7.4.2.1 Normal Case 1: V_SENSE ≥ 20 mV, V_CM ≥ V_S

This region of operation provides the highest accuracy. Here, the input offset voltage is characterized and measured using a two-step method. First, the gain is determined by Equation 1.

Equation 1.

where

• V_OUT1 = Output voltage with V_SENSE = 100 mV and
• V_OUT2 = Output voltage with V_SENSE = 20 mV.

Then the offset voltage is measured at V_SENSE = 100 mV and referred to the input (RTI) of the current shunt monitor, as shown in Equation 2.

Equation 2.

In the Typical Characteristics section, the Output Error vs Common-Mode Voltage curve (Figure 6) shows the highest accuracy for the this region of operation. In this plot, V_S = 12 V; for V_CM ≥ 12 V, the output error is at its minimum. This case is also used to create the V_SENSE ≥ 20-mV output specifications in the Electrical Characteristics table.