| Linear LT3593白光LED驱动方案 |
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| 作者：Linear 来源：中电网 点击数：218 更新时间：2008-5-7 |
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Linear 公司的LT3593是降压DC/DC转换器,用单节3V锂电池可驱动多达10个串联的白光LED,并具有.32:1的线性亮度控制范围,可广泛应用在手机,数码相机,PDA,手提计算机,MP3播放器和GPS接收器.本文介绍了LT3593的主要性能,方框图以及驱动不同数量LED的应用电路图.
The LT3593 is a step-up DC/DC converter designed to drive up to ten white LEDs in series from a Li-Ion cell.
Series connection of the LEDs provides identical LED currents and eliminates the need for ballast resistors. The device features a unique high side LED current sense that enables the part to function as a “one wire current source” where the low side of the LED string can be returned to ground anywhere.
Additional features include output disconnect in shutdown, open LED protection and 1-pin shutdown/LED current control. The CTRL pin is toggled to adjust the LED current via an internal counter and a 5-bit DAC.
The LT3593 switches at 1MHz, allowing the use of tiny external components. Constant frequency switching results in low input noise and a small output capacitor. The LT3593 is available in the 6-lead DFN (2mmX2mm) as well as the 6-lead SOT-23 packages.
主要特性:
Drives Up to Ten White LEDs from a 3V Supply
One Pin Shutdown and Current Programming
LEDs Disconnected in Shutdown
32:1 Linear Brightness Control Range
VIN Range: 2.7V to 5.5V
±5% Output Current Accuracy at Full Scale
Low Shutdown Current: 3μA
1MHz Switching Frequency
Requires Only 1μF Output Capacitor
Low Profi le 6-Lead DFN (2mmX2mmX0.75mm) and 6-Lead SOT-23 Packages
应用:
Cell Phones
Digital Cameras
PDAs, Handheld Computers
MP3 Players
GPS Receivers
图1. LT3593方框图
图2. 锂电池驱动10个白光LED电路图
图3. 两节AA电池驱动3个白光LED电路图
图4. 锂电池驱动单个白光LED电路图
图5. 锂电池驱动两个白光LED电路图
图6. 锂电池驱动3个白光LED电路图
图7. 锂电池驱动4个白光LED电路图
图8. 锂电池驱动6个白光LED电路图
详情请见:
>http://www.linear.com/pc/downloadDocument.do?navId=H0,C1,C1003,C1094,C1766,P80613,D26255
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