LED drive circuit
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United States of America Patent
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Sep 21, 2010
Issued Date -
N/A
app pub date -
Mar 14, 2007
filing date -
Mar 20, 2006
priority date (Note) -
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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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