sorry my friend i cannot find the AS3842 datasheet on google.
i can find references to it, but i cant find it.
There are many datasheet sites which appear to offet it, but send you on a merry-go-round "click-stream" that just goes round in circles and doesn't lead to the datasheet.
I know its made by Astec semiconductor, but their website is not possible to find on google.
Anyway, the UC3842 is about the cheapest PWM IC in the world , and is made by many many companies , so yes, it may well be exactly the same.
By the way , has any reader ever , ever managed to find a datasheet from sites like..............
"http://www.datasheetarchive.com"
"http://www.alldatasheet.com"
"http://www.datasheetsite.com"
.....i have never been sucessful with these...do i have to pay a fee to them or something?