Author(s)

Jin He, Wing Yan Leung, Tsz Yin Man, Lin He, Hailang Liang, Aixi Zhang, Qingxing He, Caixia Du, Xiaomeng He, Mansun Chan

Department of Electrical and Electronic Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, China.
Peking University, Shenzhen SOC Key Laboratory, PKU HKUST Shenzhen Institution, Shenzhen Institute of Peking University, Shenzhen, China.
Peking University, Shenzhen SOC Key Laboratory, PKU HKUST Shenzhen Institution,Shenzhen Institute of Peking University, Shenzhen, China; Shenzhen Huayue Terascale Chip Ltd. Co., Shenzhen, China.
Peking University, Shenzhen SOC Key Laboratory, PKU HKUST Shenzhen Institution,Shenzhen Institute of Peking University, Shenzhen, China;Department of Electrical and Electronic Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, China.
Shenzhen Huayue Terascale Chip Ltd. Co., Shenzhen, China.

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.

LED Driver; Current Sensing; Capacitor Voltage; Feedback; Circuit

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.