Circuits and methods for driving light sources
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United States of America Patent
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Nov 18, 2014
Issued Date -
N/A
app pub date -
Aug 19, 2013
filing date -
Mar 4, 2010
priority date (Note) -
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Abstract
A controller for controlling power to a light source includes a first sensing pin, a second sensing pin, and a driving pin. The first sensing pin receives a first signal indicating an instant current through an energy storage element. The second sensing pin receives a second signal indicating whether the instant current decreases to a predetermined level. The driving pin provides a driving signal to a switch to control a current through the light source to a target level. The driving signal is generated based on one or more signals selected from the first signal and the second signal. The controller further includes an error amplifier for generating an error signal based on the first signal and a reference signal indicating the target level. The output of the error amplifier is coupled to a capacitor.
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