Error amplification circuit, control method for error amplification circuit, and switching regulator employing error amplification circuit

摘要

An error amplification circuit includes an integrated circuit and a phase compensation capacitor. The integrated circuit includes an error amplifier to amplify a difference between a predetermined reference voltage and an input feedback voltage for output; a current generator circuit to generate a bias current for supply to the error amplifier; a phase compensation resistor; a bias-current control terminal; and a phase compensation terminal connected to an output terminal of the error amplifier via the phase compensation resistor. The phase compensation capacitor is connected to the phase compensation terminal, the phase compensation capacitor being provided outside the integrated circuit.

主权项

1. An error amplification circuit comprising:
an integrated circuit comprising:
an error amplifier, having an output terminal, to amplify a difference between a predetermined reference voltage and an input feedback voltage for output;a current generator circuit to generate a bias current for supply to the error amplifier;a phase compensation resistor,connected to the output terminal of the error amplifier;a bias-current control terminal connected to the current generator circuit; anda phase compensation terminal connected to the output terminal of the error amplifier via the phase compensation resistor; a phase compensation capacitor connected to the phase compensation terminal, the phase compensation capacitor being provided outside the integrated circuit; and a bias-current control resistor electrically connectable to the bias-current control terminal, wherein the current generator circuit generates a first non-zero bias current when the bias-current control terminal is opened, and the current generator circuit generates a second bias current differing from the first bias current when the bias-current control terminal is connected to the bias-current control resistor.