Hello everybody i have a question on Bmax calculation for the numbers of windings of a ferrite transformer
N(prim) = Vin(nom) x 10°8 / 4 x f x Bmax x Ac
(i dont have the numbers of turns!) thanks a lot

 

? https://www.google.com/search?q=find+max+flux+density+for+frequency+ferrite+inductors

 

Sorry a need only the value of Bmax in tesla or gauss for a etd34 thanks!

 

hello can anybody help me?

 

Check the datasheet for the particular ferrite core that you have.

 

Hello everybody i have a question on Bmax calculation for the numbers of windings of a ferrite transformer
N(prim) = Vin(nom) x 10°8 / 4 x f x Bmax x Ac
(i dont have the numbers of turns!) thanks a lot

Bmax is limited by whichever ferrite material you use. As @Alec_t says, look at the datasheet for your core.

 

Ok thank you i check it on datasheets!

 

Just checked the data sheet of my ETD34
i have found no tesla or gauss value!
can everybody help me for tesla or gauss calculation?
thank you

 

here is the file

 

Typical we assumed the B_amx around 250mT or less.
But what you want to calculate?

 

Hello Jony130 thank you for your answer! i want to calculate the numbers of windings of the ferrite transformer for a power swiching supply!

 

So the estimation of Bmax to 250mTesla can work with this formula:
=(12x10°8)/(4 x f x Bmax(250) x ac)
thank you

 

Some one could tel me if the formula can work?
thnks

 

Look here
http://tahmidmc.blogspot.com/2012/12/ferrite-transformer-turns-calculation.html

I you can also use this page
http://schmidt-walter-schaltnetzteile.de/smps_e/smps_e.html#Ivw

 

By the way, in the datasheet the abbreviation mT is used for flux density (milli Tesla).

 

Ok Jony130 i wil find the gauss that i need ! thank you!
Thank you Dcappels i will check that!

 

So the value of the core is 97mm²
the formula is for etd34
(12X100000000)/(4X(100000KHZ)X(330BmT)X0,97)=9,37 turns! is that too much?
thank everybody!

 

And for this equation yot have given you need to plag the flux density in Gauss not in Tesla.
Effective cross-sectional Area in cm2 and the frequency in Hertz

 

Ae effective area =97mm²
so if i convert tesla in minitesla and frequency khz in hz i do:

(12X100000000)/(4X100000hzX330BmTX0,97mm²)= 9,37! is that rigth?

 

is bmax in tesla correct (mt 330)?
thanks!