基于LM5010A的LED恒流驱动

作者：陈燕，王正仕，邓焰 日期：2008-02-25/span> 浏览：4054 查看PDF文档

基于LM5010A的LED恒流驱动

陈燕，王正仕，邓焰
（浙江大学 电力电子研究所，浙江 杭州 310027）

摘要：采用LM5010A芯片,设计了在高输入/输出电压比场合下应用的LED驱动电路，其驱动、控制、调光方式分别采用更具优势的恒流驱动、恒定导通时间(COT)控制和PWM调光方式。实验证明,该驱动电路具有LED电流稳定、瞬态响应快、调光无色偏和低噪声的特点。
关键词：LM5010A；恒流驱动；恒定导通时间；脉宽调制；调光
中图分类号：TN86文献标识码：A文章编号：1001-4551(2008)02-0089-04

Constantcurrent driving of LED based on LM5010A
CHEN Yan, WANG Zheng-shi, DENG Yan
(Institute of Power Electronics, Zhejiang University, Hangzhou 310027, China)
Abstract: LED driver used in large step-down ratio applications was proposed, based on LM5010A. Constant-current driving, constant on-time (COT) control and pulse width  modulation(PWM) dimming which benefit LED driver more than other methods were adopted. The experiment result shows that the driver has the advantages of stable driving current, high transient response speed, no color shift and low noises.
Key words: LM5010A; constant-current driving; constant on-time(COT); pulse width modulation(PWM); dimming
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