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TPS746: Power off ringing

Naizeng Wang
Expert 3745 points
Part Number: TPS746

Hi team,

I'm testing TPS746EVM. The input voltage is 5V. Output voltage is 3.3V. Output current is 1A. 

When the input voltage drops to zero, the output voltage waveform has strange ringing. CH1 is input voltage, CH2 is output voltage. I would appreciate it if you could tell me the reason.

  • 0
    TI__Mastermind 23361 points

    Hi Naizeng, 

    With Vin near 0V, the LDO is off and the output voltage should be near zero as well. The small voltage glitches may be related to the grounding of the probe from the scopes. I would suggest you connect both grounds of the two probes and redo the tests; you could also try a different prob and see if the ringing disappears. 

    Regards, 
    Jason Song

  • 0 in reply to Jason Song
    TI__Mastermind 23361 points

    Hi Naizeng, 

    It has been more than two weeks and we have not received any feedback from you. We assume your issue has been resolved, if this is not the case, please simply let us know. 

    Regards, 
    Jason Song