This reference design requires accurate measurement of the panel and battery currents to calculate and track the maximum power point. The design supports panels of up to 80V, so a maximum common-mode voltage of at least 80V is required.

The TMCS1127 Hall-effect sensor is selected for this reference design due to excellent performance for common-mode noise and low sensitivity error. Equation 7 and Equation 8 are used to calculate the resolution of the current sensor and power dissipation of the sensor for the parameters given in Table 3-2, and an example follows. TMCS1127B2A is selected due to the capability of sensing up to ±31A.