Abstract: Rail splitting is creating an artificial virtual ground as a reference voltage. It is used to set the signalto match the op amp's "sweet spot." An op amp has the most linear- and distortion-free qualities at that sweetspot. Typically, the sweet spot occurs near the center between the single power rail and ground. In the case ofa number of signals, the virtual ground can control channel dc errors when multiplexing or switching thesignals.
標(biāo)簽： 電源調(diào)整 虛擬地
上傳時(shí)間： 2013-10-23
上傳用戶：wushengwu
在航天等空間產(chǎn)品中使用的分布式供電系統(tǒng)中，總體電路一般只提供27~30 V的直流一次電源，各單機(jī)產(chǎn)品大多采用dc/dc模塊將該一次電源轉(zhuǎn)換為所需的二次電源，并實(shí)現(xiàn)一次地與二次地的隔離。分析了INTERPOINT公司的dc/dc模塊的輸入端反接后，輸入電壓對(duì)dc/dc模塊、電源保護(hù)濾波電路及負(fù)載的影響，通過(guò)仿真與驗(yàn)證試驗(yàn)，得出電源模塊輸入端反接后單機(jī)產(chǎn)品中電源保護(hù)電路發(fā)生作用，對(duì)產(chǎn)品中負(fù)載無(wú)影響，可以繼續(xù)使用。電源模塊失效分析對(duì)航天產(chǎn)品中電源模塊中出現(xiàn)類似的故障后的處理提供了參考。
上傳時(shí)間： 2013-11-05
上傳用戶：kangqiaoyibie
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
高的工作電壓高達(dá)100V N雙N溝道MOSFET同步驅(qū)動(dòng) The D810dcdc is a synchronous step-down switching regulator controller that can directly step-down voltages from up to 100V, making it ideal for telecom and automotive applications. The D810dcdc uses a constant on-time valley current control architecture to deliver very low duty cycles with accurate cycle-by-cycle current limit, without requiring a sense resistor. A precise internal reference provides 0.5% dc accuracy. A high bandwidth (25MHz) error amplifi er provides very fast line and load transient response. Large 1Ω gate drivers allow the D810dcdc to drive multiple MOSFETs for higher current applications. The operating frequency is selected by an external resistor and is compensated for variations in VIN and can also be synchronized to an external clock for switching-noise sensitive applications. Integrated bias control generates gate drive power from the input supply during start-up and when an output shortcircuit occurs, with the addition of a small external SOT23 MOSFET. When in regulation, power is derived from the output for higher effi ciency.
上傳時(shí)間： 2013-10-24
上傳用戶：wd450412225
本應(yīng)用報(bào)告描述了一個(gè)具有寬電壓輸入的智能電池充電器。其中的參考設(shè)計(jì)實(shí)現(xiàn)了在MSP430微控制器和兼容SMBus的電池電量計(jì)之間進(jìn)行通信的系統(tǒng)管理總線（SMBus）協(xié)議。MSP430 器件通過(guò)SMBus 從電量計(jì)獲取電壓、電流和其它一些參數(shù)，之后通過(guò)調(diào)節(jié)輸出到dc/dc變換器模塊的PWM 占空比來(lái)傳遞電池所需的電量。
標(biāo)簽： SMBus MSP 430 bq電量計(jì)
上傳時(shí)間： 2013-10-28
上傳用戶：1427796291
Multiple-voltage electronics systems often requirecomplex supply voltage tracking or sequencing, whichif not met, can result in system faults or even permanentfailures in the fi eld. The design diffi culties in meetingthese requirements are often compounded in distributedpowerarchitectures where point-of-load (POL) dc/dcconverters or linear regulators are scattered across PCboard space, sometimes on different board planes. Theproblem is that power supply circuitry is often the lastcircuitry to be designed into the board, and it must beshoehorned into whatever little board real estate is left.Often, a simple, drop-in, fl exible solution is needed tomeet these requirements.
標(biāo)簽： 負(fù)載點(diǎn)電路 電源電壓 排序
上傳時(shí)間： 2013-10-08
上傳用戶：15071087253
完全替代原裝國(guó)半dc-dc產(chǎn)品LM2596系列產(chǎn)品，性價(jià)比優(yōu)勢(shì)！
上傳時(shí)間： 2013-10-24
上傳用戶：moshushi0009
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
Easy-to-use and compact point-of-load power suppliesare necessary in systems with widely distributed, highcurrent, low voltage loads. The LTC®3415 provides acompact, simple and versatile solution. It includes a pairof integrated complementary power MOSFETs (32mΩtop and 25mΩ bottom) and requires no external senseresistor. A complete design requires an inductor andinput/output capacitors, and that’s it. The result is a fast,constant frequency, 7A current mode dc/dc switchingregulator.
標(biāo)簽： 387 DN 級(jí)聯(lián) 負(fù)載
上傳時(shí)間： 2013-10-18
上傳用戶：avensy
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.
標(biāo)簽： 378 DN 低靜態(tài)電流 單片式
上傳時(shí)間： 2013-10-15
上傳用戶：stampede
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