AS3842 PDF datasheet can download.
This product has Current Mode Controller functions.
This is one of the semiconductor types. This part name is AS3842.
Manufacturers of the product is ETC.
Image and pinout :
Some of the text files within the PDF file
SEMICONDUCTOR AS384x Current Mode Controller
The AS3842 family of control ICs provide pin-for-pin replacement of the industry standard UC3842 series of devices. The devices are redesigned to provide significantly improved tolerances in power supply manufacturing. The 2.5 V reference has been trimmed to 1.0% tolerance. The oscillator discharge current is trimmed to provide guaranteed duty cycle clamping rather than specified discharge current. The circuit is more completely specified to guarantee all parameters impacting power supply manufacturing tolerances. In addition, the oscillator and flip-flop sections have been enhanced to provide additional performance. The RT/CT pin now doubles as a synchronization input that can be easily driven from open collector/open drain logic outputs. This sync input is a high impedance input and can easily be used for externally clocked systems. The new flip-flop topology allows the duty cycle on the AS3844/5 to be guaranteed between 49 an [ … ]
Please refer to the file for details.