Patent ID: 8513935
Filing Date: 2013-08-20
Classification: H02M

Abstract:
1. A controller for a switching power converter, comprising: a main switch operably coupled between an input voltage and an output signal and configured for switching responsive to a switch control signal and supply a switch current; a replica switch operably coupled to the input voltage and configured for switching responsive to the switch control signal to supply a replica current proportional to the switch current; a voltage generator configured for generating a replica voltage proportional to the replica current; an overload comparator configured for comparing the replica voltage to an overload reference voltage to generate an overload signal; a ramp generator configured to develop a frequency compensation for a feedback loop of the switching power converter by adjusting a voltage ramp of a ramp modulation signal responsive to the replica current; and a timing controller configured for generating the switch control signal responsive to the ramp modulation signal and modify timing of the switch control signal responsive to the overload signal.