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UCC28610: UCC28610 Brown out

John Hsiao
Prodigy 445 points
Part Number: UCC28610

When UCC28610 detect brown out threshold, how fast controller will stop switching? Since it did not specify on datasheet, thanks.

  • 0
    TI__Guru 70515 points

    Hello John,

    The converter will not shut down to a fault unless it has occurred in 3 switching cycles.  So the input under voltage needs to be detected in three consecutive switching cycles.

    Even though the delay is not specified the ZCD delay of 150 ns is specified.  So the delay time after initial brownout could vary from

    3/fmin + 150ns to 3/fmax + 150 ns.

    Also note when the line is removed there will be a delay due to the bulk capacitor discharge.

    dt = (Cbulk/Iin)*(Vin - Vin@BrownOut.

    So the total variation would be

    (dt+3/fmin + 150ns) to (dt + 3/fmax + 150 ns.)

    Regards,

  • 0 in reply to Mike O'
    TI__Prodigy 445 points

    For overload detection, is it the same converter will not shutdown to a fault unless it has occurred in 3 switching cycles?

  • 0 in reply to John Hsiao
    TI__Guru 70515 points

    Hello,

    I believe this is correct.

    Regards,