随着科技的发展及工业现代化，环境污染是当前国际性问题。蓄电池是人类研制出的性能优异的储能设备，还有IT产品的大量应用。市场上对蓄电的需求量越来越大。而每个厂家的产品质量不同，需要对电池的循环寿命进行检测。本课题设计了基于TMS320F2812 的DSP芯片为控制中心，由高性能的A/D转换器TLC2543和D/A转换器MAX538等构成的蓄电池循环寿命检测系统。同时易于计算机相连，形成一个自动的检测网络。而且按相关的标准进行放电，研究发现取得了很好的效果。
上传时间： 2014-12-24
上传用户：tianming222
Abstract: The DS1875 features a pulse-width modulation (PWM) controller that can be used to control aDC-DC converter. The DC-DC converter can then be used to generate the high bias voltages necessaryfor avalanche photodiodes (APDs). This application note describes the operation of a boost converterthat uses the DS1875. Discussion covers the selection of the inductor and switching frequency, and theselection of components that improve the efficiency of the converter. Test data are presented.
上传时间： 2013-10-26
上传用户：lyson
LM2596开关电压调节器是降压型电源管理单片集成电路，能够输出3A的驱动电流，同时具有很好的线性和负载调节特性。固定输出版本有3.3V、5V、12V， 可调版本可以输出小于37V的各种电压。 该器件内部集成频率补偿和固定频率发生器，开关频率为150KHz，与低频开关调节器相比较，可以使用更小规格的滤波元件。由于该器件只需4个外接元件，可以使用通用的标准电感，这更优化了LM2596的使用，极大地简化了开关电源电路的设计。 其封装形式包括标准的5脚TO-220封装（DIP）和5脚TO-263表贴封装（SMD）。 该器件还有其他一些特点：在特定的输入电压和输出负载的条件下，输出电压的误差可以保证在±4%的范围内，振荡频率误差在±15%的范围内；可以用仅80μA的待机电流， 实现外部断电；具有自我保护电路（一个两级降频限流保护和一个在异常情况下断电的过温完全保护电路） ※ 3.3V、5V、12V的固定电压输出和可调电压输出 ※ 可调输出电压范围1.2V～37V±4% ※ 输出线性好且负载可调节 ※ 输出电流可高达3A ※ 输入电压可高达40V ※ 采用150KHz的内部振荡频率，属于第二代开关电压调节器，功耗小、效率高 ※ 低功耗待机模式，IQ的典型值为80μA ※ TTL断电能力 ※ 具有过热保护和限流保护功能 ※ 封装形式：TO-220（T）和TO-263（S） ※ 外围电路简单，仅需4个外接元件， 且使用容易购买的标准电感
上传时间： 2014-12-24
上传用户：ttpay
描述了一种简易的交流数字电压表的系统设计。系统以MSP430F448为核心，该单片机内部集成了12位的A/D转换器，转换器带有内部参考源、采样保持、自动扫描特性，极大地简化了硬件设计。
上传时间： 2014-12-22
上传用户：cuibaigao
The LT®1943 is a highly integrated, 4-output regulatordesigned to power large TFT LCD panels. The LT1943employs switching regulators—instead of linear regulators—to minimize power dissipation and accommodate awide input voltage range. The wide input range, 4.5V to22V, allows it to accept a variety of power sources,including the commonly used 5V, 12V and 19V AC adaptors.
上传时间： 2013-10-19
上传用户：yuhaihua_tony
Automobile electronic systems place high demands ontoday’s DC/DC converters. They must be able to preciselyregulate an output voltage in the face of wide temperatureand input voltage ranges—including load dump transientsin excess of 60V and cold crank voltage drops to 4V. Theconverter must also be able to minimize battery drain inalways-on systems by maintaining high effi ciency over abroad load current range. Similar demands are made bymany 48V nonisolated telecom applications, 40V FireWireperipherals and battery-powered applications with autoplug adaptors. The LT3437’s best in classperformancemeets all of these requirements in a small thermallyenhanced 3mm × 3mm DFN package.
上传时间： 2013-10-15
上传用户：stampede
Battery powered applications that have a signifi cantamount of time in standby mode, require electrical circuitsto operate with a low quiescent current to preserve batterylife. The LTC3835 synchronous step-down controlleris an excellent solution with its ultralow quiescent current(80μA). Other features make it uniquely qualifi ed tosatisfy the needs of automotive applications. A wide 4Vto 36V input voltage range protects the supply againsthigh input voltage transients and is compatible with lowvoltage cold crank conditions. The constant frequencycurrent-mode architecture with high-side inductor current
上传时间： 2013-11-20
上传用户：stewart·
Automotive batteries, industrial power supplies, distributedsupplies and wall transformers are all sources ofwide-ranging high voltage inputs. The easiest way to stepdown these sources is with a high voltage monolithicstep-down regulator that can directly accept a wide inputrange and produce a well-regulated output. The LT®3493accepts inputs from 3.6V to 36V and LT3481 acceptsinputs from 3.6V to 34V. Both provide excellent lineand load regulation and dynamic response. The LT3481offers a high effi ciency solution over a wide load range andkeeps the output ripple low during Burst Mode® operationwhile the LT3493 provides a tiny solution with minimalexternal components. The LT3493 operates at 750kHzand the LT3481 has adjustable frequency from 300kHzto 2.8MHz. High frequency operation enables the use ofsmall, low cost inductors and ceramic capacitors.
上传时间： 2014-12-24
上传用户：Pzj
Many telecommunications and computing applicationsneed high effi ciency step-down DC/DC converters thatcan operate from a very low input voltage. The highoutput power synchronous controller LT3740 is idealfor these applications, converting input supplies rangingfrom 2.2V to 22V to outputs as low as 0.8V with loadcurrents from 2A to 20A. Applications include distributedpower systems, point-of-load regulation and conversionof logic supplies.
上传时间： 2013-11-05
上传用户：zhf01y
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
