雙DC-DC變換器
上傳時間： 2013-10-23
上傳用戶：woshiayin
DC-DC 模塊的電源紋波指標(biāo)是一項很重要的參數(shù)。干凈的電源是數(shù)字電路穩(wěn)定工作的前提，也是模擬器件的各項參數(shù)的重要保障。
上傳時間： 2013-10-31
上傳用戶：stvnash
發(fā)現(xiàn)并證明了在設(shè)計多路大電流DC-DC變換器時,如果對每個工作模塊進(jìn)行有效隔離可避免自激情況發(fā)生。這個發(fā)現(xiàn)可更好地指導(dǎo)設(shè)計大電流多路DC-DC變換器。
上傳時間： 2013-10-23
上傳用戶：stst
便攜式電子器件(如智能手機(jī)、GPS導(dǎo)航系統(tǒng)和平板電腦)的電源可以來自低壓太陽能電池板、電池或AC/DC電源。電池供電系統(tǒng)通常將電池串聯(lián)疊置以實(shí)現(xiàn)更高的電壓，但由于空間不足，此技術(shù)未必總是可行。開關(guān)轉(zhuǎn)換器使用電感的磁場來交替地存儲電能，并以不同電壓釋放至負(fù)載。因?yàn)閾p耗很低，所以開關(guān)轉(zhuǎn)換器是個不錯的高效率選擇。連接至轉(zhuǎn)換器輸出端的電容可減少輸出電壓紋波。升壓轉(zhuǎn)換器提供較高的輸出電壓；而應(yīng)用筆記AN-1125(如何運(yùn)用DC-DC降壓調(diào)節(jié)器)所討論的降壓轉(zhuǎn)換器則提供較低的輸出電壓。內(nèi)置FET作為開關(guān)的開關(guān)轉(zhuǎn)換器稱為開關(guān)調(diào)節(jié)器，需要外部FET的開關(guān)轉(zhuǎn)換器則稱為開關(guān)控制器。
標(biāo)簽： DC-DC 如何運(yùn)用 升壓調(diào)節(jié)器
上傳時間： 2013-11-04
上傳用戶：edisonfather
Advancements in board assembly, PCB layout anddigital IC integration have produced a new generationof densely populated, high performance systems. Theboard-mounted point-of-load (POL) DC/DC power suppliesin these systems are subject to the same demandingsize, high power and performance requirements asother subsystems. The rigorous new POL demands aredifficult to meet with traditional controller or regulatorICs, or power modules.
上傳時間： 2014-12-24
上傳用戶：lbbyxmraon
A number of conventional solutions have been available forthe design of a DC/DC converter where the output voltageis within the input voltage range—a common scenarioin Li-Ion battery-powered applications—but none werevery attractive until now. Conventional topologies, suchas SEPIC or boost followed by buck, have numerousdisadvantages, including low effi ciency, complex magnetics,polarity inversion and/or circuit complexity/cost. TheLTC®3785 buck-boost controller yields a simple, effi cient,low parts-count, single-converter solution that is easyto implement, thus avoiding the drawbacks associatedwith traditional solutions.
上傳時間： 2013-10-21
上傳用戶：ljt101007
Speed and accuracy don’t always go hand-in-handin DC/DC converter systems—that is, until now. TheLTC3811 is a dual output, fi xed frequency current modeDC/DC switching regulator controller designed for one oftoday’s most demanding power supply applications: highcurrent, low voltage processor core supplies.
上傳時間： 2013-11-21
上傳用戶：aix008
The LTM4601 DC/DC μModule regulator is a completehigh power density stepdown regulator for up to 12Acontinuous (14A peak) loads. The device is housed ina small 15mm ¥ 15mm ¥ 2.8mm LGA surface mountpackage, thus the large power dissipation is a challengein some applications. This thermal application note willprovide guidelines for using the μModule regulator inambient environments with or without air fl ow. Loadcurrent derating curves are provided for several inputvoltages and output voltages versus ambient temperatureand air fl ow.
上傳時間： 2013-10-19
上傳用戶：bakdesec
什么是DC/DC 轉(zhuǎn)換器? 什么是DC(Direct Current)呢?它表示的是直流電源，諸如干電池或車載電池之類。家庭用的100V電源是交流電源(AC) 。若通過一個轉(zhuǎn)換器能將一個直流電壓(3.0V)轉(zhuǎn)換成其他的直流電壓(1.5V或5.0V)，這個轉(zhuǎn)換器被稱為DC/DC轉(zhuǎn)換器或稱之為開關(guān)電源或開關(guān)調(diào)整器。 DC/DC轉(zhuǎn)換器一般由控制芯片，電感線圈，二極管，三極管，電容器構(gòu)成。 DC/DC轉(zhuǎn)換器為轉(zhuǎn)變輸入電壓后有效輸出固定電壓的電壓轉(zhuǎn)換器。DC/DC轉(zhuǎn)換器分為三類：升壓型DC/DC轉(zhuǎn)換器、降壓型DC/DC轉(zhuǎn)換器以及升降壓型DC/DC轉(zhuǎn)換器。根據(jù)需求可采用三類控制。PWM控制型效率高并具有良好的輸出電壓紋波和噪聲。PFM控制型即使長時間使用，尤其小負(fù)載時具有耗電小的優(yōu)點(diǎn)。PWM/PFM轉(zhuǎn)換型小負(fù)載時實(shí)行PFM控制，且在重負(fù)載時自動轉(zhuǎn)換到PWM控制。目前DC-DC轉(zhuǎn)換器廣泛應(yīng)用于手機(jī)、MP3、數(shù)碼相機(jī)、便攜式媒體播放器等產(chǎn)品中。
標(biāo)簽： DC 轉(zhuǎn)換器
上傳時間： 2014-12-24
上傳用戶：文993
When a system designer specifies a nonisolated dc/dc powermodule, considering the needed input voltage range isequally as important as considering the required performanceattributes and features. Generally, nonisolated moduleshave either a narrow or a wide input voltage range. Narrowinputmodules typically have a nominal input voltage of3.3, 5, or 12 V. For systems that operate from a tightlyregulated input bus—such as those that do not use batterybackup—a narrow-input module is often adequate sincethe input remains fairly stable.Offering greater flexibility, wide-input modules operatewithin a range of 7 to 36 V, which includes the popular12- or 24-V industrial bus. This enables a single module tobe used for generating multiple voltages. These modulesare ideal for industrial controls, HVAC systems, vehicles,medical instrumentation, and other applications that usea loosely regulated distribution bus. In addition, systemspowered by a rectifier/battery charger with lead-acidbattery backup almost always require wide-input modules.System designers who choose power supplies may wantto take a close look at the latest generation of wide-inputdc/dc modules.
標(biāo)簽： Wide-input modules offer dc
上傳時間： 2014-12-24
上傳用戶：dragonhaixm
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