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Datasheet Linear Technology LT3748IMS#PBF

ПроизводительLinear Technology
СерияLT3748
МодельLT3748IMS#PBF

100V Isolated Flyback Controller

Datasheets

  • Скачать » Datasheet, PDF, 542 Кб, Версия: B, Файл закачен 31-07-2016
    LT3748 - 100V Isolated Flyback Controller
    Выписка из документа ↓
    LT3748
    100V Isolated
    Flyback Controller
    Features Description 5V to 100V Input Voltage Range
    nn 1.9A Average Gate Drive Source and Sink Current
    nn Boundary Mode Operation
    nn No Transformer Third Winding or Opto-Isolator
    Required for Regulation
    nn Primary-Side Winding Feedback Load Regulation
    nn V
    OUT Set with Two External Resistors
    nn INTV
    CC Pin for Control of Gate Driver Voltage
    nn Programmable Soft Start
    nn Programmable Undervoltage Lockout
    nn Available in MSOP Package The LTВ®3748 is a switching regulator controller specifically
    designed for the isolated flyback topology and capable of
    high power. It drives a low side external N-channel power
    MOSFET from an internally regulated 7V supply. No third
    winding or opto-isolator is required for regulation as the
    part senses the isolated output voltage directly from the
    primary-side flyback waveform. nn The LT3748 utilizes boundary mode to provide a small
    magnetic solution without compromising load regulation. ...

Цены

    MSOP
    Цена LT3748IMS#PBF
    ПоставщикПроизводительНаименованиеЦена
    AliExpressLT3748EMS LT3748IMS LT3748HMS LT3748 1 шт.192 руб.
    ЭлитанLinear TechnologyLT3748IMS404 руб.
    КремнийLinear TechnologyLT3748IMS PBFпо запросу
    Подробнее об условиях поставки »

Корпус / Упаковка / Маркировка

КорпусMS-16
Код корпусаMS
Индекс корпуса05-08-1847

Параметры

Demo BoardsDC1557A,DC1860B,DC1961A,DC1694B
Design ToolsLTspice File
Экспортный контрольнет
Основные особенностиBoundary Mode Operation, No Opto Isolator
Integrated Inductorнет
Isupply1.3 мА
Monolithicнет
Количество выходов1
Рабочий диапазон температурот -40 до 85 °C
Polyphaseнет
Switch Current25 A
Synchronousнет
TopologyFlyback
Vin Max100 В
Vin Min5 В

Экологический статус

RoHSСовместим

Статьи

  • Скачать » Статьи - LT Journal, PDF, 376 Кб, 06-01-2014
    Increase Current Capability and Simplify Thermal Design of Flyback Converters with Secondary-Side Synchronous Rectifier Driver in a 5-Pin SOT-23
    Выписка из документа ↓
    Increase Current Capability and Simplify Thermal Design
    of Flyback Converters with Secondary-Side Synchronous
    Rectifier Driver in a 5-Pin SOT-23
    Wei Gu In a flyback converter, current levels in high current applications are constrained
    by heat produced in the output rectifier diode. The clear way to lift this restriction
    is to replace the diode with a much lower voltage drop MOSFET, significantly
    reducing heat produced in the rectifier—reduced heat dissipation increases output
    current capability and efficiency, and simplifies thermal design. The LT8309 is a
    secondary-side synchronous MOSFET driver that replicates the behavior of the
    output diode by sensing the drain-to-source voltage of the MOSFET to determine
    if should be on or off, allowing it to replace a less efficient rectifier diode.
    The LT8309 can be combined with any
    of Linear’s line of no-opto boundarymode flyback ICs (such as the LT3748
    primary side controller) to produce high
    performance isolated power supplies
    with a minimal number of components.
    5V, 8A ISOLATED SUPPLY Figure 1 shows a low voltage, high
    current, low parts count flyback
    supply. The traditional output diode is
    replaced by an ideal diode consisting
    of the LT8309, a MOSFET and a few
    small external components.
    For a MOSFET to act as a diode it must ...
  • Скачать » Статьи - LT Journal, PDF, 1.0 Мб, 18-01-2011
    Isolated Power Supplies Made Easy
    Выписка из документа ↓
    Isolated Power Supplies Made Easy
    John D. Morris The LT3748 is a switching regulator controller specifically
    designed to simplify the design of isolated power supplies
    using a flyback topology. No third winding or opto-isolator
    is required as the LT3748 senses the isolated output
    voltage directly from the primary-side flyback waveform.
    One challenge in designing a flyback
    converter is that information relating to
    the output voltage on the secondary side
    of the transformer must be fed back to the
    regulator on the primary side in order to
    maintain regulation. Historically, feedback
    across the isolation barrier is achieved
    using opto-isolators or extra transformer
    windings, though both methods present a
    number of design problems. Opto-isolator
    feedback circuits add components, increasing converter size and cost. They also draw
    power, degrading efficiency and complicating thermal design. Opto-isolators also
    make it difficult to accurately regulate
    the output due to their limited dynamic
    response, inherent nonlinearities, typical
    variation from unit-to-unit and variation with age. The usual alternative is
    to add an extra transformer winding, ...

Модельный ряд

Серия: LT3748 (8)

Классификация производителя

  • Power Management > Switching Regulator > Flyback, Forward and Isolated Controllers
  • Space & Harsh Environment > Extended Temperature Plastic (H & MP) > Extended Temperature (H & MP) Switching Regulators

Варианты написания:

LT3748IMSPBF, LT3748IMS PBF

На английском языке: Datasheet Linear Technology LT3748IMS#PBF

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