SLUSDW9A June 2020 – June 2020 TPS51215A
TPS51215A uses a low-side on-resistance (RDS(on) ) sensing scheme. The TRIP pin sources 10 µA of current and the trip level is set to 1/8 of the voltage across the TRIP resistor (RTRIP ). The overcurrent trip level is determined by RTRIP × (ITRIP /8). Because the comparison is done during the off state, the trip voltage sets the valley current. The load current can be calculated by considering the inductor ripple current.