Specifications
Philips Fortimo HBMt Gen 3 System Design In Guide 17
Thermal de-rating
The Fortimo High Brightness Module contains a thermal de-rating system to detect
overheating and extreme lifetime degradation of the LEDs when operated outside
the maximum permitted temperature conditions. Such conditions can be caused by
extreme ambient conditions or inadequate heat management design. The thermal
de-rating is based on temperature detection on the module. When multiple
modules are connected to 1 driver, one module is in the “master” mode and the
others are in the “slave” mode. It is strongly recommend that the module with the
highest Tcase in the application is used as the “master” module.
How does it work?
The thermal de-rating system is a default feature in some Philips Advance Xitanium
LED drivers. When the case temperature rises above the specied limit, the driver
switches to a lower LED output current. When the case temperature drops below
the specied limit, the system will resume normal operation.
Warning!
• MTP is only a failsafe in order to protect the module against
overheating during peaks in ambient temperature or in the event
of a faulty heat sink design. Optimum performance will only be
achieved if the Tcase meets the thermal boundaries stated above
and measured ccording to the procedure described below
• MTP diagnostic feature cannot be used for Tcase measurements
• Not all drivers have the thermal de-rating system, please refer
to individual Xitanium LED driver specification