Hello.
I have built a phase shifted converter based in the UCC28951 from TI, but I have problems with stability. The load has built-in capacitors and the converter oscillates wildly. I have changed the Type-II compensator to a Type-III one, but oscillations do not stop. Calculation of the Type-III compensator is based in application note SLVA662 from TI.
The input voltage is 48 V, output is 311 V, nominal output power is 600 W and the output capacitance is about 2000 uF. Fsw = 100 kHz.
Is this kind of converter valid at all for this output capacitance?