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TPS60400: SW stop condition

T Kishi
Genius 4425 points
Part Number: TPS60400

Hi

My Customer has question.

What happens to TPS 60400 if I subtract 60 mA or more of current?
Does the SW stop?

There is a phenomenon that the customer stops the SW with customers.
Customer would like to know the cause.

Since it is in a hurry it will be helpful if you can comment as soon as possible.

Best Regard

T Kishi

  • 0
    TI__Guru**** 150550 points
    Hi Kishi-san,

    If you have some debugging issue, please post a waveform which shows the issue and the schematic and test conditions.

    These devices do not have the typical current limit. As the output current increases, the output voltage simply drops more due to the output impedance.
  • 0 in reply to Chris Glaser
    TI__Guru**** 150550 points
    Hi Kishi-san,

    Since you seem to have just a small % of units failing, there is likely a manufacturing issue. You can swap the failing ICs with new ICs and see if the problem still persists. You can put the failing parts on an EVM to see if they work there. If the new IC still does not work, start swapping the caps and other components as one of these may have failed (cracked cap, etc.) or suffer from a manufacturing issue.

    Of course, check for solder opens/shorts first to possibly find some clear manufacturing issue.
  • 0 in reply to Chris Glaser
    Genius 4425 points
    Hi Chris

    Thank you for reply.

    Is there anything that seems to be a problem from the circuit diagram?
    Also, in addition to "manufacturing issue", there is a condition that IC stops?

    Regard
    T Kishi
  • 0 in reply to T Kishi
    TI__Guru**** 150550 points
    Hi Kishi-san,

    Since most boards work, I think the circuit is fine.

    Yes, if a pin or cap is open for example, you may not see any switching.
  • 0
    TI__Guru**** 150550 points
    Hi Kishi-san,

    There is no overcurrent protection in this device which would turn it off. As long as Vin is high enough, the IC will be switching.