![]() ![]() ![]() I’ve owned a few - the whiteface reissue is really special - I like it more than the vintage ones I’ve had. If you have a better idea we will be happy to see your outcome. My switching frequency was YoosefI think that feedback arrangement is worth giving a try. According to Excellent IT for ETD 39 it gives 25 turns for PC40 Material at 80Khz Max guass calculated at 1600My SMPS ETD39 Epcos N87Idle temperature at 30 turns primary and 240vac input was around 40 deg celcius after 30min operation at ambient temp 25 deg no cooling fan. What core temperature you have in idle with your ETD39? At 28 Turns in primary?Maybe there is a reason?designing a good feedback is very complicated.for a good feedback we need to calculate poles/zeros/bode plots/phase margin/gain margin/transient response and other parameters.so i should use this present feedback.why you move to LLC SMPS?i think for smps below 500 watt half bridge is the best choice.isn't that? MicrosiMRunning at 2000 guass at 80Khz is rather a bit rough I guess. Yoosef10 Years ago with my first attempt to build a SMPS, I built that circuit, and it worked fine, it was my first regulated SMPS.But I never completed a regulated SMPS, at least in the last year.But now I am moving to the new LLC SMPS SilvioI had my ETD39 working fine with 20 Turns at primary.
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