1.5
VIVISUN® LED pushbutton caps can be specified in a wide range of electrical configurations to meet specific design objectives. Options that can be specified for both Standard Square and Large Rectangular caps include the number of common grounds, polarity, voltage options, adding blocking diodes and/or internal Press-To-Test circuitry, and lighting segment interconnect options.
LED Circuit Configurations
Standard Square and Large Rectangular caps each have four quadrants that can be controlled individually. Each quadrant has its own independent electronic circuit including the Driver, Dimming and Protection Circuit (DDPC) needed for their operation. Standard Square caps contain 16 solid state LEDs, four per quadrant, and all the electronics necessary for display illumination. Large Rectangular caps contain 24 solid state LEDs, six per quadrant, and all the electronics necessary for display illumination.
The LED circuit is either a single circuit with one common or it is a horizontal split circuit with two commons.
Example: Single Common |
Example: Split Common |
Polarity
The LED circuit in Standard Square caps can be either common anode (current sinking) or common cathode (current sourcing). For Standard Square DC voltage caps, polarity is referenced with respect to commons G and F. Standard Square AC voltage caps and Large Rectangular caps are polarity insensitive.
Power Consumption
The typical power consumption of the LED illuminated pushbutton cap at 23° C is 1.18 watts for 28 VDC units. See Figure 1.5.1-A for current draw of caps at various voltages. For Voltage dimmed caps, current draw varies linearly with applied voltage. For Discrete Dimming caps, current draw of each mode will vary, but will not exceed the amounts shown in Figure 1.5.1-A.