Hi ThereREF Design POE.pdf
Pls specify what parts consist of the flyback DC-DC in the reference design as attached file of POE.
BRs
Peter Hsiao
Hi Peter,
I'm sorry, I'm not sure I understand your question, can you clarify what you are asking for?
From looking at the file, the design looks more like a forward topology, not a flyback.
You could look at TIDA-050023 for an example of using TPS2373 with flyback design.
If you are wanting flyback design, you would need to change the following:
VCC Input: ACF vs Flyback
Add clamp to primary side:
Secondary side should be either diode or mosfet for synchronous flyback.
Currently you have the secondary side set up for active clamp forward.
Example of Output Diode:
For the transformer T2, can you please send datasheet? To see if this is made for ACF or flyback?
Again, it may be easier to refer to TI's reference design, TIDA-050023
Thank you,
Sarah Lao
Hi Peter,
No worries. I can attach some links for more information on your ACF design.
1. Most important parts of forward topology are the VCC input diodes, secondary side configuration, and the transformer itself.
Two diodes in the VCC input:
Secondary side MOSFETs and gate drive circuit, and an output inductor:
2. PMP21318: 12V/ 6A reference design
PMP21103: 12 V/ 2.5A reference design
3. Debugging guide: PoE Powered Devices Debug Guidelines
Let me know if I can provide any further help.
Best,
Sarah
