Yeah I can't see how you could possibly calculate core area from that datasheet. And I don't see why you would need to know that either. It says that Bmax is 2000G (200mT), along with the secondary inductance/ESR, so that is enough info by itself to derive its max Vt and avoid saturation.
Okay I see what you mean. Yes I also calculate 2.66mm^2 (assuming in their equation D is a percent, so 50% would mean D=50). That seems like a reasonable number given their mechanical drawings.
And which equation do you use to know if saturating or not??
Is it this equation?
Bmax = Ls x Imax x 10e4 / ( Ns x Ae)
Where Ls : Secondary inductance. in Henry
Imax : the secondary current in A
Ns : secondary turns
Ae : effective cross sectional Area in cm2
Bmax : Maximum flux density in Tesla
There isn't much to calculate. The "formula" tells how flux translates to B for the given core.
You get 1/(37.59*10^3 ) = cross section m². You are simply reverse engineering how the author came to the equation: He has put in the datasheet Ae value of 2.66 mm².
The other question is, how you calculate the core flux (and check it for possible saturation) under different operation conditions. The "application circuit" in the pulse data sheet and the respective equation have some problems.
- you would never connect a single wave rectifier to a current transformer secondary without some additional parallel load or freewheeling means
- the equation doesn't consider the diode voltage drop and is only correct for rectangular current waveforms and discontinuous mode