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DK- 414N- 4 Development Kit Manual
Figure 11: LED Current as a function of V sense
3. To control the current externally, connect the positive of a 0-5 V signal to the Analog ADJ pin and the
negative to the GND pin, using the signal cable. Figure 12 shows the relationship between the LED
current and the external voltage.
Figure 12: LED Current vs. External voltage
4. To modulate the LEDs through PWM, connect the 0-5 V pulsed output of a waveform generator across
the PWM and GND pins on the signal cable, with the PWM pin at a positive voltage with respect to GND.
The Analog ADJ and POT pins should be shorted to control the LED current via the on-board POT.
Proper operation is best monitored by using a photo detector to observe the light output from the LED.
Note: Exceeding 5 V on the PWM pin may cause permanent damage to the driver board.
5. Coreboard temperature (T ref ) of the CBM-380 is monitored using a Murata Manufacturing Co. thermistor
(part number NCP15XH103J03RC). Thermistor test points THRM1 and THRM2, if connected to the LED
by the driver board to LED cable, can be used to determine the coreboard temperature. Signal Pins 7
and 8 are also thermistor test points and are equivalent to THRM2 and THRM1. Figure 13 shows the
relationship between the temperature of the coreboard and the resistance between the thermistor test
points. Note that there is a temperature rise from T ref to the LED junction; for guidance on estimating the
LED junction temperature (T j ), refer to the CBM-380 product datasheet.
960031 Rev C ? Luminus Devices, Inc. All rights reserved.
Page 8
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