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

TBhatia

Hello GKIM,

_AD_DCinput is used for DC input voltage sampling. _AD_DCinput _0V is reserved for DC input OVP(over voltage protection), but this signal is not yet implemented in the software.

Usually the OVP signal is faster than the Analog sampling signal, so two channels with different RC parameters are set. Thank you.