Hello,
I'm evaluating the use of LT3748 flyback controller for a two-switch flyback topology and I have some concerns.
To drive the two switches, I'm considering either a pulse transformer or bootstrap half-bridge driver but the concerns comes from the RFB pin and the no-opto control scheme.
On the primary side there is a 48V rail and we will transfer the power to 4 outputs as a pre-regulated output for several CCCV converters. Output power is 4x25W and output voltage can swing from 15 to 32 [V] considering cross-load regulation.
* Can I expect problems with the boundary operation mode due to the change in the reflected voltage?
* Do you expect any problems related with the 20uA current mirror since there is a N-MOSFET in between? 
* Is this controller suitable to be used in this topology? so far I didn't have any luck with the simulation. Any other recommended controller?.
Thanks in advance.