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TPS7A47-Q1: Help with TINA simulation bode diagram

Ethan Wang
Prodigy 20 points
Part Number: TPS7A47-Q1
Other Parts Discussed in Thread: TPS7A47

Tool/software:

Hi team,

I want to perform BODE analysis on the following circuit using TINA.

This circuit uses TPS7A47-Q1 as an LDO regulator and connects it in parallel with an NMOS circuit for current expansion.

In this circuit, Q6 is suspected to consume a lot of loop margin, so I want to perform a bode analysis. However, the Bode diagram obtained by simulation does not have the cross frequency, as shown below:

I want to know whether this BODE diagram is normal and how can I analyze it?

See the attachment for the simulation model. 

Positive-LDO-Current-sharing_reference.TSC

Thank you for your support!

Best regards!
Ethan

  • 0
    TI__Genius 13390 points

    Hi Ethan,

    Our current model architecture of the TPS7A47 approximates PSRR, current limit, and a few other key parameters, but does not model the error amplifier's gain or phase response which would be required to accurately model this application. We plan to address this in future model releases, but do not currently have a timeline for that model's release. 

    Best Regards,

    Alex Davis