TPS54821: Long distance to Load/ Layout Recommendation

Martin Seeger

Expert 5381 points

Part Number: TPS54821

Dear Team,

our customer would like to use the TPS54821.

On their board, the load is ~10cm away, so we got the question if we have layout recommendations .

Data sheet information / general SMPS knowledge:

Resistor divider close to the SENSE pin
Pickup point close to the load so that possible traces are also compensated

Is there anything else we should keep in mind?

Looking forward to your feedback.

Best Regards
Martin

over 5 years ago

0 Edwin Zang over 5 years ago

TI__Expert 6425 points

hello Martin,

please place a larger cap near the load.

And the second suggestion you list is very important.

best regards,

edwin.

0 Martin Seeger over 5 years ago in reply to Edwin Zang

TI__Expert 5381 points

Hello Edwin,

thanks a lot for your answer.

Any recommendation in which ration Cout and this new Cload should be?

Best Regards
Martin

0 Edwin Zang over 5 years ago in reply to Martin Seeger

TI__Expert 6425 points

Hello Martin,
It's depended on output voltage and loading. what's the output voltage and loading?

Best regards,
Edwin,

0 Martin Seeger over 5 years ago in reply to Edwin Zang

TI__Expert 5381 points

Hello Edwin,

thanks for the follow up - The customer modified a board and they are happy with the performance. So no need for follow-up at this moment and we can close the topic.

Thanks again and best regards
Martin

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TPS54821: Long distance to Load/ Layout Recommendation