If the VGS voltage does not cross the
the VGS_LVL comparator level for longer than the tDRIVE time, a
VGS gate fault condition is detected .
The VGS gate fault monitor can respond
and recover in four different modes set through the VGS_MODE register setting.
- Latched Fault Mode: After
detecting the gate fault event, the gate driver pull downs are enabled and FAULT register bit, and associated VGS register bit asserted.
After the gate fault event is removed, the fault state remains latched until CLR_FLT is issued.
- Cycle by Cycle Mode: After
detecting the gate fault event, the gate driver pull downs are enabled and FAULT register bit, GD and associated VGS_XX register bit asserted. The next PWM input will clear the
FAULT register bit and reenable the driver automatically. The
VGS_XX and GD bits will remain asserted until CLR_FLT is issued.
- Warning Report Only Mode: The
overcurrent event is reported in the WARN and associated VGS_XX register bits. The device will not take any action. The
warning remains latched until CLR_FLT is issued.
- Disabled Mode: The
VGS gate fault monitors are disabled and will not respond or report.