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TPS63060: SW waveform undershoot

Dice-K
Mastermind 7308 points
Part Number: TPS63060

Tool/software:

Hi support team,

The undershoot of L1 has a peak of about -2.0V over a period of 16ns.


Although it exceeds 10ns, can we assume that it is not a problem because the effective value is low?

Regards,

Dice-K

  • +1
    TI__Mastermind 31220 points

    Hi  Dice,

    Yes, your suspicion is completely resonable.No concern from my side about the negative voltage in waveform.

    One thing i want to remind is that it is not easy to get a true spikes, short ground spring is necessary for this test.

    Regards

    Tao

  • 0 in reply to Tao Zhang
    Mastermind 7308 points

    Hi Tao,
    Thank you for your reply.

    I have understood that this level of undershoot is not a problem.

    Since the measurement was made by connecting the GND part of the probe tip to the nearest GND pattern, I do not think that the undershoot is caused by probing.

    Will the undershoot be improved by attaching an RC snubber to L1?

    Best regards,
    Dice-K

  • +1 in reply to Dice-K
    TI__Mastermind 31220 points

    Hi  Dice,

    Ok. what i want is just make sure the waveform got is as close as real one. one more thing to remind is that this spike should be captured under maximum Iout in your application, also lowest Vin.

    Yeah, RC snubber is helpful. Since there is no risk, do not recommend to add because the decreasing of efficiency caused by snubber.

    Regards

    Tao