This part is a kind of semiconductor called AIC3842CS.

Function of this product has Current-Mode PWM Controller.

Manufacturers : Analog Intergrations Corporation

Image and pinout :

Some of the text within the PDF file :

PRELIMINARY AIC3842 Current-Mode PWM Controller n FEATURES l Low Start-Up Current (300 µA Typical) l Internal Precision Reference. l 500KHz Current-Mode Operation. l Pulse-by-Pulse Current Limiting. l Automatic Feed-Forward Compensation. l Optimized for Off-Line and DC/DC Converters. l Undervoltage Lockout with Hysteresis. l Double Pulse Suppression. l High Current Totem-Pole Output. n DESCRIPTION The AIC3842 control IC provides the features that are necessary to implement off-line or DC/DC Converter fixed-frequency current-mode schemes with a minimum number of external components. This integrated circuits features an undervoltage lockout (UVLO) with approximately 300 µA start-up current, a precision reference trimmed for accuracy at the error amplifier input, high gain error amplifie [ ... ]

AIC3842CS PDF Datasheet Download