| 摘要 |
PROBLEM TO BE SOLVED: To provide a drive unit with improved reliability with respect to heating for a motor. SOLUTION: A drive unit includes two resistors 41 and 42 for dividing a constant voltage VREG, a PNP transistor 45 with a base, to which the divided voltage is input, a constant current circuit 47 for making an emitter current constant in the transistor 25, an NPN transistor 46 with a base connected to emitter of the transistor 45, a resistor 43 connected between the emitter of the transistor 46 and a reference voltage GND, and a resistor 44 connected between the collector of the transistor 46 and a drive voltage VCC of a motor. The collector voltage of the transistor 46 is generated as a current-limiting voltage VCL. |
