OSRAM OPTOTRONIC Constant current LED power supplies with 3DIM - Manual (Page 12)

12
LEDset APPLICATIONS
3.1. Current setting
3. LEDset applications
3.1.1. Setting by external resistor
If the application requires a specifi c fi xed output current, the
easiest way to set the output current is to apply a resistor
between Vset and GNDset.
As mentioned in chapter 2.3.1., the LEDset interface is an
active interface that is able to generate a constant current
output (Iset) and thus allows the use of “passive” circuits
(e.g. resistor) to achieve the setting voltage (Vset).
The resistor can be placed either on the terminal block of the
ECG or on the LED module (plug-and-play solution but with
two additional wires that have to be considered for cabling
design).
As a function of the LEDset interface, the Vset value is
related to the percentage of the ECG’s maximum nominal
current.
This means that the absolute value of the output current
depends on the maximum nominal current of the ECG.
Setting the output current Iout
max
on an ECG with Inom
max
=
700 mA will differ from setting the same Iout on an ECG with
Inom
max
= 1500 mA.
Figure 6: Current setting by external resistor.
Iout ( Vset 1 )
Inom
max
9
100
[
%
]