US Patent 10952300 LED driver and controller thereof, and LED lighting device

Disclosed an LED driving controller and a driving circuit. The LED driving controller comprises: a power transistor having a control terminal for receiving a switching control signal, a first terminal and a second terminal; zero-crossing detection circuit for generating a zero-crossing detection signal; a first comparison circuit, configured to compare a reference voltage with a sampling voltage to generate a first control signal; a control circuit being coupled to the zero-crossing detection circuit and the comparison circuit and configured to generate a switching control signal in accordance with the zero-crossing detection signal and the first control signal; an overvoltage protection circuit configured to generate an overvoltage protection signal in accordance with an off-time provided by the control circuit and a reference voltage; a shielding circuit configured to shield the overvoltage protection signal is provided.