Patent ID: 8686706

Claim:
A reference voltage regulating method for a constant current driver, the method comprising: a) setting a reference voltage circuit matching with a current output channel of a constant current source in said constant current driver; b) setting a first resistor of said reference voltage circuit to follow an ideal equivalent resistor of said current output channel, and maintaining a proportion of said first resistor and said ideal equivalent resistor to be no less than a predetermined value M; c) setting a first current of said reference voltage circuit to follow an ideal output current of said current output channel, and maintaining a proportion of said first current and said ideal output current to be no less than 1/M; and d) setting a product of said first current and said first resistor to be a reference voltage of said reference voltage circuit, and setting a product of said ideal output current and said ideal equivalent resistor to be a threshold voltage of said constant current source, wherein said reference voltage is no less than said threshold voltage.