Appendix A: Contents of DK-114N-1 and DK-114N-3
Appendix B: Grounded Common Anode Topology
PT, CBT and CST series Big Chip LEDs are built with a common anode configuration, where the copper coreboard is at a positive
electrical potential with respect the LED cathode. In a system with multiple LEDs in direct contact with a common heat sink, the
common anode configuration causes poses a challenge to electrically addressing and isolating individual LEDs. The driver board in
the DK-114N-1, based on National Semiconductor’s LM3433 IC, addresses the challenge of connecting multiple common anode LEDs
by utilizing a grounded common anode topology, i.e., the anode is kept at ground and the cathode is at a negative potential, thus
enabling LEDs to be in contact directly with the heat sink. A basic schematic, using three grounded common anode LEDs is shown
below in Figure 14. It is important to note that while the heat sink is at ground, there is still power passing through it.
Figure 14: Grounded common anode configuration
9
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DK-114N series - Development Kit Manual
Table 2: Table of Contents
DK-114N-1
DK-114N-3
Description
Quantity
Quantity
Driver board
1
3
Heat sink with mounting screws
1
3
Power supply to driver board cable
1
3
Driver board to LED cable (short, 8-pin
or 10-pin LED connector)-five variants
1 each
3 each
Driver board to LED cable (long, for 2-
pin spade connector)
1
3
Signal cable
1
3
Thermistor cable
1
3
TIM sheets
4
12
User Manual
1
1