MOTOR DRIVING CIRCUIT AND METHOD, AND COOLING DEVICE AND ELECTRONIC APPARATUS USING THE SAME

摘要

A driving device capable of driving a motor more efficiently is provided. A zero-crossing detection comparator 10 compares a pair of Hall signals H+ and H− having reverse phases and representing a rotor position of a fan motor 6, and generates a level-shifted zero-crossing detection signal S1 at each zero-crossing timing when the Hall signals cross each other. A control circuit 20 receives the zero-crossing detection signal S1, switches a driving phase at each zero-crossing timing to rotationally drive the motor, and regeneratively controls the motor during a duration from a first time point ahead of each zero-crossing timing by a first time width τ1 to a second time point behind each zero-crossing timing by a second time width τ2 shorter than the first time width τ1.