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Davide
09-08-2013 10:15 PM

Difference between Flyback topology and Coupled-Inductors Boost topology

I am working on a new design that requires to quickly charge up to 200V an electrolytic capacitor from a 24V voltage source. I am going to use a dedicated IC from Linear (LT3751) that is designed to control a non-isolated flyback topology.
As far as I can see, making a minor change to the flyback topolgy I get a coupled-inductor boost topology: I have tried to simulate it with LT-Spice and the IC seems to perform good control, exactly as it does with the flyback, with the advantage of a lower voltage stress on the mosfet (because there's no reflected voltage during the switch-off interval).
Does anyone can explain me which are the real differences (pros & cons) between these two non-isolated topologies ? And why one should choose one instead than the other ?
Thanks a lot.
Davide