Patent ID: 6072289
Filing Date: 2000-06-06
Classification: G11B,H02P

Abstract:
A system for controlling slew rate in a motor control circuit for a motor, the system comprising:a high side switching device coupled to a coil of the motor, the high side switching device operable to control a voltage excitation signal applied at the coil; anda high side slew rate control circuit operable to control a slew rate of the voltage excitation signal, the high side slew rate control circuit including:an amplifier having an output coupled to an input of the high side switching device,a current sink coupling a first input of the amplifier to ground,a capacitor further coupling the first input of the amplifier to ground,a feedback path from an output of the high side switching device to a second input of the amplifier, anda transistor coupled to the amplifier output and ground, the transistor operable to reduce the voltage at the high side switching device input to the input threshold voltage of the high side switching device.