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TPS82130: question

Yasushi Fujiwara
Genius 12725 points
Part Number: TPS82130

Hi experts,

My customer is designed a board which is adopted TPS82130. Customer is reported that output current is strange phenomenon when device is turned on. I summarized customer test condition and result as attached. Would you verify it?

TPS82130_question(10012019).xlsx

Best Regards,
Fujiwara

  • 0
    TI__Guru 50120 points

    Hi Fujiwara-san,

    What is the typical load current that the customer board is expected to pull? From the scopeshot it looks like the load is momentarily on and then shuts off until the phenomenon in question happens. The output voltage is stable at 3.3V so the device is in regulation. Have you tried connecting the EVM directly to a resistive load or eload to check functionality? 

    I will contact the appropriate apps engineer to get his feedback on this MV power module. 

    Regards,

    Jimmy

  • 0 in reply to Jimmy Hua
    TI__Genius 12725 points

    Hi Jimmy-san,

    The load current of test condition is 50mA. Customer already tested by a resistive load as shown below. Would you please verify whether the phenomenon is normal operation or not.

    TPS82130_question(10032019).xlsx

    Best Regards,
    Fujiwara

  • 0 in reply to Yasushi Fujiwara
    TI__Genius 17905 points

    Hi Fujiwara-san,

    I would not normally expect negative current with TPS82130 because its Power Save Mode in light load is in discontinuous conduction mode.

    What current probe are they using? How do they connect their custom load board to the EVM -- how long are the wires? Does the negative current amplitude change depending on where along the wires they place the probe?

    For the first Excel file you shared, is it possible to get x-axis (time) zoomed in so I can see more details of the current waveform?

    I can try to duplicate the setup once you share above. You may also suggest to try using a small series resistor and measure voltage drop to sense the load current instead of current probe to see if they also observe the negative current.