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D-31M Datasheet(PDF) 7 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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 7 page
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09.07.2012
D-31M
7 of 7
0,5
2
4
8 kHz
Pulse duration
Working/Break On/Off
Voltage-to-current
converter U/I
Pulse/QCW
Frequensy
Current
+12V
GND
+5V
-5V
Synchronization
LED
Multiplexer
МХ1
Single-shot
multivibrator M
Pulse
generator
Sw1
Sw2
DC/DC
The single-shot multivibrator M generates voltage impulses with the adjustable fixed duration
synchronously with rise-up portion of input voltage impulses. Switching of duration of impulses is
carried out by means of switch SW1 in the range from 0,6 to 20 µ
с.
The multiplexer MX1 by means of the button “Operating mode” switch the clock pulses on the input
of voltage-to-current converter U/I. In addition clock pulses come to the jack “Synchro” for
synchronisation with the external photoreception amplifier.
The IR-light-emitting diode LED recive a pulse current from U/I converter. Start-up of circuit U/I is
carried out by means of the button “On/off”. The green light-emitting diode “Working” lights up in
that case . If the circuit of the LED is broken the light-emitting diode “Break” lights up. Adjustment
of the amplitude of the LED pulse current is implemented by means of a multiposition switch SW2.
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.
Fig.10. The block diagram of D-31M.




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