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TPS25980: TPS259807ONRGER Cannot restart

ZB xu
Prodigy 20 points
Part Number: TPS25980

Tool/software:

Hi expert,
In mass production, the E-FUSE used for 24V experienced a surge current and tripped during power startup, and the retry function (RETRY) could not function properly and could not be restored afterwards.
The trip current threshold set now is 7A, but the current during trip is 6A.
Even if a jump occurs, the inrush current should only flow once during startup, and then it should be able to be restored through the retry function, but it cannot be restored normally.
May I ask what factors caused this phenomenon to occur?

Thanks & Best Regards
bao

  • 0
    TI__Mastermind 23815 points

    Hi Bao,

    Can you please answer the following for my better understanding of the situation. 

    • Do you have any waveforms?
    • Are the devices getting permanent damage or they are just not restarting? 
    • Can you try this with some dvdt cap?

    Best Regards,
    Arush

  • 0 in reply to Arush Gupta
    Prodigy 20 points

    Hi Arush，

    Thank you for your prompt reply. I apologize for the late response.

    1.Do you have any waveforms?
    ->please confirm the other excel sheet starting with 「波形確認シート」. We have provided the waveform when it is normally operating vs when it is defective.

    2.Are the devices getting permanent damege or they are just not restarting?
    ->The device does nto get permament damage, they are just not restarting. Sometimes when we close the power onto the Efuse PCB and repower it, it starts back up normally sometimes.

    3.Can you try this with some dvdt cap?
    ->At first we tried with a dvdt cap of 3300pF, however, the product cannot be restarted (even after trying to restart the product many times). In the end, we decided not to use a dvdt cap.

    If there are any advises or proposals with regards to the dvdt cap, please let us know. we can try it out.

    Thanks & Best Regards
    bao

  • 0 in reply to ZB xu
    TI__Mastermind 23815 points

    Hi Bao,

    I got stuck in lab for last week and wasn't able to get back to you. I apologies for that.

    From the waveform, it looks like the device is doing retry with 50ms. The issue is it is not ramping back up to high level. 

    Do you have C3 and C14 on the board? What is the ambient temperature at which this waveforms were captured. This looks like TSD is hitting and output cap is loosing its charge hence not even hiccup mode startup is happening. 

    Using dvdt cap will slow the startup which should help against higher inrush current. 

    How are these normal operation waveforms captured? Is changing the IC removing the issue. 

    Best Regards,
    Arush

  • 0 in reply to Arush Gupta
    Prodigy 20 points

    Hi Arush，
    Answer for your questions are as follows.

    1.Do you have C3 and C14 on the board?
    ->C3 and C14 220uF are SMT on board.

    2.What is the ambient temperature at which this waveforms were captured.
    ->When the waveform was captured, the surround temperature is around 25C

    3.How are these normal operation waveforms captured?
    ->Under the same environment, the waveforms were captured during normal operation and abnormal operations

    4.Is changing the IC removing the issue.
    ->Even if we change the PCB, the abnormal operation still comes up. Changing the IC does not remove the issue。

    Thanks & Best Regards
    Bao

  • 0 in reply to ZB xu
    TI__Mastermind 23815 points

    Hi Bao,

    Any update from your side on this? 

    From my side, I can only think that higher dvdt cap should help here by slowing down the startup, chances of TSD happening will reduce.

    Also, I feel that the debug pace is very slow from my end so I think it will be better to shift to mail for further communication.

    Can you accept my friend request. I will share my email id over E2E DM feature.

    Best regards,
    Arush