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[email protected] switching power supply

Discussion in 'Electronic Design' started by Hassan, Oct 18, 2004.

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  1. Hassan

    Hassan Guest

    Hello;
    I want to design a switching power supply with:
    Vin=24 Vdc and Vo=15V @ 7A
    I am looking for a switcher IC something like LM2678 with integrated
    controller and Power Mosfet. But LM2678 has a maximum current
    limitation of 5A.
    Does any body know an IC which I can use for this project? I mean
    something with a controller and power Mosfet just in a package.

    Thank you in advance
    Hassan
     
  2. John Larkin

    John Larkin Guest

    Check out the LTC polyphase switchers. Some of them put out a lot of
    current.

    John
     
  3. Brian

    Brian Guest

    I use an IC that has the controller and a 1.5 amp drive transistor in it.
    To get the extra amps, I add a power Mosfet to it. I drew a circuit using
    the IC and a power Mosfet, to do what you want. You can see it at
    http://www.fncwired.com/StepDnEx/
    If you have any questions, please ask.
    Brian
     
  4. Anders F

    Anders F Guest

    I'd say: Don't let the mosfets scare you... Then you have plenty of good
    choices!

    Cheers,
    Anders
     
  5. Hassan

    Hassan Guest

    Hello;
    Thank you very much for your help.
    It seems that you have used a program for calculating the components
    values. Would you please tell me where I can find that program?
    Also I need another Power Supply which can convert the Vin= 12V to Vo=
    [email protected] I want to use the MC34063 that you have used. Would you please
    show me a step-up converter for the above specifications with the
    MC34063? The best thing for me would be to use the same PCB for both
    the step-up and step-down converters with MC34063.
    I am looking forward to hearing from you.
    Thanks
    Hassan
     
  6. Hassan

    Hassan Guest

    Hello;
    The real application is:
    30 < Vin < 9 and Vo= 15 V @ 7A
    As you see, it is both a step up and step down converter.
    Would you please show me how to design it with MC34063A?
    Thank you in advance.
    Hassan
     
  7. Brian

    Brian Guest

    I have added two additional schematics at the site I sent you to before
    http://www.fncwired.com/StepDnEx/
    It has a step-up and a step-up/step-down schematic added. The program I am
    using is "FNC-Elcad". You can see more about it, where the schematics are
    (just click on "Home" or "Program Guide" while you are there). Hope this
    helps. If you have anymore questions, please feel free to ask.
    Brian
     
  8. Mike Page

    Mike Page Guest

    I suggest you start with a 24V -> 12V switcher (available at 10A for
    vehicular use) and "adjust" it.

    Best regards,
    Mike.
     
  9. Brian

    Brian Guest

    Hi Mike,
    Is that 10A peak or 10A continous? If that's 10A continous, do you have a
    part number?
    Best regards,
    Brian
     
  10. Clarence

    Clarence Guest

  11. Brian

    Brian Guest

  12. Brian

    Brian Guest

    Maybe I misunderstood you, are you talking about an IC or a complete power
    supply.
    Thanks,
    Brian
     
  13. John Fields

    John Fields Guest

  14. Clarence

    Clarence Guest

    Oh, simple -- LM5642 National Semi.
    Or LTC1775 See schmatic in SED
     
  15. Clarence

    Clarence Guest

    I have your design..... He wasn't specific about the level he wanted in the
    original posting. I see someone else ask as well.

    Or are you only showing that you didn't understand?
     
  16. Clarence

    Clarence Guest

    Did you get my schematic?
    Is it along the lines of what you wanted?
     
  17. John Fields

    John Fields Guest

    ---
    You "have" my design? Care to elaborate?

    You don't have shit, you phony little pissant, and trying to weasel
    out of it by saying that he wasn't specific about the level he wanted
    is typical of crap like you.

    At _any_ level, cutting and pasting a URL has about as much semblance
    to design as paint-by-numbers has to Michelangelo, but you wouldn't
    know anything about that would you?

    Maybe cutting and pasting a URL seems like design to an idjit like
    you, but if you had the wherewithal to think about it, you might come
    to the conclusion that the guy who figured out the power supply was
    the designer, and what the OP asked for was help in achieving a goal
    like that, for whatever reason.
     
  18. Clarence

    Clarence Guest

    As usual, ran off at the mouth, spreading foul and nasty things which he is so
    familiar with.

    He is about to burst a blood vessel and can not seem to control himself.

    Besides he has a mean streak a mile wide.

    Spicewood club? Funny name.

    Are all the people there like you?
    No don't answer, you need to relax and get some sleep.

    See your doctor soon, he will give you something to calm your nerves and let
    you sleep.

    Wow. I never though walking the dog could be so exhausting!
     
  19. Clarence

    Clarence Guest

    Okay, weak mind, poor to no control, the usual ilk of someone with megalomania.
    The foul mouth is properly labeled!

    I didn't say I 'did' the design, I sent it to him.
    I don't work for free like you.

    Wow, walking the dog is getting tiring!
    He want to run and bite!

    Now cool off, you started this and I do not care to keep trying to calm you
    down.
     
  20. Of course it isn't what he wanted. He wanted:
    For a better understanding, just look at these lines:
    Notice the important part:
    Which probably means:

    "just in one package".

    "one" as in "single".
     
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