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T Series Data Sheet
?
General conditions:
? T A = 20 °C, unless specified.
? V i = 230 VAC, f i = 50 Hz
Table 5: Output data of battery charger versions
500 Watt AC-DC Converters
Output
LT/UT1240-7Z
LT/UT1740-7Z
LT1840-7Z
Unit
Characteristic
Conditions
min
typ max min
typ max min
typ max
V o set
Output voltage adjustment 6
V i nom
27.25
54.5
40.88
V
V o set tol
V o setting tolerance
4
I o = 0.5 ? I o nom
27.2
27.3 54.45
54.55 40.83
40.93
V o
Output voltage range 1
25.25
28.25 50.5
56.5
37.9
42.4
V o
Output voltage over input
voltage and load 1
LT
UT
V i min – V i max , 26.8
(0.01 – 1) ? I o nom
26.9
27.6
27.6
53.8
53.8
55
56.6
40.3
41.3
V o L
Overvoltage protection by second control loop
32.5
59.3
48.4
α Vo
I o nom
I o L
Temperature coefficient of output voltage
Nominal output current
Current limit 2
–3
14.5
20
–3
10
14.5
–3
11
16
mV/K
A
P o L
Output power limit 2
V i nom
400
550
450
W
v o
Output voltage noise
Low frequency
I o nom
700
1000
850
mV pp
Switching freq.
Total
IEC/EN 61204
BW = 20 MHz
40
750
40
1000
40
900
? V o I
? V o V
Static load regulation (droop) 1
Static line regulation 1
(0.01 – 1) ? I o nom
V i min – V i max ,
– 0.4
0.2
– 0.6
0.35
– 0.6
0.25
V
I o nom
V o d
Dynamic load regulation 3
Voltage deviation V i nom
1.6
2.0
2.5
t d
C o
Internal output capacitance
Recovery time
0.1? I o nom ? I o nom
IEC/EN 61204 5
0.2
86
0.2
41
0.2
49
s
mF
1
2
3
4
5
6
V o decreases with rising output current due to the droop characterstic to ease current sharing; see fig. 8.
Due to the large output capacitance, the maximum transient value can be much higher.
Deviation limited by output overvoltage protection
Defined by temperature sensor, by remote control, and by voltage selector switch
See fig. Dynamic load regulation .
Output voltage adjustment with V cr = 9.5 V (2.27 V/cell)
output
voltage
output
power
output
current
Output Characteristic
The models T1701/1702 and the battery chargers T1240/
1740/1840 can be operated in 3 different modes:
– Output voltage regulation
– Output power limitation
– Output current limitation.
Caution: In output power or current limitation mode, the max.
ambient temperature T A should not exceed 65 °C with free air
convection cooling.
The output of all models is fully protected against continuous
short circuit. The maximum constant current is limited to I o L
(see table Electrical output data ). As the LEDs indicating the
V o [V]
60
50
40
30
20
10
regulation
V i = 110 V
V i = 100 V
V i = 90 V
limitation limitation
V i = 230 V
system status are driven from the output voltage, all LEDs
switch off in the case of a short circuit.
0
0
2
4
6
8
10
12
14
16
I o [A]
Fig. 6
Output characteristics LT1701-7 and LT1740-7Z
BCD20023 Rev AB, 02-Nov-2010
Page 7 of 31
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