Isolating Transformer

Discussion in 'The Projects Forum' started by donaldm444, Sep 25, 2012.

  1. donaldm444

    Thread Starter New Member

    Jul 16, 2010
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    Hi,
    I have an isolated transformer I am mounting on a PCB, with isolated transformers do you know if it is okay to connect the negative input terminal to the negative output terminal (e.g. so they share a common ground)?

    Thanks,
    Don
     
  2. crutschow

    Expert

    Mar 14, 2008
    13,003
    3,232
    You can but then it's no longer isolated. :rolleyes:
     
  3. DickCappels

    Moderator

    Aug 21, 2008
    2,651
    632
    Don, Please describe what you mean by isolation transformer. I'm beginning to think that there is more than one definition of isolation transformer at work here.
     
  4. donaldm444

    Thread Starter New Member

    Jul 16, 2010
    23
    0
    The input and output of the transformer is isolated from each other. The model is TDK Lambda PXE3024S12.
     
  5. DickCappels

    Moderator

    Aug 21, 2008
    2,651
    632
    This might be better described as an isolated DC-to-DC converter.

    Yes you can do that.

    An application of this converter with the negative in put and negative output terminals both connected to ground is shown on page 2 of the Applications Manual (URL below).

    http://us.tdk-lambda.com/lp/ftp/Manuals/pxe_single_ins.pdf
     
    donaldm444 likes this.
  6. donaldm444

    Thread Starter New Member

    Jul 16, 2010
    23
    0
    Thank you, I'm not sure why I typed in transformer, I meant DC/DC converter.
     
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