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TPS548A20: How do you set the switching frequency for this part?

aarmutat
Intellectual 2941 points
Part Number: TPS548A20

To state this datasheet is poorly conceived is the kindest way I can put it.  Please post how to set the switching frequency for this part in this thread and then go fix the datasheet so it is clear.  What is Rrf<0.041, Rrf=0.096, etc?  I encourage you to use accepted electrical engineering terms and units in your answer and your rewrite.  Many thanks.

  • 0
    TI__Guru**** 191445 points
    Hi Andy,

    I do not directly support TPS548A20, but I can answer your question. Rrf is the divider ratio from VREG to RF = Rbottom / Rtop + Rbottom. For what ever reason, they do not explain it in the datasheet. There is a table with examples in the EVM users guide though in Section 6.1, Table 3:

    www.ti.com/.../sluubc0.pdf

    I will alert the appropriate team member about this after the holiday. If you need immediate further assistance, you can contact me directly. I am out of the office but am monitoring the forum and emails and can get back to you pretty quickly.