The MP1582 is a high frequency step-down SWITCHING regulator with integrated internalhigh-sid
標(biāo)簽： Converter Step-Down 15822A 15822
上傳時(shí)間： 2013-06-13
上傳用戶：skfreeman
AX3121 consists of step-down SWITCHING regulator with synchronous PWMconverter. These devise inc
標(biāo)簽： Synchronous Converter 3121 buck
上傳時(shí)間： 2013-07-19
上傳用戶：zhuyibin
近年來(lái)提出的光突發(fā)交換OBS(Optical．Burst SWITCHING)技術(shù)，結(jié)合了光路交換(OCS)與光分組交換(OPS)的優(yōu)點(diǎn)，有效支持高突發(fā)、高速率的多種業(yè)務(wù)，成為目前研究的熱點(diǎn)和前沿。 本論文圍繞國(guó)家“863”計(jì)劃資助課題“光突發(fā)交換關(guān)鍵技術(shù)和試驗(yàn)系統(tǒng)”，主要涉及兩個(gè)方面：LOBS邊緣節(jié)點(diǎn)核心板和光板FPGA的實(shí)現(xiàn)方案，重點(diǎn)關(guān)注于邊緣節(jié)點(diǎn)核心板突發(fā)包組裝算法。 本文第一章首先介紹LOBS網(wǎng)絡(luò)的背景、架構(gòu)，分析了LOBS網(wǎng)絡(luò)的關(guān)鍵技術(shù)，然后介紹了本論文后續(xù)章節(jié)研究的主要內(nèi)容。 第二章介紹了LOBS邊緣節(jié)點(diǎn)的總體結(jié)構(gòu)，主要由核心板和光板組成。核心板包括千兆以太網(wǎng)物理層接入芯片，突發(fā)包組裝FPGA，突發(fā)包調(diào)度FPGA，SDRAM以及背板驅(qū)動(dòng)芯片($2064)等硬件模塊。光板包括$2064，發(fā)射FPGA，接收FPGA，光發(fā)射機(jī)，光接收機(jī)，CDR等硬件模塊。論文對(duì)這些軟硬件資源進(jìn)行了詳細(xì)介紹，重點(diǎn)關(guān)注于各FPGA與其余硬件資源的接口。 第三章闡明了LOBS邊緣節(jié)點(diǎn)FPGA的具體實(shí)現(xiàn)方法，分為核心板突發(fā)包組裝FPGA和光板FPGA兩部分。核心板FPGA對(duì)數(shù)據(jù)和描述信息分別存儲(chǔ)，僅對(duì)描述信息進(jìn)行處理，提高了組裝效率。在維護(hù)突發(fā)包信息時(shí)，實(shí)時(shí)查詢和更新FEC配置表，保證了對(duì)FEE狀態(tài)表維護(hù)的靈活性。在讀寫SDRAM時(shí)都采用整頁(yè)突發(fā)讀寫模式，對(duì)MAC幀整幀一次性寫入，讀取時(shí)采用超前預(yù)讀模式，對(duì)SDRAM內(nèi)存的使用采取即時(shí)申請(qǐng)方式，十分靈活高效。光板FPGA分為發(fā)射和接收兩個(gè)方向，主要是將進(jìn)入FPGA的數(shù)據(jù)進(jìn)行同步后按照指定的格式發(fā)送。 第四章總結(jié)了論文的主要內(nèi)容，并對(duì)LOBS技術(shù)進(jìn)行展望。本論文組幀算法采用動(dòng)態(tài)組裝參數(shù)表的方法，可以充分支持各種擴(kuò)展，包括自適應(yīng)動(dòng)態(tài)組裝算法。
標(biāo)簽： LOBS FPGA 節(jié)點(diǎn)
上傳時(shí)間： 2013-05-26
上傳用戶：AbuGe
General Description The LM621 is a bipolar IC designed for commutation of brushless DC motors. The part is compatible with both three- and four-phase motors. It can directly drive the power SWITCHING devices used to drive the motor. The LM621 provides an adjustable dead-time circuit to eliminate ``shootthrough'' current spiking in the power SWITCHING circuitry. Operation is from a 5V supply, but output swings of up to 40V are accommodated. The part is packaged in an 18-pin, dual-in-line package.
標(biāo)簽： 621 LM 無(wú)刷電機(jī)
上傳時(shí)間： 2013-07-24
上傳用戶：sdq_123
·【原 書 名】 SWITCHING Power Supply Design 【原出版社】 McGraw-Hill 【作 者】（美）Abraham I.Pressman [同作者作品] 【譯 者】 王志強(qiáng)[同譯者作品] 【叢 書 名】 電源系列叢書 【出 版 社】 電子工業(yè)出版社 【書 號(hào)
標(biāo)簽： 開(kāi)關(guān)電源設(shè)計(jì)
上傳時(shí)間： 2013-06-10
上傳用戶：kiklkook
The MAX17600–MAX17605 devices are high-speedMOSFET drivers capable of sinking /sourcing 4A peakcurrents. The devices have various inverting and noninvertingpart options that provide greater flexibility incontrolling the MOSFET. The devices have internal logiccircuitry that prevents shoot-through during output-statchanges. The logic inputs are protected against voltagespikes up to +14V, regardless of VDD voltage. Propagationdelay time is minimized and matched between the dualchannels. The devices have very fast SWITCHING time,combined with short propagation delays (12ns typ),making them ideal for high-frequency circuits. Thedevices operate from a +4V to +14V single powersupply and typically consume 1mA of supply current.The MAX17600/MAX17601 have standard TTLinput logic levels, while the MAX17603 /MAX17604/MAX17605 have CMOS-like high-noise margin (HNM)input logic levels. The MAX17600/MAX17603 are dualinverting input drivers, the MAX17601/MAX17604 aredual noninverting input drivers, and the MAX17602 /MAX17605 devices have one noninverting and oneinverting input. These devices are provided with enablepins (ENA, ENB) for better control of driver operation.
標(biāo)簽： 17600 MAX 數(shù)據(jù)資料
上傳時(shí)間： 2013-12-20
上傳用戶：zhangxin
The MAX4968/MAX4968A are 16-channel, high-linearity,high-voltage, bidirectional SPST analog switches with18I (typ) on-resistance. The devices are ideal for use inapplications requiring high-voltage SWITCHING controlledby a low-voltage control signal, such as ultrasound imagingand printers. The MAX4968A provides integrated40kI (typ) bleed resistors on each switch terminal todischarge capacitive loads. Using HVCMOS technology,these switches combine high-voltage bilateral MOSswitches and low-power CMOS logic to provide efficientcontrol of high-voltage analog signals.
標(biāo)簽： 4968 MAX 數(shù)據(jù)手冊(cè)
上傳時(shí)間： 2013-10-09
上傳用戶：yepeng139
Abstract: Class D amplifiers are typically very efficient, making them ideal candidates for portable applications that require longbattery life and low thermal dissipation. However, electromagnetic interference (EMI) is an issue that commonly accompanies theClass D SWITCHING topology. Active-emissions limiting reduces radiated emissions and enables "filterless" operation, allowingdesigners to create small, efficient portable applications with low EMI.
標(biāo)簽： EMI D類放大器 保持 便攜式產(chǎn)品
上傳時(shí)間： 2013-11-23
上傳用戶：哈哈hah
This paper presents a space vector modulation(SVM)-based SWITCHING strategy for a three-level neutral point clamped (NPC) converter that is adapted as a STATCOM.
標(biāo)簽： STATCOM 三電平 變換器 空間矢量
上傳時(shí)間： 2013-10-20
上傳用戶：zyt
Most circuit designers are familiar with diode dynamiccharacteristics such as charge storage, voltage dependentcapacitance and reverse recovery time. Less commonlyacknowledged and manufacturer specifi ed is diode forwardturn-on time. This parameter describes the timerequired for a diode to turn on and clamp at its forwardvoltage drop. Historically, this extremely short time, unitsof nanoseconds, has been so small that user and vendoralike have essentially ignored it. It is rarely discussed andalmost never specifi ed. Recently, SWITCHING regulator clockrate and transition time have become faster, making diodeturn-on time a critical issue. Increased clock rates aremandated to achieve smaller magnetics size; decreasedtransition times somewhat aid overall effi ciency but areprincipally needed to minimize IC heat rise. At clock speedsbeyond about 1MHz, transition time losses are the primarysource of die heating.
標(biāo)簽： 二極管 導(dǎo)通 開(kāi)關(guān)穩(wěn)壓器
上傳時(shí)間： 2013-10-10
上傳用戶：誰(shuí)偷了我的麥兜
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