| 基于RT8482的大功率LED驱动电路设计 |
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| 引用本文： | 朱佳,许宜申,陈太军,成卓,许峰川.基于RT8482的大功率LED驱动电路设计[J].现代电子技术,2012,35(18):152-154. |
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| 作者姓名： | 朱佳 许宜申 陈太军 成卓 许峰川 |
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| 作者单位： | 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 |
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| 基金项目： | 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) |
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| 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84w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。
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| 关 键 词： | RT8482 恒流驱动 TL431 PWM调光 DC—DC |
Design of high power LED driver circuit based on RT8482 |
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| ZHU Jia
,
XU Yi-shen
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CHEN Tai-jun
,
CHENG Zhuo
,
XU Feng-chuan.Design of high power LED driver circuit based on RT8482[J].Modern Electronic Technique,2012,35(18):152-154. |
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| Authors: | ZHU Jia XU Yi-shen CHEN Tai-jun CHENG Zhuo XU Feng-chuan |
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| Affiliation: | 1(1.Wenzheng College,Soochow University,Suzhou 215104,China; 2.College of Physics Science and Technology,Soochow University,Suzhou 215006,China) |
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| Abstract: | 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 LED.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 testing 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 applicable to high power LED lighting areas,such as general and landscape lighting,automobile lighting,house decoration,backlight of electronic devises and so on. |
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| Keywords: | RT8482 constant-current drive TL431 PWM dimming DC-DC |
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