Patent ID: 7714562
Filing Date: 2010-05-11
Classification: H02M

Abstract:
1. A switching regulator circuit comprising: a high-side switch and a low-side switch coupled in a series configuration; an inductor having a first terminal coupled to a common terminal between said high-side switch and said low-side switch; and a second terminal coupled to an output terminal of said switching regulator circuit; a low-pass filter coupled to said first terminal of said inductor, said low-pass filter generating a ramp signal based on the voltage signal present at said first terminal of said inductor; a buffer having an input terminal coupled to an output terminal of said low-pass filter, and said buffer circuit isolates said low-pass filter from said output terminal of said switching regulator circuit; and a hysteretic comparator coupled to said low pass filter via said buffer circuit, said hysteretic comparator receiving said ramp signal as an input signal, and generating an output signal which controls the operation of said high-side switch and said low-side switch; and a damping circuit having an input terminal coupled to an output terminal of said buffer circuit and an output terminal coupled to an input terminal of said hysteretic comparator, said damping circuit sampling an output voltage at said output terminal of the switching regulator circuit and adjusting the level of said ramp signal input into said hysteretic comparator said damping circuit comprising: a resistor coupled between an output of the buffer circuit and an input of the hysteristic comparator; and a resistor network coupled to said output terminal of switching regulator circuit, said resistor network configured as a voltage divider so as to feedback a reduced value of the output voltage to the input of said hysteretic comparator.