| 摘要 |
PURPOSE:To obtain the PWM driving circuit of simple constitution which generates small distortion. CONSTITUTION:This circuit is equipped with a saw-tooth wave generating circuit 3 which compares the level of an input signal VIN with the level of a reference voltage VR and generates a saw-tooh wave signal WSAW with a necessary polarity, a comparator 1 which compares the level of the input signal VIN with the level the saw-tooth wave signal WSAW generated by the saw-tooth wave generating circuit 3 and generates a PWM signal with a necessary polarity, and a PWM logic circuit means 4 which determines the driving direction of a load 5 on the basis of the comparison result POL and the generated PWM signal with the necessary polarity. |
