This part is a kind of semiconductor called FL7733AMX.

Function of this product has Primary-Side-Regulated LED Driver.

Manufacturers : Fairchild Semiconductor

Image and pinout :

Some of the text within the PDF file :

FL7733A Primary-Side-Regulated LED Driver with Power Factor Correction December 2014 FL7733A Primary-Side-Regulated LED Driver with Power Factor Correction Features Performance  < ±3% Total Constant Current Tolerance Over All Conditions < ±1% Over Universal Line Voltage Variation < ±1% from 50% to 100% Load Voltage Variation < ±1% with ±20% Magnetizing Inductance Variation  Primary-Side Regulation (PSR) Control for Cost- Effective Solution without Requiring Input Bulk Capacitor and Secondary Feedback Circuitry  Application Input Voltage Range: 80 VAC - 308 VAC  High PF of >0.9, and Low THD of < 10% Over Universal Line Input Range  Fast < 200 ms Start-up (at 85 VAC) using Internal High-Voltage Startup with VDD Regulation  Adaptive Feedback Loop Control for Star [ ... ]

FL7733AMX PDF Datasheet Download