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output job

  • 電源供應(yīng)器與數(shù)字電位器校準(zhǔn)應(yīng)用筆記

    Abstract: A resistive feedback network is often used to set the output voltage of a power supply. A mechanical potentiometer (pot)conveniently solves the problem of adjusting a power supply. For easier automatic calibration, a mechanical pot can be replaced witha digital pot. This application note presents a calibration solution that uses a digital pot, because digipots are smaller, do not movewith age or vibration, and can be recalibrated remotely. This proposed solution reduces the susceptibility of the system to thetolerance of the digital pot's end-to-end resistance, making the solution optimal fordesigners. This application note also explainssome of the equations required to calculate the resistor chain values and to use a digital pot in this way. A spreadsheet withstandard reisistor values is available for easy calculations.

    標(biāo)簽: 電源供應(yīng)器 數(shù)字電位器 應(yīng)用筆記 校準(zhǔn)

    上傳時間: 2013-10-31

    上傳用戶:caiguoqing

  • 使用H橋變壓器驅(qū)動器,充電超級電容器

    Abstract: With its small size and large load (10W) capability, the MAX13256 H-bridge transformer driver is an attractive solution forcharging supercapacitors (supercaps). However, a large capacitance on the output of the circuit can force the driver into fault modeat startup, due to the high initial charge current. This application note presents a solution that allows users to charge a largecapacitance without going into fault.

    標(biāo)簽: H橋變壓器 驅(qū)動器 充電 超級電容器

    上傳時間: 2013-10-20

    上傳用戶:2728460838

  • 電感開關(guān)穩(wěn)壓器提高輸入電壓

    Abstract: Uses the MAX641 switching controller and an external discrete charge pump to step up the input voltage. This circuitcan service low loads and is efficient when the output is two, three, four times the input voltage. Adding the MAX627 MOSdriver can further increase the output current capability.

    標(biāo)簽: 電感 開關(guān)穩(wěn)壓器 輸入電壓

    上傳時間: 2013-11-15

    上傳用戶:zwei41

  • 四路輸出開關(guān)轉(zhuǎn)換器提供TFT LCD面板的電源

      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.

    標(biāo)簽: TFT LCD 四路輸出 開關(guān)轉(zhuǎn)換器

    上傳時間: 2013-10-19

    上傳用戶:yuhaihua_tony

  • 簡單、高效USB電源管理IC解決方案

      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.

    標(biāo)簽: USB 電源管理IC 方案

    上傳時間: 2013-11-02

    上傳用戶:名爵少年

  • 單片同步穩(wěn)壓器驅(qū)動外部元件負(fù)載

      The LTC®3414 offers a compact and efficient voltage regulatorsolution for point of load conversion in electronicsystems that require low output voltages (down to 0.8V)from a 2.5V to 5V power bus. Internal power MOSFETswitches, with only 67mW on-resistance, allow theLTC3414 to deliver up to 4A of output current with efficiencyas high as 94%. The LTC3414 saves space by operatingwith switching frequencies as high as 4MHz, enabling theuse of tiny inductors and capacitors.

    標(biāo)簽: 同步穩(wěn)壓器 元件 驅(qū)動 負(fù)載

    上傳時間: 2014-01-03

    上傳用戶:dongbaobao

  • 100-15V TO 12V DCDC 原理圖 PCB BOM表

    高的工作電壓高達(dá)100V N雙N溝道MOSFET同步驅(qū)動 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.

    標(biāo)簽: DCDC 100 12V BOM

    上傳時間: 2013-10-24

    上傳用戶:wd450412225

  • DN387 級聯(lián)7A點(diǎn)的負(fù)載單片降壓轉(zhuǎn)換器

      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 級聯(lián) 負(fù)載

    上傳時間: 2013-10-18

    上傳用戶:avensy

  • DN383 高電壓電流模式降壓轉(zhuǎn)換器

      Low power standby requirements are typically associatedwith battery-powered systems. Automotive systems,for example, commonly require power supplies tomaintain output voltage regulation even under no-loadconditions—while drawing minimal quiescent current topreserve battery life. Rising energy costs, however, haveextended the need for low current standby operation toline-powered systems, such as small plugged-in appliancesfor home and business.

    標(biāo)簽: 383 DN 高電壓 電流模式

    上傳時間: 2013-11-20

    上傳用戶:xinyuzhiqiwuwu

  • DN378 低靜態(tài)電流單片式降壓型穩(wěn)壓器

      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

    上傳時間: 2013-10-15

    上傳用戶:stampede

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