I have designed SEPIC/CUK from ADISIMpower Excel Sheet with 2.7-4.5 Vin to +/-5.5 at 0.4A. Due to low ripple requirements and low Vstep, Output caps are large like 3x 100u for each.
Similarly, just for study purpose I simulated LT3579 SEPIC Converter. When I increase number to output capacitors or decrease soft start Cap, SW of LT3579 stop switching with fault condition. Looking at ADP1614 output capacitors and no soft start, is there a link between soft start and fault condition? Please tell if I am doing anything wrong with ADP1614?