LM5160: noisy output

Rami BEN BOUDHINA

Part Number: LM5160

Hi, (exacte part reference is LM5160DNTJ)

i used Webench design to generate this shematic https://webench.ti.com/appinfo/webench/scripts/SDP.cgi?ID=946C4C28798B699C.

I tried using the same component suggested by Webench and i got noisy output.

Can you help me !

You will find attached schematic, layout and scope screenshot:

over 1 year ago

0 Richard Fu22 over 1 year ago

TI__Mastermind 31085 points

Hi Rami,

It looks like the issue is primarily with your layut, as the schematic looks fine. I think the biggest takeaway at the moment is a lack of a ground plane and VIN/VOUT plane. I would refer to this blog post as guidance for reworking the layout.

https://e2e.ti.com/blogs_/b/powerhouse/posts/flybuck-pcb-layout-tips

Thanks,

Richard

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LM5160: noisy output