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TPS54231 VS TPS5430

Mars Huang
Prodigy 160 points
Other Parts Discussed in Thread: TPS5430, TPS54231

Hi All,
            Why TPS54231 output contains a similar triangular wave signal, TPS5430 will not, is there a way to control it? Thank you.

  • 0
    TI__Guru**** 191445 points
    What are the conditions and what is the circuit? Can you post your schematics?
  • 0 in reply to JohnTucker
    Prodigy 160 points

    Hi John, 

                     Please see circuit, the output waveform is normal?

  • 0 in reply to Mars Huang
    TI__Guru**** 191445 points

    What about the TPS5430 circuit? What is the load current?  Typically you may see larger ripple when in eco-mode.

  • 0 in reply to JohnTucker
    Prodigy 160 points

    Hi John,

                        This is tps5430 circuit, similar EVM BOARD, current consumption is about 350mA, so there may be in the Eco-made? thanks.

     

  • 0 in reply to Mars Huang
    TI__Guru**** 191445 points
    It is difficult to answer. I can tell you that in eco-mode the ripple is greater. I would have to know all the details including the COMP pin voltage.
  • 0 in reply to JohnTucker
    Prodigy 160 points
    Hi John,
    Could you please tell me how to confirm that it is to enter the ECO-MODE?
    Which measurement signal? Thanks
  • 0 in reply to Mars Huang
    TI__Guru**** 191445 points
    You have to look at the SW node waveform. In CCM you will see a rectangular pulse waveform. For TPS54231, the switching frequency is typically 570 kHz. As the load decreases below ILp-p/2, the device will enter DCM. You will see the characteristic DCM waveform where the inductor current goes to zero and the SW node voltage rings prior to the beginning of the next on time. It should still be at 570 kHz. When the load is further decreased, the COMP pin voltage goes to the minimum clamp. At this point the device enters eco-mode. You should see the apparent switching frequency decrease as the load decreases.