Current-restriction circuit and driving method therefor

A method of driving a current-restriction circuit,

• the current-restriction circuit comprising:
• an input terminal to which an input voltage is input;
• an output terminal from which an output voltage is output;
• a driver transistor including a first end connected to the input terminal, a second end connected to the output terminal, and a control terminal;
• a sense transistor including a first end connected to the input terminal via a sense resistor, a second end connected to the output terminal, and a control terminal connected to the control terminal of the driver transistor;
• and
• a first operational amplifier circuit to which both a bias voltage with reference to an electrical potential at the input terminal and a decrease in a voltage at the sense resistor are input, having an output terminal connected to the control terminals of the driver transistor and the sense transistor,
• the method comprising:
• keeping the bias voltage below a predetermined bias voltage according to a voltage difference between the input voltage and the output voltage.