Patent ID: 7176668
Filing Date: 2007-02-13
Classification: H02M

Abstract:
1. A switching regulator circuit for providing a regulated voltage to a load, comprising: a power source; a switch circuit configured to control supply of power from the power source to the load; a feedback circuit for generating a feedback signal indicative of the regulated voltage; a timing signal generator for generating a timing signal; a ramp signal generator for generating a ramp signal; a sensed signal circuit for generating a sensed signal indicative of the current supplied by the power source; a current source controlled by the ramp signal for generating a compensation signal indicative of the ramp signal; and a control circuit, coupled to the current source, the timing signal generator, the feedback circuit and the sensed signal circuit, for generating a control signal based on the timing signal, the compensation signal, the sensed signal and the feedback signal, to control the switching of the switch circuit, wherein the power source and the load are coupled to a common terminal, the control circuit subtracts the compensation signal from a signal varying with the difference between a reference signal and the feedback signal, and the compensation signal couples to the signal varying with the difference between the feedback signal and the reference signal via a loop filter comprising a capacitor and a resistor, wherein the resistor couples to the common terminal via a DC voltage source.