大功率照明白光LED恒流驱动芯片设计  

Design of Constant-current Driver IC for Power White LEDs

作　　者：郑晓东[1] 郭维[1] 朱大中[1] 

机构地区：[1]浙江大学信息与电子工程学系微电子与光电子研究所,杭州310027

出　　处：《固体电子学研究与进展》2009年第1期122-125,共4页Research & Progress of SSE

基　　金：浙江省科学技术厅科技计划项目高效节能技术专项(计划编号2006C11007)

摘　　要：基于0.6μm标准CMOS工艺,研究设计了一款大功率照明白光LED恒流驱动芯片,可为两路功率型LED分别提供恒定的350mA驱动电流。驱动电路的输出级大功率管采用蛇形栅结构的设计,在标准CMOS工艺线上实现了功率器件与控制电路的单片集成。采用单电源供电,最高输出功率可达3W以上;单电源电压在4～7V范围内,芯片能够实现良好的恒流驱动功能,驱动电流恒流失配度保持在3.09%以内;当标准5V电源有10%的变化时,驱动电流的变化可控制在1.42%之内,恒流失配度保持在2.84%以内;而当环境温度在10～90℃范围内变化,驱动电流最多增大1.75%,恒流失配度保持在3.15%以内。采用双电源供电时,芯片电源转换效率可达83%。A monolithic constant-current driving integrated circuit （IC） is designed and fabricated by using CSMC 0.6um standard CMOS process to drive two power white light-emitting diode （LED） strings with 350 mA each. The output-stage power MOSFETs are designed with CMOS bent-gate structure, and it makes possible the compatible integration of power device with conventional CMOS signal processing circuits. In the typical operating circuit with single power supply, it is able to supply 3W power white LED, and the input voltage range is 4 V to 7 V. When 5 V single voltage supply changes by 10% or ambient temperature varies from 10℃ to 90℃, the variance of the driving current can be controlled within 1.42% and 1.75%, while the currents of the two paths are mismatched within 2.84% and 3.15% respectively. The power efficiency of this chip can reach up to 83% with double voltage supplies.

关 键 词：互补金属氧化物半导体功率集成电路 功率型白光发光二极管 蛇形栅结构 恒流驱动 

分 类 号：TN432[电子电信—微电子学与固体电子学]