8.4.2.3 Low V_SENSE Case 1: V_SENSE< 20 mV, –16 V ≤ V_CM< 0; and Low V_SENSE Case 3: V_SENSE< 20 mV,
V_S< V_CM ≤ 80 V

Although the INA270 family of devices are not designed for accurate operation in either of these regions, some applications are exposed to these conditions. For example, when monitoring power supplies that are switched on and off while V_S is still applied to the INA270 or INA271, knowing what the behavior of the devices is in these regions is important.

When V_SENSE approaches 0 mV, in these V_CM regions, the device output accuracy degrades. A larger-than-normal offset can appear at the current shunt monitor output with a typical maximum value of V_OUT = 60 mV for V_SENSE = 0 mV. When V_SENSE approaches 20 mV, V_OUT returns to the expected output value with accuracy as specified in the Electrical Characteristics. Figure 17 shows this effect using the INA271 (gain = 20).

Figure 17. Example For Low V_SENSE Cases 1 and 3 (INA271, Gain = 20)