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Compiler/TPS25982: Efuse(TPS25982LNRGE) issue

YoungHan Song
Prodigy 80 points
Part Number: TPS25982

Tool/software: TI C/C++ Compiler

Hi,

My solution stops 

I want to use e-fuse (TPS259827LNRGE) to complete my system, but I have a problem.

I'd like to adjust the Slew-rate, but if I raise it to over 10nF(Cdvdt) like the following, it didn't working.

But I couldn't find the cause of this problem in datasheet.

Please guide me to solve this issue. Thanks. 

  • 0
    TI__Guru 57737 points

    Hi YoungHan Song,

    Welcome to e2e!

    I would recommend you to start your design with TPS25982 Design Calculator. The design calculator will help you in suggesting the right Cdvdt for your design.

    You can share the updated design calculator with us for review as well. 

    For some reason, the images you have shared have not loaded properly. Can you try loading them using the attachment icon in PNG format. 

  • 0 in reply to Praveen GD
    Prodigy 80 points

    Hi,

    Thank you for your reply.

    I uploaded the file again as you requested. Please confirm. 

    Thanks. 

  • 0 in reply to YoungHan Song
    TI__Guru 57737 points

    Hi Young Han,

    Remove the 100mohms load and try starting the device. The efuse cannot startup into such a high load. 

    During startup, the internal FET will be in Saturation region as there is voltage difference between Vin and Vout and current flowing throw it. The power loss in the device generates heat and can trigger thermal shutdown of the IC.

    You can refer to section, ‘9.2.2.5.2 Case 2: Start-Up With Load: Output Capacitance COUT and Load Draw Current’ in datasheet.

    The maximum resistance that the device can support depends on parameters like

    • Max Input voltage
    • Total output capacitance
    • Max Ambient Temperature
    • RQJA of the IC on your board

    Our design calculator helps you in getting a rough idea on how much resistance is acceptable for the device to have a successful startup based on your system spec.

    You can find the design calculator here: https://www.ti.com/product/TPS25982#design-development##design-tools-simulation

  • 0 in reply to Praveen GD
    Prodigy 80 points

    I solved the problem based on your answers. Thank you.