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D-31M Datasheet(PDF) 6 Page - Roithner LaserTechnik GmbH

Part No. D-31M
Description  Driver for MID-IR LEDs
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Maker  ROITHNER [Roithner LaserTechnik GmbH]
Homepage  http://www.roithner-laser.com
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09.07.2012
D-31M
6 of 7
а
b
Fig.8. a: the button of frequency selection and the indicators of selected frequency,
b: multiposition switch for adjusting the pulse duration.
7. Switch on the LED current by depress the button “On/Off” (9). The green LED indicator
“Working” (10) will be turned on. In the event that the red LED indicator “Break” (11) go on
working that will be mean the failure of LED current (That is the LED is damaged). After that,
set the LED current using the switch 12 and table 15.
а
b
с
Fig.9. a: the LED current is off, b: the LED current is on,
c: the LED current is on, but the LED circuit is broken .
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.
The generator G forms the pulse sequence with variable repetition rate. The repetition rate can be
changed with the help of the button "Frequency". It's indicated by light-emitting diodes “2 kHz”, “4
kHz”, “8 kHz”, “16kHz”. The waiting multivibrator M and the multiplexer MX1 receive the voltage
impulses in the form of a meander from generator G .




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