7.3.6.1 Overcurrent Protection (OCP)

An analog current limit circuit on each FET limits the current through the FET by removing the gate drive. If this analog current limit persists for longer than the OCP time, all FETs in the H-bridge will be disabled, and the FAULTn signal will be driven low. The device will remain disabled until VCC is removed and re-applied.

Overcurrent conditions are sensed independently on both high and low side devices. A short to ground, supply, or across the motor winding will all result in an overcurrent shutdown. Note that OCP is independent of the current limit function, which is typically set to engage at a lower current level; the OCP function is intended to prevent damage to the device under abnormal (for example, short circuit) conditions.