Switching Regulator (RECOM) - how to tell what frequency it switches at?

Discussion in 'General Electronics Chat' started by bob332, Aug 2, 2011.

  1. bob332

    Thread Starter Member

    Feb 14, 2011
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    i have some RECOM units - http://www.recom-power.com/ in the 78XX size. the ds - http://www.recom-power.com/ says they switch between 280KHz - 380KHz and typically 330KHz. now if these were used for rf wouldn't that be an issue if the switching frequency was in line w/ the freq you were using for the rf unit? is there a way to know exactly what freq the unit switches at? or am i way of in this thinking?
     
  2. praondevou

    AAC Fanatic!

    Jul 9, 2011
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    What component exactly you mean? Which model?
    If it's an encapsulated switching regulator, you may find out it's frequency by putting the oscilloscope probe near the regulator or putting the probe on the in/ or output without connecting GND .

    There will be some oscillation to see on the screen and since you know the frequency range you'll know what freq it is.
     
    Last edited: Aug 2, 2011
  3. mik3

    Senior Member

    Feb 4, 2008
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    Put the scope on the gate of the switching MOSFET.
     
  4. bob332

    Thread Starter Member

    Feb 14, 2011
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  5. mik3

    Senior Member

    Feb 4, 2008
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    With no scope, trust the datasheet!
     
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