The A pin serves as the simulated diode anode and the C as the cathode. GATE is driven high when V(AC) exceeds 10 mV. Both devices provide a strong GATE pull-down when V(AC) is less than the programmable fast turn-off threshold. The TPS2410 has a soft pull-down when V(AC) is less than 10 mV but above the fast turn-off threshold.
Several internal comparator and amplifier circuits monitor these two pins. The inputs are protected from excess differential voltage by a clamp diode and series resistance. If C falls below A by more than about 0.7 V, a small current flows out of A. Protect the internal circuits with an external clamp if C can be more than 6 V lower than A. A small signal clamp diode and 1-kΩ resistor, or circuit per Figure 13 are suitable.
The internal charge pump output, which provides bias power to the comparators and voltage to drive GATE, is referenced to A. Some charge pump current appears on A due to this topology. The A and C pins should be Kelvin connected to the MOSFET source and drain. A and C connections should also be short and low impedance, with special attention to the A connection. Residual noise from the charge pump can be reduced with a bypass capacitor at A if the application permits.