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Original question:

DRV8824's TSD

DRV8824-Q1: Motor Driver Thermal Shutdown

saravanakumar Dinakaran
Prodigy 125 points
Part Number: DRV8824-Q1

Hi,

  One of our requirement has a test to check Over Current Protection(OCP) and Thermal Shutdown(TSD). How to simulate this to get nFAULT pin Low. Kindly help us to resolve this. 

Regards

Saravanakumar D 

  • 0
    TI__Guru 55565 points

    Hello,

    For OCP, the output would have to be shorted to GND or power supply.  There is no way to force the device into an OCP otherwise.

    For TSD, maximum full scale current can be selected to push device into thermal protection.  Or, an external method like forced hot air can be used to push ambient temperature up to cause a TSD.

    Regards,

    Ryan

  • 0 in reply to Ryan Kehr
    Prodigy 125 points

    Hey Ryan,

                     We tried external method, we forced hot air using temperature controlled Hot air gun at 200degree C but nFAULT pin was not driven low. Can you explain how to try the first method to set full scale current?

    Regards

    Saravanakumar D                 

  • 0 in reply to saravanakumar Dinakaran
    TI__Guru 55565 points

    Hello,

    The OCP specifications are in the datasheet.  As long as the short to GND or supply exceeds 5A, the device will report a fault.  It could trip as soon as 1.8A.

    Regards,

    Ryan