This part is a kind of semiconductor called IW1688.
Function of this product has Low Power Off Line Digital PWM Controller.
Manufacturers : iWatt
Image and pinout :
Some of the text within the PDF file :
www.DataSheet4U.com iW1688 Low-Power Off-line Digital PWM Controller 1.0 Features • • • • • • • • • • • Primary-side feedback eliminates opto-isolators and simpliﬁes design Multi-mode operation for highest overall efﬁciency ±4% typical output voltage regulation No external compensation components required Complies with CEC/EPA no load power consumption and average efﬁciency regulations Built-in output constant-current control with foldback Low start-up current (8 µA typical) Built-in soft start Built-in short circuit protection AC line under/overvoltage and output overvoltage protection Fixed 40 kHz switching frequency 2.0 Description The iW1688 is a high performance power supply controller which uses digital control technology to build sensorless peak curre [ ... ]