Patent ID: 6369555
Filing Date: 2002-04-09
Classification: H02M

Abstract:
A hysteretic dc-dc converter circuit, comprising:a drive circuit; an LC filter circuit coupled to the drive circuit, wherein the LC filter has a converter circuit output terminal associated therewith; a hysteretic comparator circuit having an output coupled to the drive circuit, wherein a first input terminal of the hysteretic comparator circuit is coupled to the output terminal of the converter circuit; and a feedback circuit coupled between the input of the drive circuit and a second input terminal of the hysteretic comparator circuit, wherein the converter circuit input is also coupled to the second input terminal of the hysteretic comparator circuit, and wherein the feedback circuit provides a signal that, coupled with an input signal at the converter circuit input, is out of phase with an output signal at the first input terminal, and wherein a comparison of the signals at the first and second input terminals of the hysteretic comparator circuit results in a hysteretic comparator trip frequency which is greater than a trip frequency that would be dictated by a hysteresis window associated with the comparator circuit.