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TPS2490: Could you please give me any countermeasure against short between drain and gate of the external NMOSFET?

Kazuya Nakai59
Guru 21595 points
Part Number: TPS2490

 Hello guys,

 One of our customers is evaluating TPS2490 on their own board for their new products.

 They found one problem when they executed their worst case scenario test. They found the external NMOSFET controlled by GATE terminal of TPS2490 was broken when the FET drain terminal was shorted to gate terminal. The customer knows why the FET was broken. But they want to know any countermeasure to avoid breaking the NMOSFET.

 Could you please give me any countermeasure against short between drain and gate of the external NMOSFET?

 Your reply would be much appreciated.

 Best regards,

 Kazuya Nakai.

  • 0
    TI__Guru** 105361 points
    Hi Kazuya Nakai,

    Thanks for reaching us.
    When is this worst case (drain terminal SHORT to gate terminal) expected in the system.? and under which condition failure happened? Is it in system running condition or OFF condition.?
    What is the input voltage?

    Best Regards,
    Rakesh
  • 0 in reply to Rakesh
    Guru 21595 points
    Hi Rakesh,

    Thank you for the prompt reply.

    I'm afraid that I don't know how much the failure case possibility is. This test is one of their reliability tests they must test in prior to their products releasing to market. The input voltage is 24V and their output current is about 15A. They execute this test in system running condition.

    Could you give me your idea if you have any one?

    Thank you very much again and best regards,
    Kazuya Nakai.
  • 0 in reply to Kazuya Nakai59
    TI__Guru** 105361 points

    Hi Kazuya Nakai,

    TPS2490 has 2mA pull-down current which could be one of the reason. We can improve the turn-off response of TPS2490 with additional circuit at GATE so that the FET gets fast turn-off during any abnormal event.

    Please check with below circuit at GATE and let me know.

    Best Regards,

    Rakesh

  • 0 in reply to Rakesh
    Guru 21595 points
    Hello Rakesh,

    Thank you for your reply. I got it.

    Best regards,
    Kazuya Nakai.