Anyone here worked on the isolated version of the Cuk circuit?
I'm having to deal with a nasty resonance between the d-s capacitance on my n-FET and the magnetizing inductance of the isolation transformer. Shunt damping helps, but still leaves quite a peak. Is this a commonly observed problem or am I just completely missing something. Any suggestions would be very greatly appreciated!
Thanks,
- Udai
PS - Some extra info:
Energy storage/transformer coupling caps = 30uF, Input/Output inductors = 30uF, n-FET = IR L2203N (Cds approx = 1nF), Operating frequency = 150kHz, Xfrmr n=1 and Magnetizing L = 20uH. |
