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LMZ31503: RRT: RT/CLK resistance calculation and accuracy

Satoshi
Guru 19595 points
Part Number: LMZ31503
Other Parts Discussed in Thread: LMZ31506,

I have question about RRT: switching frequency setting resister for LMZ31503 and LMZ31506, please see below.

①The below thread is described RRT accuracy is ±20%, but high fsw condition collision the high RRT and low RRT.

　(For example, 730kHz: 118kΩ ±20% and 780kHz: 105kΩ ±20%)

　I guess that fsw setting have certain equation and relation for RRT and fsw, correct?

https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/372261/lmz31710-and-lmz31503-switching-frequency

②Please let me know about calculation formula for determining the resistance value of the RT / CLK. (LMZ31503 and LMZ31506)

　Or, would you send direct e-mail the same way to below thread?

https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/329191/tps84620-rt-clk-resistance-calculation-formula/1147005

Best regards,

Satoshi