1) How do I choose the resistor for a triac? I saw this design in the opto-isolator datasheet that I'm using. I thought I'll just change the resistor value based on the gate characteristics of my Triac. I referred a few other circuits that had similar resistor values, irrespective of the triac. I'm using a 3Q triac, Q6012LH5, which is a 600V, 12A,3Q triac.
Related question 1, Related question 2 In one of the questions, a member specified that the value of the resistor is based on the Absolute max of the optocoupler. I still didn't understand, why max gate current is not taken into account.
2) In the triac datasheet, it is mentioned that max gate current Igt = 50mA. And Igtm(Abs Max Rating) = 2A(10us). Do they mean that 50mA is the max current that is required to trigger the triac in all conditions?
3) I understand that holding current Ih is the minimum current that a triac needs to keep itself On, after the gate pulse is removed. Right? Then why do they specify Ih = 50mA when It = 100mA. Is doesn't make sense to me! Am I missing something here?