The PKB4111C from Flex Power Modules is a DC to DC Converter with Input Voltage 36 to 75 V, Output Voltage 1 4 to 5.5 V, Output Current 1 28 A, Output Power 140000 mW, Isolation Voltage 750 to 1500 Vdc. Tags: Through Hole, Surface Mount, Buck/Step down. More details for PKB4111C can be seen below.