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LM2577: current limiter

Discussion in 'Electronic Design' started by Marco Trapanese, Sep 26, 2010.

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  1. Hi,

    I have a working board with a DC-DC step up with a LM2577-ADJ. Some more

    - input voltage: 12V
    - output voltage: 13V-19V
    - output current: up to 2A

    The output voltage is selected by a digital potentiometer inserter in
    the feedback voltage divider.

    I want to add a current limiter in order to lower the output voltage if
    the output current grow over 2A.

    What's the best way to achieve this?

    I can change the IC with another but I need a TO220 package and the same
    configuration. In other words, it should be nice a similar DC-DC with
    the Isense input pin.

    May you suggest something?

  2. Hammy

    Hammy Guest
  3. Hammy

    Hammy Guest

    Nope sorry just had a quick look.

    You can try Murata to see if they have a small module that can fit your
    exsisting footprint and specs like these.

    If it is just a few you can make your own like the one above useing one
    of the numerous boost controllers out there that has built in current

    Another simple hystertic controller
  4. Hammy

    Hammy Guest

    Good idea.
  5. Joerg

    Joerg Guest

    There's high-side current monitor chips that can do that almost directly
    (tie into the FB node as Neddie suggested). Some can have the sense
    resistor float dozens of volts above ground. I have done stuff like that
    many times, where 3-4 things tied into the FB node. Voltage, current,
    temperature, dance contest results, and whatnot.
  6. Il 28/09/2010 13:26, neddie ha scritto:

    Yes, I will do that if I don't find a suitable device. The problem is
    the space... I don't have much on the board.

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