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TPSM365R6: Power supply is failing above VIN = 40V (burned)

eran priel
Prodigy 30 points
Part Number: TPSM365R6

Tool/software:

Hi,

I am using the below schematic:

Up to VIN < 40V the output seems to be stable at 3.3V.

Above VIN = 40V, the IC upon power-up immediately defects resulting in a short-circuite between VIN and VOUT.

All peripherals components are selected per your recommendation (TDKs ones).

Please advise.

Thank you, 

Eran.

  • 0
    TI__Mastermind 28070 points

    Hi Eran,

    The schematic generally looks fine, have you checked if this issue has been replicated across multiple known good units? It may be that the current iC was damaged through alternative means, and it may be fine if swapped with a fresh unit. 

    Thanks,

    Richard

  • 0 in reply to Richard Fu22
    Prodigy 30 points

    Hello Richard,

    Thank you for the feedback.

    Yes, the problem has been replicated across multiple newly assembled ICs. They all behave the same, stable up to VIN ~40V, damaged immediately after powerup after VIN > 40V.

    Thanks,

    Eran.

  • 0 in reply to eran priel
    TI__Mastermind 28070 points

    Hi Eran,

    It may be an issue with the implementation of the design, it sounds like a thermal issue.

    For your application condition, your ambient should be below 85 degrees, can you confirm that? Any scope shots you may have will also be useful in helping to debug.

    Finally, can you get in contact with your local FAE to provide you a TPSM365R6EVM? In the user's guide, you can see that the design is able to run at 1MHz and can support input voltages up to 54-V without damage.

    Thanks,

    Richard