| 摘要 |
A current sensing circuit includes; a shunt resistor, on which a motor current is flown; a reference resistor which has a resistance value that is n times the shunt resistor; and a current following circuit. The current following circuit includes: a following current control circuit, which controls the following current and generates a first reference voltage; and a capacitor which generates a second reference voltage indicating an average value of the first reference voltage. A first comparator compares a third reference voltage higher than the first reference voltage with the second reference voltage, and outputs the current limitation control signal. A motor current sensing range expanding circuit expands a motor current sensing range by increasing a ratio of the current sensing circuit having the shunt resistor and the reference resistor.
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