52__LAB POWER SUPPLY 20V, 2A

О.К.

Немного подправил делитель тока в напряжение.

Well, you are not going to find a resistor of that value and high watage, that is why these adjustments must be made by software, although in this case could put a pot in parallel with the shunt, raising the shunt to 3 ohms for instance.

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Real adjustable power supply.
 According to your firmware.

https://disk.yandex.ru/d/exnmYiGGYqdsMA

This simple circuit works perfectly in reality, the problem is that in simulide the current regulation involved in a loop is not very well resolved yet. but now de Side developers are working hard to improbe it.