Patent ID: 8432775
Filing Date: 2013-04-30
Classification: G11B,H02P

Abstract:
1. A motor driving circuit comprising: a spindle motor driver configured to drive a spindle motor; a voice coil motor driver configured to drive a voice coil motor; a switching regulator configured to receive a power supply voltage from an external circuit, and to generate a stabilized voltage; a linear regulator configured to receive a power supply voltage from an external circuit, and to generate a stabilized voltage; a shock detection circuit configured to detect vibrations of a device mounting the driving circuit; a power monitoring circuit configured to monitor the power supply voltage, and to generate a power-on reset signal which is switched to a predetermined level when the power supply voltage is cut off; an analog/digital conversion circuit configured to convert a back electromotive voltage that occurs at the voice coil motor into a digital signal; a serial interface configured to receive, from an external host processor, data which is to be used to control the driving circuit; and a cutoff circuit which is arranged between a power supply voltage terminal and a capacitor which is charged using an induced current that occurs at the spindle motor, and which is configured to disconnect the capacitor from the power supply voltage terminal when the power supply voltage is to be cut off.