| 摘要 |
PURPOSE:To realize a motor driver having a structure capable of performing lock detection and automatic return function in spite of using a small-capacity capacitor. CONSTITUTION:The title motor driver has a capacitor 620 of a capacity smaller than before, a charge/discharge circuit (63, 65 and SW2) which repeats the charge and discharge of the capacitor 620 so as to have voltage lower than a threshold value at the rotating time of a motor and to reach the threshold value at the stop time of the motor, and a counter circuit (670 and 680) for measuring the passage of a specified waiting time t1 required for confirming a motor stop, by counting the reaching to the threshold value a plurality of times in this charge/discharge circuit. And at the stop time of the motor, a pulse signal for returning the motor rotation is generated after the passage of the specified waiting time. |
