Patent ID: 7522398
Filing Date: 2009-04-21
Classification: H02M

Abstract:
1. A controller to provide overcurrent protection for a switched-mode power converter, comprising: circuitry for detecting a current in the power converter exceeding a current limit during substantially a minimum on time of a power switch; circuitry, coupled to the circuitry for detecting the current in the power converter for providing a count N of the number of consecutive times that the current in the power converter exceeds the current limit during substantially the minimum on time of the power switch; and circuitry, coupled to the circuitry for providing the count N, for inhibiting conduction of the power switch in the switched-mode power converter for a number of cycles that is a function of the count N, wherein the function is an increasing function of the count N, wherein the count N is also a count of the number of consecutive times that the circuitry for inhibiting conduction is enabled.