TITLE:
Design and Verification of a High Performance LED Driver with an Efficient Current Sensing Architecture
AUTHORS:
Jin He, Wing Yan Leung, Tsz Yin Man, Lin He, Hailang Liang, Aixi Zhang, Qingxing He, Caixia Du, Xiaomeng He, Mansun Chan
KEYWORDS:
LED Driver; Current Sensing; Capacitor Voltage; Feedback; Circuit
JOURNAL NAME:
Circuits and Systems,
Vol.4 No.5,
August
30,
2013
ABSTRACT: 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.