Benign Environment
AC-DC Converters <40 Watt
LW Series
TOKO 15/30 Watt AC-DC Converters
Input to output isolation
Triple output
• Universal AC input
• Flex power topology
• Noise level meets EN 55011/EN 55022, class B
• Low profile: 25.4 mm
Safety according to IEC/EN 60950
25.4
1.0"
70
2.8"
128
5.0"
LW Series
25.4
1.0"
70
2.8"
175
6.9"
LW 15
LW 30
Summary
Innovative design and attention to detail make the LW se-
ries the choice of many design engineers. These compact
power supplies feature a total volume of nearly three times
less than conventional switchers in the same power range.
MOSFET switching technology and component derating
further assure high reliability. The LW's flex power output
design easily accommodates changing design needs and
power requirements. Universal AC input is standard on all
15 and 30 W rated triple output models. Safety approvals
according to UL 1950, CSA 950 (EB 1420C) and IEC/EN
60950.
Key applications
Equipment for office automation, factory automation, pe-
ripheral, communication, security, display, test and meas-
urement, inspection and medical.
Type Survey and Key Data
Table 1: Type survey
Output 1
1
U
o nom
I
omax
[V DC]
[A]
5
5
5
5
1
2
Output 2
1
U
o nom
I
o max
[V DC]
[A]
12
15
12
15
0.5
0.5
1.2
1.2
Output 3
1
U
o mom
I
o max
[V DC]
[A]
–12
–15
–12
–15
0.5
0.5
0.5
0.5
Output power
T
A
= 40°C
P
o max
[W]
17.5
17.5
31
31
Input voltage
U
i min
…
U
i max
85…264 V AC
47…63 Hz
(110…350 V DC)
Efficiency
2
h
[%]
65
65
65
65
Type
designation
LW 15-01
LW 15-11
LW 30-01
LW 30-11
3.0
3.0
5.0
5.0
The cumulated power of all three outputs may not exceed the total rated power
Efficiency at
U
i rated
and
I
o nom
.
Table of Contents
Page
Page
Electromagnetic Compatibility (EMC) .............................. 5
Immunity to Environmental Conditions ............................. 6
Mechanical Data .............................................................. 7
Safety and Installation Instructions .................................. 8
Accessories ...................................................................... 9
Summary .......................................................................... 1
Type Survey and Key Data .............................................. 1
Type Key .......................................................................... 2
Functional Description ...................................................... 2
Electrical Input Data ......................................................... 3
Electrical Output Data ...................................................... 3
MELCHER
The Power Partners.
Edition 3/4.99
1/9
LW Series
Type Key
Type Key
AC-DC Converters <40 Watt
Benign Environment
LW 15 - 01
Series ........................................................................... LW
Nominal output power [W] ........................................ 15, 30
Output configuration ................................................. 01, 11
Example:
LW 15-01 = AC-DC converter providing 15 W on 3 outputs of 5 V/3A, 12 V/0.5 A and –12 V/0.5 A.
Functional Description
03073
Regulator
V2
L
Fuse
Regulator
Input
filter
Overload
protection
and control
circuit
G2
N
Y
FG
V3
V1
Output voltage
sensing circuit
G1
Y Y Y
FG
Fig. 1
Block diagram LW 15
03074
Regulator
V2
L
G2
Fuse
Input
filter
Regulator
V3
V1
N
Y
FG
Overload
protection
and control
circuit
FG
Y
Output voltage
sensing circuit
Y
G1
Fig. 2
Block diagram LW 30
MELCHER
The Power Partners.
Edition 4/4.99
2/9
Benign Environment
Electrical Input Data
AC-DC Converters <40 Watt
LW Series
General Condition:
T
A
= 25°C unless otherwise specified
Table 2: Input data
Characteristics
LW 15-...
100, 120, 200, 220, 240
85...264
110...350
V DC
Hz
0.85/0.45
30
0.5
mA
A
LW 30-...
Unit
V AC
U
i rated
U
i
Rated input voltage
Input voltage range
f
i
I
i
l
i m
I
i leak
1
Line frequency
Input current
1
Inrush current (max.)
Leakage current (max.)
100/200 V AC
100 V AC
100 V AC
0.45/0.25
47...63
At
U
i rated
and
I
o nom
.
Electrical Output Data
General Condition:
T
A
= 25°C unless otherwise specified
Table 3a: Output data 15 W types
Type
Characteristics
V1
nom.
5
±1
1.25
LW 15-01
V2
12
±4
0.15
V3
–12
±4
0.1
V1
5
±1
1.25
LW 15-11
V2
15
±4
0.15
V3
–15
±4
0.1
Unit
V
%
A
U
o nom
D
U
o
Output voltage
Voltage setting tolerance
set at a load of
Overvoltage protection
Output current
I
o set
U
o P
I
o
Not provided
min.
typ.
max.
0.5
2
3
0
0.3
0.5
0
0.2
0.5
105
17.5
15
max.
100
±2.0
±2.0
6
150
±0.5
±1.0
6
150
±0.5
±0.5
0.3
±1
100
10/20
65
%
ms
15
100
±2.0
±2.0
7.5
150
±0.5
±1.0
7.5
150
±0.5
±0.5
mVpp
%
0.5
2
3
0
0.3
0.5
0
0.2
0.5
A
I
o L
P
o tot
P
o max
u
o
D
U
o U
D
U
o I
D
U
o t
a
Uo
Output current limitation
2
Total output power
Max. power/output
Ripple-noise
1
Line regulation
Load regulation
Drift (t = 0.5...8 h)
Change in temp.
Rise time
1
%
W
85...264 V
0...100%
typ.
0...50°C
max.
t
o r
t
o h min
h
1
2
Hold up time
1
100/200 V AC
Efficiency
1
typ.
At
U
i rated
and
I
o nom
.
Operating at approx. 105% of rated power, constant current method, automatic recovery.
MELCHER
The Power Partners.
Edition 3/4.99
3/9
LW Series
Table 3b: Output data 30 W types
AC-DC Converters <40 Watt
LW 30-01
Benign Environment
LW 30-11
Characteristics
V1
nom.
5
±1
1.85
yes
min.
typ.
max.
1
3
5
V2
12
±4
0.5
-
0
1
1.2
V3
–12
±4
0.5
-
0
0.3
0.5
105
V1
5
±1
1.85
yes
1
3
5
V2
15
±4
0.5
-
0
0.8
1.2
V3
–15
±4
0.5
-
0
0.2
0.5
Unit
V
%
A
U
o nom
D
U
o
Output voltage
I
o set
U
o P
I
o
Voltage setting tolerance
set at a load of
Overvoltage protection
3
Output current
A
I
o L
P
o tot
P
o max
u
o
D
U
o U
D
U
o I
D
U
o t
a
Uo
Output current limitation
2
Rated output power
Max power/output
Ripple-noise
1
Line regulation
Load regulation
Drift (t = 0.5...8 h)
Change in temp.
Rise time
1
max.
85...264 V
0...100%
typ.
0...50°C
max.
tot.
25
100
±2.0
±2.0
14
150
±0.5
±1.0
6
150
±0.5
±0.5
%
W
25
100
±2.0
±2.0
18
150
±0.5
±1.0
7.5
150
±0.5
±0.5
mVpp
%
31
0.3
±1
100
10/20
65
%
ms
t
o r
t
o h
h
1
2
3
Hold up time
1
100/200 V AC
Efficiency
1
typ.
At
U
i rated
and
I
o nom
.
Operating at approx. 105% of rated power, constant current method, automatic recovery.
For V1 only, overall voltage cutoff, recovery at power on.
Input and Output Terminals
Table 4: Input and output terminals
Terminal
L
N
FG
V1
V2
V3
G1, G2
Function
Line input
Neutral input
Explanation
1. Connect to a sine wave 47...63 Hz, 85...264 V AC, single phase.
2. Use a double or triple core cable for the input line.
3. Space the AC input line as far as possible from the DC output line.
Frame ground terminal Connect with low impedance to ground line of equipment on which the power supply is mounted.
Output Terminal 1
Output Terminal 2
Output Terminal 3
Ground Terminals
Stabilized output of 5 V DC
Stabilized output of 12 or 15 V DC
Stabilized output of –12 or –15 V DC
G1: ground terminal for V1, G2: ground terminal for V2 and V3.
G1 and G2 are internally interconnected.
Proper Method of Operation
To achieve the proper output voltage from each of the three
outputs, the individual load currents must remain within the
minimum-maximum ratings. If the load current can drop be-
low the minimum value specified, add a pre-load.
Output Current Limitation
Each output provides its own built-in current limitation at
approx. 105% of the rated currents. In case of overload, the
circuit limits the current. After removal of overload, the cir-
cuit automatically resets.
Inrush Current
All models feature inrush current limitation circuits by
means of power thermistors. Switching the AC input on/off
repeatedly in rapid succession (less than 2 minutes waiting
time) should be avoided. An appropriate AC switch for each
model based on its specifications should be provided.
Series or Parallel Connection
The outputs cannot be operated in series or parallel con-
nection with other type of sources.
MELCHER
The Power Partners.
Edition 4/4.99
4/9
Benign Environment
Thermal Considerations
AC-DC Converters <40 Watt
P
o
/P
o max
1.2
1.0
0.8
0.6
0.4
0.2
0
–10
0
10
20
30
40
50
60
LW Series
The relation between the maximum allowed output power
P
o allwed
, the temperature
T
A
of the surrounding air and the
mounting method is given in the:
Installation Instruction.
The percentage rates apply if the AC-DC converter is lo-
cated in free, quasi-stationary air (convection cooling).
The following figure shows the allowed output power of an
AC-DC converter if mounting method A is used.
For
P
o max
values see:
Type Survey and Key Data.
The ther-
mal conditions are influenced by input voltage, output cur-
rent, airflow and temperature of surrounding components
and surface.
Caution:
The installer must ensure that under all operat-
ing conditions
T
A
remains within the limits stated in the
table.
05118
70
T
A
[°C]
Fig. 3
Output power vs. ambient temperature
Electromagnetic Compatibility (EMC)
Electromagnetic Immunity
A metal oxide VDR together with an input fuse and an input
filter form an effective protection against high input tran-
sient voltages which typically occur in most installations,
but especially in battery driven mobile applications. The
VEW series has been successfully tested to the following
specifications:
Table 5: Immunity type tests
Phenomenon
Electrostatic
discharge
Standard
4
IEC/EN
61000-4-2
Level
x
Coupling
mode
3
air discharge
to frame
antenna in
1 m distance
i/c, +i/–i
Value
applied
6000 V
p
Waveform
1/50 ns
Source
Imped.
330
Ω
Test
procedure
10 positive and
10 negative
discharges
26...1000 MHz
50
Ω
1 min positive
1 min negative
bursts per
coupling mode
5 pos. and 5 neg.
surges per
coupling mode
In
Per-
oper. form.
yes
1
Electromagnetic IEC/EN
field
61000-4-3
Electrical fast
transient/burst
IEC/EN
61000-4-4
x
x
10 V/m
2000 V
p
sine wave mod-
ulated w. 1 Hz
5/50 ns
yes
yes
1
1
Surge
IEC/EN
61000-4-5
x
i/c
2000 V
p
1.2/50
µs
12
Ω
yes
2
1
1
2
3
4
Normal operation, no deviation from specifications.
No load.
i = input, o = output, c = case.
For related and previous standards see:
Technical Information: EMC.
MELCHER
The Power Partners.
Edition 3/4.99
5/9
京公网安备 11010802033920号
EEWORLD
