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TPS2321: Troubleshooting

Andres Gomez
Intellectual 320 points
Part Number: TPS2321
Other Parts Discussed in Thread: TPS40054

Hi.

We have a problem with the Hot Swap Controller. If we connect the load after the Hot-Swap Controller, there is a fault by overcurrent; however, if we connect the same before the hot-swap controller, then the regulator works properly. Also, this only happens when the load is ON and the Switching Supply is Off. If we have the Switching Supply ON, and then we turn on the Load, it doesn't present any fault. We are using TPS40054 as a regulator. This starts happening after several days testing our new mosfets in the Buck Regulator.  

  • 0
    TI__Mastermind 30915 points

    Hi Andres,

    Thanks for reaching out to us. We will get back to you by tomorrow. 

  • 0 in reply to Avishek Pal
    Intellectual 320 points

    Hi Avishek,

    Today we removed the FETs that were connected to the swap controller and replaced them with a short circuit. We did this because we thought those FETs might be causing the problem. We obtained these waveforms: yellow is 5V1, blue is fault, and purple is gate. There is a delay between the output and control signals.

    This waveform shows full-load conditions with a current of 6A (it is also the same with No-Load)

    However, the module that works properly shows that the control signals are activated before the output rises. This is the correct behavior, as the NFETs should be activated to deliver power to the output.

  • 0 in reply to Andres Gomez
    TI__Mastermind 30915 points

    Hi Andres,

    Sorry to say, I am not able to understand your issue. Can we talk tomorrow some time? If yes, I will share my email ID through private chat for sending the meeting request.

  • 0 in reply to Avishek Pal
    Intellectual 320 points

    Ok no problem. If it's not too much trouble, would it be possible to have a confidential agreement in place before sharing any information about the schematic? This would help ensure that any sensitive information remains protected and only used for the intended purpose. Thank you for your understanding.

  • 0 in reply to Andres Gomez
    TI__Mastermind 30915 points

    Do you have NDA with TI? If not, please reach out to the TI's regional technical sales representative or field applications engineer.