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

Claim 10:
11. 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;
a current sense amplifier that generates a current feedback signal based on a voltage drop in the sense resistor;
a feedback controller that generates a voltage command value so as to make the current feedback signal close to a reference signal;
a pulse width modulator that generates a first pulse and a second pulse having complementary duty cycles according to the voltage command value in such a way that a center of a high section of the first pulse matches with a center of a high section of the second pulse; 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
the feedback controller includes
an analog-to-digital converter that obtains a digital signal by converting an analog signal corresponding to the current feedback signal to the digital signal, and
a digital circuit that generates the voltage command value by processing the digital signal, and,

during a first mode, the digital circuit uses the digital signal obtained by the analog-to-digital converter at a negative edge timing of the first pulse, for the digital signal at a positive edge timing of the second pulse.