Leakage inductance of isolated offline half-bridge transformer

[grizedale]

Hi,

what kind of level of leakage inductance could i expect to get with a standard wound half-bridge transformer for 350W offline half bridge?

-Would you expect more leakage with a flyback transformer?

I will have the primary sandwiching the two secondaries (+-50V)

vac in = 9-265vac

its an ETD44 smps ferrite core, with AL = 1024

 

[Orson Cart]

Leakage below 2uH is good, below 1uH is very good, 2-4uH is average, above 4uH is getting poor...