TPS54336A: Output Jitter is out of customer's specification

Paul Yeh

Genius 16245 points

Part Number: TPS54336A

Hi Expert,

My customer use TPS54336A to design their system.

Vin=15V Vout=12V/2A but they found output voltage jitter is too big.

Previous design they use ceramic output cap but now they use os-cap.

So could you advise how to reduce the jitter? How to fine tune compensation component to reduce jitter as well?

Thanks

0 Shawn Nie over 5 years ago

Hi,

Could you please share the schematic and waveform? Let's review them.

In addition, you can use Webench to do the simulation for better compensation values.

Shawn

0 Paul Yeh over 5 years ago in reply to Shawn Nie

Shawn,

Below is circuit and testing waveform

0 Paul Yeh over 5 years ago in reply to Paul Yeh

Shawn,

Do you have any document to introduce ceramic acoustic noise with PFM mode during DC/DC operation?

My customer needs this technical document for study.

Thanks

0 Shawn Nie over 5 years ago in reply to Paul Yeh

Hi,

Rcomp is too large, you can reduce the jitter by optimize the compensation values.

And I don't have this document.

Shawn

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