SBOSA74 May 2022 INA190-EP
PRODUCTION DATA
The maximum value of the current-sense resistor is calculated based choice of gain, value of the maximum current the be sensed (IMAX), and the power supply voltage(VS). When operating at the maximum current, the output voltage must not exceed the positive output swing specification, VSP. For the given design parameters, Equation 6 determines that the maximum value for RSENSE is 1.321 kΩ.
However, because this value exceeds the maximum recommended value for RSENSE, a resistance value of 1 kΩ must be used. When operating at the minimum current value, IMIN the output voltage must be greater than the swing to GND (VSN), specification. For this example, Equation 7 determines that the output voltage at the minimum current is 25 mV, which is greater than the value for VSN.