I have a circuit that does not work as expected. It uses a MOC3023 phototriac to directly control a 12V AC pump.
Since the motor is very low power I assumed I wouldn't need an external triac. This may very well be my mistake, but I still want to use the situation to learn from my mistakes and directly understand the problem.
I have an AC LED module (with rectification) that I use to test. It can be controlled using my circuitry without problem. When I connect the pump instead though, once the phototriac is triggered it latches and won't turn off again.
I then replaced the MOC3023 with a MOC3043, wich is the same plus zero crossing detection, since I thought the inductive load may cause some issues there. With absolutely no luck, the result is the same.
My two questions are is the external triac absolutely mandatory and if so, why? The second one is why does the phototriac latch up when a inductive load is present?