Piezoelectric motors are used in digital cameras for autofocus,zooming and optical image stabilization. Theyare relatively small, lightweight and effi cient, but theyalso require a complicated driving scheme. Traditionally,this challenge has been met with the use ofseparatecircuits, including a step-up converter and an oversizedgeneric full-bridge drive IC. The resulting high componentcount and large board space are especially problematicin the design of cameras for ever shrinking cell phones.The LT®3572 solves these problems by combining astep-up regulator and a dual full-bridge driver in a 4mm× 4mm QFN package. Figure 1 shows a typical LT3572Piezo motor drive circuit. A step-up converter is usedto generate 30V from a low voltage power source suchas a Li-Ion battery or any input power source within thepart’s wide input voltage range of 2.7V to 10V. The highoutput voltage of the step-up converter, adjustable upto 40V, is available for the drivers at the VOUT pin. Thedrivers operate in a full-bridge fashion, where the OUTAand OUTB pins are the same polarity as the PWMA andPWMB pins, respectively, and the OUTA and OUTB pinsare inverted from PWMA and PWMB, respectively. Thestep-up converter and both Piezo drivers have their ownshutdown control. Figure 2 shows a typical layout
上傳時間： 2013-11-18
上傳用戶：hulee
Industrial remote monitoring systems and keep-alivecircuits spend most of their time in standby mode. Manyof these systems also depend on battery power, so powersupply effi ciency in standby state is very important tomaximize battery life. The LT®8410/-1 high effi ciencyboost converter is ideal for these systems, requiringonly 8.5μA of quiescent current in standby mode. Thedevice integrates high value (12.4M/0.4M) output feedbackresistors, signifi cantly reducing input current whenthe output is in regulation with no load. Other featuresinclude an integrated 40V switch and Schottky diode,output disconnect with current limit, built in soft-start,overvoltage protection and a wide input range, all in atiny 8-pin 2mm × 2mm DFN package.
標簽： 465 DN 超低功耗 升壓轉(zhuǎn)換器
上傳時間： 2013-11-23
上傳用戶：新手無憂
DC-link Automotive: MKP1849 (Customized)電動汽車電驅(qū)直流母線電容（顧客訂制品）MKP1849系列.MKP1849-可集成母線排，大大降低了寄生電感，提高了系統(tǒng)穩(wěn)定性。
上傳時間： 2013-10-13
上傳用戶：nanfeicui
The LTC®4155 and LTC4156 are dual multiplexed-inputbattery chargers with PowerPath™ control, featuring I2Cprogrammability and USB On-The-Go for systems suchas tablet PCs and other high power density applications.The LTC4155’s float voltage (VFLOAT) range is optimizedfor Li-Ion batteries, while the LTC4156 is optimized forlithium iron phosphate (LiFePO4)batteries, supportingsystem loads to 4A with up to 3.5A of battery chargecurrent. I2C controls a broad range of functions and USBOn-The-Go functionality is controlled directly from theUSB connector ID pin.
標簽： 高電流 便攜式產(chǎn)品 電池充電器 方案
上傳時間： 2013-10-09
上傳用戶：hanhanj
The latest generation of Texas Instruments (TI) boardmountedpower modules utilizes a pin interconnect technologythat improves surface-mount manufacturability.These modules are produced as a double-sided surfacemount(DSSMT) subassembly, yielding a case-less constructionwith subcomponents located on both sides of theprinted circuit board (PCB). Products produced in theDSSMT outline use the latest high-efficiency topologiesand magnetic-component packaging. This providescustomers with a high-efficiency, ready-to-use switchingpower module in a compact, space-saving package. Bothnonisolated point-of-load (POL) switching regulators andthe isolated dc/dc converter modules are being producedin the DSSMT outline.TI’s plug-in power product line offers power modules inboth through-hole and surface-mount packages. The surfacemountmodules produced in the DSSMT outline use asolid copper interconnect with an integral solder ball fortheir
上傳時間： 2013-10-10
上傳用戶：1184599859
使用二進制集成電路ＣＤ４０４０可制作電子電位器。ＣＤ４０４０集成電路各腳功能。電位可有４０９６擋次，如電壓在４．０９６Ｖ，每伏有１０００個１ｍＶ變化進位擋，每進１位上升１ｍＶ，電路二進制位０～１１位以高位電阻最小。如第１１位５０ｋΩ、第１０位１００ｋΩ、第９位２００ｋΩ、第８位４００ｋΩ、第７位８００ｋΩ、第６位１．６ＭΩ、第５位３．２ＭΩ、第４位６．４ＭΩ、第３位１２．８ＭΩ、第２位２５．６ＭΩ、第１位５１．２ＭΩ、第０位１０２．４ＭΩ，向下按每退１位、阻值加１倍順序排列。如排錯，或電阻不是倍數(shù)，電位的上升值會不均勻，進到某數(shù)值便突然跳變。
上傳時間： 2013-10-19
上傳用戶：dumplin9
一般電腦都有一個專用的電源排插。它上面插有電腦主機、顯示器、音箱、交換機等的電源插頭，但每次用完電腦后都得去關(guān)排插開關(guān)，很麻煩。為此筆者設(shè)計了一個電腦控制的自動開關(guān)。當關(guān)閉電腦時，它就自動把排插開關(guān)關(guān)了，并且，如果意外停電后再次來電時。那開關(guān)也是斷開的，從而保證電器的安全。
標簽： 自動 顯示器 電腦電源 自動開關(guān)
上傳時間： 2013-12-20
上傳用戶：dalidala
說明：單排直插（SIP）封裝或雙排直插DIP（封裝）,任意值電壓輸入轉(zhuǎn)換出任意值電壓輸出，精度為±2%或±3%.簡說：DC/DC定電壓隔離雙隔離（輸入/輸出隔離、兩路輸出之間也隔離,雙輸出,兩路正壓或兩路負壓及或一正一負）轉(zhuǎn)換器,輸出共同一地線,瞬變響應(yīng)快,極低紋波噪聲輸出，無需任何外圍元件即可工作，腳位采用7PIN單列,14PIN雙列直插，小型封裝。應(yīng)用：便攜儀表,醫(yī)學(xué)儀表,自控裝置,防盜報警器,手持儀表,通訊設(shè)備等數(shù)字電路。
標簽： DC-DC 模塊 電源應(yīng)用
上傳時間： 2013-10-31
上傳用戶：qq527891923
SMARTISYS IPPCI系列電源控制器是會議演示、指揮控制等系統(tǒng)中必不可少的設(shè)備。通過對應(yīng)用系統(tǒng)中所有設(shè)備的電源進行集中管理、定時、延時開關(guān)，以及對電動設(shè)備的程序化控制，能最大限度保護用電設(shè)備，極大的提高系統(tǒng)可靠性和使用方便性。 IPPCI系列產(chǎn)品有程序控制和手動控制兩種模式；在應(yīng)急情況下，可以通過手動方式對相關(guān)設(shè)備的電源直接進行開關(guān)控制及操作；在程序控制模式下，通TM過SmartControlBuilder編程進行任意獨立或組合控制。輸入采用4-pin專用網(wǎng)絡(luò)接線端子，用于直接給電源控制系統(tǒng)供電和發(fā)送控制信號；另外，還包括9-pin接線端子,用于連接8個本地輸入控制8路繼電器的開、關(guān)。
上傳時間： 2013-10-25
上傳用戶：wlcaption
Demonstration circuit 1562A is an engineering toolto design and evaluate the LTC699X-X family ofTimerBlox circuits. The center section of the boardcontains a pre-configured TimerBlox function.DC1562A comes in twelve timing function variationsas outlined in Table 1.Surrounding the center board is a ”playground”prototyping area. The prototyping area has padsfor Dip-8, S8, MS8, or S6 packages with breadboarding connections to each pin and two convenientpower buses and ground bus surrounding theentire area. This area is for conditioning signals tocontrol the timer function and for adding loads controlled in time.
上傳時間： 2013-10-18
上傳用戶：如果你也聽說
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