DC DC Converters

Discussion in 'General Electronics Chat' started by Sidra Khan, Nov 25, 2015.

  1. Sidra Khan

    Thread Starter New Member

    Sep 16, 2015
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    i a using an isolated DC DC converter..i wanna know if i don't short the -ve output and input ground annd want to use the -ve output as gnd for the rest of circuitry, how would i do it actually?
     
  2. crutschow

    Expert

    Mar 14, 2008
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    If the converter is truly isolated then you can connect the input ground and output ground wherever you want.
    The only restriction would be the isolation voltage limit between the input and output (which is usually stated in the spec sheet).
     
  3. Dodgydave

    AAC Fanatic!

    Jun 22, 2012
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    What is the model number of the converter, or circuit diagram?
     
  4. Sidra Khan

    Thread Starter New Member

    Sep 16, 2015
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    you mean that if i am using 24 to 12v converter i will connect 24V and GND to input + & - pins and can get 12V and gnd at out + & - pins. And i can connect the rest circuitry to these output pins! it will work correctly?
     
  5. Sidra Khan

    Thread Starter New Member

    Sep 16, 2015
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    i am using vicor VI-j00
     
  6. MikeML

    AAC Fanatic!

    Oct 2, 2009
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    24Vin between 1 and 4; 12Vout between 5 and 9. You can tie 4 to 5 or 4 to 9, or not tie input to anything on the output.

    vicor.gif
     
  7. AnalogKid

    Distinguished Member

    Aug 1, 2013
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    That is a cranky old part. Any reason you are not using their 2nd gen (Maxi, Midi, Mini) bricks? I've found them to be still a bit Vicor-weird, but not as weird as the VI-J.

    ak
     
  8. Sidra Khan

    Thread Starter New Member

    Sep 16, 2015
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    if i don't tie any input to -output, can i still use -output as gnd to drive the rest circuitry?
     
  9. Dodgydave

    AAC Fanatic!

    Jun 22, 2012
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    Yes, you can do what you like.
     
  10. MikeML

    AAC Fanatic!

    Oct 2, 2009
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    Yes. But dont call that electrical node "Gnd" unless is connected to a metallic rod driven into the earth. A better name is oV or Com.
     
  11. Iqra Mehmood

    New Member

    Jan 3, 2016
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    for emi reduction, how will i connect emi filter before dc dc converter and what about grounding?
     
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