Hello! I have an issue that i haven’t seen much detail on yet (bear with me if there’s loads of info on the subject).
I am designing a 230V 200W luminaire using 4x50W (1400mA 36V) LEDs. I plan on connecting them in 2 pairs in series (stack voltage=72V) using 1 LM3445 for each pair. My issue is that i want to incorporate the dimming function within my design so i was thinking of using the FILTR2 pin as an analog input for dimming rather than depending on an external TRIAC dimmer. The description on FILTR2s function says it “Could also be used as an analog dimming input”, i was wondering what the voltage range for dimming would be? Would a simple potentiometer and resistor network voltage divider from Vcc to GND connected to the FILTR2 pin of both LM3445s work? Any other precautions to keep in mind?
I understand that DIM can be used as an input if FILTR1 is pulled above 4.9V, would that be a preferable way to dim via an external PWM generator?
Should i just design an in-board triac dimmer and leave it at that?
Thank you all in advance!