Hi Mickey,
Responses to the customers questions are below.
Q1: Locked Rotor Question
RLOCK is considered a FAULT. For normal stopping operation, the motor should not flag an RLOCK fault. If the BRAKE pin is used to stop the motor, the PWM signal should be brought to zero as well. This will allow for normal operation of the device.
Your understanding is correct, the device will restart after 5s.
Q2: PWM Control Question
Depending on the motor selected by the customer and the intended load for their application, they may be able to increase the speed in large steppers. The main concern is locking the rotor due to large step changes in commutation.
Q3: LOCKn Pin Question
For the DRV8307, the LOCKn pin will be pulled low when the motor has reached a constant speed. This device operates in open loop at all times. If the customer does not want to use the LOCKn pin, it can be left floating in their design.
Q4: This device should be suitable for this application. For faster starting and stopping, see section 8.1.3 of the datasheet.
Q5: This device should be suitable for position control.
