PWM DRIVER AND OUTPUT OFFSET CORRECTION METHOD THEREFOR

PROBLEM TO BE SOLVED: To provide a PWM driver in which the variations in the gain due to individual variation or the temperature variation is lesserred. SOLUTION: The PWM driver, for driving a load by PWM control depending on a command voltage, comprises a first voltage/current converter (12) for converting the differential voltage, between a command voltage and a reference voltage, into a current; a second voltage/current converter (14) for converting the differential voltage between the positive output terminal and the negative output terminal of the PWM driver into a current; a low-pass filter (15) connected with the joint of the output terminal of the first voltage/current converter (12) and the output terminal of the second voltage/current converter (14); an amplifier (16) for amplifying the differential voltage between the voltage at the joint and the reference voltage; a PWM modulator (18) performing PWM modulation of the output voltage from the amplifier (16); and a section (19) for driving a load (200), in accordance with the output signal from the PWM modulator (18). COPYRIGHT: (C)2008,JPO&INPIT