Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.
Do you need current source instead? AL9910 from Diodes Incorporated is the simplest I found so far. Again, unfortunately it's non-isolated topology. Just google the datasheet, it gives you complete circuit for typical application. Cheap as!