Hsaturation of toroid ferrite core electronic ballast oscillator

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phobos1

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For oscillator design in electronic ballast I bought a 10/6/4 toroid ferrite core i want the Hsaturation value to find the number of turns i should wind. i am using a hinoday ferrite of msb-5s material grade. some one please help me to find the Hs.
The bsat is 480mT. ui = 3000


I tried with u=b/H and got some 1.27 but i dont know what i got is right or wrong.
 

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