OSRAM OPTOTRONIC Constant current LED power supplies with 3DIM - Manual (Page 8)

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LEDset SPECIFICATIONS
2.2.2. Implementation in the OSRAM ECG
Based on the general LEDset specifi cation, two different
LEDset implementations can currently be found in constant-
current OSRAM ECGs (for details, please refer to the data-
sheet of the specifi c product).
Note:
Vmin is the Vset voltage value corresponding to the minimum
deliverable current (Imin) of the ECG. The Imin is specifi ed in
the datasheet of the applied ECG. Based on the LEDset rela-
tionship between Iout and Vset, it is possible to calculate the
typical Vmin of the ECG.
Example:
When using the OT 35/220-240/700 with a nominal current
of 700 mA, the minimum current is 100 mA (according to the
datasheet of the ECG) and the Vmin is as follows:
Basically, the two cases differ due to the minimum current
limitation of the ECGs. An ECG’s turn-off capability – rather
than the minimum current holding between Vmin and 0 V –
makes the difference between the cases.
The following diagrams describe the different cases imple-
mented in OSRAM LEDset ECGs:
Figure 4a: Case I. Figure 4b: Case II.
Product examples:
3DIM + LEDset (LT)
OT 45/220-240/700 3DIMLT E
OT 90/220-240/700 3DIMLT E
LEDset
OT 90/220-240/700 LT E
Product examples:
LEDset (LT) + current setting (CS)
OT 35/220-240/700 LTCS
OT 45/220-240/700 LTCS
Imin
Inom
Vmin Vmin 9 + 1 2.28 V