smps

Discussion in 'General Electronics Chat' started by cryosar, Oct 5, 2010.

  1. cryosar

    Thread Starter Active Member

    Apr 2, 2009
    40
    0
    Hi everybody,
    can anyone help me in this. I have two output voltages from a smps. for example 5V & 12V. sometimes i want to use 5V & othertime 12V. how to design this. how to switch from 5V to 12V?
    Thanks in advance
     
  2. Wendy

    Moderator

    Mar 24, 2008
    20,764
    2,534
    SMPS are usually (but not always) like conventional linear power supplies in that they have a voltage reference. If you can change the voltage reference for the regulator with a switch the output will follow.
     
  3. marshallf3

    Well-Known Member

    Jul 26, 2010
    2,358
    201
    Are you trying to design an SMPS that will be able to switch from one output voltage to the other?

    What's the original input voltage and the output current requirement at each of the voltages?

    What do you have so far?
     
  4. cryosar

    Thread Starter Active Member

    Apr 2, 2009
    40
    0
    Yes
    input voltage 85 to 265 VAC
    Output voltage 12V & 5v
     
  5. Vasanthkini

    Member

    Jun 9, 2010
    40
    2
    You might as well use a MOSFET which switches between the two reference's (5V&12V),if your out put needs to switch with respect to time.Switch the MOSFET at the same rate.


    Thank You!
     
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