LS4301-7R POWER-ONE [Power-One], LS4301-7R Datasheet - Page 22

• Manufacturer Part Number: LS4301-7R
• Description: 100 Watt AC-DC Converters with PFC
• Manufacturer: POWER-ONE [Power-One]

Cassette Style
Edition 01/01.2001
E Inrush Current Limitation
The converters may be supplemented by an electronic cir-
cuit (option E, replacing the standard built-in NTC) to
achieve an enhanced inrush current limiting function.
Table 17: Inrush current characteristics with option E
Fig. 31
Option E block diagram
Fig. 32
Inrush current with option E, U
T Current Sharing
This option ensures that the output currents are approxi-
mately shared between all paralleled modules and in-
creases system reliability. To use this facility, simply inter-
connect the T pins of all modules and make sure, that
pin 14, the S– pin (S 4000) or the Vo1– pins (S 5000) are
also connected together. The load leads should have equal
length and cross section to ensure equal voltage drops. Not
more than 5 units should be connected in parallel. If output
voltage adjustment is requested we strongly recommend to
use the R-input instead of option P, as with option P the re-
quired setting accuracy is difficult to achieve. The output
voltages must be individually set prior to paralleling to
within a tolerance of 1...2% or the R pins should be con-
nected together.
Characteristics
U
I
t
Precaution:
Subsequent switch-on cycles at start-up are limited to
max. 10 cycles during the first 20 seconds (cold unit)
and at continuing on/off ( T
8 sec.
inr p
inr
–10
i
20
15
10
–5
= 230 V AC
5
0
I
i
[A]
Rectifier
0
Peak inrush current
Inrush current duration
10
20
30
R
t
S
inr
Control
Capacitor C
fully charged
40
C
Normal operation
(FET fully conducting)
= 95 C) max. 1 cycle every
i
R
= 230 V AC, P
FET
50
I
typ
35
–
60
i
LS
100 Watt AC-DC Converters
70
max
25.3
50
o
80
C
= P
i
o nom
t [ms]
11002
Unit
ms
A
Fig. 33
An example of poor wiring for connection in parallel
1
2
3
Fig. 34
Paralleling of single output units using option T with the
sense lines connected at the load
Fig. 35
Paralleling of double output units using option T with
Power bus.
max. 5 units in parallel connection
Leads should have equal length and cross sections and should
run in the same cable loom.
Diodes recommended in redundant operation only
DC common point
max. 5 units connected in parallel
N
N
P
P
LS 4000
LS 4000
Module
Module
Vo+
Vo–
Vo+
Vo–
Vo+
Vo–
11003
Vo+
S+
T
S–
Vo–
Vo+
S+
T
S–
Vo–
Vo2+
Vo2–
T
Vo1+
Vo1–
Vo2+
Vo2–
T
Vo1+
Vo1–
2
2
Load
1
1
1
1
Power bus
+
S Series PFC
Load
11011
–
3
3
11037
Load
22/27