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How to provide different voltages to the user, through a single channel (switching)?.

Discussion in 'Electronic Design' started by Franco, May 3, 2007.

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  1. Franco

    Franco Guest

    Hi folks:

    I have a question.
    energize
    some little solenoids. In the board I have regulated 5, 12, and 24
    volts, and
    those are the voltages I want to deliver. I think I can deliver more
    or less
    300mA per channel (lets say: 5V-300mA, 12V-300mA, 24V-300mA). The last
    are conservative values.

    The important thing is: the output should be directed to the user
    by using a single medium. So the user will have available 5, 12, XOR
    24,
    but not all at the same time. Nonetheless, those voltages are still
    being used within the board, for some other tasks.

    So, I am wondering, which technology to use for achieving that???

    High side drivers and mosfets? (to switch between channels). (I dont
    like
    the space requirements)
    Another smarter solution?

    Drawing:

    5 -------
    |
    12 ------- --------- output
    |
    24 -------


    Best Regards...

    Franco.
     
  2. Guest



    try lm317 or send me email with more details on my private

    with subject lm317 not good for my application then I will connect you
    with the other solutions
     
  3. Franco

    Franco Guest


    Hi, unfortunately I have to use the voltages I have available and not
    to generate them again.
    The chip is also too big for my design. Space is an important
    constraint in this case.

    Cheers...

    Franco.
     
  4. John Fields

    John Fields Guest

     
  5. Rich Grise

    Rich Grise Guest

    Three reed relays with a little bit of logic for the "one and only one"
    function.

    Good Luck!
    Rich
     
  6. Franco

    Franco Guest

    Hi, the switching control will be done by a microcontroller on board.

    I am looking for P channel enhanced mode mosfet. Do I need
    a high side gate driver for driving them?

    Cheers...

    Franco.
     
  7. joseph2k

    joseph2k Guest

    Does it have to be able to change on the fly? (or do you have the luxury of
    using a miniature rotary or slide switch or jumper or move a terminal to a
    different position?)
     
  8. Franco

    Franco Guest

    Hi man, thanks for the tip. I think reed relays suit my needs. Thanks
    again.

    Franco.
     
  9. Franco

    Franco Guest

    Hi Joseph, it must be able to change on the fly, but speed is not
    important.

    I have a microcontroller with some pins available to make the
    switching.

    Cheers...

    Franco.
     
  10. joseph2k

    joseph2k Guest

    In that case i recommend two "TO-5" relays (actually in a TO-99 8 pin can,
    like an old op-amp). Two of them should have a smaller footprint than
    three reed relays. You probably will need transistors to drive the relays
    either way.
     
  11. YD

    YD Guest

    How do you distribute to the appropriate solenoid(s) on the receiving
    side, or how will you know which solenoid is connected?

    - YD.
     
  12. Franco

    Franco Guest

    In our system, the user is responsible for that connection.

    Greetings...

    Franco.
     
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