Voice coil motor control circuit and method for servo system control in a computer mass storage device

摘要: A voice coil motor ("VCM") control circuit controls operation of a VCM which positions disk drive head/actuator arm assembly. data processor is continuously updated with the current position and relative radial velocity The provides signals to digital-to-analog converter ("DAC") representative amount energy necessary move assembly parking from position. DAC generates an analog signal applied capacitor. When undervoltage condition occurs, stored in capacitor amplifier circuitry be used as initial reference are generated park desired