I need an isolated 24V 3mA supply to activate some optocoupler that will be read by some microcontroller. Its power supply will be the microcontroller's 5V. My first instinct was to use a flyback transformer, but these guys seem too start out at 500mA, so they are way too bulky.
I then noticed parts listed as "coupled inductor" or "pulse transformer" seem to have values in the right ballpark. However, I am not sure if these parts are a good fit because the datasheets for inductive parts don't provide much info.
So, two questions:
Are the datasheets really bad or am I missing something? I want maximum input voltage, frequency response, LI² values, this sort of stuff. Can I figure out these somehow from the datasheets? How do the people who use these parts know these parameters are ok?
Is there any fundamental difference between parts listed as coupled inductors, pulse transformers and flyback transformers? How about audio transformers and signal transformers?