Phase compensation circuit, a semiconductor integrated circuit with a phase compensation circuit and a power supply circuit with a phase compensation circuit

摘要

In an energy supply circuit controls a error amplifier (4, 22) a main transistor (t1, t31, t41, t51, t61, t71, t81) based on a detection according to an output voltage and a reference voltage corresponding to a target voltage of the output voltage in such a way that the output voltage corresponds to the target voltage. A phase compensating circuit (5, 24) for the energy supply circuit includes a level shifting circuit (9) and a phase compensation capacitor (c2). The level shifting circuit generates a circuit that is displaced by displacement of a direct voltage component of the output voltage in the direction of a ground potential by a predetermined voltage and releases the offset voltage of an output terminal (n2) of the level shifting circuit from. The phases compensation capacitor is located on a route between the output terminal of said level shifting circuit and an input terminal of an amplifier circuit (4, 23) of the error amplifier.