| 摘要 |
<P>PROBLEM TO BE SOLVED: To sufficiently increase a rotation speed during high-speed rotation, while reducing noise during low-speed rotation. <P>SOLUTION: A driving circuit of a motor, which drives the motor by supplying a driving current to drive coils of a plurality of phases of the motor comprises a trapezoidal wave signal generating circuit which outputs a trapezoidal wave signal by changing inclination of the signal according to a rotation speed of the motor or a target rotation speed of the motor, and a plurality of output transistors which output the driving current to the drive coils according to the trapezoidal wave signal. <P>COPYRIGHT: (C)2012,JPO&INPIT |
