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参数资料
| 型号： | LT1740-7Z |
| 厂商： | POWER-ONE INC |
| 元件分类： | 电源模块 |
| 英文描述： | 1-OUTPUT 500 W AC-DC REG PWR SUPPLY MODULE |
| 文件页数： | 16/32页 |
| 文件大小： | 1000K |
| 代理商： | LT1740-7Z |
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BCD20023 Rev. AA, 3-Sep-2008
Page 23 of 32
www.power-one.com
T Series Data Sheet
500 Watt AC-DC Converters
Since the operating temperature is of major importance to
reliability, the following conditions should be observed:
1. Do not cover heat sinks.
2. Do not obstruct air flow around the heat sinks.
3. Maximize free space around the converter !
4. If the power supplies and the loads are located in the
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.
Fig. 42
Output power versus ambient temperature of T17xx
Fig. 43
Internal power losses versus nominal output power (T17xx)
Thermal Considerations
Even though the T Series converters have a very high
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
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
case temperature is then lower than in output voltage
regulation mode.
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
power or current limitation mode is not possible.
b) Converter operating with forced cooling (dotted line).
Under these conditions, the case temperature TC is
decisive. With sufficient cooling provided (air flow!), the
converter still delivers 550 Watts in voltage regulation
mode even at TA = 85 °C, provided that TC
≤ 95 °C (TC =
measuring point of case temperature; see Mechanical
Data). At TC
≤ 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 TC max, since lifetime will be affected.
–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
0
100
200
300
400
500
600
Po [W]
40
35
30
25
20
15
10
5
0
Ploss [W]
Vi = 110 VAC
Vi = 230 VAC
Output current limitation
Output voltage regulation
Output power limitation
08003a
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