I'm working on developing a product that will need to run off mains power (without any external brick) and I'm trying to figure the ballpark amount I need to budget for including a AC mains to 3.3VDC power supply on the board.
The board is already going to be handling mains-voltage stuff as part of its functionality. It only needs to supply around 300 mA for my design (150mA for the MC, 20mA for a character LCD backlight, and then few misc optocouplers and stuff.)
Volume is probably going to be somewhere from 50-5000, and it doesn't need to be terribly efficient or anything.
What is a good ballpark price to use for budgeting this?
I'm mostly using this to sanity-check my target price point to make sure there will actually be a profit margin left after it's all manufactured.
Also, if there are any more general resources about how to budget out a device like this, I'd be glad for any links or other help.