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DRV8873-Q1: Output Short-to-Battery Protection

Shinichi Yokota
Genius 9715 points
Part Number: DRV8873-Q1

Hello,

I'm wondering how the internal low-side FETs of DRV8873S-Q1 are protected when OUT1 or OUT2 is shorted to battery.

  • Are currents running through the low-side FETs actually monitored? Or, will its overcurrent condition be monitored and protected indirectly by such means as thermal shutdown feature?
  • Is there any restriction on the ramp rate of rising current running through the low-side FET to detect the condition as overcurrent?

Best regards,
Shinichi Yokota

  • 0
    TI__Guru** 114905 points

    Hi Yokota-san,

    • Are currents running through the low-side FETs actually monitored? Or, will its overcurrent condition be monitored and protected indirectly by such means as thermal shutdown feature?

    Each high side and low side FET has an overcurrent circuit to protect the FET. The action taken depends on the register settings.

    • Is there any restriction on the ramp rate of rising current running through the low-side FET to detect the condition as overcurrent?

    There is no restriction. If using a slow rate (2.6V/us or 5.3V/us), please consider using OCP_MODE = 00b (Latched Shutdown).