On Fri, 2 Nov 2018 at 03:00, John Coppens wrote: > ... > Does anyone have an idea which IC this could be? It's marked 9938F > and S1C01X. No logo as far as I can detect. > > I looked at the circuit and decided that they had been extravagant with the pinout - you only need 3 leads for that functionality :-). An eg SOT23 or smaller may suffice. And then I found these: 3 leads (albeit 8 pin package) http://www.fsjingfeng.com/product/show_product.php?id=3D443 http://www.fsjingfeng.com/product/show_product.php?id=3D454 4 leads https://cn.made-in-china.com/tupian/didiwei0601-cvqJweuKCEVm.html 5 leads - fully isolated https://cn.made-in-china.com/tupian/fszjy8888-hXvmKWulXxkD.html external FET, current sense external https://cn.made-in-china.com/tupian/didiwei0601-pveEdCgwAmcR.html LEGION https://cn.made-in-china.com/photo/hengliuqudongxinpian-1.html \ _________________ "S9306/S9308 core flying non-isolated dual color temperature S4223 dual chip combination version of the periphery is simple and low cost, excellent quality" https://cn.made-in-china.com/tupian/didiwei0601-YBMmwigzJnhA.html Note links & prices at bottom of page! And on and on and ... R --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .