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Negative Voltage Offline SMPS

Discussion in 'Electronic Design' started by [email protected], Dec 15, 2007.

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  1. Guest

    Good day everyone,

    Can anyone shed some light on making a negative DC voltage
    mains(offline) SMPS?

    I've designed quite a few offline switchers, but i've always created
    +9 or +12V DC with them. Now, I have a requirement for a -48V DC
    Power supply that runs off of mains (65-280VAC) power. Incidently, I
    need it to give me about 4A (200W).

    I'm familiar with offline switchers, and I know the dangers and
    precautions.

    Any help greatly appreciated!
    Ben
     
  2. Guest

    Oh, Also, Space is tight. All of the offline switchers I've made in
    the past have been somewhat physically large - can anyone give me some
    tips for lowering the size of the footprint (Especially the HEIGHT).

    Thanks again!
    Ben
     
  3. Design an isolated +48 volt supply, and use the positive
    terminal as the common.
     
  4. John Larkin

    John Larkin Guest


    Umm, reverse the outputs?

    John
     
  5. Eeyore

    Eeyore Guest

    ALL power supplies can be negative ones by connecting the '+' output to
    ground.

    Graham
     
  6. Eeyore

    Eeyore Guest

    Use low profile components maye ?

    Surely you could have thought that one through ?

    Higher switching frequencies reduces the size on many of the components
    required too.

    Graham
     
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