OSRAM PrevaLED Core Z3 - Manual (Page 15)

15
PrevaLED ® Core Z3 LED modules | Thermal considerations
Please note:
A thermal design must always be confi rmed by performing
a thermal measurement in steady-state condition.The whole
area of the PCB must be in contact with solid material of the
heat sink. In the following, you fi nd two examples of how to
cool a PrevaLED
® Core Z3 LED module.
Example 1:
LED module: PL-CORE 1100-827
Heat sink: Fischer SK572 height: 37.5 mm
TIM: Kerafoil 86/82
T
ambient
: 25 °C
Temperature at the t
c
point: 61 °C
Example 2:
LED module: PL-CORE 5000-830
Heat sink: Sunon LA003-012A82DY
(active cooling solution with 12-V fan)
TIM: Kerafoil 86/82
T
ambient
: 25 °C
Temperature at the t
c
point: 57 °C
Please note that the shown solutions are just examples. A
thermal system always depends on many factors, such as
airfl ow, ambient temperature etc. Please check your entire
cooling system by performing a thermal measurement in
steady-state condition. The list below is a selection of sup-
pliers of different cooling solutions.
4.4 T
c
point location and temperature measurement
The t
c
point is the location to check if the chosen cooling
solution (heat sink and TIM) is suffi cient to ensure the LED
module performance. The t
c
point is located on the back of
the LED module under the center of the diffuser (see image
below).
To ensure a lifetime of 50000 hours (L
70
B
50
), the reference
temperature (t
r
) at the t
c
point must not exceed 65 °C. The
maximum temperature reached at the t
c
point must not
exceed 85 °C. A correct temperature measurement can,
for example, be performed with a thermocouple.
4.5 Thermocouple
Use a thermocouple that can be glued onto the LED module.
Make sure that the thermocouple is fi xed with direct contact
to the t
c
point. Examples of suitable thermo couples:
Cooling systems
Nuventix www.nuventix.com
Sunon www.sunoneurope.com
Cooler Master www.coolermaster.com
AVC www.avc-europa.de
SEPA www.sepa-europe.com
Fischer Elektronik www.fischerelektronik.de
Meccal www.meccal.com
Wakefield www.wakefield.com
R-Theta www.r-theta.com
Cool Innovations www.coolinnovations.com
Different thermocouples
Illustration Description Temperature range [°C]
PVC-insulated
thermo couple
-10 … +105
PFA-insulated
thermo couple
-75 … +260
Sprung
thermo couple
-75 … +260
K-type thermocouple with miniature connector
t
c
point
2D code
Location of the t
c
point