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Original question:

TPS1H000-Q1: reverse protection for TPS1H000-Q1

TPS1H000-Q1: Reverse polarity protection

Gurumoorthy Santhanam
Prodigy 20 points
Part Number: TPS1H000-Q1

Hi,

I am using the TPS1H000 for functional safety applications.I have fault scenario of injecting negative voltage (-60V) at VCC_OUT in my circuit due to miss-wiring and wrong connections. Can the TPS1H000 withstand or survive when the OUT pin voltage is -60V and VS is supplied with 24V?

  • 0
    TI__Genius 12410 points

    Hello,

    The inductive clamp will kick in when VDS is 40V so the output voltage will not go to -60V. If it does the device will break.

  • 0 in reply to Cameron Phillips
    Prodigy 20 points

    Hi,

    I have not fully got the answer.

    I am looking for the fault condition of -60V with constant supply at OUT pin. In some cases the customer can miss interrupt the output and inputs. So they can connect 60V supply this output and miss wire (reverse polarity connection) can create -60V. This is not an inductive kickback.

    When the -60V is constantly available at OUT pin, with VS=24V, can the device survive?

  • 0 in reply to Gurumoorthy Santhanam
    TI__Genius 12410 points

    Hello,

    I understand that this is not an inductive kickback. However we have an internal clamp that turn on the FET during an inductive kickback that will turn the FET on if VDS is >40V. Therefore if you connect -60V to the output you are turning on the clamp and trying to drop 24 - (-60V) = 84V across 1Ohm (2Ohm max) which gives you 84A. The device will surely be damaged.

    No this device will not working in an application where you can have 24V at VS and -60V on the output.