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LM5116: Undershoot @ LO-GND or HO-SW

Martin Seeger
Expert 5411 points
Part Number: LM5116

Dear Team,

our customer sees a negative undershoot with about -1.5V @ LO-GND or HO-SW for ~5ns.

The specs of the device mention a max value of -0.3V.

Is this short undershoot a problem for the device?

Are there recommendations how to lower such an undershoot, like a snubber or cap?

Thanks and best Regards
Martin

  • 0
    TI__Guru**** 191445 points

    I do not support LM5116 directly, but I can tell you it is practically impossible to eliminate these types of switching transients.  The -0.3 V specification is most likely a dc specification taken directly from the process specification.  Many of our devices have a transient specification in the absolute maximum table to cover this situation.  For some reason, LM5116 does not address this.

  • 0 in reply to JohnTucker
    TI__Expert 5411 points
    Hello John,
    great, thanks for the answer.
    I will look tomorrow for a similar part, just to get a feeling of the ball park what the spec allows.

    Question to a colleague who supports the device: Should we take care of the transient or is it still in an acceptable range?

    Thanks and best regards
    Martin
  • 0 in reply to Martin Seeger
    TI__Guru 73072 points

    Hi Martin,

    The transient specs you provided do not pose an issue for the LM5116.

    Regards,

    Tim