LED controller
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United States of America Patent
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Aug 11, 2015
Grant Date -
N/A
app pub date -
Jul 7, 2011
filing date -
Jul 7, 2010
priority date (Note) -
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Abstract
Methods and circuits for controlling LEDs are disclosed. In one embodiment, the light emitting diode (LED) integrated circuit controller includes a voltage regulator circuit configured to operate with an alternating current (AC) power source, where the voltage regulator circuit includes a depletion device configured to receive a varying AC voltage and to generate a unregulated voltage, and a band gap voltage reference circuit configured to received the unregulated voltage and to generate a substantially constant direct current (DC) voltage. The LED integrated circuit controller further includes a current setting circuit configured to receive the substantially constant DC voltage and to provide a substantially constant direct current to drive a series of light emitting diodes, and a second depletion device configured to protect the LED integrated circuit controller from external high voltages.
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