I will try to search on youtube, thank youI have seen some lectures on youtube by Sam Ben Yakovv. This man is a professor in a university teaching students. I suggest you follow some of these videos and learn the Math behind this topology.
This project was delayed because it turns out that what I have is L6599 (without A) not L6599A.
L6599 has a feature to ensure the resonant tank does not work in capacitive mode via Isen pin.
I was confused because the chip always shutdown after starting until I found this document. View attachment 7012
there is no difference in the L6599 and L6599A datasheet.
Finally I can make this smps work using the method as explained in the design tips
View attachment 7014
The problem reappears when I try to activate the line sensing feature to detect DC voltage in the primary, the chip is always blown.
In the previous design this line sensing was connected to VCC via a voltage divider and could work.
So I decided to buy the L6599A before continuing.
I think that the design tip talking about two different ICs, L6599 & L6699 not L6599A or L6599
and that makes huge sense when you are using different chip.
Hope that helps.
aaaaagh .... thanks microsim, i just realized that this is l6699 not l6599, maybe i was too frustrated yesterday. 4 chip and 2 mosfet blown
but strangely this ebay chip (6599) can work when I treat it like the L6699 design tip
maybe next Saturday I'll try with the L6599A that was just received
This is just the initial test to make sure its main function works.
I have not tried to load test, I expect to be able to get 1000W (with an additional fan if needed)
This pcb will be equipped with an extra +-15V regulated voltage (for preamps)
and +12/24V with mains voltage detection for speaker protector
View attachment 7034