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MOSFETS </a> </div> </div> <div class="rig_con"> <div class="top"> <h1 class="title"> 一篇關于“MOS管選型”指南 </h1> <div class="meg"> <div class="firsts">發布時間：2021-10-08</div> <div class="">已被瀏覽：<span>3360</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：MOS管是電路中非常常見的元件，常用于信號開關、功率開關、電平轉換等用途。由于MOS管型號多，應用廣泛，所以MOS管選型需要考慮的因素很多，很多工程師在選型的時候覺得無從下手。今天小編就來分享一下MOS管的選型技巧。<br /> <br /> MOS管選型<br /> MOS管選型的第一步是確定是使用P溝道MOS管還是N溝道MOS管。這兩種MOS管驅動電壓完全不同。由于制造工藝的原因，P溝的MOS管通常比N溝的MOS管具有更大的導通電阻，這意味著導通功耗會更大。這是選擇時需要注意的地方。一般而言，如果是低邊開關應用，使用N溝MOS管是首選，驅動方便，選擇靈活。如果是高邊開關應用，P溝MOS管驅動相對簡單，但導通電阻相對較大，價格相對較高。N溝MOS管驅動比較復雜，一般需要額外的電源或者自動驅動。在選擇MOS管類型后，根據以下參數具體步驟進行選擇。<br /> <br /> MOS管參數選型<br /> （1）選擇MOS管的耐壓<br /> 解析：MOS管的耐壓性一般根據負載類型考慮余量。比如純阻力負載，開關頻率很低，余量可以小一些。如果是感性負載，或者開關頻率比較高，這種情況下容易出現較大的感應電動勢，需要考慮較大的余量；<br /> <br /> （2）選擇工作電流<br /> 解析：選擇工作電流，很多工程師都踩過這里的大坑。這里需要注意的是，MOS管規格書標稱的電流值只有在理想情況下才能達到，不能直接作為選用。MOS管通常用于功率開關和電流較大的MOS管，在選擇時考慮導通電阻。例如，我們這次需要的實際工作電流是2A。如果選擇導通電阻為100mr的MOS管，MOS管上的散耗功率為2*2*0.1=0.4W。假如是比較小的封裝，散熱條件不太好，那么這種發熱就比較嚴重了。暫時導通電阻在100mr以下；<br /> <br /> （3）選擇開關性能<br /> 解析：雖然MOS管是電壓控制元件，但由于Cgs等結電容的存在，對驅動電流仍有要求。驅動效果決定了MOS管開關過程中的損耗。在一定的驅動能力下，MOS管的結電容(柵極電荷)越小，開關損耗越??；<br /> <br /> （4）選擇封裝<br /> 解析：封裝的選擇取決于項目本身的安裝形式和散熱條件。例如，這次我們計劃選擇TO-220封裝，使用鋁散熱器。因此，從這種反推導通電阻的選擇來看，TO-220在有散熱器的情況下，可以達到幾瓦的散耗功率，因此0.4W的功率完全可以承受；<br /> <br /> 以上內容是MOS管基本選型過程，如需要MOS管相關產品請留言聯系或<span style="color:#FF0000;">撥打：0755-28100016；</span>海量MOS管現貨庫存，規格齊全。歡迎來咨詢價格或拿樣測試。<br /> <br /> 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