The PKU3511S from Flex Power Modules is a DC to DC Converter with Input Voltage 9 to 36 V, Output Voltage 1 4.5 to 5.5 V, Output Current 1 1 A, Output Power 50000 mW, Isolation Voltage 2250 Vdc. Tags: Through Hole, Buck/Step down. More details for PKU3511S can be seen below.