This design example considers a 12 V system operating voltage with a tolerance of ±10%. The maximum steady-state load current is 333 A. If the load current exceeds 367 A, the eFuse circuit must allow transient overload currents up to a 10 ms interval. For persistent overloads lasting longer than that, the eFuse circuit must break the circuit and then latch-off. The eFuse circuit must charge a bulk capacitance of 50 mF and support approximately 7.5% of the steady-state load during start-up. Figure 9-4 shows the application schematic for this design example.

Figure 9-4 Application Schematic for a 12-V, 4-kW Power Path Protection Circuit with PMBus^® Interface