Alkaline batteries are convenient because they’re easy tofi nd and relatively inexpensive, making them the powersource of choice for portable instruments and devicesused for outdoor recreation. Their long shelf life alsomakes them an excellent choice for emergency equipmentthat may see infrequent use but must be ready to go on amoment’s notice. It is important that the DC/DC convertersin portable devices operate over the widest possiblebattery voltage range to extend battery run time, and thussave the user from frequent battery replacement.
上传时间： 2014-12-24
上传用户：569342831
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.
上传时间： 2013-11-23
上传用户：新手无忧
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.
上传时间： 2013-10-09
上传用户：Jerry_Chow
An essential component of a noise-free audio device isa clean power supply, but few switching regulators canoperate at high efficiency while keeping the switchingfrequency out of the audio band. The LTC®3620 fills thisvoid. It is a high efficiency 15mA buck regulator with aprogrammable minimum switching frequency, making itpossible to virtually eliminate audible switching noise. Theinternal synchronous switches and low quiescent currentof this buck regulator provide the ability to maintain highefficiency, while its small footprint makes it ideal for tiny,low power audio applications.
上传时间： 2013-10-21
上传用户：非衣2016
数字电压表是大学物理教学和实验中的重要仪表，其数字化是指将连续的模拟电压量转换成不连续、离散的数字量并加以显示。传统的实验用模拟电压表功能单一、精度低、体积大，且存在读数时的视差，长时间连续使用易引起视觉疲劳，使用中存在诸多不便。而目前数字万用表的内部核心多是模/数转换器，其精度很大程度上限制了整个表的准确度，可靠性较差。
上传时间： 2013-10-16
上传用户：牛津鞋
As logic systems get larger and more complex, theirsupply current requirements continue to rise. Systemsrequiring 100A are fairly common. A high current powersupply to meet such requirements usually requires parallelingseveral power regulators to alleviate the thermalstress on the individual power components. A powersupply designer is left with the choice of how to drive theseparalleled regulators: brute-force single-phase or smartPolyPhaseTM.
上传时间： 2013-10-08
上传用户：zhqzal1014
Photomultipliers (PMT), avalanche photodiodes (APD),ultrasonic transducers, capacitance microphones, radiationdetectors and similar devices require high voltage,low current bias. Additionally, the high voltage must bepristinely free of noise; well under a millivolt is a commonrequirement with a few hundred microvolts sometimesnecessary. Normally, switching regulator confi gurationscannot achieve this performance level without employingspecial techniques. One aid to achieving low noise is thatload currents rarely exceed 5mA. This freedom permitsoutput fi ltering methods that are usually impractical
上传时间： 2013-10-28
上传用户：lhw888
The design of battery-powered equipment can often bequite challenging. Since few ICs can operate directly fromthe end-of-life voltage from a 2-cell battery (about 1.8V),most systems require a DC/DCconverter. The systemdesigner often has a limited area in which to place the DC/DC converter; associated inductors and capacitors must be
上传时间： 2013-11-23
上传用户：wys0120
电源待机能耗规范术语解释： 静态待机模式是指产品被关闭不执行任何常规功能但仍然与电源连接的空载状态,此时仅为低功耗微控制器和唤醒电路供电。比如有唤醒功能的电脑等电子产品，该微功耗电源在静态待机状态下功耗小于6mW，比能源之星静态待机功耗2.0和EuP标(300mW)还要低50倍，这么低的静态待机功耗世界无与伦比。 动态待机模式是指产品在开启并处于执行常规功能时的状态,此时为主IC控制器、接收器和开关机驱动电路供电。比如有遥控功能的电视机等电子产品，该微功耗电源在动态待机状态下功耗小于50mW，比能源之星静态待机功耗2.0和EuP标(300mW)还要低6倍，这么低的动态待机功耗世界无与伦比。
上传时间： 2013-11-25
上传用户：asasasas
说明：单排直插（SIP）封装或双排直插DIP（封装）,任意值电压输入转换出任意值电压输出，精度为±2%或±3%.简说：DC/DC定电压隔离双隔离（输入/输出隔离、两路输出之间也隔离,双输出,两路正压或两路负压及或一正一负）转换器,输出共同一地线,瞬变响应快,极低纹波噪声输出，无需任何外围元件即可工作，脚位采用7PIN单列,14PIN双列直插，小型封装。应用：便携仪表,医学仪表,自控装置,防盗报警器,手持仪表,通讯设备等数字电路。
上传时间： 2013-10-31
上传用户：qq527891923
