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Original question:

TPS62136: SS/TR tracking offset

TPS62136: SS/TR tracking offset max value

Oba
Genius 17325 points
Part Number: TPS62136

Hello,

I need max value of ISS/TR Tracking Offset which is defined only TYP as 11mV like the below figure from the datasheet.

Is MAX value available?

Regards,
Oba

  • 0
    TI__Guru**** 150870 points
    Hi Oba,

    Let's debug your setup and understand your goal to see if we can address it a different way. Can you share your schematic and explain what you are trying to do? Why can't you turn off the device with the EN pin to bring the output to 0V?
  • 0 in reply to Chris Glaser
    TI__Genius 17325 points

    Hello Chris,

    Thanks for your reply. Now I’m testing with TI TPS62136 EVM.
    Due to power down sequence requirement of a device, TPS62136 output voltage have to go down to 0V within about 500usec.

    As far as I tested, using tracking pin can shut down very quickly, maybe within 300usec although some offset voltage remains..

    But when using EN pin, it took over 10msec. So I’m looking for a way to use tracking. Is there any way?

     

    Regards,

    Oba

  • 0 in reply to Oba
    TI__Guru**** 150870 points
    Thanks for explaining Oba. What is the load during this shutdown time? If you disable the IC, the load might bring Vout down faster.

    Do you have a waveform of EN, Vout, SS/TR, and SW as it ramps down?
  • 0 in reply to Chris Glaser
    TI__Genius 17325 points

    Hello,

     

    I put the waveform below. 1st one is using tracking case, 2nd one is using EN case.

    In both cases, the load is almost 0.

     

    CH1(Yellow):VOUT, CH2(RED): SS/TR, CH3(BLUE):SW

     

    CH1(Yellow):VOUT, CH2(RED): EN, CH3(BLUE):SW

     

    I have to assume the load current is almost 0 during the shutdown.

    Because the load IC is reseted during shutdown and also

    I don’t want to design depending on the load current to fix the shutdown time.

     

    Is there any way to solve this issue by this device level.

     

    Regards,

    Oba