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<section> <article> <h1>小功率LED驅(qū)動電源技術(shù)拓?fù)浞桨?/h1> <div id="ytofavu" class="authorTimeSource"> <span>作者：</span> <span>時(shí)間：2012-12-26</span> <span>來源：網(wǎng)絡(luò)</span> <link rel="stylesheet" type="text/css"/> <span style="float:right; width:150px;margin-right:0px; text-align:right;"> <div id="vyeqlvn" class="nav0"> <ul> <li style="width:150px;"><a href="javascript:void(0);"><img src="http://www.ex-cimer.com/event/action/images/icon_add_4.png" width="20" border="0" align="absmiddle" />英飛凌汽車電子生態(tài)圈</a> <ul> <li style="width:150px;text-align:center;"><img src="http://www.ex-cimer.com/event/company/images/code_2.jpg" width="150"><br />掃碼關(guān)注<br />獲取最新最全汽車電子<br />技術(shù)方案與實(shí)用技巧</li> </ul> </li> </ul> </div> </span> <span style="float:right; width:30px;margin-right:0px; text-align:right;"><a rel="nofollow">收藏</a></span> </div> <div id="rnarpoj" class="hAd4_Afinal20a_back">  <iframe id='a890e388' name='a890e388' src='https://ad.eepw.com.cn/www/delivery/afr.php?zoneid=88&cb=INSERT_RANDOM_NUMBER_HERE' frameborder='0' scrolling='no' width='660' height='60'><a target='_blank'><img src='https://ad.eepw.com.cn/www/delivery/avw.php?zoneid=88&cb=INSERT_RANDOM_NUMBER_HERE&n=a635e61e' border='0' alt='' /></a></iframe> </div> <div style="margin-top:28px;"></div> <div id="rfpkqhg" class="content" id="contentDiv" style="position:relative;"> <div id="jikqpsr" class="ad_300x180_Afinal13_back">  <iframe id='a225770a' name='a225770a' src='https://ad.eepw.com.cn/www/delivery/afr.php?zoneid=87&cb=INSERT_RANDOM_NUMBER_HERE' frameborder='0' scrolling='no' width='300' height='200'><a target='_blank'><img src='https://ad.eepw.com.cn/www/delivery/avw.php?zoneid=87&cb=INSERT_RANDOM_NUMBER_HERE&n=a576c0a2' border='0' alt='' /></a></iframe> </div> <span id="contentlabels" style="font-size:14px;"><p><span id="pkqhcmh" class="Apple-style-span" style="word-spacing: 0px; font: 14px/30px 宋體; text-transform: none; color: rgb(17,17,17); text-indent: 0px; white-space: normal; letter-spacing: normal; background-color: rgb(255,255,255); text-align: left; webkit-text-size-adjust: auto; orphans: 2; widows: 2; webkit-text-decorations-in-effect: none; webkit-text-stroke-width: 0px"><p style="border-top-width: 0px; padding-right: 0px; padding-left: 0px; border-left-width: 0px; border-bottom-width: 0px; padding-bottom: 15px; margin: 0px; padding-top: 0px; border-right-width: 0px"><font face="Verdana">隨著全球各國日益注重節(jié)能減排的要求， <a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/LED"><em>LED</em></a>作為新光源以其高效節(jié)能越來越得到廣泛的應(yīng)用。下面主要介紹關(guān)于小<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/功率"><em>功率</em></a>段1-30W之間的<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/LED"><em>LED</em></a><a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/驅(qū)動"><em>驅(qū)動</em></a>應(yīng)用非隔離技術(shù)方面的介紹。</font></p>本文引用地址：<a href="http://www.ex-cimer.com/article/175936.htm">http://www.ex-cimer.com/article/175936.htm</a><p style="border-top-width: 0px; padding-right: 0px; padding-left: 0px; border-left-width: 0px; border-bottom-width: 0px; padding-bottom: 15px; margin: 0px; padding-top: 0px; border-right-width: 0px"><font face="Verdana">　　<strong><font size="3">一阻容降壓：</font></strong></font></p><p style="border-top-width: 0px; padding-right: 0px; padding-left: 0px; border-left-width: 0px; border-bottom-width: 0px; padding-bottom: 15px; margin: 0px; padding-top: 0px; border-right-width: 0px"><font face="Verdana">　　1. 阻容降壓的原理和應(yīng)用：</font></p><p style="border-top-width: 0px; padding-right: 0px; padding-left: 0px; border-left-width: 0px; border-bottom-width: 0px; padding-bottom: 15px; margin: 0px; padding-top: 0px; border-right-width: 0px"><font face="Verdana">　　電容降壓實(shí)際上是利用容抗限流，而電容器實(shí)際上起到一個(gè)限制電流和動態(tài)分配電容器和負(fù)載兩端電壓的角色。</font></p><p style="border-top-width: 0px; padding-right: 0px; padding-left: 0px; border-left-width: 0px; border-bottom-width: 0px; padding-bottom: 15px; margin: 0px; padding-top: 0px; border-right-width: 0px"><font face="Verdana">　　2. 采用電容降壓時(shí)應(yīng)注意以下幾點(diǎn)：</font></p><p style="border-top-width: 0px; padding-right: 0px; padding-left: 0px; border-left-width: 0px; border-bottom-width: 0px; padding-bottom: 15px; margin: 0px; padding-top: 0px; border-right-width: 0px"><font face="Verdana">　　根據(jù)負(fù)載的電流大小和交流電的工作頻率選取適當(dāng)?shù)碾娙荩?而不是依據(jù)負(fù)載的電壓和<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/功率"><em>功率</em></a>，限流電容必須采用無極性電容，不能采用電解電容。而且電容的耐壓須在400V以上，最理想的電容為聚丙烯金屬薄膜電容。電容降壓不能用于大<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/功率"><em>功率</em></a>條件，一般用于5W以下小功率應(yīng)用場合，電容降壓不適合動態(tài)負(fù)載條件，電容降壓不適合容性和感性負(fù)載，在<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/LED"><em>LED</em></a>電源的<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/驅(qū)動"><em>驅(qū)動</em></a>方面應(yīng)用上適合單電壓應(yīng)用。</font></p><p style="border-top-width: 0px; padding-right: 0px; padding-left: 0px; border-left-width: 0px; border-bottom-width: 0px; padding-bottom: 15px; margin: 0px; padding-top: 0px; border-right-width: 0px"><font face="Verdana">　　3. 阻容降壓式簡易電源的基本電路如（圖1）</font></p><p align="center" style="border-top-width: 0px; padding-right: 0px; padding-left: 0px; border-left-width: 0px; border-bottom-width: 0px; padding-bottom: 15px; margin: 0px; padding-top: 0px; border-right-width: 0px"><img onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" alt="簡易電源的基本電路" src="http://editerupload.eepw.com.cn/fetch/20131009/175936_1_0.jpg" border="0" style="border-top-width: 0px; padding-right: 0px; display: block; padding-left: 0px; border-left-width: 0px; border-bottom-width: 0px; padding-bottom: 0px; margin: 20px auto; width: 420px; padding-top: 0px; height: 307px; border-right-width: 0px; max-width: 600px" /></p><p align="center" style="border-top-width: 0px; padding-right: 0px; padding-left: 0px; border-left-width: 0px; border-bottom-width: 0px; padding-bottom: 15px; margin: 0px; padding-top: 0px; border-right-width: 0px"><font face="Verdana">圖1.</font></p><p style="border-top-width: 0px; padding-right: 0px; padding-left: 0px; border-left-width: 0px; border-bottom-width: 0px; padding-bottom: 15px; margin: 0px; padding-top: 0px; border-right-width: 0px"><font face="Verdana">　　C1為降壓電容器， D1, 2, 3, 4為橋式整流二極管， ZD1是穩(wěn)壓二極管， R1為關(guān)斷電源后C1的電荷泄放電阻。</font></p><p style="border-top-width: 0px; padding-right: 0px; padding-left: 0px; border-left-width: 0px; border-bottom-width: 0px; padding-bottom: 15px; margin: 0px; padding-top: 0px; border-right-width: 0px"><font face="Verdana">　　4. 器件選擇</font></p><p style="border-top-width: 0px; padding-right: 0px; padding-left: 0px; border-left-width: 0px; border-bottom-width: 0px; padding-bottom: 15px; margin: 0px; padding-top: 0px; border-right-width: 0px"><font face="Verdana">　　電路設(shè)計(jì)時(shí)，應(yīng)先測定負(fù)載電流的準(zhǔn)確值，然后參考示例來選擇降壓電容器的容量。因?yàn)橥ㄟ^降壓電容C1向負(fù)載提供的電流Io, 實(shí)際上是流過C1的充放電電流Ic.C1容量越大，容抗Xc越小，則流經(jīng)C1的充、放電電流越大。當(dāng)負(fù)載電流Io小于C1的充放電電流時(shí)，多余的電流就會流過穩(wěn)壓管，若穩(wěn)壓管的最大允許電流Idmax小于Ic-Io時(shí)易造成穩(wěn)壓管燒毀。為保證C1可靠工作，其耐壓選擇應(yīng)大于兩倍的電源電壓。泄放電阻R1的選擇必須保證在規(guī)定的時(shí)間內(nèi)泄放掉C1上的電荷。</font></p><p style="border-top-width: 0px; padding-right: 0px; padding-left: 0px; border-left-width: 0px; border-bottom-width: 0px; padding-bottom: 15px; margin: 0px; padding-top: 0px; border-right-width: 0px"><font face="Verdana">　　5. 實(shí)際參數(shù)計(jì)算方法：</font></p><p style="border-top-width: 0px; padding-right: 0px; padding-left: 0px; border-left-width: 0px; border-bottom-width: 0px; padding-bottom: 15px; margin: 0px; padding-top: 0px; border-right-width: 0px"><font face="Verdana">　　已知C1為0.33μF, 交流輸入為220V/50Hz, 求電路能供給負(fù)載的最大電流。</font></p><p style="border-top-width: 0px; padding-right: 0px; padding-left: 0px; border-left-width: 0px; border-bottom-width: 0px; padding-bottom: 15px; margin: 0px; padding-top: 0px; border-right-width: 0px"><font face="Verdana">　　C1在電路中的容抗Xc為：</font></p><p style="border-top-width: 0px; padding-right: 0px; padding-left: 0px; border-left-width: 0px; border-bottom-width: 0px; padding-bottom: 15px; margin: 0px; padding-top: 0px; border-right-width: 0px"><font face="Verdana">　　Xc=1 /（2 πf C）= 1/（2*3.14*50*0.33*10-6）= 9.65K</font></p><p style="border-top-width: 0px; padding-right: 0px; padding-left: 0px; border-left-width: 0px; border-bottom-width: 0px; padding-bottom: 15px; margin: 0px; padding-top: 0px; border-right-width: 0px"><font face="Verdana">　　流過電容器C1的充電電流（Ic）為：</font></p><p style="border-top-width: 0px; padding-right: 0px; padding-left: 0px; border-left-width: 0px; border-bottom-width: 0px; padding-bottom: 15px; margin: 0px; padding-top: 0px; border-right-width: 0px"><font face="Verdana">　　Ic = U / Xc = 220 / 9.65 = 22mA.</font></p><p style="border-top-width: 0px; padding-right: 0px; padding-left: 0px; border-left-width: 0px; border-bottom-width: 0px; padding-bottom: 15px; margin: 0px; padding-top: 0px; border-right-width: 0px"><font face="Verdana">　　<strong><font size="3">二線性<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/驅(qū)動"><em>驅(qū)動</em></a>電路：</font></strong></font></p><p style="border-top-width: 0px; padding-right: 0px; padding-left: 0px; border-left-width: 0px; border-bottom-width: 0px; padding-bottom: 15px; margin: 0px; padding-top: 0px; border-right-width: 0px"><font face="Verdana">　　1. 典型的電路如（圖2）</font></p><p align="center" style="border-top-width: 0px; padding-right: 0px; padding-left: 0px; border-left-width: 0px; border-bottom-width: 0px; padding-bottom: 15px; margin: 0px; padding-top: 0px; border-right-width: 0px"><img onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" alt="典型的電路" src="http://editerupload.eepw.com.cn/fetch/20131009/175936_1_1.jpg" border="0" style="border-top-width: 0px; padding-right: 0px; display: block; padding-left: 0px; border-left-width: 0px; border-bottom-width: 0px; padding-bottom: 0px; margin: 20px auto; width: 497px; padding-top: 0px; height: 344px; border-right-width: 0px; max-width: 600px" /></p><p align="center" style="border-top-width: 0px; padding-right: 0px; padding-left: 0px; border-left-width: 0px; border-bottom-width: 0px; padding-bottom: 15px; margin: 0px; padding-top: 0px; border-right-width: 0px"><font face="Verdana">　　圖2</font></p><p style="border-top-width: 0px; padding-right: 0px; padding-left: 0px; border-left-width: 0px; border-bottom-width: 0px; padding-bottom: 15px; margin: 0px; padding-top: 0px; border-right-width: 0px"><font face="Verdana">　　2. 工作原理：</font></p><p style="border-top-width: 0px; padding-right: 0px; padding-left: 0px; border-left-width: 0px; border-bottom-width: 0px; padding-bottom: 15px; margin: 0px; padding-top: 0px; border-right-width: 0px"><font face="Verdana">　　R3為恒流電阻，利用R3的壓降來控制TL432的開關(guān)，在利用432的開關(guān)來控制Q1的導(dǎo)通從而達(dá)到輸出恒流的目的，選擇432的目的是利用432基準(zhǔn)為1.21V來降低在R3上的損耗。電流恒流值之為1.21/R3, R1選擇根據(jù)Q1的放大倍數(shù)來選取。</font></p><p style="border-top-width: 0px; padding-right: 0px; padding-left: 0px; border-left-width: 0px; border-bottom-width: 0px; padding-bottom: 15px; margin: 0px; padding-top: 0px; border-right-width: 0px"><font face="Verdana">　　3. 應(yīng)用場合注意事項(xiàng)：</font></p><p style="border-top-width: 0px; padding-right: 0px; padding-left: 0px; border-left-width: 0px; border-bottom-width: 0px; padding-bottom: 15px; margin: 0px; padding-top: 0px; border-right-width: 0px"><font face="Verdana">　　此電路建議應(yīng)用在單電壓輸入，輸出電流小電流的LED電源驅(qū)動上，比如球泡燈， T管等，一般建議輸出電流在100mA下。同時(shí)輸出電壓越接近輸入會比較好，這樣避免Q1的的壓降過大而造成損耗過大，效率較低，因此LED的使用也最好串聯(lián)使用。</font></p><p style="border-top-width: 0px; padding-right: 0px; padding-left: 0px; border-left-width: 0px; border-bottom-width: 0px; padding-bottom: 15px; margin: 0px; padding-top: 0px; border-right-width: 0px"><font face="Verdana">　　<strong><font size="3">三恒流二極管驅(qū)動電路</font></strong></font></p><p style="border-top-width: 0px; padding-right: 0px; padding-left: 0px; border-left-width: 0px; border-bottom-width: 0px; padding-bottom: 15px; margin: 0px; padding-top: 0px; border-right-width: 0px"><font face="Verdana">　　1. 典型的電路如（圖3, 圖4）</font></p><p align="center" style="border-top-width: 0px; padding-right: 0px; padding-left: 0px; border-left-width: 0px; border-bottom-width: 0px; padding-bottom: 15px; margin: 0px; padding-top: 0px; border-right-width: 0px"><img onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" alt="典型的電路" src="http://editerupload.eepw.com.cn/fetch/20131009/175936_1_2.jpg" border="0" style="border-top-width: 0px; padding-right: 0px; display: block; padding-left: 0px; border-left-width: 0px; border-bottom-width: 0px; padding-bottom: 0px; margin: 20px auto; width: 528px; padding-top: 0px; height: 332px; border-right-width: 0px; max-width: 600px" /></p><p align="center" style="border-top-width: 0px; padding-right: 0px; padding-left: 0px; border-left-width: 0px; border-bottom-width: 0px; padding-bottom: 15px; margin: 0px; padding-top: 0px; border-right-width: 0px"><font face="Verdana">　　圖3</font></p><p align="center" style="border-top-width: 0px; padding-right: 0px; padding-left: 0px; border-left-width: 0px; border-bottom-width: 0px; padding-bottom: 15px; margin: 0px; padding-top: 0px; border-right-width: 0px"><img onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" alt="典型的電路" src="http://editerupload.eepw.com.cn/fetch/20131009/175936_1_3.jpg" border="0" style="border-top-width: 0px; padding-right: 0px; display: block; padding-left: 0px; border-left-width: 0px; border-bottom-width: 0px; padding-bottom: 0px; margin: 20px auto; width: 458px; padding-top: 0px; height: 302px; border-right-width: 0px; max-width: 600px" /></p><p align="center" style="border-top-width: 0px; padding-right: 0px; padding-left: 0px; border-left-width: 0px; border-bottom-width: 0px; padding-bottom: 15px; margin: 0px; padding-top: 0px; border-right-width: 0px"><font face="Verdana">　　圖4</font></p><p style="border-top-width: 0px; padding-right: 0px; padding-left: 0px; border-left-width: 0px; border-bottom-width: 0px; padding-bottom: 15px; margin: 0px; padding-top: 0px; border-right-width: 0px"><font face="Verdana">　　2. 工作原理</font></p><p style="border-top-width: 0px; padding-right: 0px; padding-left: 0px; border-left-width: 0px; border-bottom-width: 0px; padding-bottom: 15px; margin: 0px; padding-top: 0px; border-right-width: 0px"><font face="Verdana">　　理想的恒流源是一種內(nèi)阻為無窮大的器件，不論其兩端電壓為何值，其流經(jīng)的電流永遠(yuǎn)不變。當(dāng)然這種器件是不可能存在的。實(shí)際的恒流二極管相當(dāng)于一個(gè)在一定工作電壓范圍內(nèi) 例如25-100V其電流恒定為某一值例如20mA.其等效電路如圖5所示</font></p><p align="center" style="border-top-width: 0px; padding-right: 0px; padding-left: 0px; border-left-width: 0px; border-bottom-width: 0px; padding-bottom: 15px; margin: 0px; padding-top: 0px; border-right-width: 0px"><img onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" alt="等效電路" src="http://editerupload.eepw.com.cn/fetch/20131009/175936_1_4.jpg" border="0" style="border-top-width: 0px; padding-right: 0px; display: block; padding-left: 0px; border-left-width: 0px; border-bottom-width: 0px; padding-bottom: 0px; margin: 20px auto; width: 510px; padding-top: 0px; height: 241px; border-right-width: 0px; max-width: 600px" /></p><p align="center" style="border-top-width: 0px; padding-right: 0px; padding-left: 0px; border-left-width: 0px; border-bottom-width: 0px; padding-bottom: 15px; margin: 0px; padding-top: 0px; border-right-width: 0px"><font face="Verdana">　　圖5</font></p><p align="center" style="border-top-width: 0px; padding-right: 0px; padding-left: 0px; border-left-width: 0px; border-bottom-width: 0px; padding-bottom: 15px; margin: 0px; padding-top: 0px; border-right-width: 0px"></p></span><span id="zzbpcum" class="Apple-style-span" style="word-spacing: 0px; font: 14px/30px 宋體; text-transform: none; color: rgb(17,17,17); text-indent: 0px; white-space: normal; letter-spacing: normal; background-color: rgb(255,255,255); text-align: left; webkit-text-size-adjust: auto; orphans: 2; widows: 2; webkit-text-decorations-in-effect: none; webkit-text-stroke-width: 0px"><p style="border-top-width: 0px; padding-right: 0px; padding-left: 0px; border-left-width: 0px; border-bottom-width: 0px; padding-bottom: 15px; margin: 0px; padding-top: 0px; border-right-width: 0px"><font face="Verdana">其內(nèi)阻為Z, 并聯(lián)的電容大約為4-10pF.其典型的伏安特性如圖六所示。</font></p><p align="center" style="border-top-width: 0px; padding-right: 0px; padding-left: 0px; border-left-width: 0px; border-bottom-width: 0px; padding-bottom: 15px; margin: 0px; padding-top: 0px; border-right-width: 0px"><img onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" alt="典型的伏安特性" src="http://editerupload.eepw.com.cn/fetch/20131009/175936_1_5.jpg" border="0" style="border-top-width: 0px; padding-right: 0px; display: block; padding-left: 0px; border-left-width: 0px; border-bottom-width: 0px; padding-bottom: 0px; margin: 20px auto; width: 450px; cursor: pointer; padding-top: 0px; border-right-width: 0px; max-width: 600px" /></p><p align="center" style="border-top-width: 0px; padding-right: 0px; padding-left: 0px; border-left-width: 0px; border-bottom-width: 0px; padding-bottom: 15px; margin: 0px; padding-top: 0px; border-right-width: 0px"><font face="Verdana">　　圖6</font></p><p style="border-top-width: 0px; padding-right: 0px; padding-left: 0px; border-left-width: 0px; border-bottom-width: 0px; padding-bottom: 15px; margin: 0px; padding-top: 0px; border-right-width: 0px"><font face="Verdana">　　它在某一個(gè)電壓范圍內(nèi)有一段恒流區(qū)間，在這個(gè)區(qū)間，流經(jīng)的電流幾乎不變， VL為到達(dá)IL的電壓值， IL大約為0.8Ip.</font></p><p style="border-top-width: 0px; padding-right: 0px; padding-left: 0px; border-left-width: 0px; border-bottom-width: 0px; padding-bottom: 15px; margin: 0px; padding-top: 0px; border-right-width: 0px"><font face="Verdana">　　3. 應(yīng)用注意事項(xiàng)</font></p><p style="border-top-width: 0px; padding-right: 0px; padding-left: 0px; border-left-width: 0px; border-bottom-width: 0px; padding-bottom: 15px; margin: 0px; padding-top: 0px; border-right-width: 0px"><font face="Verdana">　　由于恒流二極管需要一定的電壓Vk才能夠進(jìn)入恒流，所以太低的電源電壓是無法工作的。通常這個(gè)Vk大約在5-10V左右所以大多數(shù)采用電池供電的LED是無法工作的，最大電流由于恒流二極管的功耗受到限制，所以過大的電流也是不合適的。例如1W的LED通常需要350mA, 恒流二極管就很難提供，目前比較合適的使用場合就是交流市電供電的LED燈具采用很多小功率LED串聯(lián)也就是高壓小電流的情況是最為合適；但是由于恒流二極管的耐壓有一定的限制所以它所能吸收的電源電壓變化也是有限的。就拿100V耐壓的CRD來說用在220V市電電源里都還只能對付有限的電壓變化。220V經(jīng)過橋式整流以后它的輸出直流電壓大約為264V.如果市電變化+10% ~-15%就相當(dāng)于整流后為290~187V, 電壓變化103V.已經(jīng)超過其耐壓了。因?yàn)長ED伏安特性的非線性所以很難用公式來表示?？傊?dāng)市電電壓降低時(shí)LED中的電流就會隨市電電壓的降低而降低。其亮度也會跟著變。典型應(yīng)用電路中圖3為典型的應(yīng)用電路，圖4為加了阻容降壓的應(yīng)用電路為了應(yīng)對低電壓的輸出場合。</font></p><p style="border-top-width: 0px; padding-right: 0px; padding-left: 0px; border-left-width: 0px; border-bottom-width: 0px; padding-bottom: 15px; margin: 0px; padding-top: 0px; border-right-width: 0px"><font face="Verdana">　　<strong><font size="3">四采用單極PFC的Buck電路</font></strong></font></p><p style="border-top-width: 0px; padding-right: 0px; padding-left: 0px; border-left-width: 0px; border-bottom-width: 0px; padding-bottom: 15px; margin: 0px; padding-top: 0px; border-right-width: 0px"><font face="Verdana">　　隨著目前法規(guī)和能效的需求，針對LED應(yīng)用提出高PF以及適應(yīng)全電壓范圍都能可靠工作的要求，并且朝小型化方面發(fā)展，因此之前的填谷式的PFC電路也需要增加兩個(gè)高壓電容因體積的限制不太適合應(yīng)用。有鑒如此，國內(nèi)外很多廠商都推出了適應(yīng)球泡燈和T管之類的非隔離電源應(yīng)用驅(qū)動<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/方案"><em>方案</em></a>，下面就以通嘉科技的LD7832做為典型介紹。</font></p><p style="border-top-width: 0px; padding-right: 0px; padding-left: 0px; border-left-width: 0px; border-bottom-width: 0px; padding-bottom: 15px; margin: 0px; padding-top: 0px; border-right-width: 0px"><font face="Verdana">　　1. LD7832介紹</font></p><p style="border-top-width: 0px; padding-right: 0px; padding-left: 0px; border-left-width: 0px; border-bottom-width: 0px; padding-bottom: 15px; margin: 0px; padding-top: 0px; border-right-width: 0px"><font face="Verdana">　　LD7832是一款應(yīng)用在Buck電路中采用TM模式控制的高PF值LED驅(qū)動控制芯片，應(yīng)用外圍元件少最大限度的減少了PCB尺寸，保護(hù)功能齊全，滿足各項(xiàng)功能測試和可靠性應(yīng)用測試的要求，設(shè)計(jì)調(diào)試相當(dāng)簡單，最大限度的滿足客戶要求快速設(shè)計(jì)上線量產(chǎn)并滿足法規(guī)的需求，適合在30W以下球泡燈， T管等產(chǎn)品應(yīng)用，為了適應(yīng)不同需要， LD7832有外置MOS和內(nèi)置MOS（2A）不同的版本供選擇。</font></p><p style="border-top-width: 0px; padding-right: 0px; padding-left: 0px; border-left-width: 0px; border-bottom-width: 0px; padding-bottom: 15px; margin: 0px; padding-top: 0px; border-right-width: 0px"><font face="Verdana">　　2. 特點(diǎn) 內(nèi)置600V高壓啟動電路</font></p><p style="border-top-width: 0px; padding-right: 0px; padding-left: 0px; border-left-width: 0px; border-bottom-width: 0px; padding-bottom: 15px; margin: 0px; padding-top: 0px; border-right-width: 0px"><font face="Verdana">　　高PFC功能控制器</font></p><p style="border-top-width: 0px; padding-right: 0px; padding-left: 0px; border-left-width: 0px; border-bottom-width: 0px; padding-bottom: 15px; margin: 0px; padding-top: 0px; border-right-width: 0px"><font face="Verdana">　　高效過渡模式控制</font></p><p style="border-top-width: 0px; padding-right: 0px; padding-left: 0px; border-left-width: 0px; border-bottom-width: 0px; padding-bottom: 15px; margin: 0px; padding-top: 0px; border-right-width: 0px"><font face="Verdana">　　低成本設(shè)計(jì)應(yīng)用外圍零件最少</font></p><p style="border-top-width: 0px; padding-right: 0px; padding-left: 0px; border-left-width: 0px; border-bottom-width: 0px; padding-bottom: 15px; margin: 0px; padding-top: 0px; border-right-width: 0px"><font face="Verdana">　　電流調(diào)整精度高</font></p><p style="border-top-width: 0px; padding-right: 0px; padding-left: 0px; border-left-width: 0px; border-bottom-width: 0px; padding-bottom: 15px; margin: 0px; padding-top: 0px; border-right-width: 0px"><font face="Verdana">　　寬范圍 UVLO （17V開， 8V 關(guān)）</font></p><p style="border-top-width: 0px; padding-right: 0px; padding-left: 0px; border-left-width: 0px; border-bottom-width: 0px; padding-bottom: 15px; margin: 0px; padding-top: 0px; border-right-width: 0px"><font face="Verdana">　　Vcc 過電壓保護(hù)功能</font></p><p style="border-top-width: 0px; padding-right: 0px; padding-left: 0px; border-left-width: 0px; border-bottom-width: 0px; padding-bottom: 15px; margin: 0px; padding-top: 0px; border-right-width: 0px"><font face="Verdana">　　ZCD欠壓保護(hù)功能</font></p><p style="border-top-width: 0px; padding-right: 0px; padding-left: 0px; border-left-width: 0px; border-bottom-width: 0px; padding-bottom: 15px; margin: 0px; padding-top: 0px; border-right-width: 0px"><font face="Verdana">　　Cs短路保護(hù)功能</font></p><p style="border-top-width: 0px; padding-right: 0px; padding-left: 0px; border-left-width: 0px; border-bottom-width: 0px; padding-bottom: 15px; margin: 0px; padding-top: 0px; border-right-width: 0px"><font face="Verdana">　　環(huán)路開路保護(hù)功能</font></p><p style="border-top-width: 0px; padding-right: 0px; padding-left: 0px; border-left-width: 0px; border-bottom-width: 0px; padding-bottom: 15px; margin: 0px; padding-top: 0px; border-right-width: 0px"><font face="Verdana">　　IC內(nèi)部OTP保護(hù)功能（針對集成MOS IC）</font></p><p style="border-top-width: 0px; padding-right: 0px; padding-left: 0px; border-left-width: 0px; border-bottom-width: 0px; padding-bottom: 15px; margin: 0px; padding-top: 0px; border-right-width: 0px"><font face="Verdana">　　250mA/-500mA驅(qū)動能力</font></p><p style="border-top-width: 0px; padding-right: 0px; padding-left: 0px; border-left-width: 0px; border-bottom-width: 0px; padding-bottom: 15px; margin: 0px; padding-top: 0px; border-right-width: 0px"><font face="Verdana">　　3. 工作原理</font></p><p style="border-top-width: 0px; padding-right: 0px; padding-left: 0px; border-left-width: 0px; border-bottom-width: 0px; padding-bottom: 15px; margin: 0px; padding-top: 0px; border-right-width: 0px"><font face="Verdana">　　LD7832是采用電壓模式控制在邊界條件下工作的固定開通時(shí)間的PFC控制器，利用IC的Comp電壓和IC內(nèi)部的Ramp信號做比較來決定MOS的開通時(shí)間。工作原理波形如下圖7.</span>  <div class="hsudjid" id="coverDiv" class="article_reg" style="width:100%;overflow:hidden;display:none;z-index:10;position:absolute;left:0;background:#fff;"> <center> <img src="https://webstorage.eepw.com.cn/images/display/reg.jpg" border="0" usemap="#Map" /> <map name="Map" id="Map"> <area shape="rect" coords="133,235,319,253" target="_blank" /> <area shape="rect" coords="132,315,319,335" /> </map> </center> </div>  <span id="iopcazm" class="hAd8"> <br></span>  <div id="alzurxh" class="quotes"> <span id="fthcisb" class="pre">上一頁</span> <span id="snlnzmg" class="current">1</span> <a href="175936_2.htm">2</a> <a href="175936_2.htm">下一頁</a> </div>  </div> </article> <div id="rfwcflk" class="clear"></div> <br/> <div id="szwclsg" class="hAd6"> <div class="drtsfld" id="relA" style="width:auto;height:auto;"> <ul> <li>  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