The following website: http://www.ti.com/tool/PMP9517 has a power supply design which I am considering using in one of my applications.
The top of the page says small form factor 10W offline flyback power supply reference design. Down the page on the left there is a spot
where you can download the schematic for this design. In the schematic there is a transformer that is labeled EPC17. Can anyone shed
any light on what this transformer really is. When I google EPC17 it says that it is a ferrite core and gives the dimensions of the ferrite core.
This transformer is a critical part of the design and without knowing exactly what it is the schematic is fairly useless.
Another thing I had a question about on this schematic is the inductor that is in parallel with a 6800 ohm resistor on the primary side. When I
googled the inductor I found that this inductor is a 1000uf cap and this makes the imoedence at 60 Hz equal to about .35 ohms. I don't understand
at this point why the 6800 ohms would be in there at all since it's effect will be very minimal when placed in parallel with a .35 ohm inductive impedence.
Thirdly, the two capacitors that are unlabeled in the secondary. Are they unlabeled because their sizes would depend on the current output
capability you desire?
If anyone can shed any light on any of the above it would be greatly appreciated.