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

Although the INA203 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 INA203, INA204, or INA205. Take care to know what the behavior of the devices will be in these regions.

As 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 = 300 mV for V_SENSE = 0 mV. As V_SENSE approaches 20 mV, V_OUT returns to the expected output value with accuracy as specified in the Section 6.5. Figure 7-11 illustrates this effect using the INA205 (Gain = 100).

Figure 7-11 Example for Low V_SENSE Cases 1 and 3 (INA205, Gain = 100)