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http://dx.doi.org/10.5573/ieek.2013.50.8.128

Design of the Power-LED Driver for High Speed Dimming Control  

Lee, Keon (Dept. of Electronic Engineering, Inha University)
Kang, Woo-Seong (Dept. of Electronic Engineering, Inha University)
Jung, Tae-Jin (Dept. of Electronic Engineering, Inha University)
Yoon, Kwang-Sub (Dept. of Electronic Engineering, Inha University)
Publication Information
Journal of the Institute of Electronics and Information Engineers / v.50, no.8, 2013 , pp. 128-135 More about this Journal
Abstract
This paper presents a high dimming ratio Power-LED driver IC with high power which is capable of controlling LEDs. In order to accomplish a high dimming ratio LED driver, the preloading inductor current methodology is proposed for the power stage of the proposed method to achieve the fast transient response time during the Power-LED load switching. The information containing the current flowing on the LEDs can be utilized to predict the amount of the current on the inductor. The minimum LED current rising time of existing high dimming ratio Power-LED driver is limited by $3{\mu}s$, however that of the proposed high dimming ratio Power-LED driver is reduced about 1/10. The LED driver is implemented with 0.35um 60V BCDMOS 2-poly 4-metal process. The measurement results show that the proposed LED driver system features the minimum rising time as small as 240ns at the dimming frequency of 1KHz with a 12V of input voltage, nine white LEDs and 353mA of LED current. The LED rising time and power conversion efficiency of the chip are measured to be 240ns and 93.72%, respectively.
Keywords
LED driver; Power-LED; high dimming ratio; high speed dimming; SMPS;
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1 K. Lee, D.-H. Lee, S.-H. Yang, J.-H. Park, K.-S. Yoon, "Design of High Dimming Ratio Power-LED Driver with Preloading inductor current methodology," SoC Design Conference(ISOCC), 2012 International, pp.432-435, 5-6 Nov. 2012.
2 S.-I. Hong, J.-W. Han, D.-H. Kim and O.-K. Kwon, "A double-loop control LED backlight driver IC for medium-sized LCDs," ISSCC Dig. Tech. Papers, 2010, pp. 116-117.
3 Y.-T. Hsieh, B.-D. Liu, J.-F. Wu, C.-L. Fang, H.-H. Tsai, Y.-Z. Juang, "A High- Dimming- Ratio LED Driver for LCD Backlights," Power Electronics, IEEE Transactions on , vol.27, no.11, pp.4562-4570, Nov. 2012.   DOI   ScienceOn
4 Luchen Yu iconManInfo, Yuan Zhu, Minjie Chen, T.Yoshihara "High efficiency multi-channel LED driver based on SIMO switch-mode converter" 대한전자공학회 ISOCC pp. 661-664, Nov, 2012.
5 이동건(Dong-Keon Lee) iconManInfo, 이성철 (Sung-Chul Lee) iconManInfo, 정항근 (Hang-Geun Jeong) iconManInfo "Design of Switch for Improved Efficiency of LED Driver" 대한전자공학회 SoC 학술대회 pp73-75 April. 2011.
6 G. Sauerlander, D. Hente, H. Radermacher, E. Waffenschmidt, J. Jacobs, "Driver Electronics for LEDs," Industry Applications Conference, 2006. 41st IAS Annual Meeting. Conference Record of the 2006 IEEE , vol.5, no., pp.2621-2626, 8-12 Oct. 2006.
7 Y. Yuan, S. Zhenghua, G. Yong, "Design of High-Power White LED Drive Chip with Fully Integrated PWM Dimming Function," Photonics and Optoelectronic (SOPO), 2010 Symposium on, vol., no., pp.1-4, 19-21 June 2010.