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http://dx.doi.org/10.9723/jksiis.2015.20.6.029

A dual-loop boost-converter LED driver IC with temperature compensation  

Park, Ji-Hoon (강원대학교 BIT의료융합학과)
Yoon, Seong-Jin (고려대학교 전기전자공학과)
Hwang, In-Chul (강원대학교 전기전자공학과)
Publication Information
Journal of Korea Society of Industrial Information Systems / v.20, no.6, 2015 , pp. 29-36 More about this Journal
Abstract
This paper presents an LED backlight driver IC consisting of three linear current regulators and an output-voltage regulation loop with a self-adjustable reference voltage. In the proposed LED driver, the output voltage is controlled by dual feedback loops. The first loop senses and controls the output voltage, and the second loop senses the voltage drop of the linear current regulator and adjusts the reference voltage. With these feedback loops, the voltage drop of the linear current regulator is maintained at a minimum value, at which the driver efficiency is maximized. The output of the driver is a three-channel LED setup with four LEDs in each channel. The luminance is adjusted by the PWM dimming signal. The proposed driver is designed by a $0.35-{\mu}m$ 60-V high-voltage process, resulting in an experimental maximum efficiency of approximately 85%.
Keywords
Double-loop boost converter; self-adjustable reference voltage; LED driver; lowest-headroom selector; off-time voltage holder;
Citations & Related Records
Times Cited By KSCI : 4  (Citation Analysis)
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