2 switch flyback no good....it has only one output diode for the high current whereas two tran forward shares the current between the 2 diodes.
You just need a high side fet drive but that can be done with a bootstrap high side drive chip
Katmandu, i think you have a good plan. I would stick with 50% duty or less and use slope compensation. Then you have a multitude of chip choices from all semi manufactures.
48->24vdc could be via (synchronous) buck , so i hope you do need the isolation
While its true that a forward topology does not need an air gap, the core will not be any smaller.I would like to use a forward topology as it doesn't need a gapped core and the core itself could be smaller.
Is there any (other) downside I'm not aware of?
The flyback transformer you already have should work fine with the dual switch flyback topology.Many thanks for this comprehensive insight! That's it, I'll stay with the (dual-switch) flyback topology.
Is there any problem if I'm going to use the same xformer (coupled inductors) from the former one-switch flyback design?
The dual switch flyback allows you to limit the off state voltage on the fets, to less than with a single switch flyback, but your vin is only 48vdc, so i am not sure if its really worth doing twoswitch flyback for yourself..what is your reflected voltage to the primary?
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