input voltage = 5Vdc and Output voltage = 150Vp-p.

Frequency(f)= 384KHz

the above data has been verified in oscilloscope.

The primary side consists of two center tapped.

its a two E shape cores connected in the bobbin

its TDK E40 ferrite core , With Ae=1.49cm^2 and Bmax= 1800(considering) [Range is 1300-2000]

I know the formula to find Number of turns in Primary which is: Vin*10^8/(4*f*Bmax*Ae).

My doubt is, here the frequency is so high that using this formula, number of turns is not even equal to 1. How to find the number of turns in this configuration? can anyone help? Thank you in advance. I hope my question is clear to the readers