Low voltage light source driving circuit
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United States of America Patent
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Mar 27, 2012
Issued Date -
N/A
app pub date -
Mar 12, 2009
filing date -
Mar 12, 2009
priority date (Note) -
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Abstract
A low voltage LED (Light Emitting Diode) driving circuit operates under low supply voltage to provide stable and reliable control of LEDs. The LED driving circuit includes a switching transistor to turn on or off an output current in the LED. The LED driving circuit also includes a control transistor for controlling the level of the output current. The two transistors are coupled via a node that is maintained at a low voltage to increase the voltage across the switching transistor. The increased voltage across the switching transistor allows faster switching and more stable control over different levels of output voltage. The LED driver also includes circuit components for matching the turn-on times and turn-off times for different levels of the output current.
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