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A dual-loop boost-converter LED driver IC with temperature compensation
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 Title & Authors
A dual-loop boost-converter LED driver IC with temperature compensation
Park, Ji-Hoon; Yoon, Seong-Jin; Hwang, In-Chul;
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 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 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;
 Language
Korean
 Cited by
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