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TPS25924: About Minimum IOL Calculation

Tsukui Yusuke
Guru 21930 points
Part Number: TPS25924

Hi,

Customer wants to calculate the minimum IOL value according to the ILIM setting.
The following calculation formula is described in the data sheet.
However, the accuracy information for estimating the minimum value is not considered.


1.  Could you tell me the calculation method to estimate the minimum IOL?

2.  In the calculation formula, IOL = 3.7A when 100kΩ. However, the typical value of electrical characteristics is 3.75A.
     Which is the correct spec, 3.7A or 3.75A?
     And Please tell me the meaning of "Vvin-vout = 1V".



Best regards,
Yusuke

  • 0
    TI__Guru 57737 points

    Hi Yusuke,

    You can consider 3.75 A to be more accurate current limit value for, Rilm = 100 kohms. This is because the values in the Electrical Characteristics table are actual values measured on bench for devices across process, temperature  and voltage. The formula is derived theoretically and there can be very slight variation in theory vs practical. 

    Regarding accuracy you can use the graph provided in the datasheet below,

     

  • 0
    TI__Guru 57737 points

    Hi Yusuke,

    You can consider 3.75 A to be more accurate current limit value for, Rilm = 100 kohms. This is because the values in the Electrical Characteristics table are actual values measured on bench for devices across process, temperature  and voltage. The formula is derived theoretically and there can be very slight variation in theory vs practical. 

    Regarding accuracy you can use the graph provided in the datasheet below,