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WEBENCH® Tools/TPS53315: Rr and Cr value selection.

Part Number: TPS53315

Tool/software: WEBENCH® Design Tools

Hi,

In the we-bench tool there is Rr and Cr  connected across  L1 along with Cac connected to Vfb pin, what is the significance of these in the circuit?

And how the value for it selected/(calculated)?

Is there any formula to calculate those values?

Regards,

Karthik