Linear LT3760 8路LED驱动方案

2011-04-07 21:28:13来源: 互联网
Linear 公司的LT3760是集成了升压DC/DC控制器的 8路LED驱动器,能驱动高达45V的LED. 输入电压从6V 到 40V,40mA时的LED匹配电流为±2%,典型值为±0.7%,调光比高达3000:1,可编程的频率从100kHz到1MHz,主要用于汽车,笔记本低电脑和TV监视器的背光.本文介绍LT3760主要特性, 方框图, 36W, 28W, 15W,29W,25W以及14W LED驱动器应用电路.

The LTR3760 is an 8-channel LED driver with a step-up DC/DC controller capable of driving up to 45V of LEDs.

Each channel contains an accurate current sink with ±2% current matching. Channels follow a master programmable current to allow between 20mA to 100mA of LED current per string. Channels can be paralleled for higher LED current. Output voltage adapts to variations in LED VF for optimum efficiency and open LED faults do not affect the operation of connected LED strings.

The LT3760 allows a PWM dimming range up to 3000:1 and an analog dimming range up to 25:1. Operating frequency can be programmed from 100kHz up to 1MHz using a single resistor or synchronized to an external clock.

Additional features include: programmable maximum VOUT for open LED protection, a fault flag for open LED, programmable LED current derating vs temperature, micropower shutdown and internal soft-start. The LT3760 is available in a thermally enhanced 28-pin TSSOP Package.

LT3760主要特性:

Up to 45V of LEDsx 100mA,8-Channel LED Driver

Wide Input Range : 6V to 40V

±2% LED Current Matching at 40mA(Typ ±0.7%)

Up to 3000:1 True Color PWM™ Dimming Range

Single Resistor Sets LED Current (20mA to 100mA)

LED Current Regulated Even for PVIN > VOUT

Output Adapts to LED VF for Optimum Efficiency

Fault Flag + Protection for Open LED Strings

Protection for LED Pin to VOUT Short

Parallel Channels for Higher LED Current

Programmable LED Current Derating vs Temperature

Accurate Undervoltage Lockout Threshold with Programmable Hysteresis

Programmable Frequency (100kHz to 1MHz)

Synchronizable to an External Clock

LT3760应用:

Automotive, Notebook and TV Monitor Backlight


图1.LT3760方框图

图2.效率92% 36W背光LED驱动器

图3.效率92% 36W LED驱动器:1MHz升压,8串LED,每串100mA


图4.效率92% 28W LED驱动器:750kHz升压,8串LED,每串80mA


图5. 15W LED驱动器:750kHz升压,8串LED,每串55mA


图6. 29W LED驱动器:400kHz升压,2串LED,每串350mA


图7. 25W LED驱动器:400kHz升压,3串LED,每串200mA


图8. 28W LED驱动器:700kHz升压,4串LED,每串160mA


图9. 14W LED驱动器:700kHz升压,4串LED,每串80mA


图10. 28W LED驱动器:1MHz SPEIC,8串LED,每串100mA

关键字:驱动  方案

编辑:神话 引用地址:http://www.eeworld.com.cn/mndz/2011/0407/article_6624.html
本网站转载的所有的文章、图片、音频视频文件等资料的版权归版权所有人所有,本站采用的非本站原创文章及图片等内容无法一一联系确认版权者。如果本网所选内容的文章作者及编辑认为其作品不宜公开自由传播,或不应无偿使用,请及时通过电子邮件或电话通知我们,以迅速采取适当措施,避免给双方造成不必要的经济损失。
论坛活动 E手掌握
微信扫一扫加关注
论坛活动 E手掌握
芯片资讯 锐利解读
微信扫一扫加关注
芯片资讯 锐利解读
推荐阅读
全部
驱动
方案

小广播

独家专题更多

富士通铁电随机存储器FRAM主题展馆
富士通铁电随机存储器FRAM主题展馆
馆内包含了 纵览FRAM、独立FRAM存储器专区、FRAM内置LSI专区三大部分内容。 
走,跟Molex一起去看《中国电子消费品趋势》!
走,跟Molex一起去看《中国电子消费品趋势》!
 
带你走进LED王国——Microchip LED应用专题
带你走进LED王国——Microchip LED应用专题
 
电子工程世界版权所有 京ICP证060456号 京ICP备10001474号 电信业务审批[2006]字第258号函 京公海网安备110108001534 Copyright © 2005-2016 EEWORLD.com.cn, Inc. All rights reserved