高的工作電壓高達(dá)100V N雙N溝道MOSFET同步驅(qū)動(dòng) The D810DCDC is a synchronous step-down switching regulator controller that can directly step-down voltages from up to 100V, making it ideal for telecom and automotive applications. The D810DCDC uses a constant on-time valley current control architecture to deliver very low duty cycles with accurate cycle-by-cycle current limit, without requiring a sense resistor. A precise internal reference provides 0.5% DC accuracy. A high bandwidth (25MHz) error amplifi er provides very fast line and load transient response. Large 1Ω gate drivers allow the D810DCDC to drive multiple MOSFETs for higher current applications. The operating frequency is selected by an external resistor and is compensated for variations in VIN and can also be synchronized to an external clock for switching-noise sensitive applications. Integrated bias control generates gate drive power from the input supply during start-up and when an output shortcircuit occurs, with the addition of a small external SOT23 MOSFET. When in regulation, power is derived from the output for higher effi ciency.
上傳時(shí)間： 2013-10-24
上傳用戶：wd450412225
While simplicity and high effi ciency (for cool running) areno longer optional features in isolated power supplies, itis traditionally diffi cult to achieve both. Achieving higheffi ciency often requires the use of advanced topologiesand home-brewed secondary synchronous rectifi cationschemes once reserved only for higher power applications.This only adds to the parts count and to the designcomplexity associated with the reference and optocouplercircuits typically used to maintain isolation. Fortunately, abreakthrough IC makes it possible to achieve both high efficiency and simplicity in a synchronous fl yback topology.The LT®3825 simplifi es and improves the performance oflow voltage, high current fl yback supplies by providingprecise synchronous rectifi er timing and eliminating theneed for optocoupler feedback while maintaining excellentregulation and superior loop response.
上傳時(shí)間： 2013-10-16
上傳用戶：wayne595
Video cable driver amplifi er output stages traditionallyrequire a supply voltage of at least 6V in order to providethe required output swing. This requirement is usuallymet with 5V supplies by adding a boost regulator or asmall local negative rail, say via the popular LT®1983-3.Such additional circuitry is unnecessary in typical 1VP-Pvideo connections, such as HD component video, if thecable driver amplifi ers simply offer near rail-to-rail outputcapability when powered from 5V.
上傳時(shí)間： 2013-11-16
上傳用戶：yanyangtian
Avalanche photo diode (APD) receiver modules arewidely used in fi ber optic communication systems. AnAPD module contains the APD and a signal conditioningamplifi er, but is not completely self contained. It stillrequires signifi cant support circuitry including a highvoltage, low noise power supply and a precision currentmonitor to indicate the signal strength. The challenge issqueezing this support circuitry into applications withlimited board space. The LT®3482 addresses this challengeby integrating a monolithic DC/DC step-up converter andan accurate current monitor. The LT3482 can supportup to a 90V APD bias voltage, and the current monitorprovides better than 10% accuracy over four decades ofdynamic range (250nA to 2.5mA).
上傳時(shí)間： 2014-01-18
上傳用戶：wenyuoo
TDK公司的子公司TDK-EPC推出了愛普科斯PQ鐵氧體磁芯的擴(kuò)展系列。新加入了PQ40/40和PQ50/50磁芯后，PQ磁芯系列覆蓋了PQ16/11.6至PQ50/50的全部尺寸。 PQ磁芯專為開關(guān)電源的變壓器研制。這些磁芯的插入高度可以調(diào)節(jié)，同時(shí)可以通過適當(dāng)調(diào)整磁芯保存相同的占用面積。新款鐵氧體磁芯可用于AC/DC和DC/DC轉(zhuǎn)換器中的標(biāo)準(zhǔn)繞線變壓器以及平面變壓器。 與傳統(tǒng)ETD/er/E磁芯設(shè)計(jì)相比，PQ磁芯的主要優(yōu)勢(shì)在于擁有穩(wěn)定的圓形中心支腳和更大的外表面。憑借該圓形中心支腳和更大的繞組表面積，銅線的長度得以縮短。因此，變壓器生產(chǎn)的成本也得以降低。此外，更大的外表面可以保證更好的散熱。PQ磁芯外形經(jīng)過優(yōu)化，從而可以更小的尺寸和重量獲得與e磁芯相同的變壓器性能。PQ磁芯可由多種鐵氧體材料制成，如：N49、N51、N87、N92、N95和N97。
標(biāo)簽： 鐵氧體 PQ芯 產(chǎn)品系列 擴(kuò)展
上傳時(shí)間： 2013-11-10
上傳用戶：zgu489
此系統(tǒng)是一個(gè)專門為一個(gè)童裝行業(yè)客戶做的。。“產(chǎn)品”進(jìn)銷存系統(tǒng)，只是對(duì)產(chǎn)品，沒有對(duì)原料。。。 系統(tǒng)模塊主要分 基本資料 _客戶資料 _產(chǎn)品資料 _產(chǎn)品組別 _款式資料 ...... 業(yè)務(wù)管理 _成品入庫 _生產(chǎn)退貨 _客戶送貨 -客戶退貨 _....... 報(bào)表統(tǒng)計(jì) -銷售情況 _進(jìn)銷存日?qǐng)?bào) .... 系統(tǒng)管理 _用戶管理 _.... 其中....沒有寫出來，，請(qǐng)下載后自己后。。 后臺(tái)數(shù)據(jù)庫用的是er/studio設(shè)計(jì),先寫成C/S結(jié)構(gòu),等完成了后，(拿到MONEY后)就將其加進(jìn)原料進(jìn)銷存...生產(chǎn)管理..等，請(qǐng)各位關(guān)注，，并提出建議......謝謝!
標(biāo)簽： 進(jìn)銷存系統(tǒng)
上傳時(shí)間： 2015-03-14
上傳用戶：gaojiao1999
Nand Flash Translation Layer 用于nandflash的操作。 bad block memory map garbage collection average erase
標(biāo)簽： Translation collection nandflash average
上傳時(shí)間： 2014-07-02
上傳用戶：lingzhichao
試題庫管理系統(tǒng)的需求規(guī)格說明文擋，包括詳細(xì)的需求分析，er圖分析等內(nèi)容。
標(biāo)簽： 試題庫 管理系統(tǒng) 規(guī)格
上傳時(shí)間： 2015-10-14
上傳用戶：gundamwzc
網(wǎng)絡(luò)考試系統(tǒng)旨在實(shí)現(xiàn)考試的無紙化管理，對(duì)一些科目的考試可以通過互聯(lián)網(wǎng)絡(luò)或局域網(wǎng)進(jìn)行，方便校方考務(wù)的管理，也方便了考生，尤其適合考生分布廣，不易集中的遠(yuǎn)程教育。本系統(tǒng)包括系統(tǒng)管理、考生管理、在線考試、在線制作試卷、控制學(xué)生考試、試卷審批中心等功能。本論文主要介紹了系統(tǒng)的分析，設(shè)計(jì)和開發(fā)的全部過程。運(yùn)用數(shù)據(jù)流圖，er圖，程序流程圖等對(duì)系統(tǒng)的設(shè)計(jì)過程進(jìn)行詳細(xì)的說明。全文共分為前言、需求分析、系統(tǒng)設(shè)計(jì)、開發(fā)技術(shù)、關(guān)鍵技術(shù)解決，結(jié)論六部分。西統(tǒng)采用B/S開發(fā)模式，開發(fā)工具選擇JAVA、JSP、Javas cript、Html語言，采用Tomcat服務(wù)器技術(shù)，后臺(tái)數(shù)據(jù)庫選用SQL Server 2000。
標(biāo)簽： 網(wǎng)絡(luò)考試 無紙化管理
上傳時(shí)間： 2013-12-20
上傳用戶：iswlkje
This paper examines the asymptotic (large sample) performance of a family of non-data aided feedforward (NDA FF) nonlinear least-squares (NLS) type carrier frequency estimators for burst-mode phase shift keying (PSK) modulations transmitted through AWGN and flat Ricean-fading channels. The asymptotic performance of these estimators is established in closed-form expression and compared with the modified Cram`er-Rao bound (MCRB). A best linear unbiased estimator (BLUE), which exhibits the lowest asymptotic variance within the family of NDA FF NLS-type estimators, is also proposed.
標(biāo)簽： performance asymptotic examines non-data
上傳時(shí)間： 2015-12-30
上傳用戶：225588
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