LED dimming control circuit
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United States of America Patent
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Nov 30, 2010
Grant Date -
Jul 30, 2009
app pub date -
Jan 28, 2008
filing date -
Jan 28, 2008
priority date (Note) -
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Abstract
A LED dimming control circuit that avoids a higher output voltage than expected is provided. The LED dimming control circuit comprises an inductor, a transistor, a dimming control signal, a feedback signal, a switching control circuit, an error amplifier, and an inverted amplifier. The inductor and the transistor are coupled to a node. The switching control circuit is controlled by the dimming control signal and the feedback signal. The transistor is controlled by the switching control circuit. The output terminal of the error amplifier and the non-inverted input terminal of the error amplifier form a negative feedback path via the inverted amplifier.
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