Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Takashi Fujino0
Date of Patent
September 21, 2010
0Patent Application Number
116858510
Date Filed
March 14, 2007
0Patent Primary Examiner
Patent abstract
An LED drive circuit of the disclosed subject matter can include an LED unit and a serial circuit connected in parallel therewith. The serial circuit includes a resistor and a positive temperature coefficient resistor having a positive linear temperature coefficient. A voltage across the positive temperature coefficient resistor is fed back to an output control circuit. An output voltage that is PWM-controlled on the basis of a reference voltage set at the output control circuit is used to drive the LED unit.
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