Paralleling three Flybacks and getting load share?

It has been years but....
If I remember correctly, the error amplifier pulls down hard, up softly. (might have that backwards)
Wire all three Comp pins together. FB pin on two parts goes to ground. Use the last error amplifier as normal.

I phase shifted the three PWM to reduce the input and output ripple.
Any current mode PWM should share well.
Judging by the three 2N3904 you plan on going beyond 50%. (?)

I think the four LT1006 buffers could be simplified.

Its funny how one can draw out a schem for a "great idea"........and you realise its just trash.....the schem of the top post is trash, wouldnt you agree?
This is a job for a UCC29002 Load share controller...more expensive than the schem of the top post , but oh so needed.

UCC29002
https://www.ti.com/product/UCC29002

Just a matter of comparing the old UC3907 , to see if thats any better than UCC29002

UC3907
https://www.ti.com/product/UC3907

The only difference between UC3907 and UCC29002 seems to be that the voltage error amp is inside UC3907 , but not in UCC29002.
The UCC29002 seems to have no 50mV offset, and this offset is needed in the '3907 in order to stop the master from adjusting its own reference...so ucc29002 must have some other trick up its sleeve for this function.

Flyback said:

some other trick up its sleeve for this function.

Click to expand...

So you post a data sheet link so someone else can do your "homework" to tell you the difference. Typical.