I cant find IC from code printed in ic
It does look like a SiFirst SF1530.  

http://www.chinesechip.com/chipFile/2015-07/SF1530-6119-0.pdf

update, some similar parts from other manufacturers:
On-bright ob2263, Winsemi WS2283, TI ucc28700-q1, MAxim MAX5021-MAX5022