - 2P) , secondary winding of 15 turns (26 AWG - 1P) , and an auxilary winding of 11 turns (28 AWG - 3P) 
    image.png

  • 0
    TI__Intellectual 1120 points

    Hello

    Try to minimize leakage inductance by having tightly coupled winding. Also next, can use SR FET at secondary side instead of diode (D3).

    Can implement active clamping instead of passive clamping which will have feature of ZVS which will lower switching loss.

    Regards

    Rohan