I want to build myself an adjustable bench power supply with adjustable current limiting, mainly for fun but also because I want something to help me with prototyping. I have previously built small voltage supplies using linear regulators and pots, but I want something with the current control also.
I found the L200 and it seems to do what I want it to do:
Voltage between 0-24V
Current limiting 10m-2A (these are approx)
Here's an example circuit from the L200 datasheet:
My questions are as follows:
Is this a decent solution for such a device in the modern day? Are there better IC solutions than this one? Maybe one that uses less external components?
Is there an easy way to control the voltage/current with an MCU? Will I have to use digital pots to replace the analogue ones, or something, to do this?
When I want to set/measure the output current limit, do I simply short Vo to ground through an ammeter and adjust P1? (I am under the impression this is how you do it with retail PSUs, not sure if this works in the same way).
What kind of wattage resistors should I use? My naive calculation tells me that if the max current possible is 1.5A, then the max power dissipation in R3 is 1.5^2 * 0.1 = 0.225W, so most garden variety resistors would be OK. Is this correct?
Thanks for any help!