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参数资料
| 型号： | LT1240-7DZFB1 |
| 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 |
| 封装： | CASE T01, MODULE |
| 文件页数： | 15/33页 |
| 文件大小： | 864K |
| 代理商： | LT1240-7DZFB1 |
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Cassette Style
AC-DC Converters
T Series
Edition 5/5.2000
22/33
Battery Size and Ripple Current
Some consideration should be given to the selection of the
battery size. According to VDE 0510 part 2, the low fre-
quency ripple current of the floating charge current should
not exceed 5 Arms per 100 Ah capacity (0.05 C). The power
factor corrected single step conversion of the line input volt-
age to the low DC output voltage generates a ripple voltage
at the output of twice the input frequency, causing a ripple
current into the connected battery.
For systems where only a small battery back-up time is re-
quired, battery charging by one T unit may be sufficient (see
also fig. below).
For systems with more than one T unit charging the battery
please refer to the chapter:
Back Plane.
T 1000
Uo: 56.0 V
T 1000
Uo: 56.0 V
T 1700-7D
Uo range
50.5...56.0 V
Battery
+
–
Load
06081
Fig. 41
Alternative configuration for a larger system with a small
battery
If the ripple current is too high e.g. in the case of a smaller
battery to be connected to the system, a large capacitor
with low impedance can be connected in parallel with the
battery. Another possibility is to connect an additional im-
pedance to the battery line, e.g. a choke or an NTC-resistor
(30 A or 60 A chokes are available on request. Please con-
sult Power-One's application center). Further considera-
tions for the selection of battery size include desired back-
up time, required battery life, temperature range and maxi-
mum permissible discharge current. Consult the manufac-
turers of lead-acid batteries for the final selection.
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 bat-
tery cabinets and installation rooms.
Local regulations must be observed. Further information
about designing battery systems is contained in VDE 0510,
part 2.
Combination of T Units and CQ Units without Battery
In a complete power system consisting of two or more T
units in parallel combined with CQ units it may be desirable
to have one common signal indicating the status of the
whole system.
The CQ units provide a galvanically isolated signal Out OK.
To obtain a logic AND all CQ Out OK signals should be con-
nected in series (see also fig.:
Wired AND of galvanically
isolated open collector signals). Out OK– of the first CQ unit
should be connected to Vo–, Out OK+ of the last CQ unit
should be connected to pin Sys In of one of the T units. Sys
Out should be connected to Sys In of the next T unit. If one
of the units fails (T or CQ ) it will be indicated by the overall
System Good (see fig. below).
If in a system with 2 redundant T units Power Down is de-
sired as one common signal, independent of a possible fail-
ure of one of the two T units, simply interconnect the D pins
of the two T units. In this way Power Down only becomes
active if both T units fail which would result in the bus volt-
age falling (see fig. below).
Note: Consider the behaviour of the signalling in a system
with decoupling diodes or fuses in the case of a T-failure,
with the secondary in short circuit.
Fig. 42
Monitoring of overall System Good and Power Bus Down
in a redundant system
+
–
Out OK–
Out OK+
+
–
CQ 1
+
–
Out OK–
Out OK+
+
–
CQ 2
+
–
Out OK–
Out OK+
+
–
CQ 3
P
N
Vo+
Vo–
T
1701
P
N
Vo+
Vo–
P
N
Sys Out
Sys In
D
T
1701
Sys In
D
Overall
System
Good
Power
Down
+
–
R
06082
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1240-7Z | 制造商:POWER-ONE 制造商全称:Power-One 功能描述:500 Watt AC-DC Converters |
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| LT1241CN8 | 功能描述:IC REG CTRLR ISO PWM CM 8-DIP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LT1241CN8#PBF | 功能描述:IC REG CTRLR ISO PWM CM 8-DIP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
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