电流型白光LED驱动芯片设计与电路优化
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摘要
电源管理产品广泛地应用于整个电子行业,是电子产品必不可少的组成部分之一。本文设计实现了DCM-CPM型的升压开关电源芯片,其输出电压和驱动能力满足设计要求。
     在DCM-CPM型开关电源电路设计中,本文结合PWM控制模式以及峰值电流控制环调节等理论给出设计依据,并根据功能需求进行了电路的总体结构设计和子电路设计。重点分析了电压基准源电路和跨导运算放大器(OTA),简要介绍了其他模块的电路结构和仿真波形。提出将遗传算法引入电路设计中,程序运算结果和仿真结果基本吻合,实现典型结构的模拟电路的电路级自动生成。该芯片采用标准的CSMC 0.6μm CMOS工艺,输入电压范围为2.6V~5V,输出电流为16mA。芯片设计了温度性能良好的电压基准源电路,工作温度范围为-40℃至100℃,温度系数为4ppm/℃。
     在完成电路结构设计的基础之上,应用EDA软件Cadence Spectre对各个子电路模块和整体电路进行了仿真,仿真结果均达到或优于预定指标,验证了设计理论。
Power manage products are widely used in the whole electronic industry andthey are the most important part of electronic products. This paper carries out aDCM-CPM Boost DC-DC converter which meets the specification.
     In the designing of the DCM-CPM Boost DC-DC converter, this paperpresents a circuit design based on the theory of PWM control mode andpeak-current control mode. Then the analysis of the whole chip structure andsub-circuits is presented in which voltage reference and OTA sub-circuits areemphasized on. GA(Genetic Algorithms) has been introduced into analog circuitdesign, which automates the analog circuit design. The chip adopts standard CSMC0.6μm CMOS process. The input voltage ranges from 2.6V to 5V and the outputcurrent is 16mA. The chip contains a voltage reference which has high temperaturecharacteristic and operates from -40℃to 100℃with temperature coefficient4ppm/℃.
     Followed the design of circuit structure, each module and the whole circuit intop level have been simulated in Cadence Spectre simulator and the simulationresults meet the specification which validate the theory.
引文
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