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<main id="main" class="site-main" role="main"> <article id="post-789262" class="post-789262 post type-post status-publish format-standard hentry category-control"> <header class="entry-header"> <h1 class="entry-title">LTC7803或先进电源便捷设计之路</h1> </header> <div class="entry-content"> <div class="single-content"> <div class="ad-pc ad-site"></div> <p>　　简介</p> <p>　　LTC7803是ADI公司开发的一款同步降压型控制器，可简化高性能电源的设计。这款控制器具有以下主要特性：集成低阻抗栅极驱动器，能够切换N通道MOSFET，从而降低整体转换器成本，提高效率;极低工作静态电流(5 μA);40 V宽输入/输出电压范围;100 kHz至3 MHz的极高可编程开关频率范围;检测电阻或DCR检测可进一步提升效率;以及100%占空比。另外支持Spread Spectrum®(扩频)操作。LTC7803在±15%范围内调节开关频率，这可简化EMI合规要求并降低EMI滤波器成本。</p> <p>　　电气原理图和功能</p> <p>　　降压型转换器的电气原理图如图1所示。该转换器从5 V至38 V输入轨提供3.3 V电压和20 A。电驱动系统包括MOSFET Q1至Q4、电感L1和输入/输出滤波器电容。MODE引脚和跳线JP1定义强制连续导通、跳脉冲或Burst Mode® (突发模式)操作。每种操作模式都各有优缺点。在FCM中，整个输出电流范围内的低输出纹波以牺牲轻负载下的效率为代价。突发模式可在轻负载或无负载下提供高效率，但轻负载下的输出电压纹波更高。</p> <figure class="wp-block-image"><img loading="lazy" class="alignnone size-full wp-image-789266" data-original="https://u.eeany.cn/news%2Fuploads%2F2020%2F07%2Ffigure1-6.jpg" src="https://news.eeany.cn/wp-content/themes/begin/img/blank.gif" alt="LTC7803或先进电源便捷设计之路" width="1540" height="1020" alt="Electrical schematic of an LTC7803-based converter" /></figure> <noscript><img loading="lazy" class="alignnone size-full wp-image-789266" src="https://u.eeany.cn/news%2Fuploads%2F2020%2F07%2Ffigure1-6.jpg" alt="LTC7803或先进电源便捷设计之路" width="1540" height="1020" alt="Electrical schematic of an LTC7803-based converter" /></figure></noscript> <p>　　图1. 基于LTC7803的转换器电气原理图，VIN为5 V至38 V，VOUT为3.3 V(20A时)。</p> <p>　　LTC7803的另一个优势是能够与外部时钟同步，从而可避免主机系统中不同频率相互作用造成干扰问题。跳线JP2 (FREQ SET)允许在固定频率之间选择、同步到外部时钟或进行扩频操作。请注意，如果选择突发模式(MODE引脚连接至GND)并激活同步功能(PLLIN/Spread引脚上的时钟脉冲)，则控制器在FCM中运行。从实际的角度来说，在这种情况下最好使用脉冲跳跃模式。脉冲跳跃模式(通过100 kΩ电阻将MODE引脚连接至INTVCC )在轻负载下提供的效率要比FCM高得多。</p> <p>　　效率和扩频操作</p> <p>　　图2显示了突发模式下具有不同输入电压的转换器效率。</p> <figure class="wp-block-image"><img loading="lazy" class="alignnone size-full wp-image-789268" data-original="https://u.eeany.cn/news%2Fuploads%2F2020%2F07%2Ffigure2-6.jpg" src="https://news.eeany.cn/wp-content/themes/begin/img/blank.gif" alt="LTC7803或先进电源便捷设计之路" width="950" height="720" alt="Converter efficiency in pulse skip" /></figure> <noscript><img loading="lazy" class="alignnone size-full wp-image-789268" src="https://u.eeany.cn/news%2Fuploads%2F2020%2F07%2Ffigure2-6.jpg" alt="LTC7803或先进电源便捷设计之路" width="950" height="720" alt="Converter efficiency in pulse skip" /></figure></noscript> <p>　　图2. 脉冲跳跃和突发工作模式下的转换器效率。</p> <p>　　图3所示的DC2834A演示板用于LTC7803评估。图4显示DC2834在满载下的热图像。</p> <figure class="wp-block-image"><img loading="lazy" class="alignnone size-full wp-image-789269" data-original="https://u.eeany.cn/news%2Fuploads%2F2020%2F07%2Ffigure3-5.jpg" src="https://news.eeany.cn/wp-content/themes/begin/img/blank.gif" alt="LTC7803或先进电源便捷设计之路" width="2560" height="1965" alt="DC2834A demo board" /></figure> <noscript><img loading="lazy" class="alignnone size-full wp-image-789269" src="https://u.eeany.cn/news%2Fuploads%2F2020%2F07%2Ffigure3-5.jpg" alt="LTC7803或先进电源便捷设计之路" width="2560" height="1965" alt="DC2834A demo board" /></figure></noscript> <p>　　图3. DC2834A演示板。</p> <figure class="wp-block-image"><img loading="lazy" class="alignnone size-full wp-image-789271" data-original="https://u.eeany.cn/news%2Fuploads%2F2020%2F07%2Ffigure4-5.jpg" src="https://news.eeany.cn/wp-content/themes/begin/img/blank.gif" alt="LTC7803或先进电源便捷设计之路" width="900" height="600" alt="Converter thermal image" /></figure> <noscript><img loading="lazy" class="alignnone size-full wp-image-789271" src="https://u.eeany.cn/news%2Fuploads%2F2020%2F07%2Ffigure4-5.jpg" alt="LTC7803或先进电源便捷设计之路" width="900" height="600" alt="Converter thermal image" /></figure></noscript> <p>　　图4. 在自然对流冷却、没有空气流动的情况下，VIN为12 V、VOUT为3.3 V，电流为20 A时，转换器的热图像。</p> <p>　　扩频操作是LTC7803的一个重要优势。该特性大幅降低了转换器的辐射和传导噪声，并显著简化了整个系统对EMI标准的合规要求。图5比较了在CISPR 25 5类限制下，有扩频操作和无扩频操作的两次传导EMI扫描结果。</p> <figure class="wp-block-image"><img loading="lazy" class="alignnone size-full wp-image-789272" data-original="https://u.eeany.cn/news%2Fuploads%2F2020%2F07%2Ffigure5-2.jpg" src="https://news.eeany.cn/wp-content/themes/begin/img/blank.gif" alt="LTC7803或先进电源便捷设计之路" width="900" height="700" alt="Conducted EMI sweeps" /></figure> <noscript><img loading="lazy" class="alignnone size-full wp-image-789272" src="https://u.eeany.cn/news%2Fuploads%2F2020%2F07%2Ffigure5-2.jpg" alt="LTC7803或先进电源便捷设计之路" width="900" height="700" alt="Conducted EMI sweeps" /></figure></noscript> <p>　　图5. 在CISPR 25 5类限制下启用和禁用扩频操作(固定频率)的传导EMI扫描结果。</p> <p>　　结论</p> <p>　　低IQ 同步降压型控制器LTC7803可显著简化高效率功率转换器设计。它能够在各种输入/输出电压下工作，并具有出色的瞬态响应性能。LTC7803具有一些极重要的特性，如突发模式和扩频操作，进一步提高了效率和EMI标准合规性。</p> </div> <div class="ad-pc ad-site"> </div> <div class="clear"></div> <div id="social"> <div class="social-main"> <span class="like"> <a href="javascript:;" data-action="ding" data-id="789262" title="我赞" class="favorite"><i class="fa fa-thumbs-up"></i>赞 <i class="count"> 0</i> </a> </span> <span class="shang-p"> <span class="tipso_style" id="tip-p" data-tipso=' <div id="shang"> <div class="shang-main"> <h4><i 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LTC7803或先进电源便捷设计之路 |电子通-应用新知，新电子的助推者 电子通

LTC7803或先进电源便捷设计之路 |电子通-应用新知，新电子的助推者电子通