User manual

tams elektronik
LKS-1 English
short operating duration. The LKS-1 limits the current at the output to
25 mA. Thus it is possible to connect LEDs directly (without series
resistor).
Connecting LEDs
You can connect one LED or several LEDs in series directly (without
series resistor) to one LKS-1. The maximum number of LEDs you can
connect to one PCB depends on the voltage supplied and the
fluorescent colour of the LEDs.
Maximum number of LEDs per PCB connected in series
Forward
voltage of
the LEDs
*1
Nominal /
operating voltage
of the transformer
(=)
*2
Max.
number
of
LEDs
*3
Nominal /
operating voltage
of the transformer
(~)
*2
Max.
number
of
LEDs
*3
2 V 12 V / 12 V 5 12 V / approx. 17 V 7
4 V 12 V / 12 V 2 12 V / approx. 17 V 3
2 V 16 V / 16 V 7 16 V / approx. 22 V 10
4 V 16 V / 16 V 3 16 V / approx. 22 V 5
2 V 18 V / 18 V 8 18 V / approx. 25 V 11
4 V 18 V / 18 V 4 18 V / approx. 25 V 5
*1
The forward voltage of white and blue LEDs is approx. 4 V, differing coloured LEDs approx.
2 V.
*2
Nominal voltage and operating voltage: The operating voltage with a.c. transformers is
approx. 1,4 times the nominal voltage given on the transformer. With d.c. power packs the
operating voltage corresponds to the given nominal voltage.
*3
Tolerance and / or voltage fluctuations in practice often cause the calculated operating
voltage not being available. For that reason it is recommended to connect one LED less than
possible in theory.
Page 15