TPS54260-Q1: Question when VIN=5.6V

Chuqiang Wen

Part Number: TPS54260-Q1

Tool/software:

Hi team,

Could you please help take a look on below waveform? Why Vout have undershoot periodically when VIN=5.6V? The output load is very small at this moment. Please help provide some possible reasons to locate the root cause.

Blue one(CH2) is Vout, yellow one(CH1) is VIN. Others are not directly probe from TPS54260-Q1 PINs.

Thanks!

Ethan Wen

4 months ago

0 Onkar Bhakare 4 months ago

TI__Genius 15156 points

Hello Ethan

Could please share entire schematic? it would help in debugging.

On the first look it appears to be a Boot-UVLO issue. Could please help capturing BST-SW waveform the converter along with Vout and SW. Differential probe would be an ideal choice for capturing BST-SW. However, if it's not available MATH would work too.

Thank you

Regards

Onkar Bhakare

0 Onkar Bhakare 3 months ago in reply to Onkar Bhakare

TI__Genius 15156 points

Hello Ethan

Any updates on this?

Regards

Onkar Bhakare

0 Onkar Bhakare 3 months ago in reply to Onkar Bhakare

TI__Genius 15156 points

Hello Ethan

I am closing the thread due to inactivity. Feel free to reopen at any time.

Thank you

Regards

Onkar Bhakare

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TPS54260-Q1: Question when VIN=5.6V