op amp as a comparator
Tha main reasons of the OpAmp as comparator usage are:
1. Most of more or less fast comarators have large bias current
2. Sometimes simmetrical hysteresis is needed, using positive feedback
3. Sometimes large input voltage rating and output swing is necessary
etc.
In one schematic, for example, I have used a LM6161 (though its bias current is not small) as comparator, because its large input voltage rating, and because the same part is used in the analog front end of the same design, just to reduce the BOM.
That is why I am asking for real experience or exact recommendations, not a general thoughts.
Varuzhan