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07/2020
Corona II
– LED Line Scan Illumination
PMA_CHR_CD40069_R05_Manual_Corona-II_XLC4
149
8.4.3 Calculation of maximum module temperature
The maximum temperature of the Corona II housing can be estimated by using the following
formula:
5
3
2
1
F
F
F
R
P
T
T
TH
CORONA
A
CORONA
+
=
T
Corona
Temperature of Corona II surface at hottest point
T
A
Ambient temperature
P
Corona
Electrical power input into one Corona II channel.
It is assumed that a Corona with several channels is operated with a
unique operating current
I
WORK
for all channels.
To get the typical channel power in dependency of
I
WORK
refer to
“Chart 1”
R
TH
Thermal resistance of heat sink; refer to the table in section 8.4.2.
F
1
Correction factor for mounting orientation
F
1
=1.0 for horizontal mounting
F
1
=0.85 for vertical mounting
F
2
Length-dependent correction factor
F
2
=0.88 for 170 mm
F
2
=0.92 for 340 mm
F
2
=0.97 for 510 mm
F
2
=1.0 for 680 mm
F
3
Thermal-coupling-dependent correction factor
F
3
=1.0 for free mounting without additional heat flow over solid metal
connections.
F
3
=1.0 down to 0.8 (depends on heat flow conditions in application)
5
The correction factors F1 to F3 are only needed for the passive cooling options A to C