PicoBuck Overvie
Since the PicoBuck is a constant current driver, the current drawn from the
supply will drop as supply voltage rises. At 12V, the PicoBuck drives the
three LEDs on our Rebel Triple Play board at 350mA per LED while
drawing less than 350mA total from the power supply.
Three signal inputs are provided for dimming control. You can use the
PWM signal from an Arduino or your favorite microcontroller to dim each
channel individually, or you can tie them all to the same PWM for
simultaneous dimming. A separate ground pin (labeled GND) is provided to
reference against the controlling module for accuracy. The pin spacing for
the two pairs of pins is 0.1", but the two pairs are slightly 0.2" apart, to allow
for a 2.54mm pitch screw terminal pair to be used, or for a five-position
standard 0.1" header with the middle pin removed. Dimming can be done
by an analog voltage (20%-100% of max current by varying voltage
from .5V-2.5V) or by PWM (so long as PWM minimum voltage is less
than .4V and maximum voltage is more than 2.4V) for a full 0-100% range.
Signal Inputs
The power supply pads are sized for 3.5mm screw terminals, as are the
output pads. Each output is independent from the other two.
Power Input
