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Current Limiter

Discussion in 'Misc Electronics' started by Cos, Jul 10, 2005.

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  1. Cos

    Cos Guest

    Hi,

    For example I want to set the current limit of the input
    to say 10 Ampere. What kind of component can I put
    between it and the source. I can't use a fuse because
    it will blow up. I want the input to be at maximum
    10 Ampere even if the circuit is requiring 30 Ampere
    or more or a hundred.

    Thanks.

    Cos
     
  2. exxos

    exxos Guest


    Use a switchmode chip which drive a external mosfet, most of those devices
    have a current limit function, the classic is the 78S40 (I think).

    Chris
     
  3. Cos

    Cos Guest

    Can they accept 12 volts 10 ampere DC current limit function? How
    are they connected? Any diagram or pls describe in more details.
    Thanks.

    cos
     
  4. exxos

    exxos Guest

    The chip itself will go upto 40VDC, the current is only limited by the
    mosfet used. A simple google search for 78S40 pdf will give you all the info
    you need. Note that this is a old device now but really easy to hook up and
    I've ran this with a 12V 30amp constant load.

    Chris
     
  5. exxos

    exxos Guest


    outhouse express really killed that :-(

    Chris
     
  6. CWatters

    CWatters Guest

    I think he did. His drawing looks ok to me if I copy it into notepad and set
    a fixed pitch font. It's probably the font you are using.
     
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