Hello, Team
Could you tell me when to start counting the time set in the OCP_DEG register of DRV8343-Q1?
For example, after being activated with VINHx= 'H' → 'L', does the count start counting when it first exceeds VVDS_OCP and reset the count when it falls below VVDS_OCP?
Also, if the VVDS_OCP threshold is continuously exceeded by 2.5us (when OCP_DEG=000b is set), FAULT status(addr.00h) -OCP (bit3) = '1'.
Is my understanding correct?
Best Regards
manabu
Hi Manabu,
For OCP to trigger a few things need to be taken into account for your example
- VVDS_OCP: VDS overcurrent trip voltage
- tOCP_DEG: VDS overcurrent deglitch time
- tretry: Overcurrent fault retry time
In your example setting OCP_DEG=000b will equal tOCP_DEG=2.5us. The count will start once the VVDS_OCP value is exceeded.
for a retry to occur like you mentioned then OCP_MODE =01b where retry: TRETRY= xxb
You are correct in the FAULT Status Register (Address = 0x00) [reset = 0x00] bit3 = 1 if the VDS_OCP continues to exceed 2.5us. The TRETRY value will then wait the set amount of time before detecting a fault. If the VVDS_OCP value is exceeded nFAULT will report and the driver will be in Hi-Z. If no overcurrent is detected after the the TRETRY time, the gate driver will resume operation.
Best,
Sarah
