Patent ID: 8351227

Claim:
A switching controller for a power converter, comprising: a current-sense circuit, receiving a high-voltage signal across a first switch to generate a current-sense signal, wherein said current-sense signal is representative of a switching current flowing through said first switch; a first comparator, receiving a current-limit threshold and said current-sense signal for generating a first signal when said current-sense signal exceeding said current-limit threshold, wherein said current-limit threshold is utilized to limit a maximum of said switching current flowing through said first switch; a second comparator, receiving a feedback signal and said current-sense signal, wherein said second comparator generates a second signal when said current-sense signal exceeds said feedback signal, wherein said feedback signal is correlated to an output voltage of said power converter; a PWM circuit, coupled to said first comparator and said second comparator for generating a switching signal in response to said first signal and said second signal; and a delay circuit, receiving said switching signal to generate a delayed switching signal, wherein said switching signal generated by said PWM circuit drives a control terminal of said first switch.