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TPS61175-Q1 - the variability of the switching-frequency

Dice-K
Mastermind 7470 points
Other Parts Discussed in Thread: TPS61175-Q1, TPS61175

Hello,
I have a question about TPS61175-Q1.

Please tell me each switching-frequency following three condition of Rfreq.

①Rfreq = 255kΩ
②Rfreq = 256.275kΩ
③Rfreq = 253.725kΩ

I cannot decide the switching-frequency by Figure-7 of SLVSCN9
My customer wants to know the variability of the switching-frequency by the variability of resistance-value.

Regards,
Daisuke

  • 0
    TI__Mastermind 40080 points

    Hi Daisuke,

    We have no equation on how to calculate the switching frequency of TPS61175. Please refer to the “Switching Frequency vs External Resistor” graph in the datasheet. This graph is an experimental result.
    The 0.5% resistor tolerance will lead to 0.5% average frequency difference.The main frequency tolerance is caused by the IC's lot by lot tolerance. Please refer to the datasheet on page 5. For the same resistor, there's aound +-20% frequency tolerance.

    BR,Helen