CURRENT-CONTROLLED STAGES, CONSTANT CURRENT CONTROL SYSTEMS, AND CURRENT CONTROL METHODS FOR DRIVING LEDS
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United States of America Patent
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Issued Date -
Feb 14, 2013
app pub date -
Jul 16, 2012
filing date -
Aug 12, 2011
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
Disclosure has current-controlling stages, backlight systems and control methods for driving LEDs. A disclosed current-controlling stage has a current controller and a feedback apparatus. The current controller is coupled to a light-emitting device, for making the driving current through the light-emitting device substantially a predetermined value. The current controller has a control node, at which a control voltage substantially controls the driving current. The feedback apparatus influences a compensation voltage based on the control voltage to keep the control voltage substantially around a first predetermined value. The compensation voltage substantially determines an output power of a voltage-controlling stage.
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