OSRAM OPTOTRONIC Constant current LED power supplies with 3DIM - Manual (Page 46)

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LEDset APPLICATIONS
3.4. +12Vset auxiliary supply
3.4.1. Aesthetic use
The LEDset interface provides a +12Vset supply voltage that
can be used in different ways: not only for thermal manage-
ment, daylight compensation and aging compensation, but
also for aesthetic purposes.
In addition to supplying the circuits shown above, the
+12Vset supply voltage can also be used for some “low-
power” LED applications, e.g. ring backlighting of a luminaire
switch (see fi gure 48).
CHIPLED or TOPLED low-power LEDs can be supplied by
connecting them directly to the +12Vset via a resistor (see
fi gure 46) or, in case of an MCU application, via a MOSFET/
transistor that can add a blinking feature or a smooth pulsing
solution (by using a PWM output of the MCU; see fi gure 47).
A ring-shaped light guide, for example, can create very nice
aesthetic effects without requiring an additional power supply.
Figure 46: +12Vset auxiliary supply – aesthetic use. Figure 47: +12Vset auxiliary supply – aesthetic use, controlled LEDs.
Figure 48: Application example:
ring backlighting of a luminaire switch.