I need to come up with a 24v in - 15v out 1 amp or less switching regulator for a project I'm working on. 10k+ units needed so cost is important, looking for min of external parts needed as well. We want to build this module our selves and not use a china made unit. Done that, that is why we are looking to build our own.
I know there are LOTs to choose from, but just looking to narrow the search down, so what have you used successfully in the past.