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TIDM-PSFB-DCDC: Secondary side rectification

toktam khani
Prodigy 90 points
Part Number: TIDM-PSFB-DCDC

Hi, 

TIDU248 uses a center-tap synchronous rectification for the secondary. can you tell me what is the application of D4/D6 in the schematic? how does it work?

Best Regards

Toktam Khani

  • +1
    TI__Genius 15555 points

    Hi Toktam,

    It is a passive snubber to attenuate ringing on the SR MOSFET drains. When the SR FET drain voltage flies up at the turn off edge of the SR, the diodes provide a path for the leakage energy to be transferred into C1 and limit the max voltage stress seen by the SR FET.  

    Regards,

    Chen