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参数资料
| 型号： | LT1240-7Z |
| 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： | 11/32页 |
| 文件大小： | 1000K |
| 代理商： | LT1240-7Z |
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BCD20023 Rev. AA, 3-Sep-2008
Page 19 of 32
www.power-one.com
T Series Data Sheet
500 Watt AC-DC Converters
For systems, where only a small battery back-up time is
required, battery charging by one T unit may be sufficient; see
also fig. below.
Caution: Lead-acid batteries can generate certain amounts of H2
and O2 gas, which can form explosive gas mixtures. Sufficient
ventilation must be provided in battery cabinets and installation
rooms.
Note: Local regulations must be observed. Further information
about designing battery systems is contained in VDE 0510, part 2.
Combination with DC-DC Converters
The T Series converters are designed to be operated with DC-
DC converter loads. Particularily suitable are 48Q models, as
they start working at approx. 38 V, thus avoiding high currents
at ramp-up. But also other series may be used, for instance our
CQ or P Series.
In a complete power system consisting of several T converters
connected in parallel combined with 48Q/CQ units, it may be
desirable to have one common signal indicating the status of
the whole system.
The DC-DC converters provide a galvanically isolated signal
Out OK. To obtain a logic AND, all Out OK signals should be
connected in series; see fig. below:
If in a system with 2 redundant T Series converters Power
Down is desired as one common signal, simply connect the D
pins of the two T converters. Then, Power Down only becomes
active, if both T converters fail, which would result in the bus
voltage failing (see fig. below).
+
–
Out OK–
Out OK+
+
–
48Q/CQ
+
–
Out OK–
Out OK+
+
–
48Q/CQ
+
–
Out OK–
Out OK+
+
–
48Q/CQ
L
N
Vo+
Vo–
T1700
L
N
Vo+
Vo–
L
N
Sys Out
Sys In
D
T1700
Sys In
D
Overall
System
Good
Power
Down
+
–
R
06082a
Fig. 35
Overall System Good and Power Down signal in a redundant
system
Fig. 36
Disconnecting the loads at low battery voltage in case of
mains’ failure
Fig. 37
Storing the System Good signal
Low-Battery Discharge Protection
Since all monitoring functions are powered by the output of the
T converter or the battery, in the case of a mains’ failure, Power
Down can be used to monitor the status of the battery and to
disconnect the load or part of it via the inhibit of the connected
DC/DC converters, when the battery voltage drops below the
threshold level of Power Down. This prevents further discharge
of the battery.
+
–
Out OK–
Out OK+
+
–
48Q/CQ
+
–
Out OK–
Out OK+
+
–
48Q/CQ
+
–
Out OK–
Out OK+
+
–
48Q/CQ
L
N
L
N
Sys Out
Sys In
D
LT/UT1740-7DZ
+ –
i
Vo+
Vo–
D set
Fuse
43.2 k
R
ext
+
R
HC+
HC–
–
06083a
Temp. sensor T
i/Vcr
Storing the System Good Signal
For battery back-up systems located in inaccessible areas it
could be of interest to know, whether there has been a Power
Fail (interruption of the mains). To obtain this information, Sys
Out should be connected to Sys In with a reset button
connected to Vo–. In this way a system failure like an
interruption of the mains will be stored at Sys Out until, the
reset button is pressed.
+
–
+
–
48Q/CQ
L
N
L
N
Sys Out
Sys In
LT/UT1740-7DZ
+–
Vo+
Vo–
Fuse
Stored
Sys Out
Reset
R
+
–
HC–
HC+
06084a
Temp. sensor T
i/Vcr
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