Abstract
Owing to the fact that the LED drive circuit must have constant output current control, we propose a controlled current driver with a high precision for the white light LED. Three discrete constant current settings are available and may be selected at the supply voltage from 2.9 V to 4.4 V, which is up to 1 A. An autozero transconductance amplifier is proposed, which effectively improves the precision, reduces the offset voltage and the noise. The variation in the ratio of the external resistor current to the LED load current is less than 2.3%, when the LED load current changes from 200 mA to 800 mA.
Article PDF
Similar content being viewed by others
Avoid common mistakes on your manuscript.
References
PIAO Yan, WANG Rui-guang, and DING Tie-fu. Journal of Optoelectronics · Laser, 19 (2008), 125 (in Chinese)
ZHAO Huan, XU Wen-hai, and LU Yong-jun, Journal of Optoelectronics · Laser, 18 (2007), 1314 (in Chinese)
WANG Hui, WANG Song-lin, and LAI Xia-quan, Journal of Xi’an University, 35 (2008), 272 (in Chinese)
WANG Hongyi, WANG Songlin, and LAI Xinquan, Microeletronics, 35 (2003), 415.
C. Enz, and G. Temes, Proceedings of the IEEE, 1996.
Danchiv, M. Bodea, and C. Dan, International Semiconductor Conference, 2 (2006), 409.
Razavi B. Design of analog CMOS integrated Circuit. Translated by Chen Guican, Cheg Jun, and Zhang Ruizhi, Xi’an Jiaotong University Press, 2003.
Author information
Authors and Affiliations
Corresponding author
Additional information
This work has been supported by the National Natural Science Foundation of China(No. 60876023)
Rights and permissions
About this article
Cite this article
Li, Xr., Wang, Sl., Lai, Xq. et al. Design and implement of LED drive circuit chip with the controllable constant output current. Optoelectron. Lett. 5, 186–189 (2009). https://doi.org/10.1007/s11801-009-8188-6
Received:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11801-009-8188-6