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OPERATION MANUAL
Driver for MID-IR LEDs, QCW and Pulse Mode
1. Application
The driver D-31M is designed as power supply of Mid-IR LEDs.
2. Features
•
The driver D-31M provides two modes of operation: Quasi Continuous Wave mode (the mode
of maximum average optical power from the LED) and pulse mode (the mode of maximum
peak optical power from the LED).
•
The possibility to tune the LED current amplitude, repetition rate and pulse duration, to select
the optimal mode of the LED.
•
The synchronization capability with a lock-in amplifier or with some other device.
•
Easy and durable in use.
WARNING!
Do not use multimeter to control the adjust current!
Please, contact your provider regarding these questions.
3. Service Conditions
Temperatur tolerance
Relative air humidity (at temperature + 35°С)
Atmospheric pressure
4. Technical Characteristics
Input Voltage
Voltage Tolerance
Power Consumption
Board Dimensions
Weight
Item
Pulse Duration
Repetition Rate (Frequency)
Output Current Amplitude
09.07.2012
D-31M
Item
-15 °С..+50 °С
less then 80 %
86 - 107 kPa
+12 V, stabilized, unipolar
90 x 50 x 25 mm
QCW Mode
31 – 1000 µs
0.5 – 16 kHz
20 – 250 mA
D-31M
Value
-5 ... +5 %
<4 W
90 g
Pulsed Mode
0.6 – 20 µs
0.5 – 16 kHz
0.1 – 2.0 A
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Summary of Contents for Roithner LaserTechnik D-31M
- Page 1 The driver D-31M is designed as power supply of Mid-IR LEDs. 2. Features • The driver D-31M provides two modes of operation: Quasi Continuous Wave mode (the mode of maximum average optical power from the LED) and pulse mode (the mode of maximum peak optical power from the LED).
- Page 2 14. The green LED indicator of QCW mode. 15. Lookup table of switch position and LED current amplitude. (The table for switch position correlation with LED current amplitude) Fig.1.Appearance of the driver and its interface. 09.07.2012 D-31M 2 of 7...
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Page 3: Mode Description
Please, don’t use the combination of frequency and pulse duration that gives a duty cycle more than 10 percents (table 1). Note! We recommend to use the pulse current amount to 2 A only at pulse duration less than 1 µs. Otherwise used LED can be broken. 09.07.2012 D-31M 3 of 7... - Page 4 LED (It’s marked with the red point too). In the case of wrong junction the LED can be damaged. Fig.4. Observance of polarity during the connection between the LED and the LED connector (1). Note! LED case must be electrically isolated. 09.07.2012 D-31M 4 of 7...
- Page 5 2. If necessary with the help of cable for synchronization connect the signal detector with the driver D-31M (jack “SYNCRO” (7)). Fig.5. The polarity of jackplug of cable for synchronization. 3. Insert the jackplug of power cable (stabilized, unipolar voltage, 12V) into connector "+12V DC"...
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Page 6: Block Diagram
8. Please, ascertain that the running LED current complies with the LED specification. 8. Block Diagram The driver block diagramme (pulse power supply) D-31M is presented in fig.10. The pulse power supply of light-emitting diodes functionally consists of generator G, single-shot multivibrator M, multiplexer MX1, voltage-to-current converter U/I, the pulse power supply converter DC/DC. - Page 7 The DC / DC circuit is a voltage converter from + 12 V in + 5 V, -5 V for power supply of all the elements of the D-31M. The input voltage of DC / DC converter supplies from “+12 VDC” jack.
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