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W Series Data Sheet
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125, 250 Watt AC-DC and DC-DC DIN-Rail Converters
Output Power Derating
The output power of LW models must be decreased at low
input voltage and/or powertrain temperature above 125 °C.
The powertrain temperature depends on the output power, the
input voltage, and the cooling method. At low input voltage the
losses increase. At the maximum specified environment
temperature T A free air convection cooling might be insufficient
approaching maximum ambient conditions. As a result, the
Note: The measurements have been made by the approval
boards with free air convection cooling according to UL 60950
specified ambient temperature T A and with the converter built in a
cardboard box according to UL 508 and a specified temperature
outside the box T out . The tables give a correlation between T A or
T out and the case temperature T C (measuring point T C see
Mechanical Data ). For models not specified, please contact
Power-One.
EW models have no derating.
output power has to be reduced according to the tables below.
Table 5a: P o derating according to UL 60950 at T A = 60 °C, or according to UL 508 at T out = 50 °C
Model
P o nom
T C max
Derate below
derate by
[W]
[°C]
V i [VAC]
V i [VDC]
[W/V]
LWR1601-6E
LWN1601/2660-6E
LWR1701-6E
LWN1701-6E
LWR1801-6E
LWN1801/2880-6E
124
247
122
244
124
247
80
89
80
90
80
89
108
125
125
125
98
125
98
115
115
115
93
115
–0.67
–1.25
–1.25
–1.25
– 0.67
–1.25
Table 5b: P o derating according to UL 60950 at T A = 50 °C, or according to UL 508 at T out = 40 °C
Model
P o nom
T C max
Derate below
derate by
[W]
[°C]
V i [VAC]
V i [VDC]
[W/V]
LWR1601-6E
LWN1601/2660-6E
LWR1801-6E
LWN1801/2880-6E
124
247
124
247
76
86
76
86
98
115
93
105
no derating
105
no derating
95
–0.67
–1.25
–0.67
–1.25
Input Fuse and Protection
A fast-blow fuse ( Schurter F 6.3 A, 5 × 20 mm), protected by a
sleeve, is connected to the input L or Vi+. EW models have a
smaller fuse (250 V, 4 × 9 mm, SOC NT3 6.3A V009, UL-
recognized E-39265). For DC input voltages above 250 V
consult the Installation Instructions .
Converters with option F have 2 small fuses, one in each input
Efficiency
90
80
04071
line. Converters with option EF (E and F) have 2 large fuses
( F6.3 A, 5 × 20 mm). The DC input voltage for converters with
option F is limited to 250 V.
A VDR and a symmetrical input filter form an effective
protection against input transients.
An under- and an overvoltage lockout protect the converter,
which is disabled below V i min and above V i max by an internally
generated inhibit signal.
The built-in bridge rectifier (LW models) provides reverse
polarity protection at the input if operated from DC.
EW models are protected by the (blowing) input fuse in
70
60
50
40
30
20
10
0
0
0.2 0.4
V i = 125 VAC
0.6
I o
0.8 1 I o nom
V i = 230 VAC
connection with the body diode of the main transistor. Option Q
offers a serial diode, but this reduces the efficiency by approx.
1%.
Fig. 3
Efficiency versus load (LWN2660-6)
BCD20020-G Rev AC, 31-Jan-2013
Page 7 of 25
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