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Data sheet for bg24600 datasheet (SLUS891) - K factor isn't 5

Andy10159
Intellectual 620 points

Here is a repeating failure in the data sheet. There is application information in the specifications chart.

On page 4 you'll find something called KISET. According to the data sheet, it is 5 A/V.  I believe it is actually 1/(20 x Rsense). It is only 5 when Rsense is 10mOhm.

Andy

  • 0
    TI__Mastermind 32370 points

    Hi Andy,

     

    I think that is obvious from the table. Under the TEST CONDITIONS RSENSE=10mΩ. Moreover, it is not needed according to equation 2, 3 and 4 since VISET is provided.  

     

    Thanks,

    Tahar

  • 0 in reply to Tahar Allag
    Intellectual 620 points

    Thank you Tahar,

    My point is that a part specification table should not include specifications of external components unless they are required for operation of the component. In this case, the sense resistor can be changed at my discretion. The gain of 20 between the sense inputs IS a specification. It is part of the chip and can't be changed by the application. When writing my model for this part I included the gain of 20 AND the K of 5 as I went through the specification table. That led to problems as I moved through the rest of the document. There just isn't a good reason to have application data in the specification table.

    "Obvious" statements lead to arbitrary understandings.

    Andy

  • 0 in reply to Andy10159
    TI__Mastermind 32370 points

    Hi Andy,

     

    Yes, that is right. The 20 factor is part of the IC and is the spec. Rsense is an external component and can be changed. The table is the electrical characteristics for the part and the values are provided under certain test conditions.

     

     

    Thanks,

    Tahar