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MOSFETS </a> </div> </div> <div class="rig_con"> <div class="top"> <h1 class="title"> “開關電源線路”為什么推薦使用“貼片電容”？ </h1> <div class="meg"> <div class="firsts">發布時間：2021-08-25</div> <div class="">已被瀏覽：<span>2101</span>次</div> <div class="shape"> <span>分享到：</span> <div class="bdsharebuttonbox" style="display:inline-block;vertical-align:middle;"><a href="#" class="bds_more" data-cmd="more"></a><a href="#" class="bds_qzone" data-cmd="qzone" title="分享到QQ空間"></a><a href="#" class="bds_tsina" data-cmd="tsina" title="分享到新浪微博"></a><a href="#" class="bds_sqq" data-cmd="sqq" title="分享到QQ好友"></a><a href="#" class="bds_weixin" data-cmd="weixin" title="分享到微信"></a><a href="#" class="bds_renren" data-cmd="renren" title="分享到人人網"></a></div> <script> window._bd_share_config={"common":{"bdSnsKey":{},"bdText":"","bdMini":"2","bdMiniList":false,"bdPic":"","bdStyle":"0","bdSize":"16"},"share":{}};with(document)0[(getElementsByTagName('head')[0]||body).appendChild(createElement('script')).src='http://bdimg.share.baidu.com/static/api/js/share.js?v=89860593.js?cdnversion='+~(-new Date()/36e5)]; </script> </div> </div> </div> <div class="con"> <span style="font-family:新宋體,arial;"><span style="font-size:16px;"><span style="line-height:200%;">前言：開關電源和LDO輸出都建議使用<a href="http://www.forsakring-online.com/"><span style="color:#FF0000;"><strong>貼片電容器</strong></span></a>。貼片電容器具有良好的高頻性能和相對較低的介質損耗，尤其是其諧振等效串聯電阻ESR非常小，如33pF，諧振下的等效電阻只有0.15歐姆。這是電解電容器，包括鉭電容器無法比擬的，基本上沒有漏電流，也沒有極性。過去，貼片電容不是很大，所以通常需要一個貼片電容并聯一個鉭電容?，F在貼片電容做的是接近小容量的鉭電容，所以很多都是直接用貼片電容代替的。</span></span></span><br /> <img alt="“開關電源線路”為什么推薦使用“貼片電容”？" src="/u_file/2107/photo/2107/2021073018030660.jpeg" /><br /> <br /> <span style="font-family:新宋體,arial;"><span style="font-size:16px;"><span style="line-height:200%;">另外，貼片電容器本身的電感特別小，高頻性能好，很多電源都是用10uF的貼片電容器直接處理的，不需要再連接100nF等。由于此時諧振點意義不大，0805封裝10uF貼片電容在10MHz下的阻抗為0.03歐姆，100MHz下的阻抗為0.32歐姆，1000MHz下的阻抗為3.2歐姆。從這些數據來看，只要100兆赫以下的功率不太大，就沒有必要并聯諧振頻點的小電容器。<br /> <br /> 需要注意的是，很多朋友在接線的時候，比如雙面板，很多人都知道接線電容器靠近設備，導線盡量短，但是他們在接線的時候忘記了考慮貼片電容器的地板焊盤的電路，一般來說PCB的底面是一層的參考。必須記住，所有正面焊盤都必須在主地上開孔。否則，如果地面電路過長，這個貼片電容器就沒有意義，好東西也會因為設計布線的問題而浪費。這個問題，很多有經驗的PCB工程師都會犯這個錯誤。<br /> <br /> 關于這篇“開關電源線路”為什么推薦使用“貼片電容”內容就到這，如需要貼片電容相關產品請留言聯系或<span style="color:#FF0000;">撥打：0755-28100016；</span>海量貼片電容庫存，規格齊全。歡迎來咨詢價格或拿樣測試。<br /> <br /> 深圳順?？萍加邢薰臼且患乙源頌橹鞯碾娮釉骷?、半導體器件、保護器件的整合供應商，主營TVS瞬態抑制二極管、ESD靜電保護器、GDT陶瓷氣體放電管、TSS半導體放電管、NTC熱敏電阻、壓敏電阻、保險絲、合金電阻、貼片電阻、精密電阻、晶圓電阻、貼片保險絲、自恢復保險絲、貼片電容、鉭電容、電解電容、鋁電解電容、超級電容、連接器等相關產品線，品牌可選華德、碩凱、薩瑞微、億能、特思嘉、基美(KEMET)、天二、旺詮、大毅、村田、太誘、TDK、AVX、威世、風華、華新科、三瑩、國巨、立隆、厚聲、光頡、順絡、麥捷、禾伸堂等知名品牌。</span></span></span> </div> <div id="page" class="wow fadeInUp wrap"> <div class="page-btn prev">上一篇 : <a href="/faq/news-i01495i1.html">貼片電容“容抗”計算方法-知識篇</a></div> <div 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