The FAULT and OC outputs form a fault reporting scheme together. They are both push-pull outputs indicating the readiness and fault status of the driver. These two pins are logic high in normal operation, and will change logic according to Table 9-1.
|NORMAL||UVLO, OT, and RDRV-OPEN||OVERCURRENT||SHORT-CIRCUIT|
FAULT is held low when starting up until the series Si FET is turned on. During operation, if the power supplies go below the UVLO thresholds or the device temperature go above the OT thresholds, power device is disabled and FAULT is held low until the power supplies or the device temperature recover. If RDRV is open, FAULT is also held low. In an short-circuit or overtemperature fault condition, FAULT is held low until the fault latches are reset or fault is cleared. The OC pin will be held low if there is a short-circuit or overcurrent fault. The signals help notify the controller the exact type of faults by reading the truth table. If a combined reporting of the faults on a single pin is desired, one can short the OC pin to ground during power up. All faults will assert the FAULT pin then and the OC pin will not be used. Internal protection happens regardless the connection of pin outputs, however.