This part is a kind of semiconductor called FSP150-50LH.

Function of this product has 150 Watts Flex ATX Switching Power Supply.

Manufacturers : Sparkle Power

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Some of the text within the PDF file :

Sparkle Power Inc. A Leading Power Supply Manufacturer Web site: www.sparklepower.com FSP150-50LH Features     (80PLUS Silver, RoHS Compliant) 150 Watts Flex ATX Switching Power Supply Specification  Complied with Flex ATX standard Active Power Factor Correction (PFC) meet EN61000-3-2 High efficiency and reliability Compatible with European Union Directive 2002/95/EC (Restriction on Hazardous Substances). Temperature Range: Operating: 0°C ~ +50°C on full load; storage & shipping: -20°C ~ +80°C Humidity: 85% on operating, 95% on storage Dielectric Withstand: Primary frame ground 1800V AC for 2 second Efficiency: Typical > 88% Rise time: Less than 20ms Hold-up Time: 16 ms minimum at nominal input voltage Power Good Signal: Power on delay time 100 ~ 500ms, off delay 1m [ ... ]

FSP150-50LH PDF Datasheet Download