Integrated circuit with constant-voltage control circuit

A voltage control arrangement comprising an integrated circuit having a low withstand voltage and having first, second and third terminals and incorporating a constant-voltage control circuit, and an external current control circuit which receives an input voltage which is higher than the withstand voltage of the integrated circuit and generates a regulated voltage lower than said input voltage in response to a control signal and supplies the regulated voltage to the first terminal of the integrated circuit, said integrated circuit comprising:

• a voltage detection circuit for generating a detection signal whose waveform accords with said regulated voltage of said current control circuit received at the first terminal of the integrated circuit;
• a reference voltage generating circuit for generating a reference voltage signal to determine a target value of said regulated voltage in accordance with an external smoothing circuit, which is connected to said reference voltage generating circuit through the second terminal of the integrated circuit;
• and
• an error amplifying circuit for amplifying a difference between said detection signal and said reference voltage signal, and supplying the difference thus amplified to said external current control circuit as said control signal through the third terminal of the integrated circuit.