Design and Verification of a High Performance LED Driver with an Efficient Current Sensing Architecture

• 作者: Aixi Zhang Caixia Du Hailang Liang Jin He Lin He Mansun Chan Qingxing He Tsz Yin Man Wing Yan Leung Xiaomeng He
• 来源期刊: 电路与系统(英文)
• 学科: 医学
• 关键词: LED DRIVER Current SENSING CAPACITOR VOLTAGE FEEDBACK Circuit
• 年，卷（期）: 2013,（5）
• 页码范围: 393-400
• 页数: 8页
• 分类号: R73

摘要

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.