Patent ID: 7253593
Filing Date: 2007-08-07
Classification: H02M

Abstract:
1. An error amplifier comprising: an operational transconductance amplifier, generating a first current according to the voltage difference between a reference voltage and a feedback voltage; a compensation circuit, comprising a compensation resistor, a compensation capacitor, and a Miller circuit operated in a first mode or a second mode, wherein the first terminal of the compensation resistor is coupled to the output terminal of the operational transconductance amplifier, the first and second terminals of the Miller circuit are respectively coupled to the second terminal of the compensation resistor and the first terminal of the compensation capacitor, the capacitance of the compensation capacitor charged or discharged by a second current is C a fast transient controller, switching the Miller circuit to the second mode when the feedback voltage exceeds a high voltage level or is below a low voltage level, otherwise the Miller circuit is set in the first mode.