LT3420-1 具自动刷新功能的照相机闪光灯电容器充电器 _BDTIC代理LT3420-1/title> <meta name="Description" content="BDTIC 代理linear 凌力尔特 LT3420-1, LT3420EDD, LT3420EDD#PBF, LT3420EDD#TR, LT3420EDD#TRPBF, LT3420EDD-1, LT3420EDD-1#PBF, LT3420EDD-1#TR, LT3420EDD-1#TRPBF, LT3420EMS, LT3420EMS#PBF, LT3420EMS#TR, LT3420EMS#TRPBF, LT3420EMS-1, LT3420EMS-1#PBF, LT3420EMS-1#TR, LT3420EMS-1#TRPBF"> <meta name="keywords" content=" LT3420-1, LT3420EDD, LT3420EDD#PBF, LT3420EDD#TR, LT3420EDD#TRPBF, LT3420EDD-1, LT3420EDD-1#PBF, LT3420EDD-1#TR, LT3420EDD-1#TRPBF, LT3420EMS, LT3420EMS#PBF, LT3420EMS#TR, LT3420EMS#TRPBF, LT3420EMS-1, LT3420EMS-1#PBF, LT3420EMS-1#TR, LT3420EMS-1#TRPBF"> <meta name="author" content="BDTIC"> <meta name="Copyright" content="龙人">   <link href="http://support.bdtic.com/css/public.cn.css" media="screen" rel="stylesheet" type="text/css"> <link href="http://support.bdtic.com/css/jquery-ui-1.12.1.min.darkness.css" media="screen" rel="stylesheet" type="text/css"> <script type="text/javascript" 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</div> </div> <div class="navbar"> <div class="container"> <div class="left"> <ul> <li><a href="/manufacturer">MANUFACTURERS 品牌厂家</a></li> <li><a href="/product">PRODUCTS 产品服务</a></li> <li><a href="/support">SUPPORT 设计支持</a></li> <li><a href="/contact">CONTACT 联系购买</a></li> </ul> </div> </div> </div> <div class="body">  <div id='breadcrumb' class='container'><a href="../Semiconductor/index.html">首页</a> > <a href="index.html">linear 凌力尔特</a> > <a href="Signal-Conditioning/index.html">电源管理</a> > <a href="Power/SwitchingRegulator/index.html">开关稳压器</a></div> <div class="container"> <h3>LT3420-1 具自动刷新功能的照相机闪光灯电容器充电器</h3> <p align="left">LT®3420 / LT3420-1 可快速高效地为高电压照相机闪光灯电容器充电。这些器件专为适用于数码相机和胶片相机而设计，其采用一种反激式拓扑以实现优于同类竞争闪光灯模块高达 4 倍的效率水平。独特的自适应关断时间控制算法能在整个充电周期中保持电流受限的连续模式变压器操作，从而消除了此类模块中常见的高浪涌电流。</p> <p align="left">LT3420 / LT3420-1 输出电压检测电路负责监视反激电压以直接调节输出电压，因而免除了一个输出电阻分压器或分立式齐纳二极管。该特性使得能在不产生过大功耗的情况下将电容器保持在满充电状态。自动刷新功能 (可停用) 允许电容器在保持充电的同时以用户定义的刷新速率消耗大约 2mA 的平均输入电流。当 CHARGE 引脚为逻辑高电平时将启动充电操作，而 DONE 引脚则用于在电容器满充电时发出指示信号。</p> <p align="left">LT3420 / LT3420-1 采用 10 引脚 MSOP 和 (3mm x 3mm) DFN 封装。</p> <table width="100%"> <tr> <td width="50%" align="left" valign="top"><h5>产品特点 Features </h5> <UL> <LI>可采用 5V 电源在 3.7s 内将 220μF 电容器充电至 320V (LT3420)</LI> <LI>可采用 5V 电源在 3.5s 内将 100μF 电容器充电至 320V (LT3420-1)</LI> <LI>可为任意大小的照相机闪光灯电容器充电</LI> <LI>支持采用两节 AA 电池或任何电压范围为 1.8V 至 16V 的电源运作</LI> <LI>受控的峰值开关电流：1.4A (LT3420) <BR> 1.0A (LT3420-1) </LI> <LI>受控的输入电流：840mA (LT3420) <BR> 450mA (LT3420-1) </LI> <LI>采用标准变压器</LI> <LI>高效反激式操作 (典型效率 > 75%)</LI> <LI>可调输出</LI> <LI>自动刷新</LI> <LI>充电完成指示器</LI> <LI>无需高电压齐纳二极管</LI> <LI>无需输出电压分压器</LI> <LI>小外形 10 引脚 MSOP 封装</LI> <LI>小外形 10 引脚 (3mm x 3mm) DFN 封装</LI> </UL> </td> <td width="50%" align="left" valign="top"><h5>应用</h5> <UL> <LI>数码相机闪光灯单元</LI> <LI>胶片相机闪光灯单元</LI> <LI>高电压电源</LI> </UL> <h5>典型应用图</h5> <img src="../image/linear/LT3420.jpg" alt="LT3420 典型应用"> <h5>参数</h5> <img src="../image/linear/canshu_LT3420.jpg" alt="LT3420 参数"></td> </tr> </table> <h5>LT3420-1 订购信息和价格参考Package Variations and Pricing</h5> <table class="sheet" width="100%"> <tr bgcolor="#E7E7E7"> <TD>器件型号</TD> <TD>封装</TD> <TD>引脚</TD> <TD>温度</TD> <TD>价格 (以 1 ~ 99 片为批量)</TD> <TD>价格 (以 1000 片为批量) *</TD> </TR> <tr> <td>LT3420EDD</td> <td>DFN</td> <td x:num="10">10</td> <td>E</td> <td x:num="3.57">$3.57 </td> <td x:num="2.5">$2.50 </td> </tr> <tr> <td>LT3420EDD#PBF</td> <td>DFN</td> <td x:num="10">10</td> <td>E</td> <td x:num="3.57">$3.57 </td> <td x:num="2.5">$2.50 </td> </tr> <tr> <td>LT3420EDD#TR</td> <td>DFN</td> <td x:num="10">10</td> <td>E</td> <td></td> <td x:num="2.6">$2.60 </td> </tr> <tr> <td>LT3420EDD#TRPBF</td> <td>DFN</td> <td x:num="10">10</td> <td>E</td> <td></td> <td x:num="2.6">$2.60 </td> </tr> <tr> <td>LT3420EDD-1</td> <td>DFN</td> <td x:num="10">10</td> <td>E</td> <td x:num="3.57">$3.57 </td> <td x:num="2.5">$2.50 </td> </tr> <tr> <td>LT3420EDD-1#PBF</td> <td>DFN</td> <td x:num="10">10</td> <td>E</td> <td x:num="3.57">$3.57 </td> <td x:num="2.5">$2.50 </td> </tr> <tr> <td>LT3420EDD-1#TR</td> <td>DFN</td> <td x:num="10">10</td> <td>E</td> <td></td> <td x:num="2.6">$2.60 </td> </tr> <tr> <td>LT3420EDD-1#TRPBF</td> <td>DFN</td> <td x:num="10">10</td> <td>E</td> <td></td> <td x:num="2.6">$2.60 </td> </tr> <tr> <td>LT3420EMS</td> <td>MSOP</td> <td x:num="10">10</td> <td>E</td> <td x:num="3.57">$3.57 </td> <td x:num="2.5">$2.50 </td> </tr> <tr> <td>LT3420EMS#PBF</td> <td>MSOP</td> <td x:num="10">10</td> <td>E</td> <td x:num="3.57">$3.57 </td> <td x:num="2.5">$2.50 </td> </tr> <tr> <td>LT3420EMS#TR</td> <td>MSOP</td> <td x:num="10">10</td> <td>E</td> <td></td> <td x:num="2.56">$2.56 </td> </tr> <tr> <td>LT3420EMS#TRPBF</td> <td>MSOP</td> <td x:num="10">10</td> <td>E</td> <td></td> <td x:num="2.56">$2.56 </td> </tr> <tr> <td>LT3420EMS-1</td> <td>MSOP</td> <td x:num="10">10</td> <td>E</td> <td x:num="3.57">$3.57 </td> <td x:num="2.5">$2.50 </td> </tr> <tr> <td>LT3420EMS-1#PBF</td> <td>MSOP</td> <td x:num="10">10</td> <td>E</td> <td x:num="3.57">$3.57 </td> <td x:num="2.5">$2.50 </td> </tr> <tr> <td>LT3420EMS-1#TR</td> <td>MSOP</td> <td x:num="10">10</td> <td>E</td> <td></td> <td x:num="2.56">$2.56 </td> </tr> <tr> <td>LT3420EMS-1#TRPBF</td> <td>MSOP</td> <td x:num="10">10</td> <td>E</td> <td></td> <td x:num="2.56">$2.56 </td> </tr> </table> <h5>LT3420-1 数据手册及相关资料下载</h5> <ol> <li>数据手册(英文) : <a href="../datasheet/linear/LT3420.pdf" target="_blank">LT3420/LT3420-1 - Photoflash Capacitor Chargers with Automatic Refresh</a>.PDF</li> <li>设计要点 (英文) : <a href="../download/linear/dn303f.pdf" target="_blank">DN303 - Photoflash Capacitor Charger Has Fast Efficient Charging and Low-Battery Drain</a>.PDF</li> <li>可靠性数据 : <a href="../download/linear/r324.pdf" target="_blank">R324 Reliability Data</a> .PDF</li> </ol> </div>  </div> <div class="footer"> <div class="container"> <div class="l"> <h5><a href="/product">Products 产品服务</a></h5> <ul> <li><a href="/semiconductor/Microcontroller">微处理器</a></li> <li><a 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