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A fast transient LED driver with adaptive frequency control according to load variation for large-sized LCD backlights

Title
A fast transient LED driver with adaptive frequency control according to load variation for large-sized LCD backlights
Author
권오경
Keywords
dimming data; fast transient DC-DC converter; LCD backlight; LED driver; recovery time; voltage fluctuation
Issue Date
2017-12
Publisher
WILEY
Citation
JOURNAL OF THE SOCIETY FOR INFORMATION DISPLAY, v. 25, no. 12, page. 712-724
Abstract
A fast transient light-emitting diode (LED) driver is proposed for large-sized liquid crystal display TV backlights in attempt to shorten the recovery time and to reduce the voltage fluctuation, while maintaining a high power efficiency. The direct current-direct current (DC-DC) converter in the proposed LED driver accurately detects the load variation using the dimming data and then adjusts the slew rate and operating frequency according to the detected load variation. Thus, it rapidly controls the turn-on time of the power switch and then controls the inductor current so that the output of the proposed LED driver can be accurately regulated during the load transient time. To verify the performance of the proposed LED driver, a DC-DC converter and an expandable LED current controller were fabricated using a 0.35-m bipolar-complementary metal-oxide-semiconductor (CMOS)-double-diffused metal-oxide-semiconductor (DMOS) process technology and assembled with 48 LED channels for measurement. The measurement results show that the proposed LED driver improves the recovery time and voltage fluctuation by 45.1% and 45.6%, respectively. In addition, it achieves a maximum power of 115.2W and a maximum power efficiency of 89.2%. Therefore, the proposed LED driver is suitable for high-end applications such as large-sized LED TV backlight modules.
URI
https://onlinelibrary.wiley.com/doi/abs/10.1002/jsid.619http://repository.hanyang.ac.kr/handle/20.500.11754/116686
ISSN
1071-0922; 1938-3657
DOI
10.1002/jsid.619
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ELECTRONIC ENGINEERING(융합전자공학부) > Articles
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