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TPS63000 and TPS62050 Inrush current

Prescott Siao
Intellectual 2220 points
Other Parts Discussed in Thread: TPS63000, TPS62050

Hi Team,

We use the TPS63000 Vin: 4.2V and Vout: 5V to measure the output inrush current with Cin: 10uF and Cout: 47uF.

The test result show as below.

And 

We use the TPS62050 Vin: 4.2V and Vout: 2.7V to measure the output inrush current with Cin: 10uF and Cout: 22uF.

The test result show as below.

Why the current limit doesn't work?

What value is our maximum recommend Cout?

What sequence are recommend for En and Vin?

Does this inrush current damage TPS63000 and TPS62050 ?

Thanks.

Prescott

  • 0
    TI__Guru**** 150900 points
    These are both rather old devices. What are your Vin, Vout, and Iout needed?

    Where are you measuring the current in the above waveforms? What are the different channels? As explained in the D/S, the TPS63000 limits the input current while TPS62050 limits the peak inductor current.
  • 0 in reply to Chris Glaser
    TI__Intellectual 2220 points

    Hi Chris,

    We measured the Vout and Iout and Ch1 is Vout and Ch2 is Iout.

    The test results show the inrush current of the TPS63000 is 6.38A.

    The test results show the inrush current of the TPS62050 is 1.09A.

    You can see the Transient Response (enable) the Iout go to almost 6A then down to 0A

    Does this inrush current damage these device? 

    thanks.

    Prescott

  • 0 in reply to Prescott Siao
    TI__Guru**** 150900 points
    Thanks for identifying the traces.

    It is not clear what exact current you are measuring. Can you post your schematic, test setup, and place at which you measured the current?

    As well, this app note explains what is typically meant by 'inrush current': www.ti.com/.../slva553.pdf This is current drawn from the input bus during startup.

    If needed, you can send anything customer specific via email.