Constant current circuit and light emitting diode driving device using the same
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United States of America Patent
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Dec 29, 2015
Grant Date -
Apr 11, 2013
app pub date -
Jun 16, 2011
filing date -
Jun 29, 2010
priority date (Note) -
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Abstract
A constant current circuit includes a first transistor, a second transistor having the gate and the source connected to the gate and the source of the first transistor, and having the drain connected to a load, a voltage adjustment circuit section that controls the drain voltage of the first transistor, a constant current generation circuit section that supplies a constant current to the first transistor, and a detection circuit section that determines whether at least one of the first transistor and the second transistor is unable to output a current proportional to the first constant current while at least one of the first transistor and the second transistor operates in the linear region, by performing a voltage comparison between a voltage at a connecting section between the voltage adjustment circuit section and the constant current generation circuit section and a predetermined reference voltage.
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