CURRENT WALK-IN CIRCUIT
HSP power supplies incorporate a specialized output regulator start-up circuit for applications involving use of the HSP as a battery charger. This circuit, enabled via switch S1-2, overrides the normal duty-cycle-based soft-start circuit, which could still result in very fast output current rise rates into a discharged battery, and substitutes a controlled-current rise circuit with a time constant in accordance with Bellcore TR-TSY-000947 requirements for telecommunications battery rectifiers. The circuit is reset each time that the output regulator is shut down. This circuit is targeted for battery charger applications, but is ideal for any application which draws very large currents at power-up, such as high-capacitance loads, where this large current spike could result in circuit disruptions due to inductive coupling
