Control circuit having adaptive blanking time and method for providing the same

A control circuit, comprising:

• a) a blanking time control circuit configured to generate a blanking control signal according to a peak current of a main switch of a power stage circuit of a flyback converter, wherein said power stage circuit comprises a transformer having primary and secondary windings, said main switch coupled to said primary winding, and a rectifying device coupled to said secondary winding;
• b) a sampling time control circuit configured to generate a sampling time control signal according to said blanking control signal and a feedback voltage signal;
• and
• c) a voltage detection circuit configured to receive said feedback voltage signal and said sampling time control signal, and to determine the sampling time of detecting said feedback voltage signal according to said sampling time control signal in order to obtain a detection signal that represents an output voltage signal of said flyback converter for controlling said main switch, wherein said voltage detection circuit does not detect fluctuations in said feedback voltage signal when said blanking control signal is active, and the period during which said blanking control signal is active is adjustable in accordance with said peak current.