Semiconductor circuit and semiconductor apparatus

摘要

A semiconductor circuit includes an operational amplifier, a voltage drop circuit, and a switch. The operational amplifier has an output terminal connected to an active element that produces a load drive current. A reference voltage is input to the non-inverting input of the operational amplifier. The voltage drop circuit drops a voltage outputted from the operational amplifier. The switch applies a voltage corresponding to a predetermined current flowing when the active element is on to the inverting input of the operational amplifier in a first interval in which the active element is on in response to a predetermined voltage from the operational amplifier. The switch allows the voltage dropped by the voltage drop circuit to be input to the inverting input in a second interval in which the active element is off, thereby shortening a time period until the load drive current starts to flow.

主权项

1. A semiconductor circuit that controls driving of a first load, the semiconductor circuit comprising:
an operational amplifier that includes a first input terminal, a second input terminal, and an output terminal, and that outputs a first voltage from the output terminal; a voltage drop circuit which drops the first voltage and generates a second voltage; and an input switching part configured to input a third voltage to the second input terminal during a first interval in which an active element is turned on by the first voltage, and to input the second voltage to the second input terminal during a second interval in which the active element is turned off.