Automatic dropout prevention in LED drivers
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United States of America Patent
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Mar 12, 2013
Grant Date -
Apr 5, 2012
app pub date -
Oct 5, 2010
filing date -
Oct 5, 2010
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A system and method is provided for preventing a dropout of an LED current. In one embodiment of the present invention, the system includes a voltage source, a first circuit, a second circuit, a controller, and at least one LED. The first circuit receives a reference voltage from the voltage source, receives set-point current data from the controller, and uses the reference voltage and the set-point current data to produce a threshold voltage. The threshold voltage is then provided to the second circuit, where it is converted into an output current, which is drawn through the LED. The second circuit then compares the threshold voltage to an output voltage corresponding to the output current, and provides an output to the controller. The controller then uses the output to determine whether a dropout has occurred. If a dropout has occurred, then second set-point current data is provided to the first circuit.
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