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TPS65261-1: Circuit operation for output short

KIM Andy
Expert 2530 points
Part Number: TPS65261-1

Hi

My current customer is using the TPS65261-1.

There are a lot of field defects in the product and we are looking for the cause of the problem.

Bad phenomenon: LX2 and PGND2 are short-circuited.

Confirmation request

1) In the above bad phenomenon, the vds voltage does not keep 0 but moves at a fixed frequency like hiccup. Why is this happening?

2) The output cap of tps65261-1 was forcibly shorted by 10 times. After that, it was normal in the beginning, but after the aging for about 17 hours, the same defect occurred.

2-1) Is it possible to damage the TPS65261-1 by aging it with the output shorted?

2-1) Continuously shorting the output for a short time during operation generates a spark. Can I damage the IC?

  • 0
    TI__Genius 15135 points

    Hi, Andy

    1. In the above bad phenomenon, the vds voltage does not keep 0 but moves at a fixed frequency like hiccup. Why is this happening?

    [Zhao] It looks a part of low-side MOSFET is damaged, the LX2 and PGND2 are weak short-circuited.

    2-1) Is it possible to damage the TPS65261-1 by aging it with the output shorted?

    [Zhao] No, output shorted should not damage IC.

    2-1) Continuously shorting the output for a short time during operation generates a spark. Can I damage the IC?

    [Zhao] The spark should not damage IC too. 

    Questions:

    Could you send me the schematic and layout?