Unable to find any info about the SMPS IC
I am reverse engineering a SMPS AC DC converter


Why do this when there are several (plenty) of designs out there with full designs and specifications for all the wound components and sometimes PCB layouts too. I'm thinking here of a company called Power Integrations - they make a very wide range of SMPS power supplies and another company called Premier Magnetics design (and supply) many, many wound components for the PI chips. PM also supply wound components for TI chips. See this page.

So, if I just take one example using the PM route I get a list of over 100 UL-CSA recognized designs ranging from low voltage to high voltage and low power to high power. Each one links to a specific design and importantly gives you a schematic and a supply reference for the transformer.

You can also use PI's site to design your own transformer.

So why bother reverse engineering something you have because, that power supply you are reverse engineering: -


May not have a universal supply voltage input range
May not have proper/adequate EMC
May have clearance/isolation that is not be good enough for new designs
May have other ambiguous components that you mistakenly identify
May not be very good in ways you have not considered.