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Compiler/TPS259827LEVM: Efuse(TPS25982LNRGE) issue #2

YoungHan Song
Prodigy 80 points
Part Number: TPS259827LEVM

Tool/software: TI C/C++ Compiler

Hi,

I conducted an experiment on large load capacitance. *Consider the systems that apply...

I was already guessing that current limiting would happen.

As mentioned in datasheet, during startup the current limit is engaged without waiting for the ITMER Delay.

I interpreted this as "Thermal Shutdown" going to happen right away.

*So even if I changed the value of ITIMER capacitor, there would be no change in t_itimer

But I had a question about the results of the experiment.

As a result of the experiment, thermal shutdown delay time seem to be fixed. (In my case, about 2ms)

Even if I changed Load Capacitance(above current limiting condition capacitance) or ITIMER capacitor, the results were the same.

Is thermal shutdown delay time in the simulation file(TINA TI) considered or is this value fixed?

Or I wonder if the value is fixed in the simulation program for convenience, but not in the actual device.

In my opinion, OTP time seems to be fixed, so I asked you this question.

Please guide me to solve this issue. Thanks. 

Regards,

Song

  • 0
    TI__Guru 57737 points

    Hi Song,

    Thermal shutdown in actual system depends on below parameters.

    • Ambient Temperature
    • Power Loss in the IC (Depends on Vin-Vout, Iinrush, Iload)
    • RQJA of the IC in actual system (layout, cooling dependent) 

    Since it is difficult to model Thermal parameters in behavioral model we only provide a fixed value. So, the simulation result doesn't show you the true IC behavior. We suggest you to verify this on our EVM. 

  • 0 in reply to Praveen GD
    Prodigy 80 points

    Thank you for your answer.

    I'll have to run the rest of the tests with EVM.

    Regards,

    Song