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PhlatLight ? DK-114N Series Development Kit Manual
5. Rotate all of the current controlling POTs (located at “P1”,
tor in Ohms. The sense resistor value is 0.005 Ω.
The
“P2” and “P3” on the control board and at “P1” on the driv-
er board) counter-clockwise until they stop. The imbedded
arrow should point towards the “10” on the POT. The POT
is now set at the minimum current setting.
6. The evaluation kit is now ready to be powered on. Turn on
the power supply. The supply will draw a small amount of
power.
7. To turn on any channel, open the enable pin by removing
the jumper. Both the fan on the heat sink and the LED will
power on.
Operating Instructions
There are multiple different ways the PhlatLight DK-114N De-
velopment Kit can be operated. The LEDs can be driven in con-
tinuous, current controlled mode via on board POTs or through
an external analog voltage. Additionally, each channel has in-
puts for an external function generator signal to pulse the LEDs
and is capable of pulsing at frequencies of greater than 40kHz.
1. To change the current when either the interface board or
driver board is enabled, rotate the on board POT. Each
POT will only function when enabled on the interface
board. Clockwise rotation increases the current, while
counter-clockwise rotation will decrease the current.
2. To change the current when the external adjust is enabled,
attach a 0-5V signal to the ADJ test points. These are la-
beled “T3”, “T4”, “T7”, “T8”, “T11” and “T12”. Each test
point is also labeled with either “GND” or “ADJ”. When
hooking up the 0-5V signal, ensure that the ground cable is
attached to the “GND” test point and the positive cable is
attached to the “ADJ” test point.
The current to the LED will adjust with the voltage signal.
output value will the be current going to the LED in amps
(A).
Sense Resistor Test Studs
Figure 17: Sense resistor location on driver board
18
16
14
12
10
8
6
4
2
0
A higher voltage corresponds with a higher current.
10
30
50
70
90
V Sense
I LED = ---------------
It is recommended not to exceed a 5V signal, as compo-
nents may overheat.
3. To measure the current going to the LED, use a volt meter
and measure the voltage across the sense resistor on the
driver board. For ease of probing, two test studs have been
placed to the left and right of “R15”. Figure 17 shows the
location of the test studs on the driver board. Figure 18
shows a conversion plot between the sense resistor voltage
and the current going to the LED. The current can also be
calculated by the following formula:
Equation 1
R Sense
where V Sense is the voltage measured across the sense re-
sistor in Volts (V) and R Sense is the value of the sense resis-
V Sense (mV)
Figure 18: LED Current vs. Vsense voltage
4. To modulate the LEDs through PWM, connect a function
generator to the test points labeled “PWM” and “GND”.
These test points are also labeled “T1”, “T2”, “T5”, “T6”,
“T9” and “T10”. The pulse output should be set to 0-5V,
where 5V represents off and 0V represents on.
Proper operation is best monitored by using a photo detec-
tor to observe the light output from the LED.
Figures 16 - 18 show plots of typical waveforms. The device
under test was a blue CBT-54 run at 14A and 50% duty cycle at
30kHz. Actual waveforms will depend on the specific driver
? 2009 Luminus Devices, Inc. - All Rights Reserved
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