基于RT8482的大功率LED驱动电路设计  

Design of high power LED driver circuit based on RT8482

作　　者：朱佳[1] 许宜申[2] 陈太军[1] 成卓[1] 许峰川[1] 

机构地区：[1]苏州大学文正学院,江苏苏州215104 [2]苏州大学物理科学与技术学院,江苏苏州215006

出　　处：《现代电子技术》2012年第18期152-154,共3页Modern Electronics Technique

基　　金：江苏省高等学校大学生实践创新训练计划资助项目(2011);苏州大学学生科研基金资助项目(2011)

摘　　要：根据发光二极管的V-I特性,设计了一款基于RT8482芯片的升压恒流大功率LED驱动电路,其输出电压自适应。该电路主要包括输入电源反接保护单元、LED升压恒流驱动单元、PWM数字调光与变阻模拟调光单元、扩流输出单元等,电路同时还具有过压保护、过流保护等功能。测试结果及实际使用表明:该电路在12V输入电压下驱动84 W大功率白色LED灯珠阵列时输出电流恒定,其效率可达89.16%,且亮度调节范围宽、精度高,适用于通用与景观照明、汽车照明、室内装饰及电子设备背光等大功率LED照明应用领域。A RT8482-based boosting constant-current high-power LED drive circuit which outputs adaptive voltage was designed on the basis of V-I characteristics of I.ED. The circuit mainly consists of the input power polarity protection unit, LED boosting constant-current drive unit, PWM （pulse width modulation） digital dimming and variable resistance analog dimming unit, expanding-current output unit, and has the functions of overvoltage protection and overcurrent protection. The tes- ting results show that the designed ciucuit can output the constant current at the input voltage of 12 V when a high-brightness 84 W white LED array is drived, and its efficiency is up to 89.16 %. It has wide dimming range and high precision, and is ap- plicable to high power LED lighting areas, such as general and landscape lighting, automobile lighting, house decoration, baeklight of electronic devises and so on.

关 键 词：RT8482 恒流驱动 TL431 PWM调光 DC—DC 

分 类 号：TN911-34[电子电信—通信与信息系统] TM910.2[电子电信—信息与通信工程]