Hi, I am looking for a way to get DC-DC step up from 3v to 400v, only needing to deliver 5mA max at 400v, I have looked for a while now and have found some bulky modules, however I cannot find a way to do this in a compact mannor for a reasonable price (under $15), It needs to be able to be turned on and off at a logic level (which I know how to do externally, it would be nice to find a chip which could do this with it built in). The only modules I have found that can do this are for over $40 which seems way too much for what it is. My question is, are there any modules or chips I should know about that would help me? Thanks