Patent ID: 8941367
Filing Date: 2015-01-27
Classification: G05F,H02M

Abstract:
1. A switching regulator, comprising: a power stage having a first power switch and a second power switch coupled in series to receive an input voltage; a filter circuit having an inductor and an output capacitor, an output signal is provided across the output capacitor; a feedback circuit having an input terminal configured to receive the output voltage, and an output terminal configured to provide a feedback signal indicating the output voltage based on the output voltage; and a control circuit configured to provide a switching signal to control the ON and OFF of the first power switch so as to regulate the energy supplied to a load based on a current flowing through the first power switch and the feedback signal; wherein the control circuit has a peak current generator configured to generate a peak current signal, and wherein a gain of the variation of the peak current signal between contiguous switching cycles is less than one; wherein the peak current generator comprises: a current source; a peak capacitor coupled in parallel to the current source, the peak capacitor having two terminals; a first switch having a control terminal, a first terminal and a second terminal, the control terminal configured to receive a reset signal; an inverter having an input terminal configured to receive the reset signal, and an output terminal configured to provide a reversed reset signal; a second switch having a control terminal coupled to the inverter to receive the reversed reset signal, a first terminal coupled to the first terminal of the peak capacitor, and a second terminal coupled to a first terminal of the first switch; a filter capacitor having a first terminal coupled to the first terminal of the first switch, and a second terminal coupled to a reference ground; and a first voltage source having a first terminal coupled to the second terminal of the first switch, and a second terminal coupled to the reference ground; wherein the filter capacitor is of a same capacitance as the peak capacitor, and the peak current signal is provided across the peak capacitor.