Table of Contents
Advertisement
Design-in Guide - Philips Xitanium LED Xtreme SR driver
LED Module Temperature Protection (MTP)
This feature helps to protect the LED module when operated during
abnormal thermal application conditions. The thermal design of a
LED module should be designed in such a way that the temperature
of the LED module t
(life) ot t
c
application conditions. The utilization of an NTC (Negative
Temperature Coefficient resistor) serves the purpose to help
achieve the useful lifetime of the LED module if external thermal
influences result in the temperature for lifetime tc(life) being
exceeded. If this occurs then the light output will be reduced to
keep the temperature of the LED module below a predefined critical
temperature.
Xitanium Xtreme SR drivers are by default configured for the
following three standard NTC types:
1. 10 kilo Ohm NTC - Murata, p/n NCP18XH103J03R or
NCU18XH103J60R
2. 15 kilo Ohm NTC - Vishay, p/n NTCS0805E3153GMT
(previous p/n: 2381 615 54153)
3. 15 kilo Ohm NTC - Murata, p/n NCP15XW153E03RC
(+ separate 390 ohms resistor in series with the NTC)
Other NTC types are supported as long as they fall within a 5,000 ...
25,000 Ohm resistance range. The applicable values for R(25°C) and
β however need to be specified separately during MTP configuration
in MultiOne for proper MTP behavior.
MTP behavior setting
It is possible to set the temperature at which the MTP feature is
activated, defined by "MTP warn" and the slope, defined by "MTP
max". Using the MultiOne Configurator software these settings can
be changed.
•
Warning: follow the instrictions below for reliable MTP
behavior and to prevent damage to the driver NTC interface.
• Do not combine the NTC ground connection with the LED -
connection. These two connections must be kept separate.
• The length of each wire between the NTC driver interface and
the NTC on the LED module is not allowed to exceed 60cm.
Donot use shielded wiring.
• It is neither allowed to connect multiple MTP inputs
from multiple
drivers
multiple MTP interfaces share a common connection.
Always keep multiple MTP interfaces fully separated from
each other.
(max) is not exceeded under normal
c
in
parallel
nor
to
have
14
Advertisement
Table of Contents
