LED dimming control circuit
AssigneeGlobal Mixed-mode Technology Inc.
InventorsShang-Yu Chang Chien, Tien-Tzu Chen
Life of this patent
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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.
Claims12
A dimming control circuit used to drive a LED comprising:
- an inductor, wherein a first current flows through the inductor;
- a transistor, wherein the inductor and the transistor are coupled to a node;
- a dimming control signal;
- a feedback signal;
- a switching control circuit, wherein the switching control circuit is controlled by the dimming control signal and the feedback signal, and the transistor is controlled by the switching control circuit;
- an error amplifier comprising a first non-inverted input terminal, a first inverted input terminal, and a first output terminal;
- and
- an inverted amplifier comprising a second input terminal and a second output terminal, wherein:
- the first output terminal and the first non-inverted input terminal form a negative feedback path via the inverted amplifier.
Dependencies are inferred from the claim text.