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LM5064: R_PWR resistor question

Part Number: LM5064

Tool/software:

Hi Sir,

there is a LM5064 datasheet question, the formula (2) on page_21 , as below:

but we calculate according to page_12 block diagram, 18*10^(-6)*RPWR=IDS*RS *VDS --> RPWR=0.55*10^5*RS(IDS *VDS)=0.55*10^5 * RS* PMOS(LIM). as below:

there seems to be a gap in the calculation result, is there error in our calculate above?

could help us check or any suggestion and learn from you, thanks.