| 摘要 |
The motor drive circuit 100 supplies a drive current to the motor 2 to drive the motor. Each of the first Hall amplifier HAMP1 to the third Hall amplifier HAMP3 is provided for each phase of the motor 2 and receives a pair of Hall signals from a corresponding phase Hall element to generate each phase sine wave voltage SIN_U, SIN_V and SIN_W by amplifying a difference between the pair of Hall signals. Each of the first PWM comparator PCMP1 to the third PWM comparator PCMP3 is provided for each phase of the motor 2 and compares the corresponding phase sine wave voltage SIN_U, SIN_V and SIN_W, with the periodic voltage Vosc to generate each phase PWM signal PWM_U, PWM_V and PWM_W. The drive unit 10 subjects a phase coil, a target to be driven, to pulse drive by using the pulse modulated signal from the corresponding PWM comparator.
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