150 Watt DC-DC and AC-DC Converters
K Series
Features
• RoHS lead-free-solder and lead-solder-exempted
products available
• 5 year warranty for RoHS compliant products with an
extended temperature range
• Compliant with EN 50155, EN 50121-3-2
• Fire & smoke according to EN 45545 and NF-F16
(ver. V108 or later; not models with H15-S4 connector)
• Class I equipment
• Extremely 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 & short-circuit proof
• Rectangular current limiting characteristic
• PCBs protected by lacquer
• Very high reliability
Safety-approved to the latest edition of IEC/EN 60950-1
and UL/CSA 60950-1
111
4.4"
3U
80
3.2"
16 TE
168
6.6"
Table of Contents
Description........................................................................................2
Model Selection ................................................................................2
Functional Description ......................................................................5
Electrical Input Data .........................................................................6
Electrical Output Data.......................................................................9
Auxiliary Functions .........................................................................13
Electromagnetic Compatibility (EMC) .............................................17
Immunity to Environmental Conditions ...........................................19
Mechanical Data .............................................................................20
Safety and Installation Instructions .................................................22
Description of Options ....................................................................26
Accessories ....................................................................................34
belfuse.com/power-solutions
BCD20002-G Rev AG, 19-Jul-2018
K Series
Description
150 W DC-DC and AC-DC Converters
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).
Model Selection
Non-standard input/output configurations or special customer adaptations are available on request.
Table 1a: Models AK
Output 1
V
o nom
[VDC]
5.1
12
15
24
12
15
24
1
2
3
4
Output 2
V
o nom
[VDC]
-
-
-
-
12
3
15
3
24
3
I
o nom
[A]
-
-
-
-
5
4
2.5
Input Voltage
V
i min
–
V
i max
8 - 35 VDC
AK1001-9RG
AK1301-9RG
AK1501-9RG
AK1601-9RG
AK2320-9RG
AK2540-9RG
AK2660-9RG
Efficiency
1
η
min
[%]
79
81
83
84.5
79
80.5
80.5
Options
I
o nom
[A]
20
10
8
5
5
4
2.5
-7
⁴,
P, D, V ², T, B, B1, non-G
-7
⁴, P, D,
T, B, B1, non-G
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).
NFND: Not for new designs.
Preferred for new designs
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Page 2 of 35
K Series
150 W DC-DC and AC-DC Converters
Table 1b: Models BK, FK, CK
Output 1
V
o nom
[VDC]
5.1
12
15
24
12
15
24
I
o nom
[A]
25
12
10
6
6
5
3
Output 2
V
o nom
[VDC]
-
-
-
-
12
3
15
3
24
3
I
o nom
[A]
-
-
-
-
6
5
3
Input Voltage
V
i min
–
V
i max
14 - 70 VDC
BK1001-9RG
BK1301-9RG
BK1501-9RG
BK1601-9RG
BK2320-9RG
BK2540-9RG
BK2660-9RG
Effic.
1
η
min
[%]
80.5
83
84
85
80
82
82
Input Voltage
V
i min
–
V
i max
20 - 100 VDC
FK1001-9RG
FK1301-9RG
FK1501-9RG
FK1601-9RG
FK2320-9RG
FK2540-9RG
FK2660-9RG
Effic.
1
η
min
[%]
80
82
85
86
81
83
84
Input Voltage
V
i min
–
V
i max
28 - 140 VDC
CK1001-9RG
CK1301-9RG
CK1501-9RG
CK1601-9RG
CK2320-9RG
CK2540-9RG
CK2660-9RG
Effic.
1
η
min
[%]
80
82
85
86
81
84
84
-7
⁴,
P, D, V ², T, B, B1, non-G
Options
-7
⁴, P,
D, T, B, B1, non-G
Table 1c: Models DK, EK, LK
Output 1
V
o nom
[VDC]
5.1
12
12.84
15
24
12
15
24
25.68
6
1
2
3
4
5
5
Output 2
V
o nom
[VDC]
-
-
-
-
-
12
3
15
3
24
3
I
o nom
[A]
-
-
-
-
-
6
5
3
2.5
Input Voltage
V
i min
–
V
i max
44 - 220 VDC
DK1001-9ERG
DK1301-9ERG
DK1740-9ERG
DK1501-9ERG
DK1601-9ERG
5
Effic.
1
η
min
[%]
80
83
83
85
86
81
83
84
84
Input Voltage
V
i min
–
V
i max
67 - 385 VDC
---
EK1301-9ERG
---
EK1501-9ERG
EK1601-9ERG
EK2320-9ERG
EK2540-9ERG
EK2660-9ERG
---
Effic.
1
η
min
[%]
---
Input Voltage
V
i min
–
V
i max
88 - 372 VDC
100 - 240 VAC
LK1001-9ERG
LK1301-9ERG
LK1740-9ERG
5
LK1501-9ERG
LK1601-9ERG
LK2320-9ERG
LK2540-9ERG
LK2660-9ERG
LK2740-9ERG
6
Effic.
1
η
min
[%]
79
83
83
84
85
81
83
82
83
Options
I
o nom
[A]
25
12
10
10
6
6
5
3
2.5
83
---
84
86
82
83
84
---
-7
⁴,
P, D, V ², T, B, B1, non-G
25.68
3
,
6
DK2320-9ERG
DK2540-9ERG
DK2660-9ERG
DK2740-9ERG
6
-7
⁴, P, D,
T, B, B1, non-G
6
7
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 LK with 5.1 V output in order to avoid the H15S4 connector. Efficiency is approx. 1.5% worse.
NFND: Not for new designs.
Preferred for new designs
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BCD20002-G Rev AG, 19-Jul-2018
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Page 3 of 35
K Series
150 W DC-DC and AC-DC Converters
Part Number Description
CK 2 5 40 -9 E R D3 T B1 G
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
12 V .............................................................................3
15 V .............................................................................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 .......................... G
1
2
3
4
5
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.
Note:
The sequence of options must follow the order above. This part number description is descriptive only; it is not intended for creating
part numbers.
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.
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Page 4 of 35
K Series
150 W 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 synchronous 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
Control circuit
C
i
+
22 T
12 S+
4
Output
filter
Bridge
rectifier
4
Forward converter
(approx. 120 kHz)
C
Y
6
8
10
Vo+
Fuse
3
C
Y
Vo–
L
4
30
Vi– 32
24
C
Y
14 S–
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
Fig. 1
Block diagram of single-output converters
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
6
8
10
Vo2+
Fuse
C
Y
3
C
Y
L
4
Vi–
30
32
24
Output 2
filter
C
Y
C
Y
Vo2–
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
Fig. 2
Block diagram of double-output models
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