| 摘要 |
A motor current detecting IC (101) of the invention includes a current signal amplifying circuit having a differential amplifying circuit (105), one pair of input terminals (T1,T2) connected to the differential amplifying circuit, and an output terminal (T7) connected to an output of the differential amplifying circuit; and a power supply terminal which supplies a power supply voltage to the current signal amplifying circuit. The input terminal has a protecting unit (115) for allowing input of a negative voltage. In this manner, a reduction in size and a reduction in cost of the current signal amplifying circuit are realized. |
