TPS23754: Technical issues

Zhonghui Xu

Expert 5445 points

Part Number: TPS23754

Hi team,

I want to know how to design the resonant inductance of the front section of the main circuit transformer.

Thank you very much for your help.

PS:12V 25.5W PD

Best regards,

over 4 years ago

0 Brett Colteaux over 4 years ago

TI__Expert 3700 points

Hi,

If customer is looking for a high efficiency 12V/25.5W PoE design, I recommend looking at TPS23754EVM-383.

This is an active clamp forward design that is optimized for high efficiency at 92-93% for the DC-DC.

Best Regards,

Brett Colteaux

0 Zhonghui Xu over 4 years ago in reply to Brett Colteaux

TI__Expert 5445 points

Hi Brett,

Thank you for your reply.

When the load is 1.8A, the driving waveform of primary MOS transistor is as follows.

What are the reasons? Output 12V, design power 25.5w

The schematic diagram is designed with reference to demo board 383.

Please help me analyze it.

Thanks again.

Best regards,

0 Michael Pahl over 4 years ago in reply to Zhonghui Xu

TI__Mastermind 21320 points

Hello,

Are you able to share a schematic?

The following paper is a deep dive into designing an active clamp forward, but typically it is easier to use a known working design and compare the differences to the board experiencing issues:

https://www.ti.com/lit/an/slua535a/slua535a.pdf?ts=1613509635915&ref_url=https%253A%252F%252Fwww.google.com%252F

If this post answers your question, please indicate so by marking this thread as resolved. Thank you.

Regards,

Michael P.

Applications Engineer

Texas Instruments

0 Michael Pahl over 4 years ago in reply to Michael Pahl

TI__Mastermind 21320 points

Hello,

Is there any update on this case?

If this post answers your question, please indicate so by marking this thread as resolved. Thank you.

Regards,

Michael P.

Applications Engineer

Texas Instruments

0 Michael Pahl over 4 years ago in reply to Michael Pahl

TI__Mastermind 21320 points

Hello,

I have not heard from you in a few days. Do you have any update on this post? I want to make sure you are setup for success for your project, but if I do not hear from you I will close this thread. Feel free to post here or on a new E2E post to continue the conversation. Thank you

If this post answers your question, please indicate so by marking this thread as resolved. Thank you.

Regards,

Michael P.

Applications Engineer

Texas Instruments

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TPS23754: Technical issues