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
Today’s computer, datacom, and telecom systems demandpower supplies that are effi cient, respond quicklyto load transients and accurately regulate the voltageat the load. For example, load current can be measuredby using the inductor DCR, thus eliminating the needfor a dedicated sense resistor. Inductor DCR sensingincreases effi ciency—especially at heavy load—whilereducing component cost and required board space.The LTC®3856 single-output 2-phase synchronous buckcontroller improves the accuracy of inductor DCR sensingby compensating for changes in DCR due to temperature.
上传时间： 2013-11-05
上传用户：guobing703
High voltage buck DC/DC controllers such as the LTC3890(dual output) and LTC3891 (single output) are popular inautomotive applications due to their extremely wide 4V to60V input voltage range, eliminating the need for a snubberand voltage suppression circuitry. These controllersare also well suited for 48V telecom applications whereno galvanic isolation is required.
上传时间： 2013-10-31
上传用户：wwwe
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
摘要:双脉宽调制(PWM)控制的交—直—交电压型变频器适于用做交流励磁发电机的励磁电源,但交流励磁发电机运行状态的改变会引起双PWM交—直—交变频器直流链电压的波动,不利于整个发电系统的稳定运行。文中结合交流励磁发电机的运行特点,深入分析了直流链电压波动的原因,提出了基于转子侧变换器瞬时功率反馈控制的双PWM控制策略。实验结果验证了所提出的改进控制策略的正确性,该方法可有效维持发电机运行状态突变时直流链电压的稳定,大大增强了发电机系统的动态响应能力和稳定性。 关键词:交流励磁发电机;励磁电源;双PWM交—直—交变频器;直流链电压;瞬时功率反馈控制
上传时间： 2013-11-03
上传用户：wangjin2945
