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TPS40210-Q1: ISNS pin is shorted to GND

K.Hamamoto
Guru 12155 points
Part Number: TPS40210-Q1
Other Parts Discussed in Thread: TPS40210

Hi

Our customer evaluates this device on their board (flyback topology)

At their abnormal test, the external MOSFET has been broken when they shorted the ISNS pin to GND.

We do not have any clue why the MOSFET has been broken. Because we had assumed only the OCP function has stopped when the ISNS pin is shorted to GND.

Could you give me any idea (guesses) why the MOSFET has been broken?

Regards,

Koji Hamamoto

 

  • 0
    TI__Mastermind 24075 points

    Hi Koji,

    What's the test condition when FET dmage happened, during Vin power, steady state, or other condition?

    Why does customer want to disable OC?

    Thanks

    Qian

  • 0 in reply to Qian Chen
    Guru 12155 points
    Hi Qian-san,

    Thank you for your support as always.

    It is at steady state.

    >Why does customer want to disable OC?

    No. The customer has tested just like for Pin FMEA. Because this application is for Automotive.
    And they would like to know why this phenomenon happen.

    Regards,
    Koji Hamamoto
  • 0 in reply to K.Hamamoto
    TI__Mastermind 24075 points

    Hi Koji-san

    After ISNS is shorted to GND, the TPS40210 circuit can not protect itself when there is a OC or short circuit condition.

    Is it possible that OC or short circuit happened during the test?

    TPS40210 is a current mode controller.

    Can you check if the loop is stable when ISNS is shorted to GND?

    Also, please check if the voltage spike on SW becomes larger after ISNS is shorted to GND?

    Thanks

    Qian

    Thanks

    Qian