The PKB4518NC from Flex Power Modules is a DC to DC Converter with Input Voltage 36 to 75 V, Output Voltage 1 0.8 to 1.1 V, Output Current 1 50 A, Output Power 50000 mW, Isolation Voltage 750 to 1500 Vdc. Tags: Through Hole, Surface Mount, Buck/Step down. More details for PKB4518NC can be seen below.