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TPSM82821: Regarding TPSM82821 failure

? ?
Prodigy 20 points
Part Number: TPSM82821

I have been using TPSM82821SILR for about a year,
Suddenly, a burnout occurred on the input power supply side.
Is it possible that the TPSM82821SILR causes burnout?

The output power is the FPGA core voltage (1.2V).

  • 0
    TI__Expert 6510 points

    Hi,

    What do you mean by "burnout occurred on the input power supply side" exactly?

    Could you please add the schematic for this application.

    In general, the device has a Switch Current Limit and Hiccup Short Circuit Protection, so the TPSM82821 is protected against a higher current on the output.

    Best regards, Sepp

  • 0 in reply to Josef Marsmann
    Prodigy 20 points

    Hi Josef,

    Thanks for the answer.

    Add schematics and component photos.
    As the photo is attached in the attached document,
    You can see that the solder on the 5V input section is melted.
    However, no abnormality is observed in the output section.
    A short circuit occurs inside the TPSM82821SILR,
    We believe that the device has been burnt out.

  • 0 in reply to ? ?
    TI__Expert 6510 points

    Hi,

    Could you please send me the picture of the module with much higher resolution.

    I  see a lot of solder on the left side of the TPSM82821SILR which should not be there. This could be probably the reason of a short.

    A second possibility could be a over voltage peak on the input pin (VIN max = 5.5V) !

    You can de-solder the device and do a simple resistance comparison with a good device to see which pin is damaged.

    Some additional comments:
    - The feedback divider is designed with very low resistance which makes the efficiency very bad. I would recommend to use 10k...100k.
    - The C4 calculation isn't correct in your schematic.
    - If you are changing R1 and R2 you have to calculate C4 according the data sheet. 

    Best regards, Sepp

  • 0 in reply to Josef Marsmann
    Prodigy 20 points

    Hi Josef,

    Upload high resolution photos.

    TPSM82821SILR's vin and GND are shorted.

    If an overvoltage occurs on the input pin,
    Will the TPSM82821SILR fail due to a short between vin and GND?


    Regarding comments R1 and R2,
    It was 10kΩ due to a typo in the circuit diagram.

  • +1 in reply to ? ?
    TI__Expert 6510 points

    Hi,

    Thanks a lot for the new picture.

    You said: "TPSM82821SILR's vin and GND are shorted", shorted in the device (The module was removed  from the board and cleaned up) or from outside due to the solder.

    If an overvoltage occurs on the input pin, the device could be damaged, probably a short from Vin to GND. If you have a powerful 5V supply you can have a higher current flowing from the VIN pin to GND. But this doesn't explain the amount of solder on the module.

    The picture looks like that the short is due to a lot of solder outside the device, correct? 

    Best regards, Sepp

  • 0 in reply to Josef Marsmann
    TI__Expert 6510 points

    Hi,

    If you don't have further question please push the "Resolved" button to close the thread.

    Best regard, Sepp