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參數(shù)資料
| 型號： | LT1701-7DFB1 |
| 廠商： | POWER-ONE INC |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-OUTPUT 550 W AC-DC REG PWR SUPPLY MODULE |
| 封裝： | CASE T01, MODULE |
| 文件頁數(shù)： | 20/33頁 |
| 文件大小： | 838K |
| 代理商： | LT1701-7DFB1 |
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Rugged Environment
AC-DC Converters >100 Watt
T Series
Edition 4/4.99
27/33
MELCHER
The Power Partners.
0
100
200
300
400
500
600
Po [W]
45
40
35
30
25
20
15
10
5
0
Ploss [W]
Ui = 110 Vrms
Ui = 230 Vrms
Output current limitation
Output voltage regulation
Output power limitation
08003
–25
50
60
70
80
90
100
TA [°C]
0
550
290
Po [W]
Po max
(forced cooling)
Po max
(convection
cooling)
Output power/current
limitation mode
(Io >10 A)
Output voltage
regulation mode
(Io <10 A)
95
08002
Fig. 49
Output power versus ambient temperature of T 17xx
Fig. 50
Internal power losses versus nominal output power of
T 17xx
Environmental Conditions
Thermal Considerations
Despite the fact that the T series have a very high efficiency
the operating losses of the unit will heat the case. The heat
sinks are designed to dissipate the power losses at maxi-
mum output power over the specified temperature range
without forced cooling if the convection cooling provides
sufficient air volume, without obstructions for vertical air ex-
change below and above the units.
Because of the slightly higher power losses in output power
and current limitation mode the maximum admissible am-
bient and case temperature is then lower than in output
voltage regulation mode.
The T series have a built-in overtemperature shut down to
protect the internal circuitry.
Derating is required for applications with higher operational
ambient temperature. Fig.:
Output power vs. ambient tem-
perature shows the derating of the output power versus op-
erational temperature above the specified ambient tem-
perature of 71
°C of an LT 17xx unit. Two different condi-
tions are shown:
a) Unit operating with convection cooling (solid line).
For example if the operational ambient temperature
reaches 80
°C, the maximum output power should be lim-
ited to approx. 290 W. In this case steady operation in
output power or current limitation mode is not possible.
b) Unit operating with forced cooling (dotted line).
Under these conditions, the case temperature of the T
unit is decisive. With sufficient cooling provided (air
flow!), the unit still delivers 550 Watts output power in
voltage regulation mode even at 85
°C ambient tempera-
ture, provided that the maximum case temperature of
95
°C is not exceeded (Measuring point of case tempe-
rtature TC, see: Mechanical Data). If the case tempera-
ture does not exceed 90
°C, steady operation in output
power or current limitation mode is still possible. Never-
theless it is not recommended to operate the units con-
tinuously close to the maximum case temperature since
life time will be reduced.
Since the operating temperature of a power supply is of
major importance to reliability the following conditions
should be considered:
1. Do not cover heat sinks.
2. Do not obstruct air flow around the heat sinks.
3. Maximize free space around the units.
4. In a system where the power supplies as well as the
loads are located in the same enclosure, forced cool-
ing is recommended. The T units should be placed in
the lower section of the enclosure.
5. In a closed system heat may build up causing exces-
sive temperatures.
6. Always check the maximum ambient and case tem-
perature after system integration.
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