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TPS2121: TPS2121 low impedance at some pins

user6010589
Prodigy 60 points
Part Number: TPS2121

Dear Ti,

Please help to check, the TPS2121 is low impedance at some pins. Please see the attached file.

Thanks.

SmallNew Failure analysis request form_ET5X.DOC

  • 0
    TI__Genius 10855 points

    Hi Small, 

    Thanks for reaching out on E2E!

    Have you already submitted the FA request? Taking a look a the initial file, I have a few questions to help me clarify my understanding of the application:

    • When does the device fail? You mentioned "12V input and no power insert check", does that mean that you're hotplugging the 12V input and the device is failing?
    • What is the output load when it fails?
    • Any oscilloscope shots of the behavior that you can share?

    Let me know if you have any questions.

    Thanks,

    Arthur

  • 0 in reply to Alpha H
    Prodigy 60 points

    Dear Arthur,

    Yes, I had already submitted the FA request. The vendor will take the NG part away.

    Yes, hotplugging and 12V input function(to charge our Tablet product).

    There is no output. When output, it shall from 12V down convert to 9V/1~3A for charge the table.

    Sorry, no oscilloscope shots. We only use multimeter to measure.

    Thanks.

    Small

  • 0 in reply to user6010589
    TI__Genius 10855 points

    Hi Small, 

    I took a look at the schematic. You have a 24 TVS on the input, which I recommend switching to a 18V or lower TVS. During the hotplug event, if you're using long cables, there can be a spike of voltage on the input (V = L * di / dt). If you are using the TPS2121 in a hot plug configuration, I recommend putting a TVS near the device to suppress the voltage spike.

    Is it possible to use an oscilloscope to capture the hot plug event? This will show us if the device is being hot plugged or exceed the absolute max of the device.

    Thanks,

    Arthur Huang