Triac datasheet values

I have a Triac that I want to use to control low voltage (~16 V) AC. The data sheet is found here. It specifies that the peak gate voltage is 5 V with a peak current rating of 2 A (which seems quite high to me). The datasheet also lists out the Gate trigger voltage as 0.7 V (typical).

I'll be using this opto-isolator to drive the triac gate, which doesn't seem to have much play in my question (but I could be wrong).

UPDATE: After some additional research it turns out that I was wrong here. The opto-isolator's max current is the determining factor for the gate resistor value. The iosolator used here has a max detector current of 1A. 16VAC has a RMS voltage value of 22.62VAC which leads to a minimum resistor value of 22.6 / 1 = ~22 ohms.

My question is which of these values should I consider when choosing a resistor to place before the triac's gate/opto isolator? I understand how a Triac and it's associated driver works but I just need a little assistance with reading the datasheet and which of the values I should be considering.

Also, are there any good resources for learning how to read datasheets or is this something that just comes with experience?

• I am sorry, but I can't see how you plan to use a triac and, basically, PWM driving, without having a proper idea about the circuit you want to use, the devices themselves or simply reading a datasheet. Maybe it's best to either call a friend or wait until you are certain about these things. I am sorry if this sounds harsh, but there is a reason for it.
I think you have to design in term of current, that must be >= to the Gate Trigger current in order to have the device ON. You can use the Gate trigger voltage as a voltage drop when you measure the current flowing in the gate in order to switch the TRIAC.