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DRV8432: Application inquiry

Renan Santos Adriano
Genius 16500 points

Part Number: DRV8432

Hello Team,

My customer would like to know if the device fails and it does not do any error reporting via its fault pins, does it simply just not work or could it potentially damage external circuitry if there isn't a protection in place (fuses on power lines)? They do not have an instance to share in which the device did not trigger a fault. Just wondering what would happen to the outputs (OUT_A, OUT_B, OUT_C, OUT_D) of the device if it stopped working altogether. Do you think it's necessary to have external protection in addition to the built-in protection of the IC?

Regards,

Renan

  • 0
    TI__Mastermind 37683 points

    Hi Renan,

    The FAULT pin is open drain so it requires a pull-up resistor. Any fault resulting in a device shutdown like overtemperature, overcurrent, and undervoltage, will result in FAULT signal going LOW. But for overtemperature warning, only OTW will go LOW while FAULT remains HIGH. The Tables below explains the error reporting logic.

    In the case that the fault monitoring circuit is damaged, a fault may not be reported and may fail to protect the device. If this occurs, the outputs and devices will remain in normal operation despite a fault happening. However, this seldom occurs since at that point, the damage may be severe that the device will not be operating properly. However, you are free to include any external protection but it is not required.