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wide range voltage input

Discussion in 'Electronic Basics' started by ltj, May 19, 2004.

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  1. ltj

    ltj Guest

    If you had a small 3.3V, 50mA circuit how could you make it to accept a
    5-24VDC input range? Cost is an issue.
     
  2. Are you talking about responding to logic signals or measuring analog
    signals?
     
  3. ltj

    ltj Guest

    oops...for powering the circuit. A regulator will get too hot if I drop too
    much voltage across it, so what is a good way to have a wide power input
    range?
     
  4. A switching regulator converts one voltage to another with minimal
    power loss. Here is a tutorial on the subject to get you started.
    http://www.national.com/appinfo/power/files/f5.pdf

    This page on the National Semiconductor site will design a switching
    regulator for you, to your specifications:
    http://www.national.com/appinfo/power/

    That said, 50 ma drawn from a 24 volt source represents only 1.2
    watts, total. So a linear regulator would have to waste no more than
    (24-3.3)*.05=1.03 watts. That is about what a square inch of heat
    sink could dump.
     
  5. ltj

    ltj Guest


    Wow, so helpful.!

    A switching regulator is what I'm looking for.

    This is a MUST READ for rookies!
    http://www.national.com/appinfo/power/files/f5.pdf.

    Don't know what I'd do without S.E.(...),
    Thank you very much
     
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