ASC8511 是開關式、單節鋰電池充電管理芯片,采用峰值電流模控制的bUCk 拓撲結構，最大充電電流可達2.5A. ASC8511 通過恒壓控制環（CV）和恒流控制環（CC）來調整鋰電池充電電壓和恒流充電電流.ASC8511 集成電池過溫保護、充電時間限制、輸出短路等保護功能，通過NTC 檢測電池溫度，可以實現電池過熱保護功能，兩個LED 指示燈指示電池充電狀態.ASC8511 采用16 腳T-SSOP 封裝. 特點 ● 充電電壓精度0.5% ● 最大充電電流2.5A ● 自耗電小于5uA ● 電阻可編程調節恒流充電電流 ● 開關頻率500KHZ ● 適用于單節鋰電池充電 ● 軟啟動 ● 電池過溫保護 ● 芯片過熱保護 ● 狀態指示 ● 環境溫度范圍: -20℃～70℃ ● 16 腳T-SSOP 封裝 應用 ● 手持設備、POS機 ● MID、數碼產品 ● 移動DVD ● 筆記本、對講機
上傳時間： 2013-11-22
上傳用戶：13788529953
1.先計算bUCk 電容的損耗（電容的內阻為RbUCk 假設為350mΩ，輸入范圍為85VAC~264VAC,頻率為50Hz，POUT=60W,VOUT=60W）：
上傳時間： 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.
上傳時間： 2013-11-02
上傳用戶：名爵少年
A number of conventional solutions have been available forthe design of a DC/DC converter where the output voltageis within the input voltage range—a common scenarioin Li-Ion battery-powered applications—but none werevery attractive until now. Conventional topologies, suchas SEPIC or boost followed by bUCk, have numerousdisadvantages, including low effi ciency, complex magnetics,polarity inversion and/or circuit complexity/cost. TheLTC®3785 bUCk-boost controller yields a simple, effi cient,low parts-count, single-converter solution that is easyto implement, thus avoiding the drawbacks associatedwith traditional solutions.
上傳時間： 2013-10-21
上傳用戶：ljt101007
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.
上傳時間： 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.
上傳時間： 2013-11-04
上傳用戶：yxgi5
Linear Technology’s DC/DC step-down μModule®regulators are complete switchmode power supplies in asurface-mount package. They include the DC/DC controller,inductor, power switches and supporting circuitry.These highly integrated regulators also provide an easysolution for applications that require negative outputvoltages. In other words, these products can operate asinverting bUCk-boost regulators. As a result, the lowestpotential in the circuit is not the standard 0V, but –VOUT,which must be tied to the μModule regulator’s GND. Allsignals are now referred to –VOUT.
上傳時間： 2013-10-22
上傳用戶：ztj182002
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.
上傳時間： 2013-10-31
上傳用戶：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.
上傳時間： 2013-10-21
上傳用戶：非衣2016
