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TPS4H160-Q1: Not latching off when output is short-circuited

Yuto Hori
Prodigy 360 points
Part Number: TPS4H160-Q1

Hi team,

Customer have a question about latch off operation for TPS4H160A.

They found the phenomenon that the output voltage was restored without latching off when the output was short-circuited.

Have you seen a similar phenomenon to this? What are the possible reasons for not latching off?

Your support is highly appreciated.

  • 0
    TI__Mastermind 32650 points

    Hi Yuto,

    This might be because the device is hitting thermal swing during the short to GND event and not thermal shutdown.

    The device does not latch when thermal swing is triggered but when the junction hits the thermal shutdown threshold then latching can occur. This is described in the fault table on the datasheet.

    This is possible in the customer application since the short to GND event is a high power event causing the FET to heat up faster than the controller resulting in thermal swing followed by retry. Eventually, when the junction hits thermal shutdown, the device should latch off.

    Thanks,

    Shreyas