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Change TPS54340-Q1 output voltage

Milo Zhu
Intellectual 2795 points
Other Parts Discussed in Thread: TPS54340-Q1, INA213, TPS54340, TIDA-00160

Hi,

In the TPS54340-Q1 EVM user guide, has one description: "changing the output voltage can affect the loop response. It may be necessary to modify the compensation components", want to know why changing the output voltage will affect the loop response?

Additionally, if add INA213 and sense resistor to realize linear voltage drop compensation like the TI design TIDA-00160, (1) The compensation voltage whether will affect the loop response? (2) The current sense loop whether will affect the TPS54340 loop? Thanks.

  • 0
    TI__Guru**** 191445 points

    For most current mode control schemes, the feed back resistor divider is a gain term in the ac transfer function.  So changing the output voltage may require changing the compensation.  I am not sure what you are trying to do with the second part of your question.  Can you clarify?

  • 0 in reply to JohnTucker
    TI__Intellectual 2795 points

    Hi John，

    1. You mean that resistor divider gain R2/(R1+R2) will change, so the total DC gain will increase and the cross frequency will increase, so need consider modify the compensation components, right?

    2. As for the second qeustion: there is a reference design based on TPS54340 + INA213 + Sense resistor similar with the TI design (TIDA-00160) to realize the linearly voltage drop compensatio, when load increase, the remote USB voltage will basically keep no change, now my question is: As above said, changing the output voltage may affect loop response, now the TPS54340 output will increase to some like 5.5V with some load, so the compensate loop whether would affect the loop response since the output voltage change and there is additional current sense loop, thanks.

  • 0 in reply to Milo Zhu
    TI__Mastermind 35115 points

    As the INA213 is effectively only changing the output voltage it will have the same effect as a change in the resistor divider. This will then cause a slight change in the loop compensation. The change from 5.0 V to 5.5 V in this application is quite small so you may not even notice the difference. However for more extreme changes it is good to check the loop response at the corner conditions.

    Best Regards,
    Anthony