LED controller
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United States of America Patent
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Feb 27, 2018
Issued Date -
N/A
app pub date -
Aug 10, 2015
filing date -
Jul 7, 2010
priority date (Note) -
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Abstract
Methods and circuits for controlling LEDs are disclosed. In one embodiment, a multistage driver for driving a plurality of serially connected LEDs includes a voltage regulator circuit configured to receive a rectified AC voltage, where the voltage regulator circuit includes a depletion device configured to generate a unregulated voltage using the rectified AC voltage, a band gap voltage reference circuit configured to generate a plurality of reference voltages using the unregulated voltage, and a current setting circuit configured to control the plurality of serially connected LEDs using the plurality of reference voltages.
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