| 一种用于LED驱动的恒流控制电路设计 |
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| 引用本文： | 王易,徐祥柱,黎兆宏,明鑫,周泽坤,张波.一种用于LED驱动的恒流控制电路设计[J].微电子学,2012,42(2):229-232. |
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| 作者姓名： | 王易 徐祥柱 黎兆宏 明鑫 周泽坤 张波 |
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| 作者单位： | 电子科技大学 电子薄膜与集成器件国家重点实验室,成都,610054 |
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| 摘 要： | 提出一种用于LED驱动的恒流控制电路,通过对一个基准电流进行放大,得到LED的输出电流；通过改变基准电流的大小,可以按比例改变输出电流的大小,即实现LED驱动的模拟调光功能.该电路对基准电流进行2000倍的放大,基准电流可以在5～110 μA的范围内变化,能满足常规LED驱动芯片模拟调光功能的要求.仿真结果表明,该电路产生的LED输出电流误差小于0.03％,对温度敏感性小,能在较大温度范围内保持正常工作,且设计了相关的修调电路,使电路的匹配性更好、精度更高.
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| 关 键 词： | LED驱动 恒流控制 模拟调光 |
Design of Constant-Current Controlled Circuit for LED Driver |
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| WANG Yi
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XU Xiangzhu
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LI Zhaohong
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MING Xin
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ZHOU Zekun
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ZHANG Bo.Design of Constant-Current Controlled Circuit for LED Driver[J].Microelectronics,2012,42(2):229-232. |
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| Authors: | WANG Yi XU Xiangzhu LI Zhaohong MING Xin ZHOU Zekun ZHANG Bo |
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| Affiliation: | (State Key Lab of Electronic Thin Films and Integrated Device,Univ.of Elec.Sci.& Technol.of China,Chengdu 610054,P.R.China) |
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| Abstract: | A constant-current controlled circuit for LED driver was proposed,which obtained LED output current by amplifying a reference current.So,the output current changed with the reference current proportionally,thus realizing analog dimming function of the LED driver.The circuit was designed to amplify the reference current by 2 000 times,which varied from 5 μA to 110 μA,satisfying the requirement of analog dimming for LED drivers.Simulation results indicated that the circuit had an output current error less than 0.03%,and the output current was not sensitive to temperature,and it could operate properly in a wide temperature range.In addition,trimming structures were also designed for the circuit to achieve better matching and accuracy. |
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| Keywords: | LED driver Constant-current control Analog dimming |
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