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TLV62080 EVB test question~

Chen Bogey8
Mastermind 9990 points
Other Parts Discussed in Thread: TLV62080, TLV62084

Dear Sir

We  have test turn on TLV62080 in 5Vin 2.5Vout/1.2A. the out rise waveform is smooth.

but when we modify EVB let output is 1.2Vout/1.2A.(Vin also 5V and just change FB resistor). the output rise waveform are no smooth as enclosed file.

Is there have someting miss, pls advice~~(TLV62084 also have the same problem)

                             Best regard,

                                        Bogey

  • 0
    TI__Guru*** 142860 points
    What is your waveform showing? What are the channels?

    Do you use an electronic load? This usually behave poorly/erratically during startup. Resistive loads are recommended.
  • 0 in reply to Chris Glaser
    Mastermind 9990 points
    C1 is output voltage waveform, C2 is switch node waveform , c1 is output current. here is use electronic load. and my customer is concern this.
    May we check the waveform is normal in TLV62080/62084?
  • 0 in reply to Chen Bogey8
    TI__Guru*** 142860 points
    Can you add Vin and the real output current (measured with a current probe) to the waveform? The bottom channel looks like a math operation done and not the actual load current.

    In any case, this basically shows why electronic loads are not good at transient testing. I'm not sure how you have it set, but once Vout is already at its final level (20% time), the load current is still changing. Then, it seems like there are some small oscillations in load current before Vout falls down. Retest with a resistive load.
  • 0 in reply to Chris Glaser
    Mastermind 9990 points

    Hi Chris

    i re-test EVB in 5Vin/1.2Vout/1.2A start up condition.waveform as attached . CH1:Vsw CH2: output current CH3 Vout.

    i have no find the issue as customer provide. bur the output current is delay Vout around 200uS.

    May you pls help check my test waveform is correct or not?

    equipment : Chroma 63010(Load) TDS2013(OSCILLOSCOPE)TCPA00(current probe) E3634A(power supply)

                                                   Best regards,

                                                                  Bogey

  • 0 in reply to Chen Bogey8
    TI__Guru*** 142860 points
    Yes, this is another common issue with electronic load--they have some delays. This looks normal.
  • 0 in reply to Chris Glaser
    Mastermind 9990 points
    Hi Chris
    thank you for your reply~~