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BQ76930: How to calculate the Rdrian in BQ76930 REGSRC circuit?

Part Number: BQ76930
Other Parts Discussed in Thread: TIDA-00449

Hi team,

I am writing to ask a question about how to calculate the Rdrian in BQ76930 REGSRC cirtui?

I noticed we have a detailed explanation of how the circuit works in BQ769X0 family Top 10 Considerations figure 14. If my understanding is correct, the voltage acorss Rdrian should be Vbat- VC5x-Vgsth. Then how we should determine the current limit value on this path?