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Changing SPS output voltage?

Discussion in 'Electronic Basics' started by DaveC, Apr 19, 2004.

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  1. DaveC

    DaveC Guest

    How difficult is it to convert a 12-volt switcher to output a lower voltage
    (ie, 5.0v)? Is is just a matter of changing a feedback resistor or such?

    Thanks,
     
  2. Jerry G.

    Jerry G. Guest

    I would rather add on an external voltage regulator circuit for 5 Volts. If
    you modify the supply, there may be other issues with current control, and
    protection. The higher voltage differential may also cause some heat
    problems under load.


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    How difficult is it to convert a 12-volt switcher to output a lower voltage
    (ie, 5.0v)? Is is just a matter of changing a feedback resistor or such?

    Thanks,
     
  3. CWatters

    CWatters Guest

    It depends very much on the details of the design. Can't answer it without a
    circuit diagram at the very least.

    Colin
     
  4. Ian Stirling

    Ian Stirling Guest

    If you are very lucky, yes.
    Generally at best, you'll get the same ripple, and current capability, and
    regulation.
    At worst, it may not work effectively at that voltage without extensive
    modification.
     
  5. Mjolinor

    Mjolinor Guest

    I have done this succesfully on lots of them. There is quite often a
    potential divider on the output with just two resistors and I have changed
    the ratios to get the feedback the same from the voltage I wanted.

    No guarantees :)
     
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