16通道LED大屏恒流驱动芯片的仿真设计与测试

发布时间：2018-04-18 23:13

本文选题：LED大屏幕显示 + 恒流输出　；参考：《电子科技大学》2010年硕士论文

【摘要】： 随着科技的进步和电子技术的不断发展,人们对大屏幕显示的要求也逐渐提高,普通的通用电源驱动芯片已远远不能满足要求。LED显示屏作为一种高科技的电子产品逐步引起人们的重视,它已广泛地应用于电信、邮政、金融、交通、体育场馆和户外广告等各个行业及政府工作部门。与此同时,人们对LED的显示屏的要求也向大屏幕、高均匀性、高画面品质、长寿命的方向发展,因此,一种多通道、输出电流高度精确的LED专用驱动芯片就成为研究的重点。本文详细的介绍了一种带有保护功能的16通道LED专用恒流驱动控制芯片的设计,以及几个功能模块和性能指标的仿真验证。该芯片设计所要求的工作电压范围为3.3V-5V,各通道的输出电流范围为3mA-60mA,而且输出电流大小精确可调,时钟频率达25MHz,以满足大量数据的传输要求。设计中的电路包括SDI输入端口模块,SDO输出端口模块,基准电压模块,电流调节模块,过温保护模块,输出级模块等不同的模块电路。本文是基于0.35um混合信号CMOS工艺,运用Cadence工作平台,对各模块电路进行了仿真验证,并在此基础上对整体电路进行了联合功能仿真验证和测试分析。芯片内部的输出电流误差小于3%,芯片之间的输出电流误差小于6%,它相比以往常用的16通道LED恒流驱动器,有更优的输出电流调节精度以及更高的电流匹配精度,同时还拥有较小的芯片面积,在工业生产中可以极大提高芯片产量并大大降低单位芯片的生产成本。
[Abstract]:With the progress of science and technology and the development of electronic technology, people's demand for large screen display has been gradually raised.As a high-tech electronic product, the common universal power driver chip has been far from being able to meet the requirements. As a high-tech electronic product, it has been widely used in telecommunications, postal, finance and transportation.Sports venues and outdoor advertising and other industries and government departments.At the same time, the demand for LED display screen is also developing towards the direction of large screen, high uniformity, high picture quality and long life. Therefore, a kind of multi-channel, high-precision LED driver chip with high output current becomes the focus of research.This paper introduces in detail the design of a 16-channel LED special constant-current drive control chip with protection function, as well as the simulation verification of several functional modules and performance indexes.The working voltage range of the chip is 3.3V-5V, the output current range of each channel is 3mA-60mA. the output current can be adjusted accurately and the clock frequency can reach 25MHz to meet the requirement of large amount of data transmission.The circuits in the design include SDI input port module, reference voltage module, current regulation module, over-temperature protection module, output stage module and so on.This paper is based on the 0.35um mixed signal CMOS process, using the Cadence working platform, the simulation of each module circuit is verified, and on this basis, the whole circuit is verified and tested by the joint function simulation and analysis.The output current error within the chip is less than 3 and the output current error between the chips is less than 6. Compared with the 16-channel LED constant current driver, it has better output current regulation accuracy and higher current matching accuracy.At the same time, it also has a small chip area, which can greatly increase the chip output and greatly reduce the production cost of the unit chip in industrial production.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2010
【分类号】：TN312.8

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