High brightness white LED driver with adaptive current control strategy

Xin Liu; Shuxu Guo; Lifang Bian; Dong Qiao; Zhengxuan Wang; Yuchun Chang

doi:10.1117/12.830912

21 May 2009 High brightness white LED driver with adaptive current control strategy

Xin Liu, Shuxu Guo, Lifang Bian, Dong Qiao, Zhengxuan Wang, Yuchun Chang

Proceedings Volume 7282, 4th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing Technologies; 72822E (2009) https://doi.org/10.1117/12.830912
Event: AOMATT 2008 - 4th International Symposium on Advanced Optical Manufacturing, 2008, Chengdu, Chengdu, China

Abstract

A high efficiency and high brightness white LED driver with adaptive current control strategy in 0.5um CMOS process is presented in this paper. The current control mode is determined by output current level and input voltage value, switching between normal low drop-out (LDO) regulator and 2×charge-pump mode. The presented whiter LED driver is able to drive load current as large as 1.1A. The peak efficiency as high as 95% occurs at 220mA load current, with an output voltage ripple lower than 95mV at 1.1A output current can be achieved.

Citation Download Citation

Xin Liu, Shuxu Guo, Lifang Bian, Dong Qiao, Zhengxuan Wang, and Yuchun Chang "High brightness white LED driver with adaptive current control strategy", Proc. SPIE 7282, 4th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing Technologies, 72822E (21 May 2009); https://doi.org/10.1117/12.830912

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