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Original question:

TPS23751: About TPS23751 PMP11254 schematic question

TPS23751: How to calculate Rff

Shinichi Inoue
Guru 21721 points
Part Number: TPS23751
Other Parts Discussed in Thread: PMP11254,

Dear Specialists,

My customer is considering TPS23751 and referring PMP11254.

They have a question about how to calculate Rff.

I'd be grateful if you could advise.

---

According to the thread listed below, it is recommended to use. 

However, it cannot be applied to PMP11254.
RSC does not exist in the connection diagram of PMP11254.

Could you please let us know how to calculate Rff.

ｰｰｰ

I appreciate your great help in advance.

Best regards,

Shinichi

  • 0
    Guru 21721 points

    Hi All,

    I forgot to explain.

    The formula and the figure are from SLUP261. 

    I'm looking forward to waiting your advise.

    Best regards,

    Shinichi

  • 0 in reply to Shinichi Inoue
    TI__Mastermind 21320 points

    Hello, 

    This resistor is internal to the IC. The value is not listed in the datasheet. 

    I will note, Rff is in PMP11254 as R36 --- is there a reason you cannot use this value?

    If this post answers your question, please indicate so by marking this thread as resolved. Thank you.

     

    Regards, 

     

    Michael P.

    Applications Engineer

    Texas Instruments 

  • 0 in reply to Michael Pahl
    Guru 21721 points

    Hi Michael,

    Thank you for your relpy.

    I understand Rsc is device inside.

    It is no problem to use the value of R36(750kohm).

    I'll share this value with the customer.

    If the customer has an additional question, I consult you again.

    I appreciate your great help.

    Best regards,

    Shinichi