Patent ID: 8237640

Claim:
A LED driver circuit, comprising: a LED module, having a first input end and a first output end, said first input end being coupled to an input voltage; a bias circuit, having a second input end and a second output end, said second input end being coupled to said first output end; a first switch, having a first gate terminal, a first channel input terminal and a first channel output terminal, said first gate terminal being coupled to said second output end; an inductor, coupled between said first output end and said first channel input terminal; a regulator, having a third input end and a third output end, said third input end being coupled to said first channel output terminal; a controller, having a supply voltage input terminal, a current sensing input terminal and a pulse output terminal, said supply voltage input terminal being coupled to said third output end; a second switch, having a second gate terminal, a second channel input terminal and a second channel output terminal, said second gate terminal being coupled to said pulse output terminal, said second channel input terminal being coupled to said first channel output terminal, and said second channel output terminal being coupled to said current sensing input terminal; and a current-to-voltage converter, coupled between said second channel output terminal and a reference ground.