The PKB4211D 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 40 A, Output Power 200000 mW, Isolation Voltage 750 to 2250 Vdc. Tags: Through Hole, Surface Mount, Buck/Step down. More details for PKB4211D can be seen below.