Motor drive semiconductor integrated circuit and magnetic disk storage apparatus

Abstract

The invention provides a motor drive semiconductor integrated circuit for driving and controlling a voice coil motor that can conduct a seek operation, a track follow operation and a settling operation through PWM control, has desired control accuracy and can be produced by a CMOS process. In a voice coil motor drive circuit for executing positioning control of a magnetic head by feedback-controlling a driving current of a voice coil motor for moving a magnetic head over a magnetic disk for reading information from a storage track on the magnetic disk driven for rotation while a read state of the magnetic head is being monitored, head movement control such as a seek operation, a track follow operation etc, of the magnetic head is executed by PWM driving on the basis of a command value from a controller.

1 . A motor drive semiconductor integrated circuit for moving a magnetic head over a magnetic disk for reading information from a storage track on the magnetic disk driven for rotation by conducting feedback control of a driving current flowing through a coil of a voice coil motor while detecting the driving current, wherein a seek operation and a track follow operation of the magnetic head as current control for moving the magnetic head on the basis of a command value from a controller are executed by pulse width modulation (PWM) driving.