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TPS25927: Overload Current Limit MIN and MAX value

user4773196
Prodigy 705 points
Part Number: TPS25927

Hi Team,

On TPS25927x data sheet page 5, it indicates the MIN and MAX value of Overload Current Limit.

I would like to learn from you how we got the value of Overload Current Limit MIN and MAX value?

Thank you.

  • 0
    TI__Guru 57737 points

    Hi Tiffany Liu,

    The major factor which contributes to the Variation of Overload Current limit is the 'Offset of the Internal Amplifier' as highlighted in the block diagram below. That is the reason why the variation % increases at lower current limits.

    Generally, we test a certain number of samples from different lots , across temperature and see the variation of the parameter. Then we add some guard band and define Min and Max values. in Production, all the IC's are tested for that parameter and any IC which has that parameter out of Min, Max values are rejected. 

  • 0 in reply to Praveen GD
    TI__Guru 57737 points
    Hi Tiffany Liu,

    Do you have any more questions ? If not, can we close this thread ?
  • 0 in reply to Praveen GD
    TI__Prodigy 705 points

    Hi Praveen,

    May we learn from you how to calculate the error of Overload Current Limit?

    Or no calculation but just based on data sheet Figure 20?

    Please advise. Thank you.

    Tiffany 

  • 0 in reply to user4773196
    TI__Guru 57737 points
    Hi Tiffany,

    As mentioned earlier, the major cause of error is 'Offset voltage' of the internal amplifier and it varies with Process, Voltage and Temperature.
    It will be difficult to calculate the error based on so many variables.
    The best way would be to consider the Accuracy % data in Figure 20, as you mentioned.