TPS568215: Stability analysis

Shinu.V.Mathew

Part Number: TPS568215

Hello Team,

Need your help to verify the stability analysis(BODE Analysis) report of TPS568215. Attached is the report for verification, please help with your comments. Can you please share the stability analysis report done with TI EVM.

Thanks for your help and support.

TPS568215 - 5V_Regulator.pdf

Regards, Shinu Mathew

over 6 years ago

0 Edwin Zang over 6 years ago

TI__Expert 6425 points

Hi Mathew,

Would you like to tell me the test conditions, including input voltage, output voltage, loading? Do I need to change any components on EVM board?

it's meaningful to test according to your application conditions. On default EVM board, it's sure to stable.

By the way, you also can use Webench mode to run Bode analysis.

BRs,

Edwin.

0 Neal Zhang over 6 years ago

TI__Expert 4720 points

Hi Shinu,
The phase margin is fine, only the gain margin seems low. Please share your schematic to get advise about how to modify.

0 Shinu.V.Mathew over 6 years ago in reply to Neal Zhang

TI__Genius 10630 points

Thanks Neal,
Thanks for the comments. Will share schematic.

Regards, Shinu Mathew.

0 Jason Wang (BSR-MV) over 6 years ago in reply to Shinu.V.Mathew

TI__Genius 9550 points

hello Mathew,
As you know, we are in Chinese holiday till 2/11, so the reply maybe delay when you upload the schematic.

0 Shinu.V.Mathew over 6 years ago in reply to Jason Wang (BSR-MV)

TI__Genius 10630 points

Hi Jason,

Thanks for the reply.

Please find the attached schematic, please help with your comments.

schematic TPS568215.docx

Regards, Shinu Mathew,

0 Shinu.V.Mathew over 6 years ago in reply to Shinu.V.Mathew

TI__Genius 10630 points

Hi Jason,

Please help with your feedback.

Regards, Shinu Mathew

0 Neal Zhang over 6 years ago in reply to Shinu.V.Mathew

TI__Expert 4720 points

hello Mathew,

Sorry for the late response. Please remove the feedforward cap c126 and the loop will become fine.

0 Shinu.V.Mathew over 6 years ago in reply to Neal Zhang

TI__Genius 10630 points

Thanks Neal

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TPS568215: Stability analysis