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Design-in Guide - Philips Xitanium LED Xtreme SR driver
Sensor Ready Interface (DA+/DA-)
Xitanium LED Xtreme SR drivers reduce complexity and cost of luminaires
used in (wireless) connected lighting systems. They feature a digital SR (DA
+/DA-) interface to enable direct connection to any suitable CMS
controller or sensor. Functionality integrated into the SR driver eliminates
auxiliary components such as power supplies and relay boxes used in many
typical outdoor lighting controllers (OLC) today. The result is a simpler,
less expensive luminaire that enables turning every luminaire into a wireless
node and a more reliable DC powered controller.
The simple two-wire SR interface supports these key functions:
•
Switchable built-in SR bus power supply to provide power to the
connected control device.
•
Two-way digital communication between the SR driver and control
device, based on DALI 2 protocol
-
Standard DALI dimming, ON/OFF and control functions
-
Power and energy reporting utilizing the power monitoring
integrated in the driver
-
Diagnostic information
Built-in SR bus power supply
• The Xitanium Xtreme SR driver has the ability to supply the SR bus
with a built-in power supply that can be turned ON/OFF. By default
the power supply is turned on and ready to be used with an external
control device.
• It is recommended to turn off the SR supply when multiple drivers
are used in an SR network to avoid that wrong SR polarity can lead to
high currents on the SR bus.
• The built-in SR supply is capable of delivering a minimum current of
52 mA (ISR) to the SR bus and the connected device(s).
• The built-in SR supply will never supply more than 60mA
(ISR_MAX).
• The SR bus voltage will be between 12V and 20VDC depending on
the connected device load and the amount of SR supplies put in
parallel. See the graph below for the typical VI curve for one SR
supply.
• When the internal SR supply is switched OFF the SR driver will
extract a maximum of 2 mA from the SR bus (like standard DALI
gear).
Warning: Given the low surge immunity of the SR bus and
auxiliary supply, the use of Xitanium Xtreme SR drivers in a wired
luminaire-to-luminaire network is not supported. For this purpose
the use of Xi Full Prog drivers with DALI interface are available.
The SR and auxiliary supply wiring must remain within the luminaire
and must not be routed to a remote sensor/node or other
luminaire. Failure to observe this may result is damage to the
driver and EMC non-compliance!
Control device(s)
• Most control devices intended to be used in an SR system will be
powered from the SR bus or the 24VDC auxiliary power supply.
•
When communication is present on the SR bus, the bus gets pulled
down by the data packages. This reduces the average current
available for the power consuming control device. When
communicating the average available current can drop with 50%. This
should be taken into account when designing the control device.
• The extracted peak current (ISR_EXTRACTED) should be limited by the
control device.
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