The accuracy of the INA203, INA204, and INA205 current shunt monitors is a function of two main variables: V_SENSE (V_IN+ – V_IN–) and common-mode voltage, V_CM, relative to the supply voltage, V_S. V_CM is expressed as (V_IN+ + V_IN–) / 2; however, in practice, V_CM is seen as the voltage at V_IN+ because the voltage drop across V_SENSE is usually small.

This section addresses the accuracy of these specific operating regions:

• Normal Case 1: V_SENSE ≥ 20 mV, V_CM ≥ V_S
• Normal Case 2: V_SENSE ≥ 20 mV, V_CM < V_S
• Low V_SENSE Case 1: V_SENSE < 20 mV, –16 V ≤ V_CM < 0
• Low V_SENSE Case 2: V_SENSE < 20 mV, 0 V ≤ V_CM ≤ V_S
• Low V_SENSE Case 3: V_SENSE < 20 mV, V_S < V_CM ≤ 80 V