3. 快速瞬(shun)態應(ying)(ying)用。線(xian)性(xing)穩壓(ya)器(qi)反(fan)饋環路(lu)一般都是內(nei)置的(de)(de)(de)，因(yin)此無需外部補償。相(xiang)比于SMPS，線(xian)性(xing)穩壓(ya)器(qi)通常具有(you)較(jiao)寬(kuan)(kuan)的(de)(de)(de)控制環路(lu)帶寬(kuan)(kuan)和較(jiao)快的(de)(de)(de)瞬(shun)態響應(ying)(ying)。4. 低(di)(di)(di)壓(ya)差應(ying)(ying)用。對(dui)于那些輸出(chu)電(dian)(dian)壓(ya)接近輸入(ru)電(dian)(dian)壓(ya)的(de)(de)(de)應(ying)(ying)用來說，LDO可(ke)(ke)能比SMPS更有(you)效(xiao)。有(you)非常低(di)(di)(di)壓(ya)差LDO（VLDO），例(li)如：凌力(li)爾特的(de)(de)(de)LTC1844、 LT3020和LTC3025，這些器(qi)件可(ke)(ke)提(ti)供(gong)20mV至90mV的(de)(de)(de)壓(ya)差電(dian)(dian)壓(ya)和高達150mA的(de)(de)(de)電(dian)(dian)流。較(jiao)小輸入(ru)電(dian)(dian)壓(ya)可(ke)(ke)低(di)(di)(di)至0.9V.由于LR中沒(mei)有(you)AC開關損耗，因(yin)此LR或(huo)LDO的(de)(de)(de)輕(qing)負(fu)(fu)載(zai)效(xiao)率與(yu)其(qi)滿(man)負(fu)(fu)載(zai)效(xiao)率很(hen)相(xiang)近。SMPS常常因(yin)其(qi)AC開關損耗的(de)(de)(de)緣故而(er)具有(you)較(jiao)低(di)(di)(di)的(de)(de)(de)輕(qing)負(fu)(fu)載(zai)效(xiao)率。在(zai)輕(qing)負(fu)(fu)載(zai)效(xiao)率同(tong)樣十分(fen)關鍵的(de)(de)(de)電(dian)(dian)池供(gong)電(dian)(dian)型應(ying)(ying)用中，LDO可(ke)(ke)提(ti)供(gong)一種(zhong)優于SMPS的(de)(de)(de)解決方案。凱軒(xuan)業(ye)電(dian)(dian)子(zi)(zi)廠家(jia)直銷(xiao)，價格(ge)優勢，專業(ye)設計，深圳市凱軒(xuan)業(ye)電(dian)(dian)子(zi)(zi)科(ke)技有(you)限公司(si)，歡迎來電(dian)(dian)。山西轉換(huan)器(qi)平臺(tai)

線性(xing)穩(wen)(wen)壓(ya)(ya)(ya)器(qi)(qi)(qi)的(de)(de)優(you)勢(shi)分析(xi)除(chu)了簡單易用之外，線性(xing)穩(wen)(wen)壓(ya)(ya)(ya)器(qi)(qi)(qi)還擁有(you)(you)其他的(de)(de)性(xing)能(neng)優(you)勢(shi)。電源管理(li)供(gong)應商(shang)開發(fa)(fa)了許(xu)多集成(cheng)型線性(xing)穩(wen)(wen)壓(ya)(ya)(ya)器(qi)(qi)(qi)。典型的(de)(de)集成(cheng)線性(xing)穩(wen)(wen)壓(ya)(ya)(ya)器(qi)(qi)(qi)只需要(yao)VIN、VOUT、 FB和(he)任選(xuan)的(de)(de)GND引(yin)腳。圖4示出(chu)(chu)(chu)了一(yi)(yi)(yi)款典型的(de)(de)3引(yin)腳線性(xing)穩(wen)(wen)壓(ya)(ya)(ya)器(qi)(qi)(qi)LT1083，它是凌力爾特公司(si)在20多年(nian)(nian)前(qian)開發(fa)(fa)的(de)(de)。該器(qi)(qi)(qi)件但需一(yi)(yi)(yi)個輸入(ru)電容器(qi)(qi)(qi)、輸出(chu)(chu)(chu)電容器(qi)(qi)(qi)和(he)兩個反(fan)饋(kui)電阻器(qi)(qi)(qi)以設(she)(she)定輸出(chu)(chu)(chu)電壓(ya)(ya)(ya)。幾乎所有(you)(you)的(de)(de)電氣(qi)工(gong)程(cheng)師都可(ke)以運用這些簡單的(de)(de)線性(xing)穩(wen)(wen)壓(ya)(ya)(ya)器(qi)(qi)(qi)來(lai)設(she)(she)計(ji)電源。深(shen)圳(zhen)市(shi)凱(kai)軒業(ye)(ye)科(ke)技(ji)有(you)(you)限(xian)公司(si)在同行業(ye)(ye)領(ling)域中，一(yi)(yi)(yi)直處(chu)在一(yi)(yi)(yi)個不(bu)(bu)(bu)斷銳意進取，不(bu)(bu)(bu)斷制造創新(xin)的(de)(de)市(shi)場高度，多年(nian)(nian)以來(lai)致力于(yu)發(fa)(fa)展富有(you)(you)創新(xin)價(jia)值(zhi)理(li)念的(de)(de)產品標準，在廣(guang)東省等地區的(de)(de)電子(zi)元器(qi)(qi)(qi)件中始終保持良好(hao)的(de)(de)商(shang)業(ye)(ye)口碑，成(cheng)績讓(rang)我(wo)們喜悅，但不(bu)(bu)(bu)會讓(rang)我(wo)們止步，殘酷的(de)(de)市(shi)場磨煉了我(wo)們堅強不(bu)(bu)(bu)屈的(de)(de)意志。歡(huan)迎咨詢黑龍(long)江優(you)勢(shi)轉換器(qi)(qi)(qi)轉換器(qi)(qi)(qi)就選(xuan)凱(kai)軒業(ye)(ye)科(ke)技(ji)，有(you)(you)想法(fa)可(ke)以來(lai)我(wo)司(si)咨詢！

NPN旁路(lu)晶(jing)體(ti)管(guan)穩(wen)壓(ya)(ya)器(qi)(qi)是(shi)(shi)一(yi)種不錯的選擇，對于嵌入式(shi)應用(yong)而(er)言，因(yin)(yin)為(wei)它(ta)(ta)壓(ya)(ya)差(cha)(cha)小，容(rong)(rong)易使(shi)用(yong)。不過這種穩(wen)壓(ya)(ya)器(qi)(qi)仍不適合(he)具有很低壓(ya)(ya)差(cha)(cha)要求(qiu)的電(dian)(dian)(dian)(dian)池(chi)供電(dian)(dian)(dian)(dian)設(she)(she)備(bei)使(shi)用(yong)，因(yin)(yin)為(wei)它(ta)(ta)壓(ya)(ya)差(cha)(cha)不夠(gou)低。高增(zeng)益NPN旁路(lu)管(guan)可使(shi)接地電(dian)(dian)(dian)(dian)流(liu)穩(wen)定(ding)在(zai)幾個毫(hao)安(an)，而(er)且(qie)它(ta)(ta)公共發(fa)射極結(jie)構具有很低的輸(shu)出阻(zu)抗。其(qi)中的旁路(lu)元件就是(shi)(shi)PNP晶(jing)體(ti)管(guan)。輸(shu)入輸(shu)出壓(ya)(ya)差(cha)(cha)一(yi)般在(zai)0.30.7V之(zhi)間。因(yin)(yin)為(wei)壓(ya)(ya)差(cha)(cha)低，PNP旁路(lu)晶(jing)體(ti)管(guan)是(shi)(shi)一(yi)種低壓(ya)(ya)差(cha)(cha)穩(wen)壓(ya)(ya)器(qi)(qi)。因(yin)(yin)此這種PNP旁路(lu)晶(jing)體(ti)管(guan)穩(wen)壓(ya)(ya)器(qi)(qi)非常適合(he)電(dian)(dian)(dian)(dian)池(chi)供電(dian)(dian)(dian)(dian)的嵌入式(shi)設(she)(she)備(bei)使(shi)用(yong)。不過它(ta)(ta)大(da)接地電(dian)(dian)(dian)(dian)流(liu)會縮短電(dian)(dian)(dian)(dian)池(chi)的壽另(ling)外(wai)，PNP晶(jing)體(ti)管(guan)增(zeng)益較(jiao)低，會形成數毫(hao)安(an)的不穩(wen)定(ding)接地電(dian)(dian)(dian)(dian)流(liu)。因(yin)(yin)為(wei)采用(yong)公共發(fa)射極結(jie)構，因(yin)(yin)此它(ta)(ta)輸(shu)出阻(zu)抗比較(jiao)高，這意味著需要外(wai)接特定(ding)范圍容(rong)(rong)量(liang)和等(deng)效串聯(lian)電(dian)(dian)(dian)(dian)阻(zu)（ESR電(dian)(dian)(dian)(dian)容(rong)(rong)才干夠(gou)穩(wen)定(ding)工作。

線性(xing)穩壓(ya)器(qi)(qi)的(de)(de)突出優(you)點(dian)是(shi)具有的(de)(de)成本，的(de)(de)噪(zao)聲和(he)(he)的(de)(de)靜態電(dian)(dian)(dian)流(liu)。它的(de)(de)外面器(qi)(qi)件也(ye)很少，通(tong)(tong)常只有一(yi)兩個旁路(lu)電(dian)(dian)(dian)容。新型(xing)線性(xing)穩壓(ya)器(qi)(qi)可達(da)到以(yi)(yi)下(xia)指標(biao)：30μV 輸(shu)出噪(zao)聲、60dB PSRR、6μA 靜態電(dian)(dian)(dian)流(liu)及100mV的(de)(de)壓(ya)差。線性(xing)穩壓(ya)器(qi)(qi)能夠實(shi)現(xian)這些特性(xing)的(de)(de)主要(yao)原因在(zai)于內部調整管(guan)(guan)采(cai)用了P溝道(dao)場效(xiao)(xiao)應管(guan)(guan)，而不是(shi)通(tong)(tong)常線性(xing)穩壓(ya)器(qi)(qi)中(zhong)的(de)(de)PNP晶體管(guan)(guan)。P溝道(dao)的(de)(de)場效(xiao)(xiao)應管(guan)(guan)不需要(yao)基極電(dian)(dian)(dian)流(liu)驅(qu)動(dong)，所(suo)以(yi)(yi)較大降低了器(qi)(qi)件本身的(de)(de)電(dian)(dian)(dian)源電(dian)(dian)(dian)流(liu)；另一(yi)方面，在(zai)采(cai)用PNP管(guan)(guan)的(de)(de)結構中(zhong)，為(wei)了防(fang)止PNP晶體管(guan)(guan)進入飽(bao)和(he)(he)狀態降低輸(shu)出能力(li)，必須保證較大的(de)(de)輸(shu)入輸(shu)出壓(ya)差；線性(xing)穩壓(ya)直流(liu)電(dian)(dian)(dian)源的(de)(de)特點(dian)是(shi)：輸(shu)出電(dian)(dian)(dian)壓(ya)比輸(shu)入電(dian)(dian)(dian)壓(ya)低；反應速度快(kuai)，輸(shu)出紋波(bo)較小，凱軒(xuan)業電(dian)(dian)(dian)子。

便(bian)攜電(dian)(dian)(dian)(dian)子(zi)(zi)(zi)(zi)設(she)備(bei)(bei)不(bu)管是由交(jiao)流(liu)市(shi)電(dian)(dian)(dian)(dian)經過整(zheng)流(liu)(或(huo)交(jiao)流(liu)適配器(qi))后供(gong)電(dian)(dian)(dian)(dian)，還(huan)是由蓄電(dian)(dian)(dian)(dian)池(chi)組供(gong)電(dian)(dian)(dian)(dian)，工作(zuo)過程中，電(dian)(dian)(dian)(dian)源(yuan)電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)都將在很大范圍內變化(hua)(hua)。比如單體鋰離子(zi)(zi)(zi)(zi)電(dian)(dian)(dian)(dian)池(chi)充(chong)足電(dian)(dian)(dian)(dian)時的(de)(de)(de)電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)為(wei)4.2V，放(fang)完電(dian)(dian)(dian)(dian)后的(de)(de)(de)電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)為(wei)2.3V，變化(hua)(hua)范圍很大。各種(zhong)整(zheng)流(liu)器(qi)的(de)(de)(de)輸出電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)不(bu)但受市(shi)電(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)變化(hua)(hua)的(de)(de)(de)影(ying)響(xiang)，還(huan)受負載變化(hua)(hua)的(de)(de)(de)影(ying)響(xiang)。為(wei)了(le)保(bao)證(zheng)供(gong)電(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)穩定不(bu)變，幾(ji)乎所有(you)(you)的(de)(de)(de)電(dian)(dian)(dian)(dian)子(zi)(zi)(zi)(zi)設(she)備(bei)(bei)都采用穩壓(ya)(ya)(ya)(ya)器(qi)供(gong)電(dian)(dian)(dian)(dian)。小型精密(mi)(mi)電(dian)(dian)(dian)(dian)子(zi)(zi)(zi)(zi)設(she)備(bei)(bei)還(huan)要求(qiu)(qiu)電(dian)(dian)(dian)(dian)源(yuan)非常干(gan)凈（無(wu)紋波(bo)、無(wu)噪聲），以免影(ying)響(xiang)電(dian)(dian)(dian)(dian)子(zi)(zi)(zi)(zi)設(she)備(bei)(bei)正常工作(zuo)。為(wei)了(le)滿(man)足精密(mi)(mi)電(dian)(dian)(dian)(dian)子(zi)(zi)(zi)(zi)設(she)備(bei)(bei)的(de)(de)(de)要求(qiu)(qiu)，應(ying)在電(dian)(dian)(dian)(dian)源(yuan)的(de)(de)(de)輸入端(duan)加入線性(xing)穩壓(ya)(ya)(ya)(ya)器(qi)，以保(bao)證(zheng)電(dian)(dian)(dian)(dian)源(yuan)電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)恒定和實(shi)現有(you)(you)源(yuan)噪聲濾波(bo)。專業(ye)轉換器(qi)設(she)計(ji)研發，深圳凱軒業(ye)電(dian)(dian)(dian)(dian)子(zi)(zi)(zi)(zi)有(you)(you)限公司(si)，竭誠為(wei)您服(fu)務。山西轉換器(qi)平臺

線(xian)性穩壓電(dian)源，是指調(diao)整管工作(zuo)在線(xian)性狀(zhuang)態下的直流(liu)穩壓電(dian)源。選深圳市凱軒業電(dian)子。山西轉換器(qi)平臺

線(xian)(xian)性(xing)(xing)穩(wen)(wen)壓(ya)(ya)(ya)器(qi)的(de)(de)(de)(de)應(ying)(ying)用(yong)線(xian)(xian)性(xing)(xing)穩(wen)(wen)壓(ya)(ya)(ya)器(qi)的(de)(de)(de)(de)主要應(ying)(ying)用(yong)體現在以(yi)(yi)下幾個方(fang)面：1. 簡單(dan)/低(di)(di)成本的(de)(de)(de)(de)解決方(fang)案。線(xian)(xian)性(xing)(xing)穩(wen)(wen)壓(ya)(ya)(ya)器(qi)和LDO簡單(dan)易用(yong)，特別適合于那(nei)些(xie)具(ju)有(you)低(di)(di)輸出(chu)電(dian)流、熱應(ying)(ying)力不很關鍵的(de)(de)(de)(de)低(di)(di)功率應(ying)(ying)用(yong)。無需外部功率電(dian)感器(qi)。2. 低(di)(di)噪(zao)(zao)(zao)聲/低(di)(di)紋(wen)(wen)波應(ying)(ying)用(yong)。對(dui)(dui)于那(nei)些(xie)對(dui)(dui)噪(zao)(zao)(zao)聲敏感的(de)(de)(de)(de)應(ying)(ying)用(yong)（例如(ru)：通信和無線(xian)(xian)電(dian)設備）而(er)言，較大限(xian)度地抑制電(dian)源噪(zao)(zao)(zao)聲是非常(chang)關鍵的(de)(de)(de)(de)。線(xian)(xian)性(xing)(xing)穩(wen)(wen)壓(ya)(ya)(ya)器(qi)具(ju)有(you)非常(chang)低(di)(di)的(de)(de)(de)(de)輸出(chu)電(dian)壓(ya)(ya)(ya)紋(wen)(wen)波（因為(wei)沒(mei)有(you)頻繁接通和關斷的(de)(de)(de)(de)組件），而(er)且線(xian)(xian)性(xing)(xing)穩(wen)(wen)壓(ya)(ya)(ya)器(qi)還可以(yi)(yi)擁(yong)有(you)非常(chang)高的(de)(de)(de)(de)帶寬。所(suo)以(yi)(yi)，幾乎不存在EMI問題(ti)。有(you)些(xie)特殊(shu)的(de)(de)(de)(de)LDO（比如(ru)：凌力爾特的(de)(de)(de)(de) LT1761 LDO系列(lie)）在輸出(chu)端(duan)的(de)(de)(de)(de)噪(zao)(zao)(zao)聲電(dian)壓(ya)(ya)(ya)低(di)(di)至(zhi)20μVRMS.這(zhe)么低(di)(di)的(de)(de)(de)(de)噪(zao)(zao)(zao)聲水(shui)平(ping)SMPS幾乎是不可能實現的(de)(de)(de)(de)。即使采(cai)用(yong)ESR非常(chang)低(di)(di)的(de)(de)(de)(de)電(dian)容器(qi)，SMPS的(de)(de)(de)(de)輸出(chu)紋(wen)(wen)波往(wang)(wang)往(wang)(wang)也(ye)將達到(dao)mV級。山西(xi)轉換(huan)器(qi)平(ping)臺

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