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TPS54335-2A: How to determine switching frequency

Part Number: TPS54335-2A
Other Parts Discussed in Thread: TPS54335A

Dear Specialists,

My customer is considering TPS54335-2A and has a question.

I'd like to get advice for him.

---question

According to the datasheet, TPS54335-2A is able to set a switching frequency by RT at the feature P.1.

But I can't find the equation anywhere.

Could you please advise?

At the datasheet, an example, it is illustrated 140.6kohm at 340kHz.

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I appreciate your great help.

Best regards,

Shinichi