This part is a kind of semiconductor called VIPER22A.

Function of this product has LOW POWER OFF LINE SMPS PRIMARY SWITCHER.

Manufacturers : STMicroelectronics

Image and pinout :

Some of the text within the PDF file :

® VIPer22ADIP VIPer22AS LOW POWER OFF LINE SMPS PRIMARY SWITCHER TYPICAL POWER CAPABILITY Mains type European (195 - 265 Vac) US / Wide range (85 - 265 Vac) SO-8 12 W 7W DIP-8 20 W 12 W SO-8 DIP-8 ORDER CODES n n n n FIXED 60 KHZ SWITCHING FREQUENCY 9V TO 38V WIDE RANGE VDD VOLTAGE CURRENT MODE CONTROL AUXILIARY UNDERVOLTAGE LOCKOUT WITH HYSTERESIS SOURCE PACKAGE SO-8 DIP-8 TUBE T&R VIPer22AS VIPer22AS13TR VIPer22ADIP - n HIGH VOLTAGE START UP CURRENT n OVERTEMPERATURE, OVERCURRENT AND OVERVOLTAGE PROTECTION WITH AUTORESTART DESCRIPTION The VIPer22A combines a dedicated current mode PWM controller with a high voltage Power BLOCK DIAGRAM MOSFET on the same silicon chip. Typical applications cover off line power supplies for battery charger adapters, standby power supplies for TV [ ... ]

VIPER22A PDF Datasheet Download