A High Efficiency Step-Up WLED Driver with Wide Range PWM Dimming

Abstract:

Article Preview

A high efficiency step-up White Light Emitting-diode (WLED) driver with PWM dimming is presented in this paper. An integrated current sensing technique is used to improve system efficiency. Meanwhile, a novel PWM(pulse width modulation) dimming scheme is proposed to achieve wide range dimming frequency, which can be adaptive to dimming frequency from 200Hz to 200 KHz. The proposed driver is designed with CSMC 0.5um 40V bipolar-CMOS-DMOS process. Simulation results verify the functionality of the design and high efficiency is realized, with a peak value of 94.12% at 5.5V-input and 200mA-load.

Info:

Periodical:

Advanced Materials Research (Volumes 588-589)

Edited by:

Lawrence Lim

Pages:

884-887

Citation:

F. Xu and L. N. He, "A High Efficiency Step-Up WLED Driver with Wide Range PWM Dimming", Advanced Materials Research, Vols. 588-589, pp. 884-887, 2012

Online since:

November 2012

Authors:

Export:

Price:

$38.00

[1] Russell D. Dupuis, Michael R. Krames: History, Development, and Applications of High-Brightness Visible Light-Emitting Diodes. IEEE Journal of Display Technology, vol. 26 (2005), p.1154.

DOI: https://doi.org/10.1109/jlt.2008.923628

[2] P. Baureis: Compact modeling of electrical, thermal and optical LED behavior. in Proc. 35th Eur. Solid-State Device Res. Conf., Grenoble, France (2005), p.145.

DOI: https://doi.org/10.1109/essder.2005.1546606

[3] Gacio D., Alonso J.M., Garcia, J. , Campa, L. , Crespo, M.J. , Rico-Secades, M.: PWM Series Dimming for Slow-Dynamics HPF LED Drivers: the High-Frequency Approach. (Transl. Industrial Electronics, 2012).

DOI: https://doi.org/10.1109/tie.2011.2130503

[4] H.P. Forghani-zadeh ,G.A. Rincón-Mora: Current-sensing techniques for DC-DC converters. Midwest Symposium on Circuits and Systems, vol. 2(2002), pp. II-577.

DOI: https://doi.org/10.1109/mwscas.2002.1186927