Patent Number: 7,612,521

Title: Motor driving apparatus

Abstract: In a fan motor drive circuit which drives a motor based on a pulse-modulated external control signal, a temperature control signal generator generates a pulse-modulated temperature control signal whose duty ratio changes depending on temperature. A signal synthesizer synthesizes the external control signal and the temperature control signal by a logical operation. A drive controller drives the motor based on output of the signal synthesizer.

Inventors: Miyajima; Satoshi (Kyoto, JP)

Assignee: Rohm Co., Ltd.

International Classification: H02P 23/00 (20060101)

Expiration Date: 1/03/02017