Dimming LED circuit augmenting DC/DC controller integrated circuit

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United States of America Patent

PATENT NO 10959306
APP PUB NO 20180035500A1
SERIAL NO

15606388

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Abstract

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Embodiments include systems, methods, and apparatuses for providing a dimming function in a single stage AC input light emitting diode (LED) driver with a controller that contains an on-chip error amplifier and an on-chip fixed reference voltage source coupled to a first input of the error amplifier. The controller controls a duty cycle of a switching transistor to cause a feedback voltage, applied to a first package input terminal, to match the reference voltage. To achieve a dimming function, a voltage across a current sense resistor in series with the LEDs is applied to a first input of a high gain differential amplifier, and a variable dimming control voltage is applied to a second input of the differential amplifier. The output of the differential amplifier is coupled to the first package input terminal. The differential amplifier input signals will be matched at the target LED current level.

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Patent Owner(s)

Patent OwnerAddress
LUMILEDS LLC370 WEST TRIMBLE ROAD SAN JOSE CA 95131

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Bonne, Ron San Jose, US 3 23
Qiu, Yifeng San Jose, US 69 363
Soer, Wouter San Jose, US 32 64
Song, Zhihua San Jose, US 14 37

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