一种基于电流控制模式的白光LED驱动芯片的设计  

Design of White-LED driver based on current controlled mode

作　　者：洪毅[1] 邹雪城[1] 李高[1] 杨寒冰[1] 

机构地区：[1]华中科技大学电子科学与技术系,湖北武汉430074

出　　处：《电子技术应用》2008年第7期62-64,共3页Application of Electronic Technique

摘　　要：设计了一款基于2μm bipolar工艺、应用于彩色LCD背光照明的白光LED驱动芯片。采用PFM控制模式、低反馈电阻及负载电流反馈技术实现芯片驱动的低功耗和恒流输出。系统仿真结果表明,负载电流为20mA时,输出电压纹波系数为0.013%/V,输出电流纹波系数为0.02mA/V,效率为80.1%;芯片版图面积为0.67mm×1.28mm。This paper proposes a white light LED driver based on 2μm bipolar process which is applied in color LCD backlighting. The low consumption and invariable current are realized using PFM mode, low feedback resistor and load current feedback. System simulation demonstrates that when load current is 20mA, the output voltage ripple down to 0.013%/V, current ripple 0.02mA and the efficiency is 80.1%; the chip area is0.67mm×1.28mm.

关 键 词：PFM控制 低反馈电阻 升压 开关电源 

分 类 号：TN624[电子电信—电路与系统] TP368.1[自动化与计算机技术—计算机系统结构]