脉宽调制型大功率LED恒流驱动芯片的研究  

Pulse Width Modulated Constant Current Driving IC for 1 W Power LED

作　　者：沈慧[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技术与系统设计研究所,杭州310027

出　　处：《固体电子学研究与进展》2006年第3期359-363,共5页Research & Progress of SSE

基　　金：浙江省教育厅科研项目(编号20051006);浙江大学微电子所-杭州高特联合研发中心科研项目

摘　　要：基于0.6μm5V标准CMOS工艺,研究并设计了一种脉宽调制型大功率照明LED恒流驱动芯片为1W大功率照明LED灯提供350mA恒定的平均驱动电流。实现了在5V电源电压有10%跳变时,平均驱动电流的变化可被控制在4.5%以内。输出级开关MOS管采用高密度的版图结构使单位面积的有效宽长比与普通结构的MOS管相比提高了一倍。芯片的电源效率可达87%,与以前设计的串联饱和型半导体照明LED恒流驱动芯片[1]相比提高近25%。A pulse width modulated（PWM） constant current driving chip is designed based on CSMC 0.6μm 5 V standard CMOS process to supply a 1 W power LED lamp with constant average current of 350 mA in despite of changes in power supply. Test results have shown that the variance of average driving current can be controlled within range of 4.5% when power supply changes by 10%. Effective W/L density of MOS switch in the output stage is doubled compared with normal MOS structure using high W/L density structure. Efficiency of 87% is readily achievable with improvement of nearly 25% compared with the formerly designed DC mode constant current driving chip.

关 键 词：互补金属氧化物半导体集成电路 照明发光二极管 脉宽调制型 恒流驱动 电源效率 

分 类 号：TN432[电子电信—微电子学与固体电子学]