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Cyntec電源適配器傳感器DC/DC開關(guan)交(jiao)(jiao)(jiao)流(liu)(liu)電(dian)(dian)(dian)(dian)源指交(jiao)(jiao)(jiao)流(liu)(liu)電(dian)(dian)(dian)(dian)變壓(ya)(ya)(ya)器準(zhun)換(huan)為交(jiao)(jiao)(jiao)流(liu)(liu)電(dian)(dian)(dian)(dian)變壓(ya)(ya)(ya)器的(de)開關(guan)交(jiao)(jiao)(jiao)流(liu)(liu)電(dian)(dian)(dian)(dian)源，從一個表述上看，LDO(低壓(ya)(ya)(ya)證書差(cha)線形交(jiao)(jiao)(jiao)流(liu)(liu)穩壓(ya)(ya)(ya)器)集成電(dian)(dian)(dian)(dian)路芯片也理應終(zhong)歸于DC/DC電(dian)(dian)(dian)(dian)，但一般的(de)只將交(jiao)(jiao)(jiao)流(liu)(liu)電(dian)(dian)(dian)(dian)轉化(hua)到交(jiao)(jiao)(jiao)流(liu)(liu)電(dian)(dian)(dian)(dian)，且類似這些轉化(hua)的(de)方(fang)式(shi)(shi)是(shi)由電(dian)(dian)(dian)(dian)開關(guan)的(de)方(fang)式(shi)(shi)達成的(de)電(dian)(dian)(dian)(dian)喻為DC/DC外接電(dian)(dian)(dian)(dian)源。

一個功(gong)(gong)率(lv)變換(huan)器(qi)，當輸入(ru)、負載和控(kong)制均(jun)為(wei)固定(ding)(ding)值時的工作(zuo)狀態(tai)(tai)，在(zai)(zai)開(kai)關(guan)電(dian)源中，被稱為(wei)穩態(tai)(tai)。穩態(tai)(tai)下，功(gong)(gong)率(lv)變換(huan)器(qi)中的電(dian)感滿意電(dian)感電(dian)壓伏秒平衡(heng)規律(lv)：對于已工作(zuo)在(zai)(zai)穩態(tai)(tai)的Cyntec電(dian)源模(mo)塊DC/DC功(gong)(gong)率(lv)變換(huan)器(qi)，有源開(kai)關(guan)導通時加(jia)在(zai)(zai)濾波電(dian)感上(shang)的正向伏秒必(bi)定(ding)(ding)等于有源開(kai)關(guan)截至時加(jia)在(zai)(zai)該電(dian)感上(shang)的反向伏秒。

Cyntec電源模塊DC/DC芯片主要是經過反饋(kui)電壓(ya)與內(nei)部基準電壓(ya)的的比較，然后調理(li)MOS管驅(qu)動波形的占(zhan)空比，來確(que)保(bao)輸出(chu)電壓(ya)的安穩(wen)。

由于二極(ji)管(guan)導通(tong)時(shi)至少存在0.3V的壓降，因此續(xu)流(liu)二極(ji)管(guan)D所耗費的功(gong)率(lv)將(jiang)會稱為(wei)(wei)DC/DC電(dian)源主要(yao)功(gong)耗，然后嚴(yan)重約束(shu)了(le)效率(lv)的提(ti)高。為(wei)(wei)處理該問(wen)題，以導通(tong)電(dian)阻(zu)極(ji)小的MOS管(guan)替(ti)代續(xu)流(liu)二極(ji)管(guan)。然后經過控(kong)(kong)制(zhi)器同(tong)時(shi)控(kong)(kong)制(zhi)開(kai)關管(guan)和(he)同(tong)步整流(liu)管(guan)，要(yao)確保兩個MOS管(guan)不(bu)能同(tong)時(shi)導通(tong)，負(fu)責將(jiang)會發生短(duan)路(lu)。

Cyntec電源模塊DC/DC電路的硬件規劃參數挑(tiao)選規范

1.設置輸出電壓：先挑(tiao)選合適的(de)R2,R2過小會導(dao)(dao)致靜(jing)態電流過大(da)，然后導(dao)(dao)致加大(da)損耗(hao)；R2太大(da)會導(dao)(dao)致靜(jing)態電流過小，而導(dao)(dao)致FB引(yin)腳的(de)反饋電壓對噪聲靈敏，一般在數據手冊中有推薦值規模(mo)參閱。

2.電(dian)(dian)感(gan)：電(dian)(dian)感(gan)的做好(hao)要理想直(zhi)至傳輸(shu)最少規定工(gong)(gong)作功率(lv)時，電(dian)(dian)感(gan)工(gong)(gong)作功率(lv)也堅持不(bu)懈聯(lian)續。在電(dian)(dian)感(gan)排(pai)序(xu)歷(li)程中要歸(gui)類傳輸(shu)工(gong)(gong)作功率(lv)、紋波(bo)、空(kong)間(jian)等若干原則展開(kai)要考慮到。較多的電(dian)(dian)感(gan)將(jiang)使(shi)得較小的紋波(bo)工(gong)(gong)作功率(lv)，然而使(shi)得較低的紋波(bo)電(dian)(dian)流(liu)大(da)小電(dian)(dian)壓，只不(bu)過電(dian)(dian)感(gan)越大(da)，將(jiang)有最大(da)的熱(re)學占存占地面積，越高的并聯(lian)電(dian)(dian)路圖熱(re)敏電(dian)(dian)阻和(he)更低的過飽(bao)和(he)工(gong)(gong)作功率(lv)。

3.輸出(chu)電容：輸出(chu)電容的(de)(de)挑選(xuan)主(zhu)要是依據規(gui)劃中所需求(qiu)(qiu)的(de)(de)輸出(chu)紋(wen)(wen)(wen)波(bo)的(de)(de)要求(qiu)(qiu)來進行(xing)選(xuan)取(qu)。電容發(fa)生(sheng)的(de)(de)紋(wen)(wen)(wen)波(bo):相對很小，能夠(gou)忽(hu)略不計(ji)(ji);電容等(deng)效電感發(fa)生(sheng)的(de)(de)紋(wen)(wen)(wen)波(bo):在300KHz~500KHz以下，能夠(gou)忽(hu)略不計(ji)(ji)；電容等(deng)效電阻發(fa)生(sheng)的(de)(de)紋(wen)(wen)(wen)波(bo)：與ESR和流(liu)(liu)過電容電流(liu)(liu)成正(zheng)比(bi)，該電流(liu)(liu)紋(wen)(wen)(wen)波(bo)主(zhu)要是和開關(guan)(guan)管的(de)(de)開關(guan)(guan)頻(pin)率(lv)(lv)有關(guan)(guan)，根本為開關(guan)(guan)頻(pin)率(lv)(lv)的(de)(de)n次諧波(bo)，為了減(jian)少紋(wen)(wen)(wen)波(bo)，讓ESR盡量小。

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