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TPS1H100-Q1: How to tell fault status when PWMing

Ben holter
Intellectual 255 points
Part Number: TPS1H100-Q1

We are PWMing this (A series) device and reading the fault status asynchronous to the pwm generator. Is there a way to be able to tell the difference between short to battery, short to ground, and thermal shutdown when PWMing the device?

  • 0
    TI__Genius 15465 points

    Hello, 

    For the A version of the device, 

    • The status pin ST will pull low for all short to battery, short to ground, and thermal shutdown conditions. The ST output will not be able to distinguish between the 3 events. 
    • For the user to distinguish between a short to GND and short to battery, the user can see the voltage on the output to conclude the difference
      • If the output is low, there is a short to GND or thermal shutdown/swing event 
      • If the output is high, there is a short to battery event 

    For the B version of the device,

    • During an open load or short to battery condition occuring in the on-state, the CS voltage is almost 0. 
    • Alternatively, when a current limit, thermal shutdown/swing occurs in the off-state, the CS voltage is pulled up to Vcs,h. 

    Best Regards, 

    Elizabeth