TPS23753A: Flyback Transformer selection

TT_Chin

Expert 2025 points

Part Number: TPS23753A
Other Parts Discussed in Thread: PMP7355, PMP9175,

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

over 3 years ago

0 Diang Xing over 3 years ago

TI__Mastermind 37111 points

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

0 TT_Chin over 3 years ago in reply to Diang Xing

Expert 2025 points

Hi Diang,

Thanks for your support!

Our height limited of PCB need less than 8 mm, any suggestion transformer of 7W ?

Sincerely,

Shichin

0 Diang Xing over 3 years ago in reply to TT_Chin

TI__Mastermind 37111 points

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

0 TT_Chin over 3 years ago in reply to Diang Xing

Expert 2025 points

Hi Diang,

Thanks for the suggestion.

Do you have the reference circuit design TPS23753A with 749119250 ?

Sincerely,

Shichin

0 Diang Xing over 3 years ago in reply to TT_Chin

TI__Mastermind 37111 points

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

0 TT_Chin over 3 years ago in reply to Diang Xing

Expert 2025 points

Hi Diang,

Roger that, Thanks!

Sincerely,

Shichin

+1 Diang Xing over 3 years ago in reply to TT_Chin

TI__Mastermind 37111 points

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

0 TT_Chin over 3 years ago in reply to Diang Xing

Expert 2025 points

Okay, Thanks!

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TPS23753A: Flyback Transformer selection