I have a micro-controller which calculates and decides about the current each minute. Then for one minute the circuit must hold that current constant. Then it should control the current via a buck circuit including MOSFET and a hall-effect current sensor. How to do it with AVR? it seems I need a control design(control theory). If there is an IC doing that automatically, it is very appreciated (I mean that I give it the required current in analogue or digital and it generates appropriate PWM).
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