Motor current detecting IC and motor current detector or motor control apparatus using the same

摘要

A motor current detecting IC of the invention includes a comparing circuit having a detection value setting terminal which sets a detection current value, a current signal amplifying circuit having a differential amplifying circuit connected to the comparing circuit, one pair of input terminals connected to the differential amplifying circuit and an output terminal 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 comparing circuit compares a voltage determined by a detection value setting resistor connected to the detection value setting terminal with a voltage input to any one of the pair of input terminals of the differential amplifying circuit or a voltage of the output terminal of the differential amplifying circuit and outputs a comparison result. For this reason, reductions in size and cost of a motor control circuit, a motor control apparatus, and various apparatuses using the motor control apparatuses can be realized.