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SMPS design

somanshumehta

Jun 22, 2013
16
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Jun 22, 2013
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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?
 

somanshumehta

Jun 22, 2013
16
Joined
Jun 22, 2013
Messages
16
Please also mention about synchronous rectifiers amd why mosfets are used in it?
 

duke37

Jan 9, 2011
5,364
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Jan 9, 2011
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5,364
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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