| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a motor drive that can achieve high control speed. <P>SOLUTION: In a configuration including NMOS transistors MN2 and MN3 for driving a motor section 100 and a waveform forming section 101 for controlling the MN2 and MN3, a brake control section 107 performing short brake control when the motor is decelerated to a target rotational speed is provided. When the rotational speed detected at the motor section 100 does not fall within a predetermined range based on the target rotational speed and a deceleration signal is inputted, the brake control section 107 outputs a brake signal. The waveform forming section 101 receives the brake signal and turns a plurality of transistors (including the MN2) being connected to the power supply voltage Vdd side off entirely, and turns a plurality of transistors (including the MN3) being connected to the ground voltage Vss side on entirely. When the detected rotational speed falls within the range of the target rotational speed, the brake signal is released and transition is made to normal PWM control. <P>COPYRIGHT: (C)2008,JPO&INPIT |
