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WEBENCH® Tools/LM5161PWPBKEVM: LM5161PWPBKEVM

Mathe Nijskens
Prodigy 110 points
Part Number: LM5161PWPBKEVM
Other Parts Discussed in Thread: LM5161

Tool/software: WEBENCH® Design Tools

Problem with the LM5161PWPBKEVM evaluation board. Startup with 30VDC input voltage works fine, but at instant 60VDC input voltage the device goes immediately defect at no load and in DCM mode? Do you have an explanation and suggestion how to solve this startup problem? Best Regards.

  • 0
    TI__Mastermind 22786 points
    hi Mathe,

    unfortunately I can't understand what issue are you facing...
    the EVM is tested up to 80V input... do you have waveforms to share w/ us?

    KR
    Vincenzo
  • 0 in reply to Vincenzo Pizzolante
    Prodigy 110 points

    Hi Vincenzo,

    Thanks for your reply.

    The problem is that the evaluation board failed (gets defect) by instant connecting a high input voltage (0 to 60VDC). I solved this by adding an NTC and an input capacitor (470uF). But I actually find it onaceptabel that a evalautiebord with specs up to 80V not prepared is for this, and that there is no information/solutions mentioned in the datasheets. Unfortunately this has cost us a lot of extra time!

    Best Regards,

    Mathe

  • 0 in reply to Mathe Nijskens
    TI__Guru**** 191445 points

    While I do not support LM5161 directly, I have a comment.  Hot plugging an input voltage instantaneously to a circuit can cause transient voltages up to 2 times the input voltage.  So by directly connecting 60 V, you may actually over stress the device by a large margin.  Generally this is considered common knowledge.