RODALCO the street light driver looks interesting....As you say its 56 LEDs in total. It looks like theres 6 DCDC LED
driver PCBs there. It seems unusual to use so many separate boards but maybe they want that if one fails, the remaining
ones can keep going.
I can see the PFC stage, and then the main Switching converter, interestingly I don't see any resonant capacitors, but I
do see a secondary side big inductor, which suggests either Half Bridge, Full Bridge, or two transistor forward
converter..........
-probably say not half bridge as I cant see a current transformer.
-probably say not full bridge because I cant see enough transistors, and also the powers not likely to be high enough.
-So probably Two Transistor forward converter.....but I can't see the high side gate drive transformer, so that's also in
doubt.
-possibly a one transistor forward converter....but that's a devil of a converter to put after a PFC stage because of the
high FET OFF drain voltage, also it needs the third reset winding.
-Could be an active clamp forward converter though.
If we knew the controller IC then that may give it away.