新型高精度高效率LED照明驱动电路的实现  

A Novel High-Precision and High-Efficiency LED Driver Circuit

作　　者：沈小虎[1] 姜岩峰[1] 

机构地区：[1]北方工业大学信息工程学院,北京100144

出　　处：《微电子学》2011年第6期834-839,共6页Microelectronics

基　　金：国家自然科学基金面上项目(60876078);教育部新世纪优秀人才计划(2008)资助项目

摘　　要：提出并设计了一种高精度、高效率LED照明驱动电路。采用平均电流控制模式代替峰值电流的控制模式;同时,采用低阶低侧的Buck拓扑结构,使输出驱动电流的精度误差控制在1%之内。整体电路的转换效率最高可达96%以上,输出驱动电流为350mA,可驱动8个1 W的HBLED灯。该设计基于CSMC 0.5μm 40VBCD工艺,版图尺寸约为1.4mm×1.4mm。通过流片验证了设计的可行性。A high-precision and high-efficiency LED driver IC was designed,in which average current control mode was adopted to replace peak current control mode.Lower-order and low-side buck topology were used to control output driving current error within 1%.The circuit had an overall conversion efficiency up to 96%,and above.It could drive up to eight 1-W HB LED lights with 350 mA constant current.Based on CSMC＇s 0.5 μm 40 V BCD process,the device occupied a layout area of 1.4 mm×1.4 mm.Test results validated the design.

关 键 词：平均电流控制模式 LED 驱动电路 感测电阻 BUCK变换器 

分 类 号：TN722.3[电子电信—电路与系统]