ASC8511 是開關(guān)式、單節(jié)鋰電池充電管理芯片,采用峰值電流模控制的BUCK 拓?fù)浣Y(jié)構(gòu)，最大充電電流可達(dá)2.5A. ASC8511 通過恒壓控制環(huán)（CV）和恒流控制環(huán)（CC）來調(diào)整鋰電池充電電壓和恒流充電電流.ASC8511 集成電池過溫保護(hù)、充電時(shí)間限制、輸出短路等保護(hù)功能，通過NTC 檢測(cè)電池溫度，可以實(shí)現(xiàn)電池過熱保護(hù)功能，兩個(gè)LED 指示燈指示電池充電狀態(tài).ASC8511 采用16 腳T-SSOP 封裝. 特點(diǎn) ● 充電電壓精度0.5% ● 最大充電電流2.5A ● 自耗電小于5uA ● 電阻可編程調(diào)節(jié)恒流充電電流 ● 開關(guān)頻率500KHZ ● 適用于單節(jié)鋰電池充電 ● 軟啟動(dòng) ● 電池過溫保護(hù) ● 芯片過熱保護(hù) ● 狀態(tài)指示 ● 環(huán)境溫度范圍: -20℃～70℃ ● 16 腳T-SSOP 封裝 應(yīng)用 ● 手持設(shè)備、POS機(jī) ● MID、數(shù)碼產(chǎn)品 ● 移動(dòng)DVD ● 筆記本、對(duì)講機(jī)
上傳時(shí)間： 2013-11-22
上傳用戶：13788529953
UPS簡(jiǎn)介，IGBT在UPS中的應(yīng)用 DC/AC逆變器，BOOST升壓電路，AC/DC整流，充電電路 防止IGBT損壞措施
標(biāo)簽： IGBT UPS 中的應(yīng)用
上傳時(shí)間： 2013-12-03
上傳用戶：ly1994
隨著功率開關(guān)器件的發(fā)展，電力電子裝置日益小型化和高頻化，電氣性能大幅提高，但是隨之產(chǎn)生的高次諧波卻對(duì)電網(wǎng)造成嚴(yán)重污染。在電力電子設(shè)備中，整流器(AC／DC變流器)占有較大的比例，是主要的污染源。由于固態(tài)感應(yīng)加熱電源對(duì)于電網(wǎng)呈現(xiàn)非線性特性，從電網(wǎng)中輸出的電流就不是標(biāo)準(zhǔn)的正弦曲線。高頻諧波電流對(duì)電力設(shè)施產(chǎn)生過熱或其他危害。 Boost電路應(yīng)用到功率因數(shù)校正方面已經(jīng)較為成熟，對(duì)于幾百瓦小功率的功率因數(shù)校正，常規(guī)的電路是可以實(shí)現(xiàn)的。但是對(duì)于大功率諸如感應(yīng)加熱電源，還存在很多的實(shí)際問題。為了解決開關(guān)器件由于二極管反向恢復(fù)時(shí)產(chǎn)生的沖擊電流而易損壞的情況，減少開關(guān)器件在高頻下的開關(guān)損耗，本文采用一種無源無損緩沖電路取代傳統(tǒng)的LC濾波電路。在分析了軟開關(guān)電路的工作原理以及逆變模塊的分時(shí)-移相功率控制策略后，應(yīng)用Matlab軟件進(jìn)行了仿真，并通過實(shí)驗(yàn)結(jié)果驗(yàn)證了理論分析的正確性。
標(biāo)簽： APFC 軟開關(guān) 倍頻 感應(yīng)加熱電源
上傳時(shí)間： 2014-12-24
上傳用戶：RQB123
1.先計(jì)算BUCK 電容的損耗（電容的內(nèi)阻為Rbuck 假設(shè)為350mΩ，輸入范圍為85VAC~264VAC,頻率為50Hz，POUT=60W,VOUT=60W）：
標(biāo)簽： 開關(guān)電源設(shè)計(jì) 計(jì)算
上傳時(shí)間： 2013-12-24
上傳用戶：yd19890720
Linear Technology offers a variety of devices that simplifyconverting power from a USB cable, but the LTC®3455represents the highest level of functional integration yet. The LTC3455 seamlessly manages power flowbetween an AC adapter, USB cable and Li-ion battery,while complying with USB power standards, all from a4mm × 4mm QFN package. In addtion, two high efficiencysynchronous buck converters generate low voltage railswhich most USB-powered peripherals require. TheLTC3455 also provides power-on reset signals for themicroprocessor, a Hot SwapTM output for poweringmemory cards as well as an uncommitted gain blocksuitable for use as a low-battery comparator or an LDOcontroller. The PCB real estate required for the entire USBpower control circuit and two DC/DC converters is only225mm2.
上傳時(shí)間： 2013-11-02
上傳用戶：名爵少年
DC/DC 升壓IC：The FP6291 is a current mode boost DC-DC converter. Its PWM circuitry with built-in 0.25 Ω power MOSFET make this regulator highly power efficient. The internal compensation network also minimizes as much as 6 external component counts. The non-inverting input of error amplifier connects to a 0.6V precision reference voltage and internal soft-start function can reduce the inrush current. The FP6291 is available in the SOT23-6L package and provides space-saving PCB for the application fields.
上傳時(shí)間： 2013-11-07
上傳用戶：3294322651
Video cable driver amplifi er output stages traditionallyrequire a supply voltage of at least 6V in order to providethe required output swing. This requirement is usuallymet with 5V supplies by adding a boost regulator or asmall local negative rail, say via the popular LT®1983-3.Such additional circuitry is unnecessary in typical 1VP-Pvideo connections, such as HD component video, if thecable driver amplifi ers simply offer near rail-to-rail outputcapability when powered from 5V.
上傳時(shí)間： 2013-11-16
上傳用戶：yanyangtian
The LTC®3562 quad output step-down regulator is designedfor multicore handheld microprocessor applications thatoperate from a single Li-Ion battery. Its four monolithic, higheffi ciency buck regulators support Intel’s mobile CPU P-Stateand C-State energy saving operating modes. The outputvoltages are independently controllable via I2C, and eachoutput can be independently started and shut down. Designerscan choose from power saving pulse-skipping mode orBurst Mode® operation, or select low noise LDO mode. Thespace-saving LTC3562 is available in a 3mm × 3mm QFNpackage and requires few external components.
上傳時(shí)間： 2013-10-07
上傳用戶：1583060504
The LTC®3569 is a compact power solution for handhelddevices. Its tiny 3mm × 3mm QFN package includesthree buck regulators with individually programmableoutput voltages. One regulator supports load currentsup to 1200mA, while the other two support currents to600mA. Two regulators can be paralleled for increasedload capability. Each current-mode regulator is internallycompensated with excellent load and line regulation. Acomplete 2- or 3-output solution requires a minimumof external passive components.
標(biāo)簽： Wire 降壓穩(wěn)壓器 動(dòng)態(tài) 可編程
上傳時(shí)間： 2013-10-11
上傳用戶：yxgi5
The LTC3546 is a dual output current mode buck regulatorwith fl exible output current partitioning. Beyondthe advantages normally associated with dual outputregulators (reduced size, cost, EMI and part count, withimproved effi ciency), the LTC3546’s outputs can bepartitioned for either 3A and 1A outputs, or two 2A outputs.This increases its application range and simplifi esmultiple supply rail designs. A confi gurable Burst Mode®clamp for each output sets the current transition levelbetween Burst Mode operation and forced continuousconduction mode to optimize effi ciency over the entireoutput range. An adjustable switching frequency up to4MHz and internal power MOSFET switches allow forsmall and compact footprints.
上傳時(shí)間： 2013-11-04
上傳用戶：yxgi5
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