well the PIC will be more flexible and requires less components, this is for my vintage car regulator project, if I am to build a number of them I can easily alter current limitation values by altering the program, with a comparator I will need to ajust small trimmers and have the trimmers in the first place, basically just how durable is a pic ?
Hi,
Not necessarily true, as you can put an external comparator in the
loop just as well as the internal comparator simply by sampling the
output of the comparator, or use it to trigger an on change pin event.
Thus, the external can be used very close to how the internal works,
which means programming can change features.
There is a catch of course, and that it requires more pins, and
possibly an extra pin for a simple D to A converter (PWM) to adjust
the comparator threshold. The internal comparator adjustment isnt
that good anyway, with the available voltage levels being very limited
to very unusual step increments.
What i dont know is just how much the internal comparator offset
voltage drifts with temperature, while with the external one you can
select just about anything out there.
In any case, with a design like this usually some rigorous real world
testing is in order...build a small test oven to test the final design.