LED driver circuit and method
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United States of America Patent
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-
Dec 28, 2004
Grant Date -
Feb 6, 2003
app pub date -
Oct 31, 2001
filing date -
Dec 23, 1999
priority date (Note) -
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Abstract
An LED driver circuit and method are disclosed where a plurality of arrays of light emitting diodes each have a transistor connected to each respective array of light emitting diodes. A PWM controller has an input for receiving a voltage reference and an output connected to selected transistors for driving the selected transistors and setting a PWM duty cycle for the selected arrays of light emitting diodes to determine the brightness of selected light emitting diodes. An oscillator is connected to the PWM controller for driving the PWM controller.
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