- Jan 22, 2008
That should correlate, but the model with lumped elements does not describe all the details. I have often found that the practical results are slightly better than the simulation based on lumped elements, just like simulating a transmission line with not enough cells produces pessimistic results.The bigger cores are on back order so they want come soon
But from the 3k9 source measurement one can extrapolate the freq response of my toroid with a 220r source impedance, I know the high end behavior is more complex than a low pass filter, besides capacitance it has leakage inductance etc... it has self resonanse I cant see.
In the low end the -3db is at 2Hz because inductance rises at low Hz to 16 H.
At the high end the measurement indicates -3db roll off at 120KHz
Would it be correct to calculate self resonance freq. by having total capacitance from freq plot: 5n8 + measured leakage inductance?