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参数资料
| 型号： | LT1702-7D |
| 厂商： | POWER-ONE INC |
| 元件分类： | 电源模块 |
| 英文描述： | 1-OUTPUT 550 W AC-DC REG PWR SUPPLY MODULE |
| 封装： | CASE T01, MODULE |
| 文件页数： | 5/33页 |
| 文件大小： | 838K |
| 代理商： | LT1702-7D |
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Rugged Environment
AC-DC Converters >100 Watt
T Series
Edition 4/4.99
13/33
MELCHER
The Power Partners.
The Inhibit/Ucr remote control input at connector pin 28 pro-
vides two functions:
– External adjustment of the output voltage
– Inhibiting of the unit
A voltage
<0.4 V inhibits the output, a voltage >2.5 V ena-
bles it.
By the Ucr remote control input range of 5.5 V
< U cr
< 11.5 V, the output voltage U
o set can be adjusted within a
range of +3.6% to –7.9%. This feature is optimized to con-
trol the float charge of lead acid batteries.
Outside of the control range, the sensor monitoring circuit
generates a system error signal (see also:
System Good).
In the case of a excessively high control voltage, the output
is reduced.
The remote control input is protected against DC overvolt-
age up to 60 V .
50.5
52
53
54
55
56.5
Uo [V]
3
4
5 5.5
11.5
14
16 Ucr [V]
Logic level of
System
Good
signal
Signal high
Signal low
37.85
39
41
42.37
25.25
26
27
28.25
06069
T 1240 T 1840 T 1740
Ucr [V]
5.3 V
14 V
Fig. 21
Output voltage Uo versus control voltage Ucr, with corre-
sponding system good signal level
Output voltage control via Inhibit/Ucr remote control input.
Table 8: Characteristics of the inhibit signal
Characteristics
Conditions
min
typ
max
Unit
Uinh
Inhibit voltage
Uo = on
Ui min...Ui max
2.5
60
V
Rinh
Resistance to Vo-
Uo = on
TC min...TC max
30 k
Uinh
Inhibit voltage
Uo = off
– 0.7
0.4
V
Rinh
Resistance to Vo-
Uo = off
50
tr
Switch on time until full power available
Uinom
100
ms
Pinh
Input power at inhibited unit
Uinom
3W
Table 9: Characteristics of the remote control
Characteristics
Conditions
LT/UT 1240
LT 1840
LT/UT 1740
Unit
typ
Uo
Output voltage at:
Voltage selector
25.25
37.85
50.5
V
Ucr fail 2.5...5.5 V
switch Z set at
Ucr control 5.5...11.5 V
2.23 V/cell or without
22.5 +
Ucr 0.5
33.75 +
Ucr 0.75
45 +
Ucr
Ucr clamp 11.5...14 V
selector switch
28.25
42.37
56.5
Ucr fail 14...60 V
Ui nom
25.25
37.85
50.5
Rcr
Input impedance
0.5
Io nom
11
1
M
fcr
Frequency limit
1
Hz
Potentiometer for fine tuning
T units are fitted with a one-turn potentiometer for fine tun-
ing of the output voltage to within
±3.70/00 of U
o. The
potentiometer is protected by a plastic cover. To adjust the
output voltage for improved current sharing or compensa-
tion for voltage drops over the load lines, each of the T units
in a system should be unplugged and adjusted individually
to the same output voltage at equal load; otherwise current
sharing may adversely be affected.
Note: An open inhibit/Ucr remote control input leads to a
sensor error signal which is indicated by the Error LED at
the front and high impedance of the "System good" signal.
The output voltage is reduced to
Ucr fail condition.
If the voltage selector switch Z is not set at 2.23 V per cell,
the
Ucr fail voltage rises accordingly.
The inhibit input of the T xx40-7Z is not TTL/CMOS compat-
ible and should be triggered by a switch, a relay or an open
collector transistor.
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