MCDMULTICHANNEL LED DRIVERINSTRUCTION MANUAL

rev. 100616

TABLE OF CONTENTS
General Information
Application
Features
Operation conditions
Driver layout
Operating mode description
Operating instruction
Driver connections
Technical characteristics

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HEAD OFFICE LED Microsensor NT, LLC ● R&D CENTRE Microsensor Technology, LLC
 194223, postbox 100, St.Petersburg, Russia ● info@lmsnt.com ● www.lmsnt.com

GENERAL INFORMATION

Application
MCD driver is a utility board that unites several functions:- power supply of arrays comprising of Mid-IR LEDs, supporting up to 8 channels;- photodiode signal processing and amplification;- synchronisation of LED and photodiode signals.

Compatibility table
One-element LED models
LmsXXLED
LmsXXLED-R

LmsXXLED-RW
LmsXXLED-TEM
LmsXXLED-TEM-RStandard multielement LED models
LmsXXLED-4M

LmsXXLED-4M-R

LmsXXLED-4M-RW
LmsXXLED-4M-TEM
LmsXXLED-4M-TEM-R

Lms18-..-23LED-6M

Lms18-..-23LED-6M-TEM

Note! Please contact us to specify compatibility of custom multielement LED models.

Features Pulse mode operation (mode that provides maximum peak optical power).
 LED current amplitude and pulse duration are preset by manufacturer according
to a customer’s request.
 Ability to work either with PD models without a built-in preamplifier (enabling
an on-board MCD preamplifier) or with PD models with a built-in preamplifier*.
 Built-in 8-channel synchronous detector, which provides synchronisation of LED
signals with a photodiode preamplifier and further signal amplification.

Operation conditions
Indoor operation only. Ingress Protection Rating IP00.

*You should choose the photodiode model (with or without a built-in preamplifier) to work with MCD driver beforehand,since the driver is able to operate with only one photodiode type and should be tuned in advance accordingly.

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 194223, postbox 100, St.Petersburg, Russia ● info@lmsnt.com ● www.lmsnt.com

DRIVER LAYOUT

4GND + GND +5V

5GND

ch.8

channel 1-8 anodes
ch.7

ch.2

ch.1

ch.3

ch.4

ch.5

ch.6

6

1+-3++++++++-+-2
1. Power input terminal block.
2. LED connection contacts.
3. Photodiode connection contacts.
4. Photodiode preamplifier connection terminal blocks.
5. Synchronous detector signal output contacts.
6. Output signal gain adjustment potentiometers.

Note! Please refer to your provider if you have any questions.

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HEAD OFFICE LED Microsensor NT, LLC ● R&D CENTRE Microsensor Technology, LLC
 194223, postbox 100, St.Petersburg, Russia ● info@lmsnt.com ● www.lmsnt.com

OPERATING MODE DESCRIPTION
MCD driver drives LEDs in a pulse mode. This mode provides LED maximum peak
optical power. LED current value is 0.4 A per channel (by default), pulse duration valueof every channel is 20 µs (by default). Frequency of each channel is 500 Hz; 8-channel
frequency is 4 kHz, this corresponds to photodiode reading frequency.
Every channel lights up sequentially; this enables scanning of a certain spectral
range covered by a multielement LED array.
channel 1channel 2channel 3channel 4channel 5channel 6

20µs

2ms

250µs

250µs

250µs

250µs

250µs

250µs

channel 7250µs

channel 8

Pulse mode current-time relation.

Pulse duration and current values can be readjusted by manufacturer.

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 194223, postbox 100, St.Petersburg, Russia ● info@lmsnt.com ● www.lmsnt.com

OPERATING INSTRUCTIONS
1. Carefully and securely connect (via soldering) cathode/anode pins of the LED arraywith LED driving contacts (2).
LED - pins

LED inputcontacts

LED + pins

Note! Picture above is for illustration only. Pay your attention to LED electrodes
configuration appropriate to your LED array referring to the technical report for thearray. Also observe the polarity of each element of the array: “P1”, ”P3”, “P5”, ”P7”,“P9”, ”P11”, “P13”, ”P15” contacts should be connected to the anodes of LEDs.
Improper connection may cause LED damage.
Note! LED matrix case must be electrically isolated from the ground.
Important! You should choose the photodiode model (with or without a built-inpreamplifier) to work with MCD driver beforehand, since the driver is able to operatewith only one photodiode type and should be tuned in advance accordingly. Take one of
the two following steps (2a or 2b) basing on your choice.
2a. Carefully and securely connect (via soldering) a photodiode with photodiodeconnection contacts (3). Photodiode cathode and GND should be electrically connected.
key

cathodephotodiode

anode

GND

photodiodeinput contacts

Note! Ensure the wires’ shortest possible length between a photodiode and MCD
board.
Note! Provide reliable screening of the wires.
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 194223, postbox 100, St.Petersburg, Russia ● info@lmsnt.com ● www.lmsnt.com

OPERATING INSTRUCTIONS
2b. If you use LMSNT photodiode with a built-in preamplifier (LmsXXPD-XX-PA models),then connect preamplifier cords to preamplifier input terminal blocks (4) as following:
signal input terminal block

5V power output
terminal block

photodiode with a built-inpreamplifier

White cord – to the power output “+”; Brown cord – to the power output “0”;green cord – to the signal input “+”; Yellow cord – to the signal input “0”3. Connect signal output contacts (5) with signal observing device (multimeter,oscilloscope or PC via ADC).

oscilloscope

signal output
contacts

4. In case of need adjust amplification signal gain for each channel with the help of theappropriate potentiometers (6).
6. Connect a power supply to the power input (1).

12V power input
contacts

Note! Please follow the requirements presented in the table on the “TechnicalCharacteristics” page to provide driver’s faultless operation.

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HEAD OFFICE LED Microsensor NT, LLC ● R&D CENTRE Microsensor Technology, LLC 194223, postbox 100, St.Petersburg, Russia ● info@lmsnt.com ● www.lmsnt.com

DRIVER CONNECTIONS
External device:
Signal output oscilloscope orconnection PC via DAQ
GND

Photodiode preamplifier
input connection“+” of channels
ch.8

1 2 3 4 5 6 7 8 GND
ch.7
ch.2

ch.1

ch.3

ch.4

ch.5

+

Photodiodeinput connection

-ch.6
ch.1

Signal gain adjustment potentiometers (1x-10x)

ch.2

MCD

ch.3
LEDs input
connection

ch.4
ch.5

Power input
DC 12V 0.25A

ch.6+

ch.7
ch.8
GND++++++++-GND

MCD connections

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 194223, postbox 100, St.Petersburg, Russia ● info@lmsnt.com ● www.lmsnt.com

TECHNICAL CHARACTERISTICS

Input voltage
Voltage tolerance
Input current
Board dimensions
Signal output voltage amplitude

Fixed parameters
Pulse duration
Frequency (per channel)
Frequency (8 channels)
Output current amplitude
Adjustable parameters
Output signal gain

+12 V, stabilized-5..+5 %max. 0.25 A
105×70×15 mm
11 V(-4 V for inverted photodiode signal)20 µs
0.5 kHz4 kHz
0.4 A
1x-10x

Pulse duration and current values in the table are default, but can be preadjusted by manufacturer.
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 194223, postbox 100, St.Petersburg, Russia ● info@lmsnt.com ● www.lmsnt.com