In DRV10974 mounted on the PCB I designed, even if the PWM pin is plulled up or down and no PWM signal, a regular voltage is output to the U,V,W pin. Therefore, current flows to the motor at this timing. When the motor is removed, no current flows, but the U,V,W pin continues to output voltage.
Since I also own an evaluation board, I confirmed under the same conditions. As expected, the U,V,W pin remains at GND level and no current flows into the motor. When the motor is connected and other signals such as PWM are input, the expected operation can be confirmed.
Should I suspect a motor driver failure?
I will attach the target schematic diagram and the output waveform of each U,V,W pin.
The introduction of the motor is as follows.
Type : Sensorless 3 phase BLDC w/ neutral point
Nominal voltage : 6V
Maximum continuous current : 0.2A
Resistance between 3 terminals : 18.1 ohm
Thank you.
