反激式轉換器通常應用於具有多個輸出電壓並要求中低輸出功率的電源。配合采用一個反激式轉換器，多輸出僅增加極少的成本或復雜度––– 每個額外的輸出僅要求另一個變壓器繞組、整流器和輸出濾波電容器。
上傳時間： 2013-11-22
上傳用戶：3294322651
ThinQ!™ SiC 二極管的模塊時代 600V / 1200V / 1700V –部分產品 應用
上傳時間： 2013-11-16
上傳用戶：yzy6007
Many system designers need an easy way to producea negative 3.3V power supply. In systems that alreadyhave a transformer, one option is to swap out the existingtransformer with one that has an additional secondarywinding. The problem with this solution is that manysystems now use transformers that are standard, offthe-shelf components, and most designers want toavoid replacing a standard, qualifi ed transformer with acustom version. An easier alternative is to produce thelow negative voltage rail by stepping down an existingnegative rail. For example, if the system already employsan off-the-shelf transformer with two secondary windingsto produce ±12V, and a –3.3V rail is needed, a negativebuck converter can produce the –3.3V output from the–12V rail.
上傳時間： 2013-10-09
上傳用戶：Jerry_Chow
Linear Technology’s DC/DC step-down μModule®regulators are complete switchmode power supplies in asurface-mount package. They include the DC/DC controller,inductor, power switches and supporting circuitry.These highly integrated regulators also provide an easysolution for applications that require negative outputvoltages. In other words, these products can operate asinverting buck-boost regulators. As a result, the lowestpotential in the circuit is not the standard 0V, but –VOUT,which must be tied to the μModule regulator’s GND. Allsignals are now referred to –VOUT.
上傳時間： 2013-10-22
上傳用戶：ztj182002
眾所周知, 每個數碼系統之所以正常準確工作的基礎是其心臟 – 時鐘序列的無誤. 而用來產生時鐘信號的資源有許多種: 系統主芯片輸出時鐘信號, 以MCU微處理器來產生時鐘, 以成本較低的晶振來產生時鐘信號, 但是還是有很多人不知道或不了解我們還有另外一個選擇:用一個集成電路PPL(鎖相環)時鐘芯片. 即使有人用過類似的時鐘芯片, 但是卻不知道我們現在已經有了性價比較高的LW系列芯片!
上傳時間： 2013-11-19
上傳用戶：yupw24
nios ii 入門手冊中文版 一、建立quartus ii工程 首先，雙擊quartus ii 9.1圖標打開軟件，界面如下圖1.1所示 1.1 新建工程 （1） 點擊file –>New Project Wizard 出現圖1.2所示的對話框。 （2） 點擊Next。如圖1.3所示：第一行是工程的路徑，二、三行為實體名。填好后點擊Next。 （3）此處可選擇加入已設計好的文件到工程，點擊Next。 （4）選擇設計器件如圖1.5所示。接著點擊Next （5）接著點擊Next。無需改動，點擊finish，顯示如下圖所示。 （6）此時，工程已經建立完成，接下來需要建立一個原理圖輸入文件，點擊file –>New ->Block Diagram/Schematic File 后如圖所示。
上傳時間： 2014-12-25
上傳用戶：cx111111
歐姆龍plc編程軟件CX-Programmer使用手冊 第一章安裝和啟動 1. 安裝 1-1. 安裝CX-Programmer 1-2. 在線注冊 2. 打開新工程和設置設備型號 3. 打開新工程和設置設備型號 4. 主窗口 4-1.兼容SYSWIN軟件的按鍵分配 4-2. 段 4-3.刪除和顯示其他窗口 5.創建程序 5-1.常開接點的輸入 5-2.線圈的輸入 5-3.符號注釋的編輯 5-4.條注釋的輸入 5-5.常閉接點的輸入 5-6.元素注釋的輸入 5-7.上升沿微分接點的輸入 5-8.下降沿微分接點的輸入 5-9.向上垂線的輸入 5-10.向下垂線的輸入 5-11.高級指令的輸入1 - 字符串的輸入 5-12.高級指令的輸入1 - 有用的功能 5-13.輔助繼電器的輸入- 1.0 秒時鐘脈沖位 5-14.高級指令的輸入2 – 微分指令的輸入 5-15.或邏輯的條輸入 5-16.高級指令的輸入3 – 通過功能號來輸入 5-17.定時器指令的輸入 5-18.計數器指令的輸入 5-19.條的編輯…復制和粘貼 5-20. END指令的輸入 第二章在線/調試 1. 程序錯誤檢查(編譯) 2. 進入在線 3. 監視 4. 監視- 2 同時監視程序中多處位置 5. 監視- 3 以十六進制數監視 6. 監視- 4 查看窗口 7. 監視- 5 查看窗口的當前值修改和二進制數監視 8. 查看窗口的有用功能 9. 監視- 6 監視窗口- 2 10.監視- 7 以短條形式顯示 11.監視- 8 微分監視 12.強制為On/Off 13.強制-on/off 位的顯示列表 14.修改定時器的設定值 15.修改定時器的當前值 16.查找功能- 1 通過地址引用工具查找 17.查找功能- 2 梯形圖的折回查找 18.查找功能- 3 通過注釋的關鍵字來查找 19.查找功能- 4 進入條注釋 20.查找功能- 5 查找位地址 21.在線編輯 實用的功能 相關資料： 歐姆龍PLC編程軟件CX-Programmer7.1 簡體中文版
上傳時間： 2013-10-25
上傳用戶：84425894
HIGH SPEED 8051 μC CORE - Pipe-lined Instruction Architecture; Executes 70% of Instructions in 1 or 2 System Clocks - Up to 25MIPS Throughput with 25MHz System Clock - 22 Vectored Interrupt Sources MEMORY - 4352 Bytes Internal Data RAM (256 + 4k) - 64k Bytes In-System Programmable FLASH Program Memory - External Parallel Data Memory Interface – up to 5Mbytes/sec DIGITAL PERIPHERALS - 64 Port I/O; All are 5V tolerant - Hardware SMBusTM (I2CTM Compatible), SPITM, and Two UART Serial Ports Available Concurrently - Programmable 16-bit Counter/Timer Array with 5 Capture/Compare Modules - 5 General Purpose 16-bit Counter/Timers - Dedicated Watch-Dog Timer; Bi-directional Reset CLOCK SOURCES - Internal Programmable Oscillator: 2-to-16MHz - External Oscillator: Crystal, RC, C, or Clock - Real-Time Clock Mode using Timer 3 or PCA SUPPLY VOLTAGE ........................ 2.7V to 3.6V - Typical Operating Current: 10mA @ 25MHz - Multiple Power Saving Sleep and Shutdown Modes 100-Pin TQFP (64-Pin Version Available) Temperature Range: –40°C to +85°C
標簽： C8051F020
上傳時間： 2013-10-12
上傳用戶：lalalal
Digitemp Junior – An RS-232 Port-Powered Digital Thermometer Digitemp Jr. is a device that is designed to measure and report ambient temperature. When connected to an RS-232 port on any PC, it will periodically measure and report in ASCII form the ambient temperature in degrees Celsius. These temperature readings can be monitored with any terminal program. If the terminal program supports capture to disk, the temperature readings can be saved to disk for further analysis with a spreadsheet program or other data analysis tool. The simple ASCII output format of Digitemp Jr. makes it rel- atively easy to write custom software for receiving, recording, and analyzing ambient temperature data. Best of all, Digitemp Jr. requires no external power sup- plies or batteries. It is powered directly by the RS-232 port.
上傳時間： 2013-10-21
上傳用戶：baitouyu
Abstract: This application note discusses the development and deployment of 3G cellular femtocell base stations. The technicalchallenges for last-mile residential connectivity and adding system capacity in dense urban environments are discussed, with 3Gfemtocell base stations as a cost-effective solution. Maxim's 3GPP TS25.104-compliant transceiver solution is presented along withcomplete radio reference designs such as RD2550. For more information on the RD2550, see reference design 5364, "FemtocellRadio Reference Designs Using the MAX2550–MAX2553 Transceivers."
標簽： Base-Station Applications Single-Chip Transceiver
上傳時間： 2013-11-07
上傳用戶：songrui
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