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Lf - this is the inductance of the secondary winding. ie Lf = Lp * (Ns / Np) ^ 2
For UC3845: Vc - this is the voltage at the input of the comparator, ie, output voltage of error amplifier, divided by 3.
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I had a similar problem. In my CCM-SEPIC with Vin/Vo>5 was observed instability. In this case the measured value of the phase margin corresponds to the calculated value, but the gain margin was about 10 dB less. It looked as if the loop has an additional pole increases the negative slope of the...
:oops: Ok, I absolutely agree that the total inductance of series-connected winding will be proportional to the square of the number of turns. However, the topicstarter was interested in the inductance of each of the two magnetically-coupled windings. If the current flows in only one winding...
In sepic there is no serially connected inductors, but only two magnetically-coupled windings (in particular the DC components of the current in the windings, in general, are different). Therefore, in practical calculations one should use the equivalent inductance value of each winding, which is...
I disagree.
In magnetic-coupled inductor each coil cover the total magnetic flux generated by the two windings. With the same number of turns and the same volt-seconds applied to the windings, the total magnetic flux is equal to twice the single-coil magnetic flux.
Therefore, based on a...
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