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T Series Data Sheet
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Table 9: Characteristics of the inhibit signal
500 Watt AC-DC Converters
Characteristics
Conditions
min
typ
max
Unit
V inh
R inh
V inh
R inh
Inhibit voltage
Resistance to Vo-
Inhibit voltage
Resistance to Vo-
V o = on
V o = on
V o = off
VU o = off
V i min – V i max ,
T C min – T C max
2.5
30 k
– 0.7
60
0.4
50
V
?
V
?
t r
P inh
Switch on time until full power available
Input power at inhibited converter
V i nom
V i nom
100
3
ms
W
V o [V]
T1240
T1840 T1740
06069a
V cr = V o – 45 V
(T1740)
28.25
42.37
56.5
V cr = 4 / 3 ? V o – 33.7 V
V cr = 2 ? V o – 45 V
(T1840)
(T1240)
––-–-–--–– > 35 k ?
27
26
25.25
41
39
37.85
55
54
53
52
50.5
V cr
V o ? R 2
V cr = ––––––––
( R 1 + R 2 )
R 2 : Value with 1 MW internal resistance in parallel with R.
It is mandatory that:
( R 1 ? R 2 )
( R 1 + R 2 )
otherwise the converter might not be able to start.
Control by an external voltage source
3 4
5 5.5
11.5 14
16 V
Logic level of
the signal
05062a
System Good
Fig. 16
5.3 V
14 V
V cr
i/Vcr
Vo–
28
22
V cr
+
–
Ext. voltage
source
5.5 – 11.5 V
Output voltage V o versus control voltage V cr , with the
corresponding signal System Good
If the voltage selector switch Z is not set at 2.23 V per cell, the V cr
fail voltage rises accordingly.
The inhibit input of battery charger models is not TTL/CMOS
compatible and should be triggered by a switch, a relay, or an
open-collector transistor.
Control by external resistors
With a resistive potential divider or a potentiometer connected
to the remote control input, a fixed output voltage can be
programmed:
05063a
Fig. 18
Voltage setting by an external voltage source
Control by the temperature sensor T
The temperature sensor provides a temperature-compensated
charging process for lead-acid batteries; see Accessories,
Temperature Sensor T .
Vo+
i/Vcr
12
28
R 1
V o +
1 M ?
Vo–
V cr R
22
R 2 = 1 M ? ? R /(1 M ? + R )
V o –
Fig. 17
Voltage setting by external resistors
BCD20023 Rev AB, 02-Nov-2010
Page 12 of 31
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