LMZ31503: RRT: RT/CLK resistance calculation and accuracy

Satoshi

Guru 19525 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?

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?

Best regards,

Satoshi

0 Nancy Zhang over 2 years ago

Hi Satoshi,

I am checking with the team and will get you back next week. Thanks for your patience!

Thanks,

Nancy

+1 Nancy Zhang over 2 years ago in reply to Nancy Zhang

Hi Satoshi,

Please see attached slide for switching frequency calculation equation.

Thanks,

0 Satoshi over 2 years ago in reply to Nancy Zhang

Guru 19525 points

Hi Nancy,

Thank you for your kind support.

I understood RT/CLK setting.

Best regards,

Satoshi

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