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参数资料
| 型号： | LT1240-7DF |
| 厂商： | POWER-ONE INC |
| 元件分类： | 电源模块 |
| 英文描述： | 1-OUTPUT 400 W AC-DC REG PWR SUPPLY MODULE |
| 封装： | CASE T01, MODULE |
| 文件页数： | 4/33页 |
| 文件大小： | 838K |
| 代理商： | LT1240-7DF |
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T Series
AC-DC Converters >100 Watt
Rugged Environment
Edition 4/4.99
12/33
MELCHER
The Power Partners.
Fig. 19
Dynamic characteristics under varying load conditions
(see Electrical output data) without battery back-up.
Uo
t d
DUo I
10%
DUo d
t
Io /Io nom
1
0.9
0.1
DUod
05051
Uo
Dynamic output characteristic
Output Overvoltage Protection (Battery Charger
Version)
A slight output voltage overshoot may occur at turn on, in-
hibit release or during fast load changes. A second inde-
pendent control loop interrupts operation above
Uo L, indi-
cated by the red LED. The output voltage remains below
60 V (SELV) under all operating conditions.
Note: There is no specific built-in protection against ex-
ternally applied overvoltages or transient sources like
e.g. motors. Never apply voltages exceeding
Uo L to the
output. Otherwise the unit may be damaged.
Important: Setting the switch to the correct battery cell
voltage is vital for the proper operation of a battery sys-
tem. Check whether the switch position corresponds to
the required battery cell voltage prior to putting a system
into operation.
Note: Switching to a different cell voltage while the T unit is
in operation may cause a small and short distortion of the
output voltage.
Control Features of the Battery Charger Version
2.23 V
2.24 V
2.25 V
2.26 V
2.27 V
2.28 V
2.29 V
2.30 V
2.31 V
2.32 V
2.35 V
0
4
8
C
06068
Fig. 20
Cell voltage selector switch
Cell voltage selector switch Z
The standard units T xx40-7Z are equipped with the cell
voltage selector switch at the rear side of the unit, which
provides an easy way of external adjustment to the recom-
mended float charge voltage for specific battery types.
Each switch position allows a step in the output voltage of
10 mV/cell whereby the switch position "0" represents a cell
voltage of 2.23 V at 20
°C and the switch position "C" gives
2.35 V per cell.
The cell voltage selector switch fits together with the
Melcher 2.23 V temperature sensor. The float charge volt-
age is set by the switch and the temperature coefficient is
specified by the sensor type.
According to the recommendations of battery manufactur-
ers, the float charge voltage of a lead acid battery should be
temperature compensated. Depending upon the battery
type and size, charging with different temperature coeffi-
cients may be required. An excessive float charge voltage
may damage the battery through overcharging.
Most lead acid battery manufacturers recommend cell volt-
ages between 2.23 V and 2.32 V with the nominal cell volt-
age defined at 20
°C and temperature coefficients between
–3 and –4 mV/K/cell.
The value of the negative temperature coefficient, is speci-
fied by the temperature sensor.
With the cell voltage selector switch Z the required cell volt-
age can be adjusted at the rear of the unit, making the sys-
tem flexible to different float charge voltages of battery sys-
tems.
Where the selector switch Z is not applicable, a cell voltage
adjustment can also be provided via the temperature sen-
sor (see:
Temperature Sensor).
Although it is not recommended, the output voltage can be
set to a fixed value without temperature compensation by
an external voltage source or a resistive voltage divider at
the remote control input (e.g. if the battery temperature
shall be controlled by other systems, see:
Output voltage
control via Inhibit/Ucr remote control input).
What needs to be considered with all battery charger types:
The final float charge voltage is only reached with a fully
loaded battery. Since new batteries directly supplied from
the manufacturer are only charged to 70...80% of their ca-
pacity, the battery system should be operated for min. 72 h
prior to checking the float charge voltage.
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相关代理商/技术参数 |
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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) |
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