DRV8833: Forward and reverse switching is abnormal

Hi Team,

The driver board is a verification board purchased online.

When trying to switch between forward and reverse, AIN1 and AIN2 will first switch to 0 for a few nanosec, and then switch states (0<->1).The output of AOUT1 and AOUT2 will change to the waveform as shown below. At this time, the nFault pin is low and the motor stops.

When trying to change the circuit to parallel mode operation (as shown below), although the motor can switch forward and reverse correctly, the output waveforms of Aout1 and Aout2 are very strange (as shown on the second picture; there is a very large surge).

Regards,

Annie