A high power buck-boost switch-mode LED driver delivering a constant 350 mA with a power efficient current sensing scheme is presented in this paper. The LED current is extracted by differentiating the output capacitor voltage and maintained by a feedback. The circuit has been fabricated in a standard 0.35 μm AMS CMOS process. Measurement results demonstrated a power-conversion efficiency over 90% with a line regulation of 8%/V for input voltage of 3.3 V and current output between 200 mA and 350 mA.
Cite this paper
J. He, W. Leung, T. Man, L. He, H. Liang, A. Zhang, Q. He, C. Du, X. He and M. Chan, "Design and Verification of a High Performance LED Driver with an Efficient Current Sensing Architecture," Circuits and Systems, Vol. 4 No. 5, 2013, pp. 393-400. doi: 10.4236/cs.2013.45052.
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