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Linear LT3593白光LED驱动方案

2010-08-17 15:20
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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

LT3593方框图

图1. LT3593方框图

锂电池驱动10个白光LED电路图

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

锂电池驱动单个白光LED电路图

图4. 锂电池驱动单个白光LED电路图

锂电池驱动两个白光LED电路图

图5. 锂电池驱动两个白光LED电路图

锂电池驱动3个白光LED电路图

图6. 锂电池驱动3个白光LED电路图

 锂电池驱动4个白光LED电路图

图7. 锂电池驱动4个白光LED电路图

锂电池驱动6个白光LED电路图

图8. 锂电池驱动6个白光LED电路图
 

声明: 本文由入驻维科号的作者撰写,观点仅代表作者本人,不代表OFweek立场。如有侵权或其他问题,请联系举报。

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