This part is a kind of semiconductor called SG6742HR.
Function of this product has Highly Integrated Green-Mode PWM Controller.
Manufacturers : Fairchild Semiconductor
Image and pinout :
Some of the text within the PDF file :
SG6742HL/HR Highly Integrated Green-Mode PWM Controller April 2009 SG6742HL/HR Highly Integrated Green-Mode PWM Controller Features High-Voltage Startup Low Operating Current: 2.7mA Linearly Decreasing PWM Frequency to 22KHz Frequency Hopping to Reduce EMI Emission Fixed PWM Frequency: 100KHz Peak-Current-Mode Control Cycle-by-Cycle Current Limiting Leading-Edge Blanking (LEB) Synchronized Slope Compensation Internal Open-Loop Protection GATE Output Maximum Voltage Clamp: 18V VDD Under-Voltage Lockout (UVLO) VDD Over-Voltage Protection (OVP) Programmable Over-Temperature Protection (OTP) Internal Latch Circuit (OVP, OTP) Internal-Sense, Short-Circuit Protection Built-in 6ms Soft-Start Function Constant Power Limit (Full AC Inpu [ ... ]
SG6742HR PDF Datasheet Download
