| 高精度宽范围可调的LED驱动控制器的设计与实现 |
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| 引用本文： | 代国定,虞峰,王悬,李卫敏.高精度宽范围可调的LED驱动控制器的设计与实现[J].半导体学报,2010,31(2):025010-6. |
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| 作者姓名： | 代国定 虞峰 王悬 李卫敏 |
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| 作者单位： | Laboratory;High-Speed;Circuit;Design;Ministry;Education;Xidian;University; |
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| 基金项目： | supported by the National Ministry Pre-Research Foundation of China(No.9140A08010208DZ0123);;the Applied Materials Innovation Foundation of Xi'an,China(No.XA-AM-200817) |
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| 摘 要： | 本文提出一种新颖的高精度宽范围可调的LED恒流驱动控制器的设计，与传统的恒流驱动电路不同，该电路采用漏端电压固定的MOS管代替传统的镜像电阻，并加入运放负反馈结构来保证所有镜像器件的端电压完全相等，得到不受输出端负载电压影响的精确可调的输出电流。同时通过新颖的电流分段镜像（CSM）机制，优化了镜像MOS管的电气特性，从而保证了高精度输出电流的宽范围。基于该方案采用TSMC 0.6μm BCD工艺设计实现了一款面积为1.1×0.7mm2的三通道LED恒流源驱动芯片。投片测试结果表明，该LED驱动控制器工作状态良好，输出电流范围为5mA～60mA，电流精度的相对误差小于1%，通道间电流匹配的相对误差不超过1.5%。
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| 关 键 词： | LED驱动芯片 驱动控制器 宽范围 高精度 设计 MOSFET 输出电流 负反馈放大器 |
Design and implementation of a high precision and wide range adjustable LED drive controller |
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| Dai Guoding,Yu Feng,Wang Xuan and Li Weimin.Design and implementation of a high precision and wide range adjustable LED drive controller[J].Chinese Journal of Semiconductors,2010,31(2):025010-6. |
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| Authors: | Dai Guoding Yu Feng Wang Xuan and Li Weimin |
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| Affiliation: | Key Laboratory of High-Speed Circuit Design and EMC of the Ministry of Education, Xidian University, Xi'an 710071, China;Key Laboratory of High-Speed Circuit Design and EMC of the Ministry of Education, Xidian University, Xi'an 710071, China;Key Laboratory of High-Speed Circuit Design and EMC of the Ministry of Education, Xidian University, Xi'an 710071, China;Key Laboratory of High-Speed Circuit Design and EMC of the Ministry of Education, Xidian University, Xi'an 710071, China |
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| Abstract: | This paper presents a novel high precision and wide range adjustable LED constant-current drive controller design.Compared with the traditional technique,the conventional mirror resistance is substituted by a MOSFET with fixed drain voltage,and a negative feedback amplifier is used to keep all mirror device voltages equal,so that the output current is precise and not affected by the load supply voltage.In addition,the electric property of the mirror MOSFET is optimized by a current subsection mirror(CSM) me... |
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| Keywords: | CSM mechanism BCD process LED drive controller |
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