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LM5122-Q1 DCR sensing

Part Number: LM5122-Q1
Other Parts Discussed in Thread: LM5122

Hi

I have a simple question about DCR sensing section. (regarding equation (21) and (22))

  (21)

   (22)

How can you calculate the above equations? (How to calculate from (21) to (22)?)

I understand the Acs_dcr is the gain of current amplifier. However I would like to know the process of that calculation.(What is 12.5kohm and 1.25kohm?)

Regards,

Koji Hamamoto