This thread has been locked.
If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.
Hi,
I would like to design PoE PD 802.3at Type-1 class-2, 7W and suppose using TPS23753A solution.
Do you have any suggestion Flyback transformer part can provide to me for reference?
Because our PCB space is limited and want to find a small size of Transformer and the transformer only support output 7W@5V. or 7@12V.
It doestn't need to support 12.95W.
Thanks!
Sincerely,
Shichin
Hi Shichin,
Thanks for reaching out to us!
I attached some transformer part number with length information. Please let us know if the following items could help.
7W@5V, sec diode:
POE70P-50L (13.2mm)
7W@12V, sec diode:
POE70P-12L (13.2mm)
10W@5V, sec synchronous FET:
50314433 (17.75mm)
LDT0807-50R (12mm)
Best regards,
Diang
Hi Diang,
Thanks for your support!
Our height limited of PCB need less than 8 mm, any suggestion transformer of 7W ?
Sincerely,
Shichin
Hi Shichin,
Thanks for your follow-up!
For the height consideration, you could choose 749119250 (7.4 mm height): 5V Vout, 1.41A Iout.
The datasheet is:
https://www.we-online.com/catalog/datasheet/749119250.pdf
Best regards,
Diang
Hi Diang,
Thanks for the suggestion.
Do you have the reference circuit design TPS23753A with 749119250 ?
Sincerely,
Shichin
Hi Chichin,
Sorry that I do not think we have reference circuit with 749119250. While you could look into the following reference designs and make some minor modifications.
PMP7355: 5V, 2A, Class 3,Cost-Optimized,Flyback Converter Reference Design for PoE Applications
PMP9175: 5V, 2.3A, High Efficiency Synchronous Flyback Converter for PoE Application Reference Design
TPS23753AEVM-001: 5V, 1.4A, low-cost, simple, 7-W flyback converter applications
Best regards,
Diang
Hi Shichin,
I will close this thread for now. You are welcomed to ask us in E2E if you have any further questions!
Best regards,
Diang