Hi everyone,
I'm working on a wide output range off-line flyback design. It's a USB PD design, 3-20V, around 100W. Most books I own are concerned with optimizing efficiency around one load/output voltage condition. In this case, there are several points which need reasonably good efficiency. My current strategy is to start by calculating transformer inductance at the low output voltage condition, and then calculate for the high voltage condition, and perhaps take the average. Or maybe push the design point to somewhere around 2/3 maximum power. I don't know if that makes any sense. I know this is a super vague question, but am struggling to find a good starting point!
Thanks,
Tim