This part is a kind of semiconductor called ASAP2805S.

Function of this product has HIGH RELIABILITY HYBRID DC-DC CONVERTERS.

Manufacturers : IRF

Image and pinout :

Some of the text within the PDF file :

PD-97731 ASAP SERIES HIGH RELIABILITY HYBRID DC-DC CONVERTERS Description The ASAP Series of DC-DC converters are high reliability thick film hybrid converters that use flyback topology operating at a nominal frequency of 550KHz. High input to output isolation is achieved through the use of transformers in the flyback power and feedback circuits. The advanced feedback design provides fast loop response for superior line and load transient characteristics and offers greater reliability than devices incorporating optical feedback circuits. This device is designed to meet MIL-STD-704D input requirements offering full performance over a wide 15 to 50 volt input range and output power of up to 6.0 watts. Connecting the inhibit pin (pin 5) to the input common (pin 7) will cause the converter to [ ... ]

ASAP2805S PDF Datasheet Download