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Coss of Sync Fet on TPS54610

Ben van den Bergh
Prodigy 30 points
Other Parts Discussed in Thread: TPS54610

Hello, Could anybody please provide me with the Coss value for the "bottom" Sync Fet for the TPS54610

The reason for this is to enable us to calculate the external snubber RC network.

Thank you

  • 0
    TI__Expert 3875 points

    Hi Ben,

    I am not really sure what you mean by "Coss". SwitcherPro uses 330pF as the output capacitance for each of the sync FETs. If this does not answer your question, I can transfer your question to the "Non-Isolated DC/DC" forum.

    Hope this helps,

    Michael

  • 0 in reply to Michael Krasnicki
    Prodigy 30 points

    Yes thank you the information correlates well with the value which I arrived at using an empirical technique

    The process is quite simple, Insert a cap across the snubber position and substitute with different value until the ringing frequency halves

    The value of this cap divided by four is +/- Coss.

    The experimental value was 335pF the cap used measured 1.34nF on our LCR bridge (supposed to be 1.5nF cap).

     

     

  • 0 in reply to Ben van den Bergh
    Prodigy 30 points

    Some additional information that might prove useful to anybody having to implement a snubber

    Application note "slup 100"  Snubber Circuits: Theory,  Design and Application by Philip C Todd.

    proved very informative.