SBOSA30C March 2022 – October 2023 INA241A , INA241B
PRODUCTION DATA
For this application, the INA241x measures current in the drive circuitry of a 48 V, 4000 RPM motor.
To demonstrate the performance of the device, the INA241A2 with a gain of 20 V/V was selected for this design and powered from a 5 V supply.
Using the information in the Section 8.4.3.2 section, the reference point is set to mid-scale by splitting the supply with REF1 connected to supply and REF2 connected to ground. This configuration allows for bipolar current measurements. Alternatively, the reference pins can be tied together and driven with an external precision reference.
The current-sensing resistor is sized so that the output of the INA241x is not saturated. A value of 100 mΩ was selected to maintain the analog input within the device limits.