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TLV62595: Loop Bandwidth of the Regulator

Connor Flack
Prodigy 20 points
Part Number: TLV62595
Other Parts Discussed in Thread: TPS62827, TPS62827A, TPSM82823, TPSM82866A,

Hello,

In order for us to complete our power supply analysis we need to know the loop bandwidth of this regulator. We are not able to find the plot of the loop response in the datasheet for this part and Webench will not allow us to simulate this part. Can you provide us with this plot or a model to do the simulation ourselves?

Thank you,

Connor

  • 0
    TI__Guru*** 145550 points

    Hi Connor,

    We don't provide such models for TLV devices usually.  And I would recommend the pin to pin and better spec TPS62827 instead.  That one also has a SIMPLIS average model: https://www.ti.com/product/TPS62827#design-development 

    The TPS62827A provides a forced PWM mode, which is desired in some applications.

    Finally, we have these integrated power modules, which offer a quicker design: 3A TPSM82823/A and 4A/6A TPSM82866A.

    Thanks,

    Chris

  • 0 in reply to Chris Glaser
    Prodigy 20 points

    Hi Chris, thank you for your response. I appreciate the recommendations for different parts, but in our case we will be using the TLV62595. You say you do not usually provide those models, does that mean you could if we need them?

    Secondly, do you have the loop response graph for this device? 

    Thank you,

    Connor

  • +1 in reply to Connor Flack
    TI__Guru*** 145550 points

    Thanks for explaining Connor.  I just wanted to make sure you were aware of the non-power save mode version (TPS62827A) and that the electrical characteristics of the TPS62827 family are over the full temperature range, whereas TLV62595 specifies most items at 25 C only.  Some applications do not accept either (power save modes or 25 C-only specs).

    No, we do not provide a model for TLV62595.  Some other TLV devices may have a model, but we don't provide them for TLV in general.  The TPS62827 model should give you similar loop response results.

    I don't have a loop response for TLV62595.  The results would very strongly depend on your circuit design as well.  This is measurable on an EVM by adding a ~50Ohm in series with the FB network (both R and C).  That is explained in section 1.2.3 of this EVM's UG: https://www.ti.com/lit/ug/slvube4/slvube4.pdf The loop response plot there (figure 2) should look similar to TLV62595, but the output capacitance and internal compensation are different so the result will be different as well.

    Chris