Patent ID: 7576524

Claim:
A constant voltage generating apparatus, comprising: an output circuit controlled in accordance with a control voltage; a voltage detection signal generating circuit adapted to generate a voltage detection signal in accordance with a difference between an output voltage signal of said output circuit and a first reference signal; a current detection signal generating circuit adapted to generate a current detection signal in accordance with a difference between an output current signal of said output circuit and a second reference signal; a control current generating circuit adapted to generate a control current in accordance with said voltage detection signal and said current detection signal; and a control current-to-control voltage converting circuit adapted to convert said control current into said control voltage, wherein said control current generating circuit comprises: a first current mirror circuit adapted to generate a first current in accordance with said voltage detection signal; and a second current mirror circuit adapted to generate a second current in accordance with said current detection signal, said first and second current mirror circuits being combined with each other so that said control current is determined in accordance with a difference between said first and second currents.