I have a custom board with a DRV8301 driving a 3-phase PMSM motor.
When I apply 50% duty-cycle pwm to the three phases, that is, motor is stoped,
fault pin goes high and low
however, when pwm duty-cycle is not 50% , that is, motor is rotated,
fault pin goes high, no problem.
and OCTW pin goes always high.
there are operation information of my custom board here:
PWM frequency : 10KHz
PVDD : 24V
GVDD : about 10V
FET : CSD18533Q5A, Qg=29nC
there are schematic and layout here:
and there is snap shot :
Do you have any idea what I should try?
thanks for reading.