So I have a "working" setup using a constant current driver NCP3066 in the circuit as follows:
When I toggle the on/off switch, the LEDs will toggle, but when I replace the two LEDs in series with one LED or three series LEDs, the circuit still works for the most part, but with severely altered (lower) drive current.
I have read the datasheet (http://www.onsemi.com/pub_link/Collateral/NCP3066-D.PDF) but still have some questions for anyone who has worked with this sort of driver or has some sort of electronics/circuits background:
1) Why isn't my driver outputting constant current independent of the load?
2) How can I alter the current? Right now I'm only getting ~60mA with 2 blue LEDs in series, but halving the resistance of either 1.5ohm resistor does not seem to do anything to my current
output...despite what the datasheet and common sense says should happen
p.s. I'm doing all of this on my college breadboard, could the internal resistance/hole resistance of that be overriding the small resistors I'm using?
When I toggle the on/off switch, the LEDs will toggle, but when I replace the two LEDs in series with one LED or three series LEDs, the circuit still works for the most part, but with severely altered (lower) drive current.
I have read the datasheet (http://www.onsemi.com/pub_link/Collateral/NCP3066-D.PDF) but still have some questions for anyone who has worked with this sort of driver or has some sort of electronics/circuits background:
1) Why isn't my driver outputting constant current independent of the load?
2) How can I alter the current? Right now I'm only getting ~60mA with 2 blue LEDs in series, but halving the resistance of either 1.5ohm resistor does not seem to do anything to my current
p.s. I'm doing all of this on my college breadboard, could the internal resistance/hole resistance of that be overriding the small resistors I'm using?