Other Parts Discussed in Thread: OPA2376, AMC1200
Hi,
I went for the TIDA-00445 after these specs caught my eyes:
So I thought it would provide some sort of shunt based AC mains measurement.
But after reading the document, I found the authors did not address the input common mode - unless I missed something. From the block diagram, we can see the OPA2376 is directly connected to the shunt over an AC line:
The authors discuss the differential voltage, but not the common mode (CM) voltage. The OPA2376 cannot withstand the proposed 1200V CM.
Figure 4.a shows CM was not accounted for:
On the test setup:
"The DC input voltage was supplied by a Keithley 2450 source meter. Accuracy of the design was
calculated for every 1 mV in the input voltage over a range of –15 to 25 mV.
A similar test was conducted with AC input voltage and current wherein the design was tested for input
ranging from 1 to 17 mVRMS with 1-mV steps."
So it is my understanding that this design was not tested with a real AC line, CM up to 1200V. Am I correct?
If so, this design would have some very bad results if implemented and used as described.