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TPS54260: TPS54260 Vin Short issue

Eric Chen4
Expert 2370 points
Part Number: TPS54260
Other Parts Discussed in Thread: TPS54360

Hi,

Now I have testing about TPS54260 Vin Short then got 20A current detection through Scope as below.

Is it normal testing result?

Please kindly provide suggetion for our check again.

Thanks.

Regards,

Erc

  • 0
    TI__Mastermind 25590 points
    Eric,

    Can you please provide some more context. Is the yellow the switch node? Blue is I_IN?

    What are the conditions of this test? Was it operating normally, then this suddenly happens or can you trigger it? Does anything get damaged? Please provide more information.

    -Sam
  • 0 in reply to Samuel Jaffe
    Expert 2370 points

    Hi Sam,

    Yellow waveform is Switching node whwn Vin is 60V input.

    Blue is Vin output current. You can find big current from VIN pin Output then IC failure.

    We just simulation why TPS54260 failure when Vin short then IC no any protection.

    Please kindly provide your suggestion for our check again.

    Thanks.

    Regards,

    Eric

  • 0 in reply to Eric Chen4
    TI__Mastermind 25590 points
    Eric,

    TPS54360 is a 60V part with an abs_max of 65V in VIN and PH. You're applying 60V on the input which means the part is very close to reaching that absolute max. Switch nodes (like the PH pin of this IC) usually overshoot/ring a bit when you turn on the high-side FET. This overshoot could easily go over 65V.

    Check it again with VIN = 50V. See how much it overshoots, then you can see if 60V + overshoot is greater than 65V.

    I would recommend a 75V or 100V part for VIN = 60V so you have enough margin.

    -Sam