Hello every one!
In my design, I am using a AD8223 as a current sense amplifier on a +5V 10A power supply.
Here is the AD8223 wiring:
-Vs = GND (0V)
+Vs = +15V
REF = GND
RG = 1.23kohm
IN+ and IN- are connected to the sense resistor, which is in series with the +5V output rail.
The sense resistor is 0.005ohm.
The power supply I am sensing runs in constant-current mode and can be set form 0A to 10A. Its output voltage can vary from 0V to 5V depending on settings and load.
If I correctly understand the datasheet, this configuration is possible. However, the voltage gain of the AD8223 is not 70 as expected but 80 according to my measurements.
I checked the resistors values and the power supplies and everything seems OK.
Do you know where the problem comes from?