The PAF500F24-28 from TDK Corporation is a DC to DC Converter with Input Voltage 18 to 36 V, Output Voltage 1 28 V, Output Current 1 18000 mA, Output Power 504000 mW, Operating Temperature -40 to 100 Degree C. Tags: Through Hole, Buck-Boost. More details for PAF500F24-28 can be seen below.