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TPS2546: TPS2546RTER

Daniel Belzile
Prodigy 20 points
Part Number: TPS2546

Dear TI,

We are using this TPS2546RTER IC is one of our RUP (Remote USB Port) design.

I recently received from the field two of these RUP equipped with IC TPS2546RTER burnout. Take note that this is very isolated case (2 out of thousands in service).

I am trying to duplicate this burnout condition by creating a short on the USB port with no success (the IC comes hot (approx 90 degrees C on IC body but do not burn out).

I am trying to identify the root cause but can only suspect a defective IC or liquid contamination (no obvious trace) at this time.

Have you ever seen such a burnout condition and if so, what can be the cause(s) ? Here is a picture so you can see by yourself.

Regards,

Daniel Belzile

Inflight Canada Inc.

Quality Manager

  • 0
    TI__Genius 9630 points

    Hi Daniel,

    I have never seen this type of burnout from this device. If you are able to reproduce the fail, and can capture some scope shots, I can help further identify the root cause. 

    Thanks,

    Emma

  • 0 in reply to Emma Hoying
    Prodigy 20 points

    Hello Emma,

    I have tried to re-created this burnout condition without success to date. I have tested with prolonged USB Port short conditions (USB+ short to USB-, all four pins (USB+, USB-, USB data and chassis grounded together) without any success.

    One of my designer is proposing to perform an " input over voltage" test to see how it will react with voltage above 5.5V with a disabled input voltage limiter. Update to follow.

    Be assure that you will be the first one to know when I can reproduce this burnout condition, if ever one day I can.

    Thanks for your fast reply.

    Regards,

    Daniel Belzile

  • 0 in reply to Daniel Belzile
    TI__Genius 9630 points

    Hi Daniel,

    Sounds good. I'll await your update.

    Thanks,

    Emma