High frequency Ferrite Transformer design

[deepakchikane]

Dear all

I am looking to search for designing high frequency Magnetics.

i am able to design a area Product(Ap) as per the calonel maclyman.

But for selecting core, there is no AP Value charts in the core.
https://www.farnell.com/datasheets/1872304.pdf

Kindly help to solve the matter.

 

[andre_luis]

I'm assuming that you are referring to the author, "Colonel Wm. T. McLyman" :

The term A_e that you found at the TDK datasheet is the core sectional area, whereas the A_p found on the book is the product of the A_p area by the utilization of the winding surface.

 

[D.A.(Tony)Stewart]

that's Colonel ( sounds like kernel) Bill McLyman (good Scottish name)

Consider 75% copper fill until you specify winding design +/-10% variance.

Consider his software tools
https://kgmagnetics.org/?q=node/5

 

[deepakchikane]

Hi, how to select the core..?

where i will area product of core in the datasheet..??
so i can choose a core for my flyback transformers

 

[andre_luis]

The most widely criterium adopted for choosing the ferrite size is the A_e parameter ( which in the above datasheet is equal to 32.1 mm² ). You can determine its value by using a step-by-step procedure which can vary a few from an author to another.

Although it is possible to find on the web online tools which do that, you can take a look here to understand the factors that more affects the selection :

• Forward and Flyback Core Selection using the LX7309 and

 

[deepakchikane]

Hi Andre,
Thanks for the suggestions.

shall i consider the same Ae= 32.1 mm2as ap(Area Product) for calculations taking reference from Calonel Books..??

Thanks

 

[andre_luis]

I did not made any calculation, but although you can find different literatures showing slightly different calculations due each one include different amount of factors and tolerance , in general all these procedures converge to a result quite similar, therefore it would be expected that based on this other link you find an area not too much different.