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TPS7H1111-SEP: TPS7H1111-SEP's R_ref

Takeshi Tachibana
Prodigy 30 points

Part Number: TPS7H1111-SEP

Would it be acceptable to set R_ref of TPS7H1111-SEP to 12.1kOhm?

The datasheet specifies 12.0 kOhm however, for internal reasons on our side, it would be preferable if 12.1 kOhm could be used. Would this be acceptable?

  • 0
    TI__Intellectual 2155 points

    Hi Takeshi,

    Using a 12.1kOhm wouldn't cause any damage to the part but it would affect the accuracy of the part features. Section 8.3.2 provides the information on how the R_Ref pin and resistor affects the part. Below is part of the description from the section about R_REF:

    If high and precise accuracy for the part is not a high priority, using 12.1k instead of 12.0k Ohms will be okay as it's the same as using a 12k with about a 1% tolerance.

    Thanks,
    Elizabeth

  • 0 in reply to Elizabeth Won
    Prodigy 30 points

    Thank you for your reply.

    What is "accuracy"? 

    Does that mean the output voltage might differ from the design value?

    Or will the ripple increase?

  • 0 in reply to Takeshi Tachibana
    TI__Intellectual 2155 points

    Hi Takeshi,

    The output voltage might differ a little, but depending on your needs, the voltage output may still be within tolerance. R_REF sets the current output on the SS_SET pin which is used to set the output voltage. Changing R_REF from 12k to 12.1k Ohms will cause the reference current on SS_SET to not be 100uA. 

    Let me know if you have any more questions.
    Thanks,
    Elizabeth