LM5168PEVM: the layout for ripple generation portion

Noriyuki Takahashi

Part Number: LM5168PEVM
Other Parts Discussed in Thread: LM5169,

Tool/software:

Hi team,

They want to use LM5169. Based on the datasheet, they need to take care the layout of the feedback portion. However, there are no description about the layout for ripple generation portion.

So looking at the LM5168PEVM, the layout for ripple generation portion also follow up on the same method with the feedback portion as figure below. Could you confirm whether TI recommeds the layout of ripple generation portion needs to follow up on the same method with the feedback ortion?

Regards,

Noriyuki Takahashi

2 months ago

+1 David Baba 2 months ago

TI__Mastermind 38310 points

Hello Noriyuki,

Please follow the EVM layout.

Thanks.

David.

0 Noriyuki Takahashi 2 months ago in reply to David Baba

TI__Genius 10690 points

Hi David,

Please let me ask one more question.

As below figure, it seems some distance is required between SW-pin and ripple generation portion/feedback circuit. Could you tell how much distance they need as recommendation?

Regards

Noriyuki Takahashi

0 David Baba 2 months ago in reply to Noriyuki Takahashi

TI__Mastermind 38310 points

Hello Naoriyuki,

some of the ripple generation traces are close to the SW node as it makes its way back to the device. Please try to keep it away as practically possible, but most important is keep the ripple generation is routed differentially as shown.

Hope this helps.

David.

0 Noriyuki Takahashi 1 month ago in reply to David Baba

TI__Genius 10690 points

David,

Please let me ask one more question.

Should the feedback path and ripple injection path patterns be routed in parallel like a development board? Or is it better to separate them as much as possible?

Regards,

Noriyuki Takahashi

+1 David Baba 1 month ago in reply to Noriyuki Takahashi

TI__Mastermind 38310 points

Hello Noriyuki,

Yes, make it like the dev board.

Thank you.

David.

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LM5168PEVM: the layout for ripple generation portion