Hello,
I am starting to design isolated power supply for Power over Ethernet injector. Frankly speaking, this is my first isolated converter design and I don't know if I'm heading in a good direction.
This should be:
18-60 V input, 56 V output. . Power 35W. And price should be as low as possible.
Industrial purpose.
I am considering using LM5020 controller (flyback) with external transistor. Working around 250 kHz. I am a bit afraid using higher frequency because it will be my first flyback converter. I wish also to use planar power transformer.
I would like to ask if I'm heading in good direction with my design. Maybe I should consider other controller, topology or frequency?
I would be really grateful for any suggestions, materials of similar designs or design tips.
The only reference design I have found is PMP4068, using UCC2809. There are a lot of designs of converters used as power device (48V -> 3.3 or similar) but i have troubles in finding reference designs for power source equipment converter.
Best regards,
Tomas