In part 3, we examine A-type and B-type dimming for constant current drivers, including reviewing how each type works, what the pros and cons of each are, and how to dim multiple drivers simultaneously. Part 4 will cover A-type and B-type constant voltage drivers.
This is a subject I touched on in an earlier video where I tried to run about 175 volts worth of LED (5 COBs) off of a driver only rated for 143 volts max. The result in that test was that the driver maintained its full voltage (~143v), but put out next to nothing for current. What I set out to test this time was what would happen if you were trying to pull just a handful of volts more than the driver was rated for, as opposed to trying to pull 30+ more than rated. By adding resistors in series with my 4 COB lights, I was able to slowly increase the voltage drop of my circuit to meet and exceed the max rating of my driver and see how it reacted.
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