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K Series with PFC Data Sheet
150 – 280 Watt AC-DC Converters
Note: Subsequent switch-on cycles at start-up are limited to
max. 10 cycles during the first 20 seconds (cold converter)
and then to max. 1 cycle every 8 s.
Table 20: Inrush current characteristics with option E
(pin 14: S – or Vo1–), are also connected together. The
load lines should have equal length and cross section to
ensure equal voltage drops.
Not more than 5 converters should be connected in parallel.
The R pins should be left open-circuit. If not, the output
Characteristics
V i = 230 VAC
all models
typ max
Unit
voltages must be individually adjusted prior to paralleling
within 1 to 2% or the R pins should be connected together.
I inr p
t inr
Peak inrush current
Inrush current duration
–
35
25.3
50
A
ms
Parallel connection of converters with option P is not recom-
mended.
11036b
Vo+
1
2
I i [A]
11002b
S+
20
Capacitor C i
fully charged
Converter
T
S–
1
15
Vo–
10
5
Normal operation
(FET fully conducting)
Vo+
2
Load
0
S+
–5
Converter
T
S–
1
–10
t inr
t
Vo–
1
0
10
20
30
40
50
60
70
80 ms
Max. 5 converters in parallel connection
Fig. 34
Typ. inrush current with option E
V i = 230 VAC, f i = 50 Hz, P o = P o nom
P Potentiometer
A potentiometer provides an output voltage adjustment
range of +10/ –60% of V o nom . It is accessible through a hole
1 Lead lines should have equal length and cross
section, and should run in the same cable loom.
2 Diodes recommended in redundant operation only
Fig. 36
Paralleling of single-output models using option T with
the sense lines connected at the load
Power bus
in the front cover. Option P is not available for battery
charger models and is not recommended for converters
connected in parallel.
Option P excludes the R-function. With double-output
models, both outputs are influenced by the potentiometer
setting (doubling the voltage, if the outputs are in series).
If the output voltages are increased above V o nom via R input
11037b
Converter
Vo2+
Vo2–
T
Vo1+
Vo1–
+ –
control, option P setting, remote sensing, or option T, the
output current(s) should be reduced accordingly, so that
P o nom is not exceeded.
Vo2+
Load
T Current Sharing
Vo+
Vo–
11003a
Load
Converter
Vo2–
T
This option ensures that the
output currents are approx-
imately shared between all
parallel-connected convert-
ers, hence increasing sys-
tem reliability. To use this
facility, simply interconnect
the T pins of all converters
and make sure that the
reference for the T signal
Vo+
Vo–
Vo+
Vo–
Fig.35
Example of poor wiring
for connection in parallel
Vo1+
Vo1–
Max. 5 converters in parallel connection
Fig. 37
Paralleling of double-output models with the outputs
connected in series, and using option T with power bus.
The signal at the T pins is referenced to Vo1–.
BCD20001-G Rev AC, 16-Dec-2010
Page 23 of 29
www.power-one.com
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