I have a project that I'm planning to power off an existing DC source that could vary from 30 - 85VDC.
The project uses a 5V Pro-Mini.
Using my perf-board prototype, the largest draw I've seen is about 70mA. That includes everything - sensors, switches, Mosfet, Display, etc.
What I want to do:
Take the 30 - 85 VDC available and bring it down to a regulated 5VDC with at least 100mA capacity.
Have this supply:
Take up little physical space
I can't find any OTS parts or modules that can handle the input Voltage range that isn't also physically large, Pricey, & way overkill on current (explaining the large size and cost)
Best Idea left I haven't looked into yet ... 2-step regulation. Bring the higher input voltage down to something reasonable (20V?) with the small size/current/cost, then use another regulator to step down the rest.
- still haven't really seen a module that can handle the input range that meets the size/current/cost requirements either.
I'm trying to avoid having to use a step-down resistor method but may have to resort to it if nothing else comes up. (At least its low current, so not as wasteful as t could be.)
Any suggestions would be appreciated.