TPS548A20: Stability analysis

Shinu.V.Mathew

Part Number: TPS54A20
Other Parts Discussed in Thread: TPS548A20, TPS53515, TPS53513

Hello Team,

Need your help to verify the stability analysis(BODE Analysis) report of TPS53515, TPS548A20 & TPS548A21. 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.

TPS548A20 - 1V_Regulator.pdf

TPS535513 - 1.2V_Regulator.pdf

Regards, Shinu Mathew.

over 6 years ago

0 Mathew Jacob1 over 6 years ago

TI__Expert 5910 points

Hello,
The reports look okay.
Regards,
Mathew

0 Shinu.V.Mathew over 6 years ago in reply to Mathew Jacob1

TI__Genius 10630 points

Thanks Mathew.

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

TI__Genius 10630 points

Hi Mathew,

Can u please reconfirm whether the stability plot is acceptable for TPS53515. We tried to do the shape level fixing (i.e. giving high signal strength(-10dBm) in lower frequency(<1KHz)) but unable to control the phase oscillations and phase is also starts to rise from negative region.
Please help with your inputs.

Regards, Shinu

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

TI__Genius 10630 points

Hello Mathew,

Please help with your reply.

Regards, Shinu.

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

TI__Mastermind 35185 points

Hi Shinu,

Your TPS53513 bode plot also looks acceptable. It has good phase margin and phase margin. Part of the reason the phase looks like this is "phase wrapping" is probably enabled. This forces the phase display to stay within +/- 180°. To get a better low frequency measurement, you might also want to try reducing the receiver bandwidth to filter out some of the noise.

Anthony

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

TI__Genius 10630 points

Thanks Anthony

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TPS548A20: Stability analysis