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WEBENCH® Tools/LM5155: LM5155 not full power

Emmanuel Roble

Intellectual 405 points

Part Number: LM5155

Tool/software: WEBENCH® Design Tools

Hi,

I made a prototype following the layout in datasheet/evm with values taken from the LM5155 calculator tool. But on my actual test the output voltage drops at just ~2.5A output. I have attached the schematic, pcb layout and LM5155 spreadsheet calculator. Can someone help me if I may have missed something?

Thank you,

Emman

over 4 years ago

0 Emmanuel Roble over 4 years ago

Intellectual 405 points

0 Youhao Xi over 4 years ago in reply to Emmanuel Roble

TI__Guru 74420 points

Hi,

Thank your for designing with the LM5155. It looks like your circuit hit peak current limit. Can you reduce your sense resistor and see it helps?

Regards,

Youhao Xi, Applications Engineering

0 Youhao Xi over 4 years ago in reply to Youhao Xi

TI__Guru 74420 points

May I assume the issue is resolved and close the thread here? You are welcome to re-open the thread by adding a new post.

Thanks,

Youhao

0 Emmanuel Roble over 4 years ago in reply to Youhao Xi

Intellectual 405 points

Hi, Yes this is ok. The discussion is on another thread.