Patent ID: 9054607
Filing Date: 2015-06-09
Classification: G11B,H02P

Abstract:
1. A motor drive device comprising: a spindle motor driver adapted to drive a spindle motor, wherein the spindle motor driver includes: lower side NMOSFETs, one for each phase, which connect and disconnect terminals, one for each phase, of the spindle motor to and from a ground terminal; a controller adapted to generate a switch control signal and a brake control signal; lower side pre-drivers, one for each phase, connected between an application terminal of an internal power supply voltage and the ground terminal and adapted to generate lower side gate signals, one for each phase, in accordance with the switch control signal to output the lower side gate signals to the lower side NMOSFETs, one for each phase; and a brake unit adapted to pull up to the internal power supply voltage all the lower side gate signals, one for each phase, in accordance with the brake control signal, wherein the motor drive device further comprising: an internal regulator which the internal power supply voltage from an input voltage, wherein an output terminal of the internal power supply voltage is connected to a capacitor for smoothing an output.