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N-channel or P-channel Mosfets

Discussion in 'Beginner Electronics' started by HappyHobit, May 17, 2006.

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  1. HappyHobit

    HappyHobit Guest

    Hi All,

    I'm building a motor controller for an electric bike. The circuit I found
    uses a microcontroller, a 4N35 Opto-isolator and N-channel Mosfets. I like
    micros and want to do voltage and current monitoring.

    The problem is microcontroller has to turn the 4N35 ON to turn the
    Mosfets OFF. I don't like that. If the 4N35 or the 5 volt supply fails
    the
    Mosfets turn on FULL.

    I was thinking of using P-channel Mosfets. (And of course appropriate
    circuit and logic changes)

    Is there any prevailing reason to use N-channel rather than P-channel
    Mosfets?

    Thanks for any enlightenment you can provide.


    Jay
     
  2. HappyHobit

    HappyHobit Guest

    Yes, I get it, but Why?

    Thank you. Than answers my question.

    Jay
     
  3. Hlrsr

    Hlrsr Guest

    Though the mobility (ì) of holes is less than the mobility of electrons thus
    n-channel are "faster"
     
  4. Tater Schuld

    Tater Schuld Guest

    better read you theory books again, all of you

    holes don't exist, they are just used to properly explain the missing
    electrons.

    for the application involved, it does not matter if your use hole flow or
    electron flow
     
  5. Hlrsr

    Hlrsr Guest

    We know that a hole is the absense of an electron, though it has an
    _effective mass_

    Look
    http://en.wikipedia.org/wiki/Effective_mass


     
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