This part is a kind of semiconductor called OB3330.
Function of this product has 20W LED Driver Using Demo Board.
Manufacturers : On-Bright
Image and pinout :
Some of the text within the PDF file :
20W LED Driver Using OB3330 LED48V0.4A–OB3330.00 Subject OB3330 Demo Board Manual Board Model: LED48V0.4A-OB3330.00 Doc. No.: OB_DOC_DBM_A_333000 Key features: Primary-side control with single stage PFC for LED driver Minimum BOM component amount Power factor >0.9 THD meet IEC61000-3-2 Class C Short circuit protection Meet EN55015 & FCC Part 15 EMI Revision History Revise Date Version Reason/Issue 2011-12-27 00 First issue On-Bright Confidential to ©On-Bright Electronics Confidential OB_DOC_DBM_A_333000 1 20W LED Driver Using OB3330 LED48V0.4A–OB3330.00 Contents Index 1. Adapter Module Specification ..................................................................................................... 4 1.1. Input Characteristics .................... [ ... ]