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Thread: Making a PSU

  1. #21
    Variable Bitrate
    Join Date
    Jul 2000
    Location
    Ottawa, Canada
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    422

    Post

    What about something like this?

    The MAX771 uses a MOSFET to get 12v @ 1A from 2 to 16.5 V

    MAX771 PDF

    I found an equvalent MOSFET to what is used in their diagrams at OnSemi

    MMSF7N03HD PDF

    luckily enough they are both available as Samples

    So two or three would be needed to get some current but this would be better the stepping up and then down right?
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  2. #22
    FLAC
    Join Date
    Apr 2001
    Location
    Portland OR
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    Originally posted by Machs_FueL:
    <STRONG>What about something like this?

    The MAX771 uses a MOSFET to get 12v @ 1A from 2 to 16.5 V

    but this would be better the stepping up and then down right?</STRONG>
    Actually it is exactly the same as using the 2587 only it is a much smaller package. You could probably get 2 amps @ 15 volts in the 8-14 volt input range. You have to look at the application circuit, you will see that there is vin, then there is a coil, then there is a diode, then there is the output. you can think of the coil as just a wire, Your input has to be less than the output by .6 volts or so. It even says it in the data sheet, sorry for the bad news.. :-)

    Jeff_
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  3. #23
    Newbie
    Join Date
    Apr 2000
    Location
    Nijmegen, Netherlands
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    19

    Post

    I have used the MC34167T. This can do both step up and step down. So it will take anything from 8V to 16V. With an external BUZ11 it can deliver up to 3Amps!
    Check out my web page

  4. #24
    Variable Bitrate
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    isn't that be similar to a MAX771?
    [SIZE=1]'91 Nissan Stanza

    [XXXXXXXXXXXXXXXXXXXX] XX% Completed -
    Car Totaled and i bought a 20G mp3 player

    http://machs-fuel.tk
    a DIY video projector page

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