Patent ID: 11949363
Assignee: ROHM CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 0:
1. A motor driver circuit comprising:
a first output terminal to be connected to a first end of a to-be-driven motor via a sense resistor;
a second output terminal to be connected to a second end of the motor;
an error detector that generates an error signal based on an error between a reference signal and a current feedback signal which is based on a voltage drop in the sense resistor;
an analog-to-digital converter that obtains a digital signal by converting the error signal to the digital signal;
a compensator that generates a voltage command value on a basis of the error signal obtained by the analog-to-digital converter;
a digital-to-analog converter that converts the voltage command value to an analog control signal;
a pulse width modulator that generates a first pulse by comparing the analog control signal with a first triangular wave and generates a second pulse by comparing the analog control signal with a second triangular wave of a phase opposite to that of the first triangular wave; and
an output stage that generates, at the first output terminal, a first driving voltage corresponding to the first pulse, and generates, at the second output terminal, a second driving voltage corresponding to the second pulse, wherein,
during a first mode, the compensator uses the error signal obtained by the analog-to-digital converter at a negative edge timing of the first pulse, for the error signal at a positive edge timing of the second pulse.