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LT3748 not working

Hello Team,

We have designed flyback converter with LT3748. We want output to be 48V with 1.4A capability.

Please find attached schematic of LT3748 Flyback converter. We have done the simulation and simulation circuit works fine.We have used Wurth transformer 750311591 in reverse(secondary is connected to MOSFET side).

There is less voltage at SS(0.556) also no voltage at RREF pin

Can you please help us to resolve this quickly.PDF