Circuits and methods for driving light sources
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United States of America Patent
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-
Dec 11, 2012
Grant Date -
Sep 2, 2010
app pub date -
May 19, 2010
filing date -
Dec 12, 2008
priority date (Note) -
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Abstract
A dimming controller for controlling power of a light source has a monitoring terminal, a dimming terminal, and a control terminal. The monitoring terminal is operable for receiving a current monitoring signal indicating a current flowing through the light source. The dimming terminal is operable for receiving a ramp signal. The voltage of the ramp signal increases if a power switch coupled between a power source and the light source is turned on. The control terminal is operable for providing a control signal to control a control switch coupled in series with the light source based on the current monitoring signal and the ramp signal. An average current of the light source increases as the ramp signal increases until the average current reaches a predetermined level.
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