regarding synchronus buck DC-DC converter

[sumitj]

har_namana

I have designed buck dc-dc converter in both asynchronous and synchronous mode. In asynchronous i am using diode in place of one mosfet. For asynch converter for large duty cycles it goes to discont mode and current through inductor becomes zero. For synh current through inductor reverses direction and does not become zero.

Does this mean that in synch mode converter does not go to discontinuous mode ??

 

[v_c]

That seems to be the case. I think the difference is in the voltage drop across the diode in the asych case and MOSFET in the synch case. Check out to see what these values are to see if they provide a clue.

Best regards,
v_c

 

[har_namana]

you need a good power electronics book to answer your question because it seems like it is more of a basic question rather than a practical one.

 

[electronrancher]

it's called "forced continuous conduction mode". you can find it on almost all sync. buck converters that use external switches.