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基于RT8482的大功率LED驱动电路设计

更新时间:2020-06-24 22:16:56 大小:485K 上传用户:六3无线电查看TA发布的资源 标签:rt8482大功率led驱动电路 下载积分:5分 评价赚积分 (如何评价?) 收藏 评论(0) 举报

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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。

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 an...

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