WEBENCH® Tools/LM5176: LM5176

user4332422

Part Number: LM5176

Tool/software: WEBENCH® Design Tools

Hello,

I using LM5176 for 15V 25A power. I found the output voltage touch OVP voltage(17.3V VFB 0.882V) during no load condition. If I add 20mA resistor load to output the out output voltage back 15V.

How can we slove this problem?

Vin 12V,

Vo set 15V, measure 17.3V during no load.

Lei

over 5 years ago

0 Brigitte over 5 years ago

TI__Guru 70785 points

Hello Lei,

Please share your schematic. Normally the FB voltage should not get such high.

0 user4332422 over 5 years ago in reply to Brigitte

Prodigy 110 points

This problem just for no load. With 20mA load then Vfb is 0.8V. Rsense 2m Ohm, L 10uH.

0 user4332422 over 5 years ago in reply to user4332422

Prodigy 110 points

4101.LM5176.pdf

0 Brigitte over 5 years ago in reply to user4332422

TI__Guru 70785 points

Hello user4332422,

Thank you for the schematic. It seems that just one page is in the pdf and the power stage is missing.

Are you measuring the feedback voltage on the FB pin and use AGND pin as reference?

0 Brigitte over 5 years ago in reply to Brigitte

TI__Guru 70785 points

Hello user4332422,

I expect that you have been able to solve your issue and will close this thread now. If this is not the case, please post again here, or create a new thread if this one is locked.

Power management

Power management forum

WEBENCH® Tools/LM5176: LM5176