• Resolved

LMP8646: Inaccurate output voltage

Part Number: LMP8646

I wanted to use this IC as a current sensor so just for preliminary testing I used a sense resistor(Rsesne) of 0.5 ohms and gain resistance (Rg) of value 49.9K. The supply voltage given to the IC was 12V and the common mode voltage (Vcm) to the input terminals was 6V. I passed a current of 0.4 A. From this I calculated that the output voltage (Vout) would be 1.996 V however I was getting an output voltage of just 0.13 V.

I tried changing the currents to different values however I never got the expected value. The value that I got was always less than what I was expecting.