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風華貼片電容大全

風華代理商十強企業(yè)-南京南山

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風華高科: 主頁 > 選型資料 >

貼片電容四大作用:去耦、濾波、旁路和儲能

疊層陶瓷電容器使用陶瓷作為基材,通過復雜和精密的制作工藝,可以在很小的尺寸上,實現(xiàn)多對電極集成于一個狹小空間,目前風華高科大規(guī)模生產(chǎn)的貼片電容最小尺寸可以達到長1.0mm寬0.5mm。處在國家級實驗室中的新品,可以實現(xiàn)更加微小。是否規(guī)模化生產(chǎn)不取決于技術(shù)和工藝,而是市場需求量是否有支撐。貼片電容作為種類繁多的電容器的一個細分種類與它的兄弟姐妹們起到的作用是完全相同。區(qū)別在于具體的電性能和材料特性等因素導致的使用范圍上的差異。由初高中的物理知識中我們知道,在直流電路中,電容器是相當于斷路的。電容器是一種能夠儲藏電荷的元件,也是最常用的電子元件之一。這得從貼片電容器的結(jié)構(gòu)上說起。(常見型號1812B104K101NT、1812B106K6R3NT、1812B224K101NT)

最簡單的電容器是由兩端的極板和中間的絕緣電介質(zhì)(包括空氣)構(gòu)成的。通電后,極板帶電,形成電壓(電勢差),但是由于中間的絕緣物質(zhì),所以整個電容器是不導電的。不過,這樣的情況是在沒有超過電容器的臨界電壓(擊穿電壓)的前提條件下的。(常見型號0805F335M100NT\1206B105K201NT\1206F104M250NT)我們知道,任何物質(zhì)都是相對絕緣的,當物質(zhì)兩端的電壓加大到一定程度后,物質(zhì)是都可以導電的,我們稱這個電壓叫擊穿電壓。電容也不例外,電容被擊穿后,就不是絕緣體了。不過在中學階段,這樣的電壓在電路中是見不到的,所以都是在擊穿電壓以下工作的,可以被當做絕緣體看。

但是,在交流電路中,因為電流的方向是隨時間成一定的函數(shù)關(guān)系變化的。而電容器充放電的過程是有時間的,這個時候,在極板間形成變化的電場,而這個電場也是隨時間變化的函數(shù)。實際上,電流是通過場的形式在電容器間通過的。在中學階段,有句話,就叫通交流,阻直流,說的就是電容的這個性質(zhì)。了解了貼片電容的構(gòu)成,下面讓我們詳細說明貼片電容在電路環(huán)境所起到的作用:

去耦電容
  去耦,又稱解耦。從電路來說,總是可以區(qū)分為驅(qū)動的源和被驅(qū)動的負載。如果負載電容比較大,驅(qū)動電路要把電容充電、放電,才能完成信號的跳變,在上升沿比較陡峭的時候,電流比較大,這樣驅(qū)動的電流就會吸收很大的電源電流,由于電路中的電感,電阻(特別是芯片管腳上的電感,會產(chǎn)生反彈),這種電流相對于正常情況來說實際上就是一種噪聲,會影響前級的正常工作,這就是所謂的“耦合”。去耦電容就是起到一個“電池”的作用,滿足驅(qū)動電路電流的變化,避免相互間的耦合干擾。將旁路電容和去藕電容結(jié)合起來將更容易理解。旁路電容實際也是去耦合的,只是旁路電容一般是指高頻旁路,也就是給高頻的開關(guān)噪聲提高一條低阻抗泄防途徑。高頻旁路電容一般比較小,根據(jù)諧振頻率一般取0.1μF、0.01μF等;而去耦合電容的容量一般較大,可能是10μF或者更大,依據(jù)電路中分布參數(shù)、以及驅(qū)動電流的變化大小來確定。(本文來自風華電容代理商南京南山官方網(wǎng)站http://www.nscn.com.cn/tiepiandianrong.html)旁路是把輸入信號中的干擾作為濾除對象,而去耦是把輸出信號的干擾作為濾除對象,防止干擾信號返回電源。這應(yīng)該是他們的本質(zhì)區(qū)別。

圖片說明:南京南山半導體有限公司超過10億pcs貼片電容器現(xiàn)貨中轉(zhuǎn)庫存
旁路電容
旁路電容是為本地器件提供能量的儲能器件,它能使穩(wěn)壓器的輸出均勻化,降低負載需求。就像小型可充電電池一樣,旁路電容能夠被充電,并向器件進行放電。為盡量減少阻抗,旁路電容要盡量靠近負載器件的供電電源管腳和地管腳。這能夠很好地防止輸入值過大而導致的地電位抬高和噪聲。地電位是地連接處在通過大電流毛刺時的電壓降。

儲能電容
  儲能型電容器通過整流器收集電荷,并將存儲的能量通過變換器引線傳送至電源的輸出端。電壓額定值為40~450VDC、電容值在220~150000μF之間的鋁電解電容器(如EPCOS公司的B43504或B43505)是較為常用的。根據(jù)不同的電源要求,器件有時會采用串聯(lián)、并聯(lián)或其組合的形式,對于功率級超過10KW的電源,通常采用體積較大的罐形螺旋端子電容器。


濾波電容
濾波是電容器的一個非常重要的功能。從理論上(即假設(shè)電容為純電容)說,電容越大,阻抗越小,通過的頻率也越高。但實際上超過1μF的電容大多為電解電容,有很大的電感成份,所以頻率高后反而阻抗會增大。有時會看到有一個電容量較大電解電容并聯(lián)了一個小電容,這時大電容通低頻,小電容通高頻。電容的作用就是通高阻低,通高頻阻低頻。電容越大低頻越容易通過。具體用在濾波中,大電容(1000μF)濾低頻,小電容(20pF)濾高頻。曾有網(wǎng)友形象地將濾波電容比作“水塘”。由于電容的兩端電壓不會突變,由此可知,信號頻率越高則衰減越大,可很形象的說電容像個水塘,不會因幾滴水的加入或蒸發(fā)而引起水量的變化。它把電壓的變動轉(zhuǎn)化為電流的變化,頻率越高,峰值電流就越大,從而緩沖了電壓。濾波就是充電,放電的過程。
南京南山為您提供風華高科全系列電容電阻和電感以及二三極管等產(chǎn)品,現(xiàn)有中轉(zhuǎn)庫存超過10億pcs 。其中單純風華高科品牌貼片電容現(xiàn)貨中轉(zhuǎn)庫存中不同封裝和標稱容量的具體型號超過1100個,總數(shù)量超過6萬K,均為南京南山優(yōu)質(zhì)客戶的針對性備貨或中轉(zhuǎn)備貨,歡迎實地驗證。買風華貼片電容,就找南京南山。
0603B104K500NT 4122.405k
0805B104K500NT 4016.13k
0603B102K500NT 1626.88k
0603B103K500NT 1609.475k
0805B333K500NT 1575.735k
0603CG220J500NT 1543.875k
0603B391K500NT 1271.55k
0402B103K500NT 1250.11k
0603F104M500NT 1034.298k
0805X106K160NT 2K/P 1018.2k
0603F105M250NT 882.44k
0603B224K160NT 804k
0805B223K500NT 758.225k

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