US 2013/0278166 A1 · SEMICONDUCTOR CIRCUIT AND SEMICONDUCTOR APPARATUS

Abstract

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.

Claims8

Dependent claims

A semiconductor circuit, in which to control driving of a first load, comprising:

an operational amplifier that includes a first input terminal, a second input terminal, and an output terminal, and 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 which allows a third voltage input to the second input terminal in a first interval in which an active element is turned on by the first voltage, and allows the second voltage to be input to the second input terminal in a second interval in which the active element is turned off.

1 more element

Dependencies are inferred from the claim text.

Semiconductor circuit and semiconductor apparatus

Life of this patent

Semiconductor circuit and semiconductor apparatus

Life of this patent

Abstract

Claims8