Patent ID: 8680835

Claim:
A buck DC-to-DC converter having a novel output protection mechanism, comprising: a buck converter circuit, having a line input end, a DC output end, a first feedback end, and a second feedback end, said line input end being coupled to a line voltage; a voltage divider, having an input terminal and an output terminal, said input terminal being coupled to said DC output end of said buck converter circuit, and said output terminal coupled to said first feedback end of said buck converter circuit for providing a first feedback voltage; and an output current sensing resistor, having one end coupled to said DC output end of said buck converter circuit, and another end coupled to said second feedback end of said buck converter circuit for providing a second feedback voltage; wherein said buck converter circuit uses said first feedback voltage for regulating a DC output voltage at said DC output end of said buck converter circuit, and uses said first feedback voltage and said second feedback voltage to generate a protection signal for said buck converter circuit when the current flowing through said output current sensing resistor exceeds a predetermined value.