3. 快速(su)瞬態應(ying)用(yong)(yong)。線(xian)性穩(wen)壓(ya)(ya)器(qi)反(fan)饋環(huan)路一般都是內置的(de)，因此(ci)無需外(wai)部(bu)補償。相比于(yu)SMPS，線(xian)性穩(wen)壓(ya)(ya)器(qi)通常(chang)具有(you)(you)較寬的(de)控制(zhi)環(huan)路帶寬和較快的(de)瞬態響應(ying)。4. 低(di)壓(ya)(ya)差應(ying)用(yong)(yong)。對于(yu)那些輸(shu)出電(dian)(dian)壓(ya)(ya)接近(jin)(jin)輸(shu)入電(dian)(dian)壓(ya)(ya)的(de)應(ying)用(yong)(yong)來(lai)(lai)說，LDO可能比SMPS更有(you)(you)效(xiao)。有(you)(you)非常(chang)低(di)壓(ya)(ya)差LDO（VLDO），例(li)如：凌力爾特的(de)LTC1844、 LT3020和LTC3025，這些器(qi)件可提(ti)(ti)供(gong)20mV至(zhi)90mV的(de)壓(ya)(ya)差電(dian)(dian)壓(ya)(ya)和高達150mA的(de)電(dian)(dian)流。較小輸(shu)入電(dian)(dian)壓(ya)(ya)可低(di)至(zhi)0.9V.由于(yu)LR中沒有(you)(you)AC開關(guan)(guan)損耗(hao)(hao)，因此(ci)LR或LDO的(de)輕(qing)負(fu)載(zai)效(xiao)率(lv)與其滿負(fu)載(zai)效(xiao)率(lv)很(hen)相近(jin)(jin)。SMPS常(chang)常(chang)因其AC開關(guan)(guan)損耗(hao)(hao)的(de)緣故而(er)具有(you)(you)較低(di)的(de)輕(qing)負(fu)載(zai)效(xiao)率(lv)。在輕(qing)負(fu)載(zai)效(xiao)率(lv)同樣(yang)十分關(guan)(guan)鍵(jian)的(de)電(dian)(dian)池供(gong)電(dian)(dian)型應(ying)用(yong)(yong)中，LDO可提(ti)(ti)供(gong)一種(zhong)優(you)于(yu)SMPS的(de)解決方案(an)。凱(kai)軒業電(dian)(dian)子廠家直銷，價格優(you)勢(shi)，專業設計(ji)，深圳市凱(kai)軒業電(dian)(dian)子科技有(you)(you)限公司，歡迎(ying)來(lai)(lai)電(dian)(dian)。山西轉換器(qi)平臺

線(xian)性穩壓(ya)器(qi)(qi)(qi)(qi)的(de)(de)(de)(de)(de)(de)(de)優勢分(fen)析除了(le)(le)簡單易用之外，線(xian)性穩壓(ya)器(qi)(qi)(qi)(qi)還擁有(you)其他(ta)的(de)(de)(de)(de)(de)(de)(de)性能優勢。電(dian)源管理供應(ying)商開發了(le)(le)許(xu)多集(ji)成(cheng)(cheng)型(xing)線(xian)性穩壓(ya)器(qi)(qi)(qi)(qi)。典型(xing)的(de)(de)(de)(de)(de)(de)(de)集(ji)成(cheng)(cheng)線(xian)性穩壓(ya)器(qi)(qi)(qi)(qi)只需要VIN、VOUT、 FB和(he)任選(xuan)的(de)(de)(de)(de)(de)(de)(de)GND引(yin)腳(jiao)。圖4示出(chu)(chu)了(le)(le)一款典型(xing)的(de)(de)(de)(de)(de)(de)(de)3引(yin)腳(jiao)線(xian)性穩壓(ya)器(qi)(qi)(qi)(qi)LT1083，它是凌力(li)爾特公司(si)(si)在20多年前開發的(de)(de)(de)(de)(de)(de)(de)。該器(qi)(qi)(qi)(qi)件但需一個輸入電(dian)容器(qi)(qi)(qi)(qi)、輸出(chu)(chu)電(dian)容器(qi)(qi)(qi)(qi)和(he)兩個反饋電(dian)阻器(qi)(qi)(qi)(qi)以設定輸出(chu)(chu)電(dian)壓(ya)。幾(ji)乎(hu)所有(you)的(de)(de)(de)(de)(de)(de)(de)電(dian)氣工程(cheng)師都可以運用這些簡單的(de)(de)(de)(de)(de)(de)(de)線(xian)性穩壓(ya)器(qi)(qi)(qi)(qi)來設計電(dian)源。深(shen)圳市(shi)(shi)凱(kai)軒(xuan)業科技(ji)有(you)限公司(si)(si)在同行業領域中(zhong)(zhong)，一直處在一個不(bu)斷銳意(yi)進取，不(bu)斷制造創新的(de)(de)(de)(de)(de)(de)(de)市(shi)(shi)場(chang)高度，多年以來致力(li)于發展(zhan)富有(you)創新價值理念的(de)(de)(de)(de)(de)(de)(de)產品(pin)標準，在廣東省(sheng)等地區的(de)(de)(de)(de)(de)(de)(de)電(dian)子(zi)元器(qi)(qi)(qi)(qi)件中(zhong)(zhong)始終保持良(liang)好(hao)的(de)(de)(de)(de)(de)(de)(de)商業口碑，成(cheng)(cheng)績(ji)讓(rang)我(wo)(wo)們(men)喜悅(yue)，但不(bu)會讓(rang)我(wo)(wo)們(men)止步，殘酷(ku)的(de)(de)(de)(de)(de)(de)(de)市(shi)(shi)場(chang)磨煉了(le)(le)我(wo)(wo)們(men)堅強(qiang)不(bu)屈的(de)(de)(de)(de)(de)(de)(de)意(yi)志。歡迎咨詢黑(hei)龍(long)江(jiang)優勢轉換器(qi)(qi)(qi)(qi)轉換器(qi)(qi)(qi)(qi)就(jiu)選(xuan)凱(kai)軒(xuan)業科技(ji)，有(you)想(xiang)法可以來我(wo)(wo)司(si)(si)咨詢！

NPN旁路(lu)(lu)晶體(ti)管(guan)(guan)穩(wen)壓(ya)(ya)器(qi)(qi)(qi)是一種不(bu)錯的選(xuan)擇，對于(yu)嵌入(ru)式應用而(er)言，因(yin)(yin)(yin)為它(ta)壓(ya)(ya)差(cha)小(xiao)，容(rong)易使用。不(bu)過這(zhe)(zhe)種穩(wen)壓(ya)(ya)器(qi)(qi)(qi)仍不(bu)適合具有很低壓(ya)(ya)差(cha)要求的電(dian)(dian)池(chi)供(gong)電(dian)(dian)設(she)備使用，因(yin)(yin)(yin)為它(ta)壓(ya)(ya)差(cha)不(bu)夠(gou)低。高(gao)(gao)增益(yi)NPN旁路(lu)(lu)管(guan)(guan)可使接(jie)地電(dian)(dian)流(liu)穩(wen)定(ding)在幾個(ge)毫安，而(er)且它(ta)公共發(fa)(fa)射極(ji)結構具有很低的輸出(chu)阻抗。其(qi)中的旁路(lu)(lu)元件就是PNP晶體(ti)管(guan)(guan)。輸入(ru)輸出(chu)壓(ya)(ya)差(cha)一般在0.30.7V之間。因(yin)(yin)(yin)為壓(ya)(ya)差(cha)低，PNP旁路(lu)(lu)晶體(ti)管(guan)(guan)是一種低壓(ya)(ya)差(cha)穩(wen)壓(ya)(ya)器(qi)(qi)(qi)。因(yin)(yin)(yin)此這(zhe)(zhe)種PNP旁路(lu)(lu)晶體(ti)管(guan)(guan)穩(wen)壓(ya)(ya)器(qi)(qi)(qi)非常適合電(dian)(dian)池(chi)供(gong)電(dian)(dian)的嵌入(ru)式設(she)備使用。不(bu)過它(ta)大接(jie)地電(dian)(dian)流(liu)會縮(suo)短電(dian)(dian)池(chi)的壽另外，PNP晶體(ti)管(guan)(guan)增益(yi)較低，會形成數毫安的不(bu)穩(wen)定(ding)接(jie)地電(dian)(dian)流(liu)。因(yin)(yin)(yin)為采用公共發(fa)(fa)射極(ji)結構，因(yin)(yin)(yin)此它(ta)輸出(chu)阻抗比較高(gao)(gao)，這(zhe)(zhe)意味著需(xu)要外接(jie)特定(ding)范圍容(rong)量(liang)和等(deng)效串聯電(dian)(dian)阻（ESR電(dian)(dian)容(rong)才干(gan)夠(gou)穩(wen)定(ding)工作。

線性穩壓(ya)器(qi)的(de)(de)(de)(de)(de)突出(chu)優點(dian)是具有的(de)(de)(de)(de)(de)成本(ben)，的(de)(de)(de)(de)(de)噪聲(sheng)和(he)的(de)(de)(de)(de)(de)靜態(tai)電(dian)流(liu)(liu)。它的(de)(de)(de)(de)(de)外面器(qi)件也很(hen)少，通(tong)常只有一(yi)兩個(ge)旁(pang)路電(dian)容。新型線性穩壓(ya)器(qi)可達到以(yi)(yi)下(xia)指標：30μV 輸(shu)(shu)出(chu)噪聲(sheng)、60dB PSRR、6μA 靜態(tai)電(dian)流(liu)(liu)及100mV的(de)(de)(de)(de)(de)壓(ya)差(cha)。線性穩壓(ya)器(qi)能夠實現這些特(te)(te)性的(de)(de)(de)(de)(de)主要原因在(zai)于內部調整管(guan)采用了P溝道(dao)場(chang)(chang)效應(ying)管(guan)，而不是通(tong)常線性穩壓(ya)器(qi)中(zhong)的(de)(de)(de)(de)(de)PNP晶體管(guan)。P溝道(dao)的(de)(de)(de)(de)(de)場(chang)(chang)效應(ying)管(guan)不需要基極電(dian)流(liu)(liu)驅動，所以(yi)(yi)較大降低了器(qi)件本(ben)身的(de)(de)(de)(de)(de)電(dian)源(yuan)電(dian)流(liu)(liu)；另一(yi)方面，在(zai)采用PNP管(guan)的(de)(de)(de)(de)(de)結構中(zhong)，為(wei)了防止PNP晶體管(guan)進入(ru)飽和(he)狀態(tai)降低輸(shu)(shu)出(chu)能力，必須保證較大的(de)(de)(de)(de)(de)輸(shu)(shu)入(ru)輸(shu)(shu)出(chu)壓(ya)差(cha)；線性穩壓(ya)直流(liu)(liu)電(dian)源(yuan)的(de)(de)(de)(de)(de)特(te)(te)點(dian)是：輸(shu)(shu)出(chu)電(dian)壓(ya)比(bi)輸(shu)(shu)入(ru)電(dian)壓(ya)低；反(fan)應(ying)速度快，輸(shu)(shu)出(chu)紋波(bo)較小，凱(kai)軒業電(dian)子。

便攜(xie)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)子(zi)(zi)設(she)備(bei)(bei)不管是由(you)交流市電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)經過整流(或交流適配器(qi)(qi))后供電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)，還是由(you)蓄電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)池組供電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)，工作(zuo)過程中，電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)都(dou)將(jiang)在很大范圍內變(bian)(bian)化(hua)(hua)。比如單(dan)體鋰離子(zi)(zi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)池充足電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)時的(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)為(wei)4.2V，放完(wan)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)后的(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)為(wei)2.3V，變(bian)(bian)化(hua)(hua)范圍很大。各種整流器(qi)(qi)的(de)(de)(de)輸(shu)出電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)不但受市電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)變(bian)(bian)化(hua)(hua)的(de)(de)(de)影響，還受負載變(bian)(bian)化(hua)(hua)的(de)(de)(de)影響。為(wei)了(le)保證(zheng)供電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)穩定不變(bian)(bian)，幾乎所有(you)的(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)子(zi)(zi)設(she)備(bei)(bei)都(dou)采用穩壓(ya)(ya)器(qi)(qi)供電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)。小型精密(mi)(mi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)子(zi)(zi)設(she)備(bei)(bei)還要(yao)求電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源非(fei)常干凈（無(wu)紋波(bo)、無(wu)噪聲(sheng)），以(yi)免影響電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)子(zi)(zi)設(she)備(bei)(bei)正常工作(zuo)。為(wei)了(le)滿足精密(mi)(mi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)子(zi)(zi)設(she)備(bei)(bei)的(de)(de)(de)要(yao)求，應在電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源的(de)(de)(de)輸(shu)入端加入線性穩壓(ya)(ya)器(qi)(qi)，以(yi)保證(zheng)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)恒定和實(shi)現(xian)有(you)源噪聲(sheng)濾波(bo)。專業(ye)轉(zhuan)換(huan)(huan)器(qi)(qi)設(she)計研發，深圳凱軒業(ye)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)子(zi)(zi)有(you)限(xian)公司，竭誠為(wei)您服務。山西轉(zhuan)換(huan)(huan)器(qi)(qi)平臺

線(xian)性(xing)穩(wen)(wen)壓電源，是指調整管工作在線(xian)性(xing)狀(zhuang)態下的(de)直流穩(wen)(wen)壓電源。選(xuan)深圳市凱軒業電子。山(shan)西(xi)轉換器平臺(tai)

線(xian)性穩(wen)(wen)(wen)壓(ya)(ya)器(qi)(qi)的(de)(de)(de)應用(yong)(yong)(yong)線(xian)性穩(wen)(wen)(wen)壓(ya)(ya)器(qi)(qi)的(de)(de)(de)主要應用(yong)(yong)(yong)體現(xian)在以下(xia)幾個(ge)方(fang)面：1. 簡(jian)(jian)單(dan)/低(di)成本的(de)(de)(de)解決方(fang)案(an)。線(xian)性穩(wen)(wen)(wen)壓(ya)(ya)器(qi)(qi)和(he)LDO簡(jian)(jian)單(dan)易(yi)用(yong)(yong)(yong)，特別(bie)適合于那些(xie)具有(you)(you)低(di)輸出(chu)電(dian)(dian)流、熱應力不(bu)很(hen)關鍵的(de)(de)(de)低(di)功率(lv)應用(yong)(yong)(yong)。無需外(wai)部(bu)功率(lv)電(dian)(dian)感(gan)器(qi)(qi)。2. 低(di)噪聲/低(di)紋波應用(yong)(yong)(yong)。對于那些(xie)對噪聲敏(min)感(gan)的(de)(de)(de)應用(yong)(yong)(yong)（例(li)如：通(tong)信和(he)無線(xian)電(dian)(dian)設備）而(er)言，較大限度地抑(yi)制電(dian)(dian)源噪聲是(shi)非(fei)常(chang)關鍵的(de)(de)(de)。線(xian)性穩(wen)(wen)(wen)壓(ya)(ya)器(qi)(qi)具有(you)(you)非(fei)常(chang)低(di)的(de)(de)(de)輸出(chu)電(dian)(dian)壓(ya)(ya)紋波（因為(wei)沒有(you)(you)頻繁接通(tong)和(he)關斷的(de)(de)(de)組件(jian)），而(er)且線(xian)性穩(wen)(wen)(wen)壓(ya)(ya)器(qi)(qi)還可以擁有(you)(you)非(fei)常(chang)高的(de)(de)(de)帶寬。所(suo)以，幾乎(hu)不(bu)存(cun)在EMI問題。有(you)(you)些(xie)特殊(shu)的(de)(de)(de)LDO（比如：凌力爾特的(de)(de)(de) LT1761 LDO系(xi)列）在輸出(chu)端的(de)(de)(de)噪聲電(dian)(dian)壓(ya)(ya)低(di)至(zhi)20μVRMS.這么低(di)的(de)(de)(de)噪聲水平(ping)SMPS幾乎(hu)是(shi)不(bu)可能(neng)實現(xian)的(de)(de)(de)。即使采用(yong)(yong)(yong)ESR非(fei)常(chang)低(di)的(de)(de)(de)電(dian)(dian)容器(qi)(qi)，SMPS的(de)(de)(de)輸出(chu)紋波往(wang)(wang)往(wang)(wang)也(ye)將達到mV級(ji)。山西(xi)轉換器(qi)(qi)平(ping)臺

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