OSRAM OPTOTRONIC Constant current LED power supplies with 3DIM - Manual (Page 9)

9
LEDset SPECIFICATIONS
2.3. Technical details
2.3.4. Insulation 2.3.1. Bias current (Iset)
2.3.2. +12Vset
2.3.3. Fault protection
This chapter gives a general overview of the technical details
of the LEDset interface. For further details and deviations
from this basic information, please refer to the datasheet
and instruction sheet of the respective control gear.
All ECGs with LEDset interface have the following minimal
insulation barriers:
There is no galvanic insulation between the LEDset interface
and the secondary circuit.
Note: If the LEDset ECG is to be used in a system that must
be classifi ed as SELV (Safety Extra-Low Voltage), any circuit
connected to the LEDset interface of an SELV or SELV-
equivalent control gear can only be used if double-insulated
from the mains.
The LEDset interface has no specifi c protection against elec-
trostatic discharge (ESD). Therefore, it is recommended that
any circuit (e.g. accessible potentiometer) connected to the
LEDset interface port has a proper insulation against touch-
able parts.
Moreover, the negative pole of the LED load (LED-) must not
be connected to the GNDset terminal.
The LEDset interface is an active interface since the Vset in-
put can actually generate a constant current output (bias
current), allowing the Vset voltage to be achieved through
“passive” circuits (e.g. current setting by resistor, light sen-
sors etc.).
The integrated current generator provides a very stable bias
current (Iset) of 274 µA over the complete operating range of
the control gear. Thanks to this feature, unwanted current
variations due to temperature changes, which occur in many
ECGs with similar control interfaces, can be avoided.
The stabilized 12 V auxiliary voltage is able to supply a
current of up to 15 mA (laux). The voltage accuracy is within
a tolerance of ±10 %. A future power extension will provide
an even greater capability to supply more powerful loads
(such as an external fan for active cooling applications).
For details regarding the maximum allowable output power,
please refer to the datasheet and instruction sheet of the
respective control gear.
The +12Vset is protected against short circuit (+12Vset –
GNDset). Vset is protected up to the 12 V + 10 %.
Table 2: Insulation barriers of LEDset ECGs.
Primary
circuit
Secondary
circuit
LEDset
Primary
circuit
–
Depending
on the ECG
Depending
on the ECG
Secondary
circuit
Depending
on the ECG
– No insulation
LEDset
Depending
on the ECG
No insulation –