OSRAM OPTOTRONIC Constant current LED power supplies with 3DIM - Manual (Page 6)

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LEDset SPECIFICATIONS
2.1. General overview
LEDset is a 3-wire analog control interface designed for
OPTOTRONIC ® constant-current LED power supplies. It
allows setting the output current of the electronic control
gear (ECG) by providing a highly accurate voltage reference
(Vset) to the ECG. Thanks to the control accuracy and sim-
plicity of LEDset, control gears become highly adaptable and
can cover a wide range of applications. The output current
can be set/dimmed by a passive device (e.g. resistor) or by
an external imposed-voltage control signal.
Moreover, the interface gives more freedom in the design of
customized systems by providing a stabilized 12 V auxiliary
voltage (+12Vset) that can supply an active circuit, for exam-
ple on the LED module, extending a simple temperature-
dependent current derating circuit to a more complex micro-
controller-based fl ux control.
The main features of the LEDset interface can be
summarized as follows:
• Output current setting interface for constant-current ECGs
• 3-wire interface
– +12Vset: Stabilized 12 V auxiliary voltage (+/-10 %)
– Vset: Voltage reference in the range of 0 to 12 V (+10 %)
– GNDset: Ground reference of the LEDset interface
• Output current setting by analog input voltage control (Vset)
– For current setting, the Vset control voltage is within the
range of 10 V
– The LEDset characteristic is a fi xed relationship between
the Vset voltage and the percentage of the maximum
nominal current of the control gear (relative coding)
• High-output LED current accuracy
– Overall control system provides an Inom
max
tolerance
of up to +/-5 %
– Accurate bias current generator on Vset for very precise
current setting via passive control (fi xed/variable resistor)
• 12 V auxiliary output (+12Vset) for the supply of electronic
ICs/circuits or the control of a fan (future extension)
• ECGs can be used in a wide power and current operating
range
2. LEDset specifi cations
Figure 2: LEDset interface wiring (block diagram).