CAPACITOR
5000
N A/25+
提供BOM一站式配單服務(wù)
CAPACITOR
5270
SMD/21+
-
CAPACITOR
6286
N A/N/A
原裝正品熱賣(mài),價(jià)格優(yōu)勢(shì)
CAPACITOR
5000
N A/-
原裝正品,配單能手
CAPACITOR
80000
-/23+
原裝現(xiàn)貨
CAPACITOR
13250
NA//23+
原裝現(xiàn)貨,當(dāng)天可交貨,原型號(hào)開(kāi)票
CAPACITOR
5000
N A/23+
優(yōu)勢(shì)產(chǎn)品大量庫(kù)存原裝現(xiàn)貨
CAPACITOR
8700
N A/2023+
原裝現(xiàn)貨
CAPACITOR
80000
-/23+
原裝現(xiàn)貨
CAPACITOR
68900
SMD/-
一手渠道 假一罰十 原包裝常備現(xiàn)貨林R Q2280193667
CAPACITOR
10000
N A/25+
提供一站式配單服務(wù)
CAPACITOR
168000
SMD/23+
全新原裝現(xiàn)貨/實(shí)單價(jià)格支持/優(yōu)勢(shì)渠道
CAPACITOR
2000
N A/25+
只做原裝,支持賬期,提供一站式配單服務(wù)
CAPACITOR
8913
SMD/23+
柒號(hào)芯城,離原廠的距離只有0.07公分
CAPACITOR
60701
N A/24+
深圳原裝現(xiàn)貨,可看貨可提供拍照
CAPACITOR
228000
NR/2017+
誠(chéng)研翔科技,配單公司,可開(kāi)增值稅發(fā)票
CAPACITOR
65286
-/21+
全新原裝現(xiàn)貨,長(zhǎng)期供應(yīng),免費(fèi)送樣
CAPACITOR
6608
N A/2024+
現(xiàn)貨假一罰萬(wàn)只做原裝現(xiàn)貨
CAPACITOR
5000
N A/22+
一站式配單,只做原裝
CAPACITOR
3588
-/-
原裝 部分現(xiàn)貨量大期貨
CAPACITORS
Aluminum Electrolytic Capacitors(90....
ETC
CAPACITORSPDF下載
soft switching state, the turn-on current stress and turn-off voltage stress is small. 1 operational principles fig.1 shows the circuit diagram of the half-bridge converter. in the schematic, lr1 to lr4 are resonant inductors, the cr is resonant capacitor, s1 and s2 are main switches, s3 and s4 are auxiliary switches, d1 to d4 are anti-parallel diodes in the switches, cs1 to cs4 are snubber-capacities. the circuit is the conventional half bridge topology incorporating the auxiliary resonant tank tha
的有效手段。 規(guī)格 輸入電壓:5.5v至16v 第1路轉(zhuǎn)換器輸出電壓 = 3.3v/2a (最大值) 第2路轉(zhuǎn)換器輸出電壓 = 2.5v/1a (最大值) 每路轉(zhuǎn)換器的開(kāi)關(guān)頻率(fsw) = 2mhz 環(huán)境溫度(ta) = -40°c至+85°c 圖1. max5073參考設(shè)計(jì) 表1. 材料清單 designator value description part footprint manufacturer quantity c1 100μf/35v capacitor eevfk1v101p 8mm x 10.2mm panasonic 1 c2, c3, c4, c17, c18 0.1μf/25v capacitors grm188r71e104ka01d 603 murata 5 c5, c6, c7 22μf/6.3v capacitors grm31cr60j226ke19 1206 murata 2 c8, c9 10μf/25v capacitors grm31cr61e106ka12 1206 murata 1 c10, c12 2.
★ 當(dāng)u2為正半周并且數(shù)值大于電容兩端電壓uc時(shí),二極管d1和d3管導(dǎo)通,d2和d4管截止,電流一路流經(jīng)負(fù)載電阻rl,另一路對(duì)電容c充電。當(dāng)uc>u2,導(dǎo)致d1和d3管反向偏置而截止,電容通過(guò)負(fù)載電阻rl放電,uc按指數(shù)規(guī)律緩慢下降。 ★ the diode d1&d3 work, d2&d4 cut off, the current flows through the load resistance rl in a loop and charge the capacitor c up when u2 in the positive half circuit and its value exceeding the voltage uc which is parallel connected in the two terminals of capacitor. when uc exceeds u2, and causes the diode d1&d3 cut off, the capacitor discharge through the load resi
上分別*正負(fù)電子,而電解質(zhì)溶液中的正負(fù)離子將由于電場(chǎng)作用分別*到與正負(fù)極板相對(duì)的界面上,從而形成兩個(gè)集電層。 由于活性碳材料具有≥1200m2/g的超高比表面積(即獲得了極大的電極面積),而且電解質(zhì)與多孔電極間的界面距離不到1nm(即獲得了極小的介質(zhì)厚度),所以這種雙電層結(jié)構(gòu)的超級(jí)電容器比傳統(tǒng)的物理電容的容值要大很多,比容量可以提高100倍以上,從而使利用電容器進(jìn)行大電量的儲(chǔ)能成為可能。 目前國(guó)際上研究與發(fā)展的超級(jí)電容器可歸為以下幾類(lèi): ●雙層電容器(double layer capacitor) 由高表面碳電極在水溶液電解質(zhì)(如硫酸等)或有機(jī)電解質(zhì)溶液中形成的雙電層電容,如圖6-12.1所示。該圖還表示出一個(gè)典型雙電層的形成原理,顯然雙電層是在電極材料(包括其空隙中)與電解質(zhì)交界面兩側(cè)形成的,雙電層電容量的大小取決于雙電層上分離電荷的數(shù)量,因此電極材料和電解質(zhì)對(duì)電容量的影響最大。一般都采用多孔高表面積碳作為雙層電容器電極材料,其比表面積可達(dá)1000-3000m2/g,比電容可達(dá)280f/g。 ●贗電容器(pseudo-capacitor) 由電極表面上或者體相中的二
能夠很好地匹配,即電容c1=c2,這時(shí)理想傳輸特性曲線如圖2所示,同時(shí)本級(jí)余差輸出vi為: 由式(2)和式(3)的對(duì)比中可以看出,電容失配會(huì)使余差輸出產(chǎn)生誤差,從而對(duì)adc的精度造成影響。 3 電容誤差平均技術(shù)介紹 電容誤差平均技術(shù)是一種重要的對(duì)溫度和老化不敏感的校準(zhǔn)方法。其基本思想是利用電容交換得到2個(gè)帶有互補(bǔ)誤差的輸出,然后進(jìn)行平均使原先的誤差由一階變?yōu)楦唠A,從而得到較為精確的輸出。 3.1 有源電容誤差平均技術(shù) 有源誤差平均技術(shù)(active capacitor error-aver-aging technique,acea),其電路結(jié)構(gòu)同標(biāo)準(zhǔn)流水線型adc基本相同,不同的是其在冗余放大器之后增加了一個(gè)誤差平均放大器。同時(shí),時(shí)鐘由2相變?yōu)?相,分別為采樣相、放大相以及平均相。工作過(guò)程如圖3所示。由于在實(shí)際電路當(dāng)中電容之間均存在不匹配,在這里假定冗余放大器和平均放大器輸入端相連的電容值分別為電容c和c(1+α)以及c1和c1(1+β),α和β分別為電容的失配系數(shù)。 在采樣相,輸入電壓vi-1被電容c和c(1+α)所采樣;然后在放大相,電容c(1+α
就像今年絕大部分的電子零組件市場(chǎng)一般,由于消費(fèi)電子需求擴(kuò)張,電容器(capacitor)制造商也正經(jīng)歷產(chǎn)品需求大幅增加的階段。但是電容器市場(chǎng)景氣,仍會(huì)受到出貨時(shí)間拉長(zhǎng)、價(jià)格上揚(yáng)和零組件供貨不足等因素的影響而有所波動(dòng)。 盡管電容器組件的價(jià)格就跟其極微小的尺寸一般,大概只有1分美元左右,但電容器具有代表電子產(chǎn)業(yè)需求趨勢(shì)的帶頭作用。因?yàn)殡娙萜鞅粡V泛地采用于幾乎所有的電子產(chǎn)品當(dāng)中。例如,蘋(píng)果的ipad產(chǎn)品就包含702種電容器;而iphone 4內(nèi)也有469個(gè)電容器組件。 電容器一般可分為鋁質(zhì)電容(aluminum capacitor)、陶瓷電容(ceramic capacitor)和鉭質(zhì)電容(tantalum capacitor)這三種。根據(jù)市調(diào)機(jī)構(gòu)isuppli最新的市場(chǎng)分析,雖然今年鋁質(zhì)電容器的需求正明顯成長(zhǎng),不過(guò)交貨時(shí)間也跟著拉長(zhǎng),價(jià)格也過(guò)于偏高。目前鋁質(zhì)電容組件的交貨時(shí)間延長(zhǎng)至18周,比起市場(chǎng)能夠預(yù)期接受的10到12周還要久。 交貨時(shí)間拉長(zhǎng),組件價(jià)格也跟著水漲船高,因此與智能型手機(jī)芯片、以及其他電子組件的狀況類(lèi)似,電容器組件的缺貨情況可能要到今年第4季、甚至是明年第1季才會(huì)有所改善
、陶瓷基板 勤發(fā)電子股份有限公司chinfa electronics ind. co., ltd. w3.3554 36 sqm din rail psu、ac/dc power module、dc/dc converter、enclosed power、dc ups controller 創(chuàng)格電子實(shí)業(yè)有限公司chuang ge electronic industrial co., ltd. w3.3514 36 sqm mkp-x2 filtering capacitors、mkp-x2 film capacitors、mkph igbt film capacitors、cbb20 metalized polypropylene film capacitors、mkph-sb/sc igbt snubbed capacitors、energy storage capacitors mkt-d energy storage capacitor、resonance capacitors for induction cooker、cbb60 film capacito
否會(huì)消失,半導(dǎo)體存儲(chǔ)器又分為可揮發(fā)性存儲(chǔ)器(volatile memory)和不可揮發(fā)性存儲(chǔ)器(nonvolatile memory, nvm)兩大基本類(lèi)型。作為半導(dǎo)體存儲(chǔ)器技術(shù)及其工藝制程講座系列之一,本文先對(duì)最常見(jiàn)的、也是中芯國(guó)際正在生產(chǎn)和研制的幾種最基本的半導(dǎo)體存儲(chǔ)器做一個(gè)簡(jiǎn)要的介紹。 動(dòng)態(tài)隨機(jī)存取存儲(chǔ)器(dynamic random access memory, dram) 現(xiàn)代超大容量dram的存儲(chǔ)單元(圖2),基本上都是由一個(gè)晶體管(mos)和一個(gè)電容器(capacitor)組成,其中晶體管作為開(kāi)關(guān)起到地址選擇的作用,而電容器通過(guò)所儲(chǔ)蓄的電荷用作為一個(gè)動(dòng)態(tài)的存儲(chǔ)元器件。晶體管的多晶硅柵電極同時(shí)作為字線(wl),它的漏(drain, d)和源(source, s)一端接到以局域互連(local interconnect, il)金屬導(dǎo)線為載體的位線(bl)上,另一端接到存儲(chǔ)信息的電容器上。在寫(xiě)入信息時(shí),位線(bl)加高電壓(寫(xiě)1)或地電壓(寫(xiě)0),字線(wl)加高電壓促使晶體管(mos)導(dǎo)通,電容器(capacitor)相應(yīng)為有電荷(1)或無(wú)電荷(0);當(dāng)字線(wl
麥瑞半導(dǎo)體近日宣布針對(duì)高功率密度dc/dc應(yīng)用開(kāi)發(fā)了superswitcher ii 系列mosfet集成降壓穩(wěn)壓器。mic26xxx superswitcher ii 系列含三款dc/dc降壓穩(wěn)壓器,均采用了麥瑞半導(dǎo)體專有的hyper speed control 架構(gòu)。mic26400、mic26600 和mic26950 器件的輸入電源電壓范圍是4.5v到26v,輸出電流分別為5a、7a和12a。superswitcher ii 系列可與任何電容產(chǎn)品﹝any capacitor ﹞配套使用,不受輸出esr影響,因此解決了長(zhǎng)期以來(lái)電源設(shè)計(jì)者在采用分布式輸出電容時(shí)遇到的穩(wěn)定性問(wèn)題。mic26400, mic26600 和 mic26950目前已批量供貨,起價(jià)1k量級(jí)單價(jià)分別為1.82美元、2.20美元、2.77美元。 麥瑞半導(dǎo)體模擬產(chǎn)品營(yíng)銷(xiāo)副總裁andrew cowell表示:“superswitcher ii 系列尺寸小,集成度高,可提供無(wú)可比擬的性能,降低了產(chǎn)品周期、尺寸和成本?!?(點(diǎn)擊圖片放大) 麥瑞半導(dǎo)體模擬電源高級(jí)營(yíng)銷(xiāo)總監(jiān)doyle slack表示:“通過(guò)采用我們專有的
sram在手機(jī)上的地位。 pseudo sram具有大內(nèi)存容量、低成本、高頻率速度、低功率消耗的優(yōu)點(diǎn)。在許多通信應(yīng)用領(lǐng)域,現(xiàn)在需要成本更低、容量更大的低功率內(nèi)存。而未來(lái)的pseudo sram產(chǎn)品將會(huì)以更具吸引力的價(jià)格,提供更大容量和更低功率,滿足這些市場(chǎng)的需求。 pseudo sram是由dram macro core+sram interface之架構(gòu)所組成。dram macro core是采取傳統(tǒng)dram為核心,memory cell由1 transistor+1 capacitor所組成;sram interface則設(shè)計(jì)與傳統(tǒng)sram特性兼容的架構(gòu)。pseudo sram設(shè)計(jì)了一個(gè)on-chip refresh circuit,外接的接口則采用sram的接口,以增加讀取速度并降低使用者在設(shè)計(jì)上的困擾。在工藝上pseudo sram可以使用現(xiàn)有的dram的制程,記憶體的大小已可縮小至110nm及90nm的工藝,大幅降低pseudo sram的成本,低成本(cost over mb)已成為pseudo sram的最主要的利器。pseudo sram具有下列的特色:·大的內(nèi)存
高電流電源輸出電路 元件bom表: r1 680 ohm 1/4 watt resistor c1 20,000 - 50,000uf 20-40 volt capacitor c2, c3 100uf 50 volt capacitor c4 0.1uf 50 volt capacitor c5 0.01uf 50 volt capacitor d1 zener diode (see notes) q1 2n3055 or other (see notes) t1 transformer (see notes) br1 bridge rectifier (see notes) s1 spst 250 vac 10 a switch misc case, line cord, heatsink for q1, binding posts for output 來(lái)源:xienag
assemble by soldering the components to the pads indicated. keep coil, resistor, and capacitor leads as short as possible. the coils should be 3/16" to 1/4" above the board and separate turns by one wire diameter. bend leads to form a little mounting foot for soldering to the circuit board. tuning and power output are affected by the distance between the coil turns, you can make fine adjustments by either spreading or compressing the coil slightly. the area surrounding the pads is ground. c2, c
get on with the project. the circuit the circuit itself is fairly conventional, with a couple of small refinements. it all begins with tr1 (bc547) in an inverted hartley oscillator configuration. the feedback to the base of tr1 is via a small 4.7pf capacitor to help keep the oscillations as weak as possible whilst allowing the oscillator to be a reliable starter. the frequency of the oscillator is determined by l1 and the 22pf trimmer capacitor and functions in the range of about 76mhz to 119mhz using t
材料bom表: j1 = rca audio input socket j2 = rca audio input socket c1 = 0.1uf-16v ceramic disc capacitor c2 = 0.1uf-16v ceramic disc capacitor c3 = 0.1uf-16v ceramic disc capacitor ic1 = ds1669 (is available from dallas sco. sw1 = momentary push button switch sw1 = momentary push button switch 來(lái)源:lidy
; watt resistor r5 680 ohm ¼ watt resistor r6,r7 0.15 ohm 10 watt resistor (tech america 900-1006) r8 2.7k ¼ watt resistor r9 1k trimmer potentiometer (rs271-280) r10 3.3k ¼ watt resistor c1,c2,c3,c4 4700 microfarad electrolytic capacitor 35 volt (observe polarity) c5 100 picofarad ceramic disk capacitor c6 1000 microfarad electrolytic capacitor 25 volt (observe polarity) ic1 lm723 (rs276-1740) voltage regulator ic. socket is recommended. q1 tip3055t (rs276-2020) npn transistor (to-2
er time一詞怎樣譯才合適?basic charge measurement methods 電荷測(cè)量的基本方法[239]charge is difficult to measure directly; it must be related to an easily measured quantity. one commonly used method of making this type of measurement is to measure the voltage across a capacitor of known value. the charge is related to capacitor voltage as follows: [239]直接測(cè)量電荷很困難,必須通過(guò)與它相關(guān)的其它容易測(cè)量的量來(lái)測(cè)量。這種類(lèi)型的測(cè)量普遍使用的方法是測(cè)量已知電容值的兩端電壓,電荷和電容電壓有如下關(guān)系: [240]q = cv where: q = capacitor charge (coulombs) c = capacitor value (farads) v = voltage across
請(qǐng)教電子英語(yǔ)c1 coupling capacitor between the pre-amplifier stages- this capacitor defines the lower limit of the receiver frequencyc2 filter capacitor- the recommended value shall be usedc3 demodulation capacitor- the recommended value shall be usedc4 capacitor for regulation- this capacitor defines the time constant for the regulation; select its value in that mannerto avoid any shortening of the pulse width of time code signal which can be caused by apostregulation of the amplificationq1 filter crystal- ins
e tested at 4kv, x2 for ac wall-let impulsed voltage tested at 2.5 kv.2. y cap are line to neutral ground. 4700 pf. small to limit ac leakage current. y1 for double insulation impulsed tested at 8kv, y2 for basic insulation impulsed tested at 5kv.3. capacitor discharge: the capacitor discharge test ensures that if an ac plug is abruptly removed from its receptacle, the voltage across the line and neutral terminals will not exceed a safe level. per ul 1950, voltage across a capacitance greater than 0.1 μf
小文章,考慮到最近不時(shí)有人提問(wèn)有關(guān)此類(lèi)問(wèn)題,也覺(jué)得有一定的意義,故而整理一下,帖出來(lái)供大家參考。只是個(gè)別地方譯不出來(lái),有點(diǎn)遺憾。 這次趕巧了,今天還知道有位小老鄉(xiāng)趕上今天生日,說(shuō)好了算作今天偶給她的小禮物,愿她能及早看到。 september 5,2001rubycon corporation engineering division to: acbel polytech inc. lifetime calculation formula of aluminum electrolytic capacitors 鋁電解電容的壽命的計(jì)算公式 1. lifetime calculation formula 壽命計(jì)算公式 l : life expectancy at the time of actual use.實(shí)際使用平均壽命lb : basic life at maximum operating temperature 最大工作溫度下的基本壽命tmax : maximum operating temperature 最大工作溫度ta : actual ambient temperature 實(shí)際環(huán)境
pled“ground” actually join at the power supply, the “glitch”on the ground lines is similar to the “glitch” on the negativesupply bus. depending upon how the feedback andsignal sources are “grounded,” the effective disturbancecaused by the decoupling capacitor may be larger than thedisturbance it was intended to prevent. 3a這張圖不理解,有更加具體的例子嗎?放大器的輸出電流是如何流動(dòng)到"poweer supply terminal"上的.也許我應(yīng)該這么認(rèn)為,acb三點(diǎn)之間我可以看成其它接在正電源和地之間的元器件,信號(hào)電流從這些元器件流動(dòng).使得干擾串到負(fù)電源上.2.figure 3b showshow the decoupling capacitor can be us