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A high-efficient WLED driver using light-balanced-controlled techniques with current-locked loops

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Abstract

The proposed high-efficient WLED driver using light-balanced-controlled techniques with current-locked loops is presented in this paper. This LED driver has 500:1 current sensing ratio and 1 kHz PWM dimming frequency. The maximum output current of the buck converter is 100 mA and the output voltage range is from 3.5 to 4.8 V with a 20 and 18 μH off-chip capacitor and inductor, respectively. The maximum efficiency of the proposed LED driver is 87.8 % and the current difference between each LED string is 1.33 %. And it is fabricated with TSMC 0.35 μm 2P4 M CMOS processes. The chip area is 1.52 mm × 1.36 mm.

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Acknowledgments

The authors would like to thank National Science Council for project supporting and Chip Implementation Center for chip fabrication. This work was sponsored by NSC 99-2221-E-027-109.

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Authors and Affiliations

  1. Department of Electronic Engineering, National Taipei University of Technology, Taipei, 106, Taiwan

    Jiann-Jong Chen, Bo-Han Hwang, Yao-Ren Guo, Yuh-Shyan Hwang & Cheng-Chieh Yu

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  1. Jiann-Jong Chen
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  2. Bo-Han Hwang
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  3. Yao-Ren Guo
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  5. Cheng-Chieh Yu
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Correspondence to Jiann-Jong Chen.

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Chen, JJ., Hwang, BH., Guo, YR. et al. A high-efficient WLED driver using light-balanced-controlled techniques with current-locked loops. Analog Integr Circ Sig Process 72, 363–373 (2012). https://doi.org/10.1007/s10470-012-9886-8

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  • DOI: https://doi.org/10.1007/s10470-012-9886-8

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