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5V from mains

Discussion in 'Electronic Design' started by martin.shoebridge, Feb 23, 2006.

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  1. Can anyone point me in the right direction ? I saw a chip that does this a
    long time ago, but can't remember what/where...
    TIA
     
  2. Tim Wescott

    Tim Wescott Guest

    Web search "off line switcher". Or "smoke".

    --

    Tim Wescott
    Wescott Design Services
    http://www.wescottdesign.com

    Posting from Google? See http://cfaj.freeshell.org/google/
     
  3. : Can anyone point me in the right direction ? I saw a chip that does this a
    : long time ago, but can't remember what/where...
    : TIA
    AFAIR the 5V were not isolated from the mains. Perhaps thats not what you
    want.
     
  4. Does it have to be a chip? They make 5V switching wall warts now that are
    so small they fit inside the mains plug, you can't even really call it a
    "wart" any more.
     
  5. Harris semiconductor did the chip that he probably saw, but I don't think
    Intersil now do it, it seemed to disappear a while ago. These are ideal
    for specific things, such as powering logic circuits inside mains
    equipment, where insulation/isolation is provided elsewhere. However for
    any application where this is not the case, the minature wall wart
    approach is a lot safer. It also simplifies getting approvals, so unless
    the production 'run' is large, may well be the better solution. For a non
    isolated supply, inside a piece of equipment, the PowerIntegrations
    LNK304, is the current popular choice. It is used inside many things like
    lamp dimmer assemblies.

    Best Wishes
     
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