BOOSTXL-DRV8323RH: 1x PWM Mode

I amtrying to drive a 3 phase BLDC motor using BOOSTXL-DRV8323RH EVM Board. The motor runs smoothly when INHA pin is fed an analog voltage via onboard potentiometer pot.

When I supply the voltage to INHA Pin via Arduino PWM the motor rotates with a rough noise. Only when PWM Duty cycle approaches close to 90% does the motor show smooth rotation.

(Arduino freq is 490 Hz).

Please shed some light on the cause and probable rectifications. Thank You.