| 摘要 |
<p>A motor drive circuit (100) supplies a drive current to a motor (2) so as to drive the motor (2). A first hole amplifier HAMP1 to a third hole amplifier HAMP 3 are arranged for each of the phases of the motor (2) so as to receive a hole signal pair from a hole of the corresponding phase and amplifies a difference of the hole signal pair so as to generate sinusoidal wave voltages SIN_U, SIN_V, SIN_W for each of the phases. A first PWM comparator PCM1 to a third PWM comparator PCMP3 are arranged for each of the phases of the motor (2) so as to compare the sinusoidal wave voltages SIN_U, SIN_V, SIN_W of the corresponding phase to a cyclic voltage Vosc and generate PWM signals PWM_U, PWM_V, PWM_W for each of the phases. A drive unit (10) pulse-drives a coil of the phase to be driven, by using a PWM signal from the PWM comparator of the corresponding phase.</p> |
