• Gate and drain waveforms of LT8309 in 5V/3A app

    Hello everybody,

    we have implemented a design based on the LT3748 and LT8309 to supply 3A at 5V from ~48V input voltage (PoE application). The design works in principle, the measured output voltage is close to 5V with various loads.

    A question occured…

  • RE: Isolation for a chain of swithcing regulator

    Hi Power Jack,

    If you mean galvanically isolated, you can refer to No-opto Flyback Family like LT8309, LT3748.
    https://www.analog.com/en/parametricsearch/11493#/sort=5384,asc

    For higher power a forward converter like LT3753 or ADP1074 can help.

    If you…

  • RE: LT3748 12-36 V Input, 12V/3A Output Design

    Inspired by W.G schematic I study datasheets again and make calculation.
    I get the same result as WG... and decide to make some improvements :)
    I use synchronous rectifying with LT8309.

      

    LTSpice files attached.

    LT3748_8309_12V5A_REV03.zip

    With Best Wish…

  • RE: Output Voltage Ripple in LT3748 Simulation

    Hi,
    I compress to ZIP files before upload. That`s work.
    BTW, your schematic differ from fig. 21 datasheet.

    Also LTSpice files available for design above.
    See LT3748 product page

      

    I can recommend using LT8309 for high output current.
    Look at fig23-24 from…

  • Using LT3798 sample circuit for 5 V 3 A output

    I am interested in using the given example circuit (linked below) for my senior design project and was wondering what transformer (part # off the shelf) I could use to provide 5 V 3 A output? (Preferably from Wurth Electronic) Additionally, I am interesting…
  • RE: LT3748 VS LT4295 for PoE

    Hello,

    We do offer several PoE PD solutions that can be configured as a non-opto synchronous flyback converter. LTC4269-1 uses a third winding for feedback and biasing, while LT4276 and LT4295 use the third winding for feedback only. LT3748 is a non-synchronous…

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