CRD-30DD12N-K Reference Design : DC input voltage measurement circuit

gkim

Hello,

With respect to the reference design of CRD-30DD12N-K, I have a question on the DC input voltage measurement circuit shown in Sheet 2 of 4 of the CONTROL_BOARD.pdf file.

It is uploaded as below:

Now the signals of both DC_FB and DC-0V are originated from DCINPUT; therefore they are actually the same voltage signal.

Moreover, in the uploaded image, two voltage signals of _AD_DCinput and _AD_DCinput _0V might be almost the same level.

I wonder why the the DC input voltage is measured twice with regard to _AD_DCinput and _AD_DCinput _0V.

Thank you for your consideration.

With regards,

GKIM