# Maximum Flux Density Calculator

The maximum flux density for a core/coil geometry should be calculated to verify that it is below the specified value for a given core, so that the core doesn't saturate. This calculator is useful in matching a core size to the required power.

Note that if there is no DC term, then the calculation is completely independent of the core material.

 Optional DC Terms. AC Terms Vrms (Vrms) F (frequency, use the minimum frequency that the coil will see) (MHz) N (Number of turns) Ac (Equivalent area - the cross section of core) (cm2) Idc (DC current through winding. This is optional) (A) L (Specific to core used. Only enter if, coil has DC) (uH) Bmax (gauss)

### Equations

Bmax=Bmax(AC)+Bmax(DC)

Bmax(DC)= (L*Idc*108)/(NAc)

Bmax= (Vrms*108)/(4.44*F*N*Ac) + (L*Idc*108)/(N*Ac) gauss

Note if no DC current flows, then the second term of the equation is dropped.

#### In terms of AL(uH/100T2):

L= N2AL(uH/100T2)10-4

Bmax(DC)= (N*AL(uH/100T2)104*Idc)/(Ac)

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