COIL LOAD DRIVING CIRCUIT AND OPTICAL DISC DEVICE

摘要

A coil load driving circuit capable of suppressing occurrence of radiant noise when a motor is at rest. The coil load driving circuit (1) comprises output buffers (11,12) for outputting PWM pulses to the two terminals of a motor (5); a transfer voltage generating circuit (17) for outputting transfer voltages (VTR1,VTR2) proportional to the difference between an input control voltage (VIN) and an input reference voltage (VREF); PWM comparators (14,15) for outputting PWM signals (PW1,PW2) corresponding to the transfer voltages (VTR1,VTR2); and an output PWM pulse combining circuit (16) for controlling the output buffer (11) by use of the AND signal between the PWM signal (PW1) and the exclusive-OR signal (EX) between the PWM signals (PW1,PW2) and for controlling the output buffer (12) by use of the AND signal between the PWM signal (PW2) and the exclusive-OR signal (EX).