JAJSO55 December 2022 DRV8317
PRODUCTION DATA
A MOSFET over current event is sensed by monitoring the current flowing through each of the FETs. If the current through a FET exceeds the OCP threshold (IOCP) for longer than the OCP deglitch time (tOCP), an OCP event is recognized and action is taken according to OCP_MODE. In order to avoid false trigger of OCP at PWM transitions, due to ringing in the phase voltage, there is a blanking time (tBLANK) applied after each PWM edge. During blanking time, OCP events are ignored.
In DRV8317H, the tOCP is fixed at 0.6-µs (typical), tBLANK is fixed at 0.7-µs (typical) and the OCP_MODE is set to 001b with retry time of 5-ms. In DRV8317S, the tOCP is configured by OCP_DEG, the tBLANK is configured by OCP_TBLANK and the OCP_MODE can be configured in four different modes: OCP latched shutdown, OCP automatic retry with fast and slow retry times and OCP report only.