电子器件2013，Vol.36Issue(4)：465-468,4.DOI:10.3969/j.issn.1005-9490.2013.04.008
带补偿网络的高精度LED恒流驱动电路的设计
Design of High Precision Constant Current LED Driver Circuit with Compensation Network
洪静 1王卫东1
作者信息
- 1. 桂林电子科技大学信息与通信学院,广西桂林541004
- 折叠
摘要
Abstract
In order to meet the requirements of LED display driver chip,a constant current LED driver circuit is designed by using CSMC 0.5 μm CMOS digital-analog mixed process.The circuit uses compensation network and high precision current mirror to improve transient response and inhance the accuracy of output current.It can uses external resistor to control the output current,the range of current is 3 mA to 40 mA.Simulated by Spectre with different corners,when the supply voltage changes from 4.5 V to 5.5 V,the maximum rate of current change is 1.62％ ;when the temperature changes from-40 ℃ to 85 ℃,the maximum temperature coefficient of output current is 58.84 × 10-6; external voltage varies from 2V to 6V,the maximum rate of current change is 2.23％,the performance of the driver circuit is fine.关键词
恒流驱动/带隙基准/补偿网络/高精度电流镜Key words
constant current drive/bandgap/compensation network/high precision current mirror分类
信息技术与安全科学引用本文复制引用
洪静,王卫东..带补偿网络的高精度LED恒流驱动电路的设计[J].电子器件,2013,36(4):465-468,4.
