I am trying to understand the typical application example in the datasheet of UCC2863x. Under section "126.96.36.199 Transformer Selection and Design", I am having a difficult time to use the equation 46 in my application parameters. In the equation there is a "relative permeability" variable which is taken as 5500 for the selected core material 3C95. In the material specification document of that material, there is only initial permeability (3000) and amplitude permeability (5000) is given.
How did you obtain the value 5500 for relative permeability? Amplitude permeability is close but not the same. Or maybe we supposed to get the value from the graphs of the material with some parameters like temperature, max flux density etc.
Right now I am trying to select a core for my application which is made of CF139 material. The manufacturer only shares the initial permeability (2100) for that material.
This relative permeability of core materials subject comes across a bunch of times now and if someone explains it to me I would be grateful forever.
Thanks in advance.