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TPS61023EVM-052: Output current failure

Mathias Ferreira
Prodigy 10 points
Part Number: TPS61023EVM-052
Other Parts Discussed in Thread: TPS61023

Tool/software:

Hello,

I am trying to use the TPS61023EVM-052 to test my design. It consists of the same feedback resistors found in the devkit (to set the output to 5V) but with the XGL4015-681MEC inductor, which meets the necessary parameters to increase the output current up to 2.7A according to the TPS61023 datasheet. My goal was to use the devkit to test if my design works correctly, but when testing the devkit without making any modifications, I found that it cannot supply a current of 0.8A, even though the datasheet says it should work correctly up to 2A. I performed the test by powering the devkit with a 3.6V voltage source and using an electronic load to select the consumption current. Everything went well as I increased the current, but when reaching 800mA, the output voltage dropped to 0V. I would like to understand what is happening and why the devkit is not functioning as it should.

Thank you very much.

Regards, Mathias.

  • 0
    TI__Expert 8695 points

    Hi Mathias,

    Please give me the waveform of Vin, SW, Vout in the same screen. Set oscillograph with single trigger mode and trigger Vout falling edge to capture the moment when Vout falls. 

    And please check if your input voltage source can output up to 3.7A.

    Best Regards,

    Travis

  • 0
    Prodigy 10 points

    Hi Travis,

    Thank you for your quick response. I have included below the capture that you asked me for, the violet signal is Vout, the green signal is Vin and the blue signal is Vsw. Additionally, I verify that the voltage source can supply up to 5A.
    Regards, Mathias.
  • 0 in reply to Mathias Ferreira
    TI__Expert 8695 points

    Hi Mathias,

    Please check your schematic for input path and see if there's anything that limit the input current. As we can see in the waveform the Vin drops first and Vout only drops when Vin drops to 1V. Try sinking current on Vin with your e-load and see on what current did Vin started to drop

    Best Regards,

    Travis