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摘要: http://www.analog.com/zh/content/dc-to-dc_switching_regulator_insights/fca.html作者:Sridhar Gurram,Oliver Brennan,Tim Wilkerson引言长期以来,设计师一直面临着使MP3播放器、个人媒体播放器、数码相机和其它便携式消费电子设备满足高性能和低功耗的艰巨挑战。这些电池供电系统通常使用嵌入式数字信号处理器(DSP),以便在处理多媒体应用时提供最大的处理能力,在睡眠模式时达到最小的功耗。电池寿命是手持式电池供电产品的首要指标,因此这些产品的成功与否与电源系统的效率直接相关。DC/DC降 阅读全文
posted @ 2013-09-10 14:47 IAmAProgrammer 阅读(1300) 评论(0) 推荐(0) 编辑
摘要: 【TI博客大赛】【原创】LM3S811之基于PWM的DAChttp://bbs.ednchina.com/BLOG_ARTICLE_3005301.HTMhttp://www.fpga4fun.com/PWM_DAC_3.htmlOne-bit DACTake one pin of an FPGA, connect a speaker and listen to an MP3? Easy.Here, we'll use a PC to decode an MP3, and then send the decoded data to an FPGA that is configured 阅读全文
posted @ 2013-09-10 14:06 IAmAProgrammer 阅读(10409) 评论(0) 推荐(0) 编辑
摘要: http://www.cnblogs.com/westsource/archive/2012/12/26/2834876.htmlIf you have Windows Server 2012 iso file or DVD,you can install .net framework 3.5 on Windows Server 2012 easly.1. You have to insertWindows Server 2012 DVD or isoto D drive.2. Open Add Roles and Features Wizard3. Select .NET Framework 阅读全文
posted @ 2013-09-10 07:44 IAmAProgrammer 阅读(393) 评论(0) 推荐(0) 编辑
摘要: 第二版STM32 + RA8875 + AT070TN92 + 触摸屏 + USB + C++...http://www.amobbs.com/thread-5510972-1-1.html 阅读全文
posted @ 2013-09-09 22:24 IAmAProgrammer 阅读(2384) 评论(0) 推荐(0) 编辑
摘要: http://blog.csdn.net/maxwoods/article/details/8842889XE4 Update1 下载:http://altd.embarcadero.com/download/radstudio/xe4/delphicbuilder_xe4_upd1_win.iso安装序列号:MNFA-A3D8PK-F4BBAE-FCQN破解补丁(杀毒软件可能会误报哦):http://www.400gb.com/file/23544228安装指导:1.用上面的序列号安装,启动Rad Studio XE 4然后关闭2.打开Rad Studio XE 4安装目录,参考如下(请根据 阅读全文
posted @ 2013-09-09 21:58 IAmAProgrammer 阅读(1603) 评论(0) 推荐(0) 编辑
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posted @ 2013-09-09 14:55 IAmAProgrammer 阅读(526) 评论(0) 推荐(0) 编辑
摘要: http://www.ti.com/lit/an/slva299a/slva299a.pdfMany boost converters have an external rectifier diode.The input voltage of the TPS61170 main boostconve... 阅读全文
posted @ 2013-09-09 14:52 IAmAProgrammer 阅读(696) 评论(0) 推荐(0) 编辑
摘要: Variable Control Voltage Output Voltage AdjustThis method is accomplished by connecting a variable control voltage througha resistor, R(adjust), to J3−1. The equations provided below calculate R2 andR(adjust) where:For example, if VO,max= 19 V, VO,min = 17 V, V(adjust),min = 0 V, V(adjust),max =3.3 阅读全文
posted @ 2013-09-09 00:28 IAmAProgrammer 阅读(1182) 评论(0) 推荐(0) 编辑
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posted @ 2013-09-08 23:31 IAmAProgrammer 阅读(1362) 评论(0) 推荐(0) 编辑
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posted @ 2013-09-08 10:02 IAmAProgrammer 阅读(652) 评论(0) 推荐(0) 编辑
摘要: The layers themselves are grouped by their functional types:Signal Layers– Top Layer, Bottom Layer, Mid-Layer 1-30Internal Planes– Internal Plane 1-16Other Layers– Drill Guide, Keep-Out Layer, Drill Drawing, Multi-LayerSilkscreen Layers– Top Overlay, Bottom OverlayMask Layers– Top Paste, Bottom Past 阅读全文
posted @ 2013-09-06 10:21 IAmAProgrammer 阅读(1873) 评论(0) 推荐(0) 编辑
摘要: http://www.centralsemi.com/product/packages/index2.phphttp://www.infineon.com/cms/cn/product/package.html?package=%2fpackages%2fSMD_-_Surface_Mounted_Deviceshttp://www.838dz.com/diode/1100.htmhttp://www.nxp.com/packages/http://www.ti.com/sc/docs/package/guide.htmhttp://www.linear.com/designtools/pac 阅读全文
posted @ 2013-09-05 21:50 IAmAProgrammer 阅读(358) 评论(0) 推荐(0) 编辑
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posted @ 2013-09-05 20:45 IAmAProgrammer 阅读(1224) 评论(0) 推荐(0) 编辑
摘要: Single Inductor Buck-Boost Converter in Tiny WCSPThe TPS63036 is a non inverting buck-boost converter able to provide a regulated output voltage from an input supply that can be higher or lower than the output voltage. The buck-boost converter is based on a fixed frequency, pulse-width-modulation (P 阅读全文
posted @ 2013-09-03 16:55 IAmAProgrammer 阅读(1693) 评论(0) 推荐(0) 编辑
摘要: http://wiki.altium.com/pages/viewpage.action?pageId=3080344Land Pattern InformationDensity Level A: Maximum (Most) Land Protrusion- For low-density product applications, the 'maximum' land pattern condition has been developed to accommodate wave or flow solder of leadless chip devices and le 阅读全文
posted @ 2013-08-30 15:51 IAmAProgrammer 阅读(3533) 评论(0) 推荐(0) 编辑
摘要: http://en.wikipedia.org/wiki/Surface-mount_technologySurface-mount technology(SMT) is a method for producingelectroniccircuits in which the components are mounted or placed directly onto the surface ofprinted circuit boards(PCBs).An electronic device so made is called asurface-mount device(SMD).In t 阅读全文
posted @ 2013-08-30 13:04 IAmAProgrammer 阅读(33885) 评论(0) 推荐(0) 编辑
摘要: http://digital.ni.com/public.nsf/allkb/4B99B2CD6C0C3B6A86257205005D58E0Error: Time Step Too Small in MultisimPrimary Software:Electronics Workbench>>MultisimPrimary Software Version:9.xPrimary Software Fixed Version:N/ASecondary Software:N/AProblem:I receive the following error:Time Step Too S 阅读全文
posted @ 2013-08-29 13:48 IAmAProgrammer 阅读(1025) 评论(0) 推荐(0) 编辑
摘要: http://www.ozenelektronik.com/downs/pdf/oe90c2600.pdfFeatures • Compatible with EOBD/OBDII standard • Communication at 9600 Baud • OBDII / EOBD Modes 1..9 • ISO9141 • KWP2000 • J1850 VPWM and PWM • CAN Bus • Multiple response from multiple ECU • Physical and fonctional addressing Description OBDII i 阅读全文
posted @ 2013-08-29 11:21 IAmAProgrammer 阅读(1167) 评论(0) 推荐(0) 编辑
摘要: http://www.obdsol.com/stn1110/Safe, secure bootloader.Reflash the firmware in the field, even over a poor quality link and avoid expensive product recalls.Fully compatible with ELM327 command set,ensuring out-of-the-box compatibility with the dozens of existing software applications.Extended “ST” co 阅读全文
posted @ 2013-08-29 11:08 IAmAProgrammer 阅读(1868) 评论(0) 推荐(0) 编辑
摘要: http://www.obdsol.com/stn1170/STN1170 supports the following protocols:all legislated OBD II protocols:ISO 15765-4 (CAN)ISO 14230-4 (Keyword Protocol 2000)ISO 9141-2 (Asian, European, Chrysler vehicles)SAE J1850 VPW (GM vehicles)SAE J1850 PWM (Ford vehicles)non-legislated OBD protocols:Single Wire C 阅读全文
posted @ 2013-08-29 10:54 IAmAProgrammer 阅读(1888) 评论(0) 推荐(0) 编辑
摘要: http://faq.ford77.ru/pdf/eec/DataSheet.pdfFEATURES:Operating Voltage 5.0 VOperating Current 5 Ma. TypClock: 20 MHzInputs: (0-5V levels)Serial Input (19200 Baud)PWM receiveVPW receiveISO 9141-2Outputs (0-5V levels)Serial output (19200 Baud)PWM transmit bus+ (inverted)PWM transmit bus- (inverted)VPW t 阅读全文
posted @ 2013-08-29 10:45 IAmAProgrammer 阅读(1835) 评论(0) 推荐(0) 编辑
摘要: http://elmelectronics.com/DSheets/ELM327DS.pdf 阅读全文
posted @ 2013-08-29 10:42 IAmAProgrammer 阅读(597) 评论(0) 推荐(0) 编辑
摘要: http://elmelectronics.com/DSheets/ELM323DS.pdf 阅读全文
posted @ 2013-08-29 10:35 IAmAProgrammer 阅读(494) 评论(0) 推荐(0) 编辑
摘要: http://elmelectronics.com/DSheets/ELM322DS.pdf 阅读全文
posted @ 2013-08-29 10:33 IAmAProgrammer 阅读(580) 评论(0) 推荐(0) 编辑
摘要: http://elmelectronics.com/DSheets/ELM320DS.pdf 阅读全文
posted @ 2013-08-29 10:31 IAmAProgrammer 阅读(678) 评论(0) 推荐(0) 编辑
摘要: http://www.amobbs.com/forum.php?mod=viewthread&tid=3661385&page=3#pid3803226对R13 R16 R17做星-三角变换:RAB = R13 + R17 + R13 * R17 / R16 = 4.63KRBC = R16 + R17 + R16 * R17 / R13 = 14.03KRCA = R13 + R16 + R13 * R16 / R17 = 46.3K变换后RAB固定接于5V和地之间,可忽略。Vpwm变化范围0-5V,根据虚短原理,C点电压变化范围也是0-5V。现在问题变成:A = 5V,B 阅读全文
posted @ 2013-08-28 07:37 IAmAProgrammer 阅读(975) 评论(0) 推荐(0) 编辑
摘要: http://electronicdesign.com/power/simple-addition-permits-voltage-control-dc-dc-converters-outputIn a standard dc-dc converter, a resistor divider typically defines a fixed output voltage. However, applications like programmable output voltage power supplies and motor control circuits require dynami 阅读全文
posted @ 2013-08-27 14:28 IAmAProgrammer 阅读(602) 评论(0) 推荐(0) 编辑
摘要: http://electronicdesign.com/print/passives/fixed-dc-dc-regulator-output-uses-digitally-controlled-potentiometerElectronic DesignTamara SchmitzThu, 2009-10-01 (All day)Digitally controlled potentiometers (DCPs) have become very popular in a wide variety of applications, including control, parameter a 阅读全文
posted @ 2013-08-27 14:19 IAmAProgrammer 阅读(773) 评论(0) 推荐(0) 编辑
摘要: http://blog.csdn.net/star_splendid/article/details/6939063自己机子更新的话,速度1KB/s 实在是等不及了~找方法吧http://www.opensoce.com/?p=3035这个上面看到 下载地址:我是更新 版本是 15 (其他的换个数字 就好了)对应的地址就是:https://dl-ssl.google.com/android/repository/tools_r15-windows.zip把他下载到你sdk 目录 temp文件夹下的。先用 sdk manager 更新,选择安装,之后在sdk 目录 temp 文件夹下,就会出现. 阅读全文
posted @ 2013-08-26 16:22 IAmAProgrammer 阅读(3672) 评论(0) 推荐(0) 编辑
摘要: http://bbs.csdn.net/topics/1200795651、PATH,这个是给WINDOWS操作系统用的,告诉命令行里,执行的命令行工具在那里,比如java,javac这都是命令行工具,你在运行里随便敲一个命令,操作系统怎么就知道你这个命令对应的程序在什么地方,就是通过PATH知道的,你编写JAVA程序的时候,需要编译你的代码,执行编译后的代码,用JAVA和JAVAC这2个工具,那么就必须告诉操作系统,这2个工具放在什么地方。2、JAVA_HOME,是告诉操作系统,JAVAC和JAVA的具体位置的,因为你安装JAVA的路径可能比较长,不方便在PATH里面写,所以就等于是声明一个 阅读全文
posted @ 2013-08-26 15:53 IAmAProgrammer 阅读(352) 评论(0) 推荐(0) 编辑
摘要: 电阻的标称阻值分为E6、E12、E24、E48、E96、E192系列E6系列电阻标称阻值,对应允许偏差为±20%,标称值只能是:1.0、2. 2、3.3、4.7、6.8E12系列电阻标称阻值,对应允许偏差为±10%,1.0、1.5、 2.2、2.7、3.3、3.9、4.7、5.6、8.2E24系列电阻标称阻值,对应允许偏差为±5%,1.0、1.1、1.2、1.3、1.5、1.6、1.8、2.0、2.2、2.4、2.7、3.0、3.3、3.6、3.9、4.3、4.7、5.1、5.6、6.2、6.8、7.5、8.2、9.1E48系列电阻标称阻值,对应允许偏差为 阅读全文
posted @ 2013-08-26 13:15 IAmAProgrammer 阅读(56558) 评论(0) 推荐(0) 编辑
摘要: DIGITALLY ADJUSTABLE BOOST CONVERTERThe TPS61045 is a high frequency boost converter with digitally programmable output voltage and true shutdown. During shutdown, the output is disconnected from the input by opening the internal input switch. This allows a controlled power up/down sequencing of the 阅读全文
posted @ 2013-08-25 21:06 IAmAProgrammer 阅读(888) 评论(0) 推荐(0) 编辑
摘要: http://www.powerguru.org/changing-the-output-voltage-of-a-switching-regulator-on-the-fly/There are many different ways to change the output voltageApplications that require the output voltage of a power supply to change dynamically come from a wide variety of areas. Examples are sensor applications 阅读全文
posted @ 2013-08-25 19:31 IAmAProgrammer 阅读(952) 评论(0) 推荐(0) 编辑
摘要: As shown in figure 3.4, PWM controller contains two main parts;voltage error-amplifier and voltage comparator. The error-amplifier compares the feedback voltage VF (applied to inverting input) to reference voltage VREF (applied to non-inverting input) then their difference which is called voltage er 阅读全文
posted @ 2013-08-25 19:26 IAmAProgrammer 阅读(1133) 评论(0) 推荐(0) 编辑
摘要: GENERAL DESCRIPTION The AX5511 is a current mode step up converter intended for small, low powerapplications. The converter input voltage ranging from 2.6V to 5.5V. The Output voltage can be set up to 27V. The frequency is 1.2MHz allows the use of small external inductors and capacitors and provides 阅读全文
posted @ 2013-08-25 19:07 IAmAProgrammer 阅读(377) 评论(0) 推荐(0) 编辑
摘要: http://www.edn.com/design/analog/4363990/Control-an-LM317T-with-a-PWM-signalThe LM317T from NationalSemiconductor is a popular adjustable-voltageregulator thatprovides output voltagesof 1.25 to 37V with maximum 1.5Acurrent. You can adjust the outputvoltagewith a potentiometer. The circuit inFigure 1 阅读全文
posted @ 2013-08-25 18:53 IAmAProgrammer 阅读(1959) 评论(0) 推荐(0) 编辑
摘要: The LM27313 switching regulator is a current-mode boost converter with a fixed operating frequency of 1.6 MHz.The use of the SOT-23 package, made possible by the minimal losses of the 800 mA switch, and small inductors and capacitors result in extremely high power density. The 30V internal switch ma 阅读全文
posted @ 2013-08-25 18:16 IAmAProgrammer 阅读(802) 评论(0) 推荐(0) 编辑
摘要: http://bbs.kechuang.org/read-kc-tid-9837-page-e.html摘要:本文介绍了一种性价比高、功能丰富的程控开关电源的设计,对基于LM2576控制核心的升、降压电路设计、切换及恒流输出电路进行了详细介绍。性能测试结果验证了本设计的有效性及实用性。关键词:开关电源;多功能;LM2576引言随着电源技术的飞速发展,开关电源以其功耗小、体积小、重量轻等优点得到了广泛的应用。目前开关电源也正在朝着集成化与多功能化的方向发展。本文以大学生电子设计竞赛为背景,介绍一种性价比高、功能较强的实用开关电源设计方案。竞赛内容为设计具有单路恒压输出功能的开关电源,输出电压范围 阅读全文
posted @ 2013-08-25 00:02 IAmAProgrammer 阅读(1815) 评论(0) 推荐(0) 编辑
摘要: http://www.electronic-products-design.com/geek-area/electronics/mosfets/using-mosfets-as-general-switchesUsing this back to back arrangement of P Chan... 阅读全文
posted @ 2013-08-24 17:38 IAmAProgrammer 阅读(7758) 评论(0) 推荐(0) 编辑
摘要: 双向可控硅工作原理与特点从理论上来讲,双向可控硅可以说是有两个反向并列的单向可控硅组成,理解单向可控硅的工作原理是理解双向可控硅工作原理的基础单向可控硅单向可控硅也叫晶闸管,其组成结构图如图1-a所示,可以分割成四个硅区P、N、P、N和A、K、G三个接线极。把图一按图1-b 所示切成两半,就很容易理解成如图1-c所示由一个PNP三极管和一个NPN三极管为主组成一个单向可控硅管。在图1-c的基础上接通电源控制电路如图2所示,当阳极-阴极(A-K)接上正向电压V后,只要栅极G接通触发电源Vg,三极管Q2就会正向导通,开通瞬间Q1只是类似于接在Q1集电极的一个负载与电源正极接通,随后Q1也在Q2的拉 阅读全文
posted @ 2013-08-24 12:43 IAmAProgrammer 阅读(9404) 评论(0) 推荐(0) 编辑
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