| 精密比例采样模式LED驱动电路设计和研究 |
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| 引用本文： | 郭维,杨幸,朱大中.精密比例采样模式LED驱动电路设计和研究[J].半导体学报,2010,31(4):045008-5. |
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| 作者姓名： | 郭维 杨幸 朱大中 |
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| 作者单位： | Department;Information;Science;Electronics;Engineering;Institute;Microelectronics;Optoelectronics;Zhejiang;University; |
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| 基金项目： | 浙江省重大科技专项工业项目高效节能专项：“大功率照明LED驱动集成电路的设计开发”（计划编号2006C11007）； |
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| 摘 要： | 基于CSMC 0.5μm标准CMOS工艺设计研制了一种精密比例采样模式的LED驱动电路，电路通过运算放大器反馈控制使采样MOS管和功率MOS管的三端电位相等，实现采样电流对输出电流的精确传感，达到更好的恒流特性。通过电路的小信号模型分析，得到精密比例采样模式的小信号等效输出电阻远大于传统比例采样模式，同时保证了系统的稳定性。经电路仿真及流片测试，表明当LED驱动电流为350mA,电源电压6V并正负波动10%时，改进的精密比例采样模式LED驱动电路比传统比例采样模式LED驱动电路的恒流特性稳定度提高了41%。
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| 关 键 词： | 小信号等效电路 驱动电流 LED 比例 设计 功率MOSFET 电流采样 抽样 |
Design and research of an LED driving circuit with accurate proportional current sampling mode |
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| Guo Wei,Yang Xing and Zhu Dazhong.Design and research of an LED driving circuit with accurate proportional current sampling mode[J].Chinese Journal of Semiconductors,2010,31(4):045008-5. |
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| Authors: | Guo Wei Yang Xing and Zhu Dazhong |
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| Affiliation: | Department of Information Science and Electronics Engineering, Institute of Microelectronics and Optoelectronics, Zhejiang University, Hangzhou 310027, China;Department of Information Science and Electronics Engineering, Institute of Microelectronics and Optoelectronics, Zhejiang University, Hangzhou 310027, China;Department of Information Science and Electronics Engineering, Institute of Microelectronics and Optoelectronics, Zhejiang University, Hangzhou 310027, China |
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| Abstract: | |
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| Keywords: | LED driver accurate proportional current sampling constant current |
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