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TPS40210: ISNS pin short to GND

K.Hamamoto
Guru 12155 points
Part Number: TPS40210

Hi

Our customer would like to know how this device work at some abnormal case like pin FMEA. 

If ISNS pin is shorted to GND pin (neighbor pin), how does this device work?

We understand the over current protection does not work. However does this case affect to current mode control operation?

We would like to know the behavior more detail about at abnormal case.

Regards,

Koji Hamamoto

  • 0
    TI__Guru* 78240 points
    Hi Hamamoto-san,

    We don't have a pin FMEA at this moment. However, the failure in the ISNS pin can be easily predicted. The TPS40210 is a peak current mode controller, the PWM generator relies on the current sense signal to determine the duty cycle. Once the ISNS pin is grounded, the device lose the info of the current sense info, the circuit become open loop and the duty cycle can become the maximum. Consequently the output will lose voltage regulation, and the worse the power inductor, or the power transformer of the flyback converter, may get saturated and damage can be caused.

    Hope this clarifies.

    Thanks,
    Youhao Xi, System and Applications Engineering, APP-BMC-BCS, TI