K Series Data Sheet
150 Watt DC-DC and AC-DC Converters
Features
• RoHS lead-free-solder and lead-solder-exempted
products are available.
• Compliant with EN 50155, EN 50121-3-2, EN 45545.
• Class I equipment
• Extremly wide input voltage ranges from 8 to 385 VDC,
and 85 to 264 VAC, 47 to 440 Hz
• Input over- and undervoltage lockout
• Adjustable output voltage with remote on/off
• 1 or 2 outputs: SELV, no load, overload, and short-
circuit proof
• Rectangular current limiting characteristic
• PCBs protected by lacquer
• Very high reliability
Safety-approved according to IEC/EN 60950-1, UL/CSA
60950-1 2
nd
Ed.
111
4.4"
3U
80
3.2"
16 TE
168
6.6"
Description
The K Series of DC-DC and AC-DC converters represents a
broad and flexible range of power supplies for use in advanced
electronic systems. Features include high efficiency, high
reliability, low output voltage noise and excellent dynamic
response to load/line changes. LK models can be powered by
DC or AC with a wide-input frequency range (without PFC).
The converter inputs are protected against surges and
transients. An input over- and undervoltage lockout circuitry
disables the outputs, if the input voltage is outside of the
specified range. Certain types include an inrush current limiter
preventing circuit breakers and fuses from tripping at switch-
on.
All outputs are open- and short-circuit proof, and are protected
against overvoltages by means of built-in suppressor diodes.
The output can be inhibited by a logic signal applied to pin 18
(i). The inhibit function is not used, pin 18 must be connected
with pin 14 to enable the outputs.
LED indicators display the status of the converter and allow for
visual monitoring of the system at any time.
Full input-to-output, input-to-case, output-to-case, and output
to output isolation is provided. The converters are designed,
built, and safety-approved to the international safety standards
IEC/EN 60950-1. They are particulary suitable for railway
applications and comply with EN 50155 and EN 50121-3-2.
The case design allows operation at nominal load up to 71 °C
with natural cooling. If forced cooling is provided, the ambient
temperature may exceed 71 °C, but the case temperature
must remain below 95 °C.
A temperature sensor generates an inhibit signal, which
disables the outputs when the case temperature
T
C
exceeds
the limit. The outputs are automatically re-enabled, when the
temperature drops below the limit.
Various options are available to adapt the converters to
individual applications.
The converters may either be plugged into a 19 " DIN-rack
system according to IEC 60297-3, or be chassis mounted.
Important:
For applications requiring compliance with IEC/EN
61000-3-2 (harmonic distortion), please use our LK4000 or
LK5000 Series with incorporated power factor correction (PFC).
Table of Contents
Page
Page
Electromagnetic Compatibility (EMC) .............................. 15
Immunity to Environmental Conditions ............................ 17
Mechanical Data ............................................................... 18
Safety and Installation Instructions .................................. 20
Description of Options ..................................................... 23
Accessories ...................................................................... 30
Page 1 of 31
Description ......................................................................... 1
Model Selection .................................................................. 2
Functional Description ....................................................... 4
Electrical Input Data ........................................................... 5
Electrical Output Data ......................................................... 8
Auxiliary Functions ............................................................ 12
BCD20002-G Rev AC, 31-Jan-2014
MELCHER
The Power Partners.
K Series Data Sheet
150 Watt DC-DC and AC-DC Converters
Model Selection
Non-standard input/output configurations or special customer adaptations are available on request.
Table 1a: Models AK
Output 1
V
o nom
I
o nom
[VDC]
[A]
5.1
12
15
24
12
15
24
20
10
8
5
5
4
2.5
Output 2
V
o nom
I
o nom
[VDC]
[A]
–
–
–
–
12
3
15
3
24
3
–
–
–
–
5
4
2.5
Input Voltage
V
i min
–
V
i max
8 – 35 VDC
AK1001-9R
AK1301-9R
AK1501-9R
AK1601-9R
AK2320-9R
AK2540-9R
AK2660-9R
Effic.
1
η
min
[%]
78
80
82
84
78
80
79
Options
-7, P, D, V
2
, T, B, B1, G
-7, P, D, T, B, B1, G
Table 1b: Models BK, FK, CK
Output 1
V
o nom
I
o nom
[VDC]
[A]
5.1
12
15
24
12
15
24
25
12
10
6
6
5
3
Output 2
V
o nom
I
o nom
[VDC]
[A]
–
–
–
–
12
3
15
3
24
3
–
–
–
–
6
5
3
Input Voltage
V
i min
–
V
i max
14 – 70 VDC
BK1001-9R
BK1301-9R
BK1501-9R
BK1601-9R
BK2320-9R
BK2540-9R
BK2660-9R
Effic.
1
Input Voltage
V
i min
–
V
i max
η
min
[%]
20 – 100 VDC
80
82
84
85
80
82
82
FK1001-9R
FK1301-9R
FK1501-9R
FK1601-9R
FK2320-9R
FK2540-9R
FK2660-9R
Effic.
1
η
min
[%]
80
82
85
86
81
83
84
Input Voltage
V
i min
–
V
i max
28 – 140 VDC
CK1001-9ER
CK1301-9ER
CK1501-9ER
CK1601-9ER
CK2320-9ER
CK2540-9ER
CK2660-9ER
Effic.
1
η
min
[%]
80
82
85
86
81
84
84
Options
-7
4
, P, D, V
2
, K
7
, T,
B, B1, G
-7
4
, P, D, T,
B, B1, G
Table 1c: Models DK, EK, LK
Output 1
V
o nom
I
o nom
[VDC]
[A]
5.1
12
12.84
5
15
24
12
15
24
25.68
6
1
2
3
4
5
6
7
Output 2
V
o nom
I
o nom
[VDC]
[A]
–
–
–
–
–
12
3
15
3
24
3
25.68
3
–
–
–
–
–
6
5
3
2.5
Input Voltage
V
i min
–
V
i max
44 – 220 VDC
DK1001-9ER
DK1301-9ER
DK1740-9ER
5
DK1501-9ER
DK1601-9ER
DK2320-9ER
DK2540-9ER
DK2660-9ER
DK2740-9ER
6
Effic.
1
Input Voltage
V
i min
–
V
i max
η
min
[%] 67 – 385 VDC
80
83
83
85
86
81
83
84
84
---
EK1301-9ER
---
EK1501-9ER
EK1601-9ER
EK2320-9ER
EK2540-9ER
EK2660-9ER
---
Effic.
1
Input Voltage Effic.
1
V
i min
–
V
i max
η
min
η
min
[%]
88 – 372 VDC
[%]
100 – 240 VAC
--
83
--
84
86
82
83
84
--
LK1001-9ER
LK1301-9ER
LK1740-9ER
5
LK1501-9ER
LK1601-9ER
LK2320-9ER
LK2540-9ER
LK2660-9ER
LK2740-9ER
6
79
83
83
84
85
81
83
82
83
Options
25
12
10
10
6
6
5
3
2.5
-7
4
, P, D, V
2
, K
7
, T,
B, B1, G
-7
4
, P, D, T
B, B1, G
6
Min. efficiency at
V
i nom
,
I
o nom
and
T
A
= 25 °C. Typical values are approximately 2% better.
Option V for models with 5.1 V outputs; excludes option D
Second output semi-regulated
AK, BK, FK models are available as -7 or -9, but without opt. E. The other models CK, DK, EK, LK are available as -7 or -9E (but not -7E).
Battery loader for 12 V batteries.
V
o
is controlled by the battery temperature sensor (see
Accessories)
within 12.62 – 14.12 V. Options
P and D are not available.
Battery loader for 24 V (and 48 V batteries with series-connected outputs).
V
o
is controlled by the battery temperature sensor (see
Accessories)
within 25.25 – 28.25 V (50.5 – 56.5 V for 48 V batteries). Options P and D are not available.
Option K is available only for 5.1 V output in order to avoid the connector with high current contacts. Efficiency is approx. 1.5% worse.
NFND: Not for new designs
Preferred for new designs
BCD20002-G Rev AC, 31-Jan-2014
MELCHER
The Power Partners.
Page 2 of 31
K Series Data Sheet
150 Watt DC-DC and AC-DC Converters
Part Number Description
Operating input voltage
V
i
:
8 – 35 VDC
................................................................
AK
14 – 70 VDC
..............................................................
BK
20 – 100 VDC
............................................................
FK
28 – 140 VDC
...........................................................
CK
44 – 220 VDC
..........................................................
DK
67 – 385 VDC
...........................................................
EK
100 – 240 VAC (rated voltage) or 88 – 372 VDC
......
LK
Number of outputs ......................................................... 1, 2
Nominal voltage of output 1 (main output)
V
o1 nom
5.1 V ..................................................................... 0, 1, 2
12 V ............................................................................ 3
15 V ........................................................................ 4, 5
24 V ............................................................................ 6
Other voltages
1
....................................................... 7, 8
Nominal voltage of output 2
V
o2 nom
None (single-output models) .................................... 01
12 V, 12 V ................................................................... 20
15 V, 15 V ................................................................... 40
24 V, 24 V ................................................................... 60
Other specifications or additional features
1
..... 21 – 99
Operational ambient temperature range
T
A
:
–25 to 71 °C ............................................................... -7
– 40 to 71 °C ............................................................... -9
Other
1
............................................................... -0, -5, -6
Auxiliary functions and options:
Inrush current limitation ............................................ E
2
Output voltage control input ....................................... R
3
Potentiometer (output voltage adjustment) .............. P
3
V
i
/
V
o
monitor (D0 – DD, to be specified
1
) ............... D
4
ACFAIL signal ............................................................ V
4
Current share control .................................................. T
H15 standard connector for 5.1 V output models ..... K
5
Cooling plate standard case ............................ B or B1
Cooling plate for long case 220 mm
1
.................... B2
1
RoHS-compliant for all 6 substances
6 ..............................
G
6
1
2
3
4
5
6
CK 2 5 40 -9 E R D3 T B1 G
Customer-specific models
Option E is mandatory for all -9 models, except AK, BK, FK.
Feature R excludes option P and vice versa. Option P is not available for battery charger models.
Option D excludes option V and vice versa; option V is available for single-output models with 5.1 V only.
Option K is available for single-output models with 5.1 V output to avoid the expensive H15-S4 connector.
G is always placed at the end of the part number; preferred for new designs.
Note:
The sequence of options must follow the order above.
Example: CK2540-9ERD3T B1G: DC-DC converter, operating input voltage range 28 – 140 VDC, 2 electrically isolated
outputs, each providing 15 V, 5 A, input current limiter E, control input R to adjust the output voltages, undervoltage
monitor D3, current share feature T, cooling plate B1, and RoHS-compliant for all six substances.
Product Marking
Basic type designation, applicable approval marks, CE mark,
warnings, pin designation, patents and company logo,
identification of LEDs, test sockets, and potentiometer.
Specific type designation, input voltage range, nominal output
voltages and currents, degree of protection, batch no., serial
no., and data code including production site, modification
status (version), and date of production.
BCD20002-G Rev AC, 31-Jan-2014
MELCHER
The Power Partners.
Page 3 of 31
K Series Data Sheet
150 Watt DC-DC and AC-DC Converters
Functional Description
The input voltage is fed via an input fuse, an input filter, a
bridge rectifier (LK models only), and an inrush current limiter
to the input capacitor. This capacitor sources a single-
transistor forward converter with a special clamping circuit
and provides also the power during the hold-up time.
Each output is powered by a separate secondary winding of
the main transformer. The resultant voltages are rectified and
their ripple smoothed by a power choke and an output filter.
The control logic senses the main output voltage
V
o1
and
generates, with respect to the maximum admissible output
currents, the control signal for the switching transistor of the
forward converter.
The second output of double-output models is tracking the
main output, but has its own current limiting circuit. If the main
output voltage drops due to current limitation, the second
output voltage will fall as well and vice versa.
Standard models with a single 5.1 V output have a syn-
chronous rectifier to provide good efficiency.
03057b
N
4
26
Vi+
28
Input filter
1
Opt. P
C
Y
4
2
16 R
18 i
20 D/V
C
i
+
Control circuit
22 T
12 S+
4
Output
filter
Bridge
rectifier
4
Forward converter
(approx. 120 kHz)
C
Y
Vo+
6
8
Vo–
10
Fuse
C
Y
3
L
4
30
Vi– 32
24
C
Y
14 S–
Fig. 1
Block diagram of single-output converters
1
2
3
4
–
+
Transient suppressor (VDR)
Suppressor diode (AK, BK, FK models)
Inrush current limiter (NTC, only for models with
T
A min
= –25 °C ) or option E (for CK, DK, EK, LK models only)
LK models only
03058b
Opt. P
N
4
16 R
18 i
20 D
26
Vi+ 28
C
Y
4
2
Input filter
1
Forward converter
(approx. 120 kHz)
C
Y
Control circuit
C
i
+
22 T
Bridge
rectifier
4
Output 1
filter
12 Vo1+
14 Vo1–
4
Vo2+
Fuse
C
Y
C
Y
3
L
4
Vi–
30
32
C
Y
C
Y
Output 2
filter
6
8
10
Vo2–
24
Fig. 2
Block diagram of double-output models
1
2
3
4
–
+
Transient suppressor (VDR)
Suppressor diode (AK, BK, FK models)
Inrush current limiter (NTC, only for models with
T
A min
= –25 °C ) or option E (for CK, DK, EK, LK models only)
LK models only
BCD20002-G Rev AC, 31-Jan-2014
MELCHER
The Power Partners.
Page 4 of 31
K Series Data Sheet
150 Watt DC-DC and AC-DC Converters
Electrical Input Data
General Conditions
–
T
A
= 25°C, unless
T
C
is specified.
– Pin 18 connected to pin 14,
V
o
adjusted to
V
o nom
(if option P); R input not connected.
– Sense line pins S+ and S– connected to Vo+ and Vo– respectively.
Table 2a: Input data
Input
Characteristics
V
i
V
i nom
I
i
P
i 0
P
i inh
R
i
R
NTC
C
i
V
i RFI
V
i abs
Operating input voltage
Nominal input voltage
Input current
No-load input power
Idle input power
Input resistance
NTC resistance
2
Input capacitance
Conducted input RFI
Radiated input RFI
Input voltage limits
without damage
EN 55022
V
i nom
,
I
o nom
0
832
Conditions
I
o
= 0 –
I
o nom
T
C min
–T
C max
V
i nom
,
I
o nom 1
V
i min
–
V
i max
unit inhibited
T
C
= 25 °C
65
no NTC
1040
A
A
40
0
300
min
8
15
9.0
2.5
1.5
100
no NTC
370
A
A
84
0
AK
typ
max
35
min
14
30
6.0
2.5
1.5
70
no NTC
1200 1500
B
A
100
VDC
µF
BK
typ
max
70
min
20
50
3.75
2.5
1.5
mΩ
A
W
FK
typ
max
100
VDC
Unit
Table 2b: Input data
Input
Characteristics
V
i
V
i nom
I
i
P
i 0
P
i inh
R
i
R
NTC
C
i
V
i RFI
V
i abs
1
2
3
4
CK
Conditions
min
28
60
V
i nom
,
I
o nom 1
V
i min
–
V
i max
unit inhibited
T
C
= 25 °C
150
1000
960
EN 55022
V
i nom
,
I
o nom
0
1200
B
A
154
0
264
3.0
2.5
1.5
170
typ
max min
140
44
Operating input voltage
I
o
= 0 –
I
o nom
T
C min
–
T
C max
Nominal input voltage
Input current
No-load input power
Idle input power
Input resistance
NTC resistance
2
Input capacitance
Conducted input RFI
Radiated input RFI
Input voltage limits
without damage
DK
typ
max
220
110
1.6
2.5
1.5
180
2000
330
B
A
400
3
0
216
min
67
EK
typ
max min
385
220
0.8
2.5
1.5
480
4000
270
B
A
400
–400
216
88
85
4
LK
typ
max
372
(230) 264
4
310
4
0.57
2.5
4.5
Unit
VDC
VAC
VDC
A
W
mΩ
4000
270
B
A
400
VDC
µF
Both outputs of double-output models are loaded with
I
o nom
.
Valid for -7 versions without option E (-9 versions exclude NTC). This is the nominal value at 25 °C and applies to cold converters at initial
switch-on cycle. Subsequent switch-on/off cycles increase the inrush current peak value.
For 1 s max.
Rated input voltage range is 100 – 240 VAC (nominal 230 VAC). Nominal frequency range is 50 – 60 Hz; operating frequency range is
47 – 440 Hz (440 Hz for 115 V mains). For frequencies
≥
63 Hz, refer to
Installation Instructions.
BCD20002-G Rev AC, 31-Jan-2014
MELCHER
The Power Partners.
Page 5 of 31
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