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N1= Uimin [V] • δprim
2 • f [kHz] • Bpeak [T] • Ae[mm2]
N1 = • 
2 •

N1 - primary winding turns
Uimin - minimum input voltage
δprim - duty cycle primary signal
f - switching frequency
Bpeak - peak flux density
Ae - effect. cross-sectional area