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T Series Data Sheet
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Thermal Considerations
Even though the T Series converters have a very high
500 Watt AC-DC Converters
Since the operating temperature is of major importance to
reliability, the following conditions should be observed:
efficiency, the operating losses will heat the case. The two heat
sinks are designed to dissipate the power losses at maximum
output power over the specified temperature range without
forced cooling, if the convection cooling provides sufficient air
1.
2.
3.
4.
Do not cover heat sinks.
Do not obstruct air flow around the heat sinks.
Maximize free space around the converter !
If the power supplies and the loads are located in the
volume, without any obstruction for vertical air exchange below
and above the converter.
Due to the slightly higher power losses in output power and
current limitation mode, the maximum admissible ambient and
same enclosure, forced cooling is recommended. The T
units should be placed on the bottom of the enclosure.
5. Always check the maximum ambient and case
temperature after system integration.
case temperature is then lower than in output voltage
regulation mode.
P loss [W]
08003a
A built-in sensor disables the output in case of over-
temperature. The converter automatically recovers, when the
temperature falls below the limit.
Derating is required for applications with higher operational
ambient temperature. The fig. below shows the derating of the
output power versus operational temperature above the
ambient temperature of 71 °C of an LT17xx unit. Two different
conditions are shown:
a) Converter operating with convection cooling (solid line).
For example if the operational ambient temperature
reaches 80 °C, the output power should be limited to
approx. 290 W. In this case steady operation in output
40
35
30
25
20
15
10
5
Output current limitation
Output power limitation
Output voltage regulation
power or current limitation mode is not possible.
b) Converter operating with forced cooling (dotted line).
0
0
100
200
300
400
500
P o [W]
600
Under these conditions, the case temperature T C is
decisive. With sufficient cooling provided (air flow!), the
V i = 110 VAC
V i = 230 VAC
converter still delivers 550 Watts in voltage regulation
mode even at T A = 85 °C, provided that T C ≤ 95 °C ( T C =
measuring point of case temperature ; see Mechanical
Data ). At T C ≤ 90°C, steady operation in output power or
current limitation mode is still possible. Nevertheless, it is
not recommended to operate the converter continuously
close to T C max , since lifetime will be affected.
Fig. 43
Internal power losses versus nominal output power (T17xx)
P o [W]
550
08002
P o max (convection
cooling)
290
0
Output voltage
regulation mode
( I o <10 A)
Output power/current
limitation mode
( I o >10 A)
P o max
(forced cooling)
T A [°C]
–25
50
60
70
80
90 95 100
Fig. 42
Output power versus ambient temperature of T17xx
BCD20023 Rev AB, 02-Nov-2010
Page 23 of 31
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