Here is an example produced by Ferroxcube for their E38 planar core sets:. Look at the BH curve for the core material and see how much flux density (B) is produced by that H field.Again this will be stated in the core size data sheet. Convert this to magnetic field strength (H) by dividing MMF by mean length of the magnetic field ( \$\ell_e)\$.This is quite simply peak amps multiplied by N. Using peak current and turns calculate magneto motive force (MMF) or \$F_M\$.The core size specification (along with core material chosen) will tell you how many turns are needed for a given inductance: \$L = N^2\cdot A_L\$ is the formula where N is the number of turns and \$A_L\$ is provided by the core size/material in the data sheet.Again the core suppliers will have all the relevant parameters in their data sheets so pick one that might suit your needs. A lot of common ferrite materials are good for 100 kHz but only a few (such as 3F3 from Ferroxcube) are still fairly power efficient for (say) 1 MHz.
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