Dear arkanwe
Hi
That drop has some meaning :
1- your out put inductor hasn't gap space or enough gap space . ( create enough gape space at it's core.)
2- ESR of your capacitors ! as i saw , you used 3 cap in series together thus , you'll have summation between , three ESR .
And remark : i think you can take your feed back with an opto coupler to provide isolated out put .
Best Wishes
Goldsmith
The attachment isn't working, try again.Here is the actual circuit schematic tested.
Please!!!, pay attention with the net names, some of the nets are linked by name, not by a line draw.
**broken link removed**
High transistor stress is a good reason to use a half bridge design in some cases, but there are other topologies (like diagonal half bridge and flyback) which also have this benefit, and are able to work properly with gate drive transformers. Half bridge only makes sense if you're working with high power levels and want optimal transformer sizing, but you're only working with 100W, so half bridge isn't necessary.I've used a half bridge topology because the high voltage levels on primary and specially secondary. I thought that the transistors will be fatally stressed by the voltage peak during the off on the primary of the flyback.
Your gate drivers shouldn't work well by design. You're losing half your drive voltage in those resistors, and the one with a higher duty cycle will have further reduced drive voltage during its on period. If, as you said before, your FETs are getting warm with no load on the output, then you have a problem and that gate drive circuitry is definitely part of it.The gate drivers work fairly well. Could be better, shure, but I don't want put it more complex. They are very similar to the ones you can find on a ATX power supply. Maybe it's a good idea to lower R21 from 220Ohm to...22 Ohm.
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