Hi,
I have simulated this circuit using LTSpice and it appears to work fine:
However, the datasheet (https://www.mouser.com/ds/2/239/MOC302-1175440.pdf) shows the following circuit:
I've attempted a simulation to try to understand it (attached). The simulation sort of works (works better with the load on the -ve rail). But the resistor and capacitor values I've chosen are taken out of very thin air! The fact is that I don't understand the circuit, but assume that the additional components (compared to my circuit) are there for a reason.
Some of the load is carried by the MOC3020, but this seems a bit redundant as its maximum power dissipation rating is only 300mW, which isn't much help to the power triac.
I'm particularly interested in the capacitor as I suspect that it is there to stop false firing on the triac???
Help appreciated!
Robert
I have simulated this circuit using LTSpice and it appears to work fine:
However, the datasheet (https://www.mouser.com/ds/2/239/MOC302-1175440.pdf) shows the following circuit:
I've attempted a simulation to try to understand it (attached). The simulation sort of works (works better with the load on the -ve rail). But the resistor and capacitor values I've chosen are taken out of very thin air! The fact is that I don't understand the circuit, but assume that the additional components (compared to my circuit) are there for a reason.
Some of the load is carried by the MOC3020, but this seems a bit redundant as its maximum power dissipation rating is only 300mW, which isn't much help to the power triac.
I'm particularly interested in the capacitor as I suspect that it is there to stop false firing on the triac???
Help appreciated!
Robert
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