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DK- 414N- 4 Development Kit Manual
Driver board
to LED cable
Fan cable
Power supply
to driver board
cable
Driver control
interface
cable
Figure 10: Completed electrical connections on DK-414N-4
4. Operating Instructions
The DK-414N-4 Development Kit can be used to drive LEDs in continuous-current controlled mode via the
on-board POT or through an external analog voltage. Additionally, each channel has inputs for PWM
dimming using an external function generator and supports frequencies up to 40 kHz.
1. Current control via the on-board POT is achieved by shorting the Analog ADJ and POT pins. Clockwise
rotation of the POT increases the current, while counter-clockwise rotation decreases the current.
CAUTION: The driver board is capable of providing 14 A to any color. Each color has different drive current
limitations and care must be taken not to exceed these limitations. Consult product data sheets for current
and junction temperature limitations of specific colors. Do not set all drivers at maximum current output!
Doing so will damage the LED module.
2. To determine the current through the LED, measure the voltage across the sense resistor test studs
placed to the left and right of “ R9 ” ( see Figure 1). Figure 11 shows the relationship between the sense
resistor voltage (V sense ) and the LED current, I LED , which is also calculated using:
I LED ?
where the sense resistance, R Sense = 0.005 Ω.
V Sense
R Sense
(1)
960031 Rev C ? Luminus Devices, Inc. All rights reserved.
Page 7
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