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SMPS design

Discussion in 'General Electronics Discussion' started by somanshumehta, Jun 23, 2013.

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  1. somanshumehta

    somanshumehta

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    Jun 22, 2013
    Actually I am designing a 12V to 19.5V dc-dc converter for my notebook.To select among different topologies I need to know the difference between flyback and resonant SMPS?
     
  2. somanshumehta

    somanshumehta

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    Jun 22, 2013
    Please also mention about synchronous rectifiers amd why mosfets are used in it?
     
  3. BobK

    BobK

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    Jan 5, 2010
  4. duke37

    duke37

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    Jan 9, 2011
    Mosfets are used because they have a very low resistance if turned on fully. A diode will have drop a considerable forward voltage, perhaps 1V.

    When rectifying 100V a 1V drop is not too serious (1%). but if rectifying 3V it is a dramatic loss. Schottky diodes are better at low voltages but cannot match a mosfet.
     
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