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Cyntec外接電源模塊圖片DC/DC電(dian)(dian)(dian)(dian)開(kai)關(guan)指直流(liu)(liu)(liu)電(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)裝換為直流(liu)(liu)(liu)電(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)的電(dian)(dian)(dian)(dian)開(kai)關(guan)，從這家概念(nian)上看，LDO(壓差(cha)大(da)差(cha)線形電(dian)(dian)(dian)(dian)壓穩壓器(qi))處理器(qi)也應有回歸DC/DC交(jiao)流(liu)(liu)(liu)主機(ji)電(dian)(dian)(dian)(dian)源，但一般(ban)的只(zhi)將電(dian)(dian)(dian)(dian)流(liu)(liu)(liu)放大(da)到電(dian)(dian)(dian)(dian)流(liu)(liu)(liu)，且(qie)此種(zhong)變為的的方法(fa)是由按鈕開(kai)關(guan)的的方法(fa)搞定的交(jiao)流(liu)(liu)(liu)主機(ji)電(dian)(dian)(dian)(dian)源又稱DC/DC外接電(dian)(dian)(dian)(dian)源。

一個(ge)功率變(bian)(bian)換器(qi)，當(dang)輸入、負載和控制(zhi)均為固定值時的(de)(de)(de)工(gong)作狀態(tai)(tai)，在(zai)開關(guan)(guan)(guan)電(dian)(dian)(dian)(dian)(dian)源(yuan)中(zhong)，被稱(cheng)為穩態(tai)(tai)。穩態(tai)(tai)下(xia)，功率變(bian)(bian)換器(qi)中(zhong)的(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)感滿意電(dian)(dian)(dian)(dian)(dian)感電(dian)(dian)(dian)(dian)(dian)壓伏(fu)(fu)秒平衡規(gui)律：對于(yu)(yu)已工(gong)作在(zai)穩態(tai)(tai)的(de)(de)(de)Cyntec電(dian)(dian)(dian)(dian)(dian)源(yuan)模塊DC/DC功率變(bian)(bian)換器(qi)，有源(yuan)開關(guan)(guan)(guan)導通時加在(zai)濾波電(dian)(dian)(dian)(dian)(dian)感上(shang)的(de)(de)(de)正向伏(fu)(fu)秒必(bi)定等于(yu)(yu)有源(yuan)開關(guan)(guan)(guan)截至時加在(zai)該電(dian)(dian)(dian)(dian)(dian)感上(shang)的(de)(de)(de)反向伏(fu)(fu)秒。

Cyntec電(dian)源模塊DC/DC芯片主要是經過反饋電(dian)壓與內部基準電(dian)壓的的比較，然后調理MOS管驅動波形的占空比，來(lai)確保輸出電(dian)壓的安穩。

由于二(er)(er)極管(guan)導(dao)通時(shi)至少(shao)存在0.3V的壓降，因(yin)此續(xu)(xu)流二(er)(er)極管(guan)D所耗(hao)費的功率將會稱(cheng)為(wei)DC/DC電源主(zhu)要功耗(hao)，然后(hou)嚴重約束了效(xiao)率的提(ti)高。為(wei)處理該問題，以導(dao)通電阻極小的MOS管(guan)替代續(xu)(xu)流二(er)(er)極管(guan)。然后(hou)經過控(kong)制(zhi)器同(tong)時(shi)控(kong)制(zhi)開關管(guan)和同(tong)步整(zheng)流管(guan)，要確保兩個MOS管(guan)不能同(tong)時(shi)導(dao)通，負責將會發(fa)生(sheng)短路。

Cyntec電(dian)(dian)源(yuan)模塊(kuai)DC/DC電(dian)(dian)路的硬件規(gui)劃參數(shu)挑(tiao)選規(gui)范

1.設置輸出(chu)電壓：先挑選合(he)適(shi)的(de)R2,R2過小會(hui)導致靜態電流過大(da)，然(ran)后導致加大(da)損耗；R2太大(da)會(hui)導致靜態電流過小，而導致FB引腳(jiao)的(de)反饋電壓對噪聲靈(ling)敏，一般在數據手冊中有推薦值(zhi)規模參(can)閱。

2.電(dian)(dian)(dian)(dian)感(gan)：電(dian)(dian)(dian)(dian)感(gan)的(de)在挑選(xuan)要不(bu)(bu)錯到最近輸(shu)入(ru)不(bu)(bu)大約定(ding)直(zhi)流(liu)(liu)電(dian)(dian)(dian)(dian)壓(ya)直(zhi)流(liu)(liu)電(dian)(dian)(dian)(dian)壓(ya)時，電(dian)(dian)(dian)(dian)感(gan)直(zhi)流(liu)(liu)電(dian)(dian)(dian)(dian)壓(ya)直(zhi)流(liu)(liu)電(dian)(dian)(dian)(dian)壓(ya)也(ye)持之(zhi)以(yi)恒不(bu)(bu)間(jian)斷。在電(dian)(dian)(dian)(dian)感(gan)篩(shai)選(xuan)歷程中(zhong)使用(yong)(yong)需求匯總輸(shu)入(ru)直(zhi)流(liu)(liu)電(dian)(dian)(dian)(dian)壓(ya)直(zhi)流(liu)(liu)電(dian)(dian)(dian)(dian)壓(ya)、紋波(bo)(bo)、表使用(yong)(yong)面積等很多問(wen)題實施思考。不(bu)(bu)大的(de)電(dian)(dian)(dian)(dian)感(gan)將(jiang)引(yin)發較小的(de)紋波(bo)(bo)直(zhi)流(liu)(liu)電(dian)(dian)(dian)(dian)壓(ya)直(zhi)流(liu)(liu)電(dian)(dian)(dian)(dian)壓(ya)，再引(yin)發較低的(de)紋波(bo)(bo)直(zhi)流(liu)(liu)電(dian)(dian)(dian)(dian)壓(ya)，雖然電(dian)(dian)(dian)(dian)感(gan)越大，將(jiang)都(dou)具有更(geng)(geng)好的(de)物理防御占存使用(yong)(yong)面積，更(geng)(geng)大的(de)并聯(lian)電(dian)(dian)(dian)(dian)路圖電(dian)(dian)(dian)(dian)阻器和更(geng)(geng)低的(de)飽(bao)滿直(zhi)流(liu)(liu)電(dian)(dian)(dian)(dian)壓(ya)直(zhi)流(liu)(liu)電(dian)(dian)(dian)(dian)壓(ya)。

3.輸出(chu)電(dian)(dian)容(rong)(rong)：輸出(chu)電(dian)(dian)容(rong)(rong)的(de)挑選(xuan)主要是依(yi)據規劃中所需求的(de)輸出(chu)紋波的(de)要求來進行選(xuan)取。電(dian)(dian)容(rong)(rong)發生(sheng)的(de)紋波:相對(dui)很小，能(neng)夠(gou)忽略(lve)不計(ji)(ji);電(dian)(dian)容(rong)(rong)等效電(dian)(dian)感發生(sheng)的(de)紋波:在300KHz~500KHz以下，能(neng)夠(gou)忽略(lve)不計(ji)(ji)；電(dian)(dian)容(rong)(rong)等效電(dian)(dian)阻發生(sheng)的(de)紋波：與ESR和流過電(dian)(dian)容(rong)(rong)電(dian)(dian)流成正比，該電(dian)(dian)流紋波主要是和開(kai)關(guan)管的(de)開(kai)關(guan)頻率有(you)關(guan)，根本(ben)為(wei)開(kai)關(guan)頻率的(de)n次諧波，為(wei)了減少紋波，讓ESR盡量小。

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