Cassette Style
AC-DC Converters
K Series
150 Watt AC-DC (DC-DC) Converters
for 400 Hz Mains
Input voltage range from 85...255 V AC
1 or 2 isolated outputs up to 48 V DC
4 kV AC I/O electric strength test voltage
• Input frequency range 47...440 Hz
• No PFC
•
Extremely wide input voltage range
•
Input over- and undervoltage lock-out
•
Efficient input filter and built-in surge and transient
suppression circuitry
•
Fully isolated outputs
•
Outputs overload, open- and short-circuit proof
•
No derating over entire operating temperature range
Safety according to IEC/EN 60950
LGA
K Series
111
4.4"
3U
80
3.2"
16 TE
168
6.6"
Summary
The K series of AC-DC (DC-DC) converters represents a
flexible range of power supplies for use in advanced elec-
tronic systems. Features include wide input frequency
range (no PFC), high efficiency, high reliability, low output
voltage noise and excellent dynamic response to load/line
changes.
The converter inputs are protected against surges and tran-
sients occuring at the source lines. An input over- and
undervoltage lock-out circuitry disables the outputs if the
input voltage is outside the specified range. Certain types
include an inrush current limitation preventing circuit break-
ers and fuses from being damaged at switch-on.
All outputs are open- and short-circuit proof and are pro-
tected against overvoltages by means of a built-in suppres-
sor diode. The outputs can be inhibited by a logic signal ap-
plied to the connector pin 18 (i). If the inhibit function is not
used pin 18 must be connected to pin 14 to enable the out-
puts.
LED indicators display the status of the converter and allow
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 modules are designed
and built according to the international safety standards
IEC/EN 60950 and have been approved by the safety
agencies LGA (Germany) und UL (USA). The UL Mark for
Canada has been officially recognized by regulatory au-
thorities in provinces across Canada.
The case design allows operation at nominal load up to
71°C in a free air ambient temperature. If forced cooling is
provided, the ambient temperature may exceed 71°C but
the case temperature must remain below 95°C under all
conditions.
A temperature sensor generates an inhibit signal which
disables the outputs if 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 in-
dividual applications.
The modules may either be plugged into 19" rack systems
according to DIN 41494, or be chassis mounted.
Important:
For applications with requirements for com-
pliance with IEC/EN 61000-3-2 (harmonic distortion)
please use our LK 4000 and LK 5000 series.
Table of Contents
Page
Page
Electromagnetic Compatibility (EMC) ............................ 13
Immunity to Environmental Conditions ........................... 15
Mechanical Data ............................................................ 16
Safety and Installation Instructions ................................ 17
Description of Options .................................................... 20
Accessories .................................................................... 26
Summary .......................................................................... 1
Type Survey and Key Data .............................................. 2
Type Key .......................................................................... 2
Functional Description ...................................................... 3
Electrical Input Data ......................................................... 4
Electrical Output Data ...................................................... 5
Auxiliary Functions ......................................................... 10
Edition 5/5.2000
1/26
Cassette Style
Type Survey and Key Data
AC-DC Converters
K Series
Non standard input/output configuration or special custom adaptions are available on request. See also:
Commercial Infor-
mation: Inquiry Form for Customized Power Supply.
Table 1: Type survey LK
Output 1
Output 2
Input voltage range and efficiency
1
Options
U
o nom
[V DC]
5.1
12.0
15.0
24.0
24.0
3
30.0
3
48.0
3
12.0
15.0
24.0
I
o nom
[A]
2
25.0
12.0
10.0
6.0
6.0
5.0
3.0
6.0
5.0
3.0
U
o nom
[V DC]
-
-
-
-
-
-
-
12.0
4
15.0
4
24.0
4
I
o nom
[A]
2
-
-
-
-
-
-
-
6.0
5.0
3.0
U
i min
...U
i max
85…264 V AC
(88...372 V DC)
LK 1001-7R
LK 1301-7R
LK 1501-7R
LK 1601-7R
LK 2320-7R
LK 2540-7R
LK 2660-7R
LK 2320-7R
LK 2540-7R
LK 2660-7R
h
min
[%]
79
84
84
85
81
83
83
81
83
83
-9
E
D
V
5
P
T
B1
B2
1
2
3
4
5
Efficiency at
U
i nom
and
I
o nom
.
If the output voltages are increased
above
U
o nom
via R-input control, op-
tion P setting, remote sensing or op-
tion T, the output currents should be
reduced accordingly so that
P
o nom
is not exceeded.
Series connection of output 1 and 2,
see:
R-Function for different output
configurations.
Second output semi-regulated.
Option V for LK 1001 types only.
Type Key
Type Key
Input voltage range
U
i
: 85…264 V AC (88...372 V DC) .... L
Series ............................................................................... K
Number of outputs ....................................................... 1...2
Single output units:
Nominal voltage output 1 (main output),
U
o1 nom
5.1 V ........................................................ 0, 1, 2
12 V ................................................................. 3
15 V ............................................................. 4, 5
24 V ................................................................. 6
other voltages .............................................. 7, 8
Other specs. for single output modules .................. 01...99
Symmetrical double output units:
Nominal voltage output 1/output 2,
U
o1/2 nom
12 V/12 V (24 V series connection) ............... 20
1
15 V/15 V (30 V series connection) ............... 40
1
24 V/24 V (48 V series connection) ............... 60
1
other symmetrical voltages .................... 70...99
Ambient temperature range
T
A
:
–25…71°C ..................................................... -7
–40…71°C ..................................................... -9
customer specific ..................................... -0...-6
Auxiliary functions and options:
Inrush current limitation ................................... E
Output voltage control input ........................... R
2
Potentiometer (output voltage adjustment) ..... P
2
Save data signal (D0...DD, to be specified) ... D
3
ACFAIL signal (V0, V2, V3, to be specified) ... V
3, 4
Current sharing ............................................... T
Cooling plate standard case ......................... B1
Cooling plate for long case 220 mm ............. B2
1
L K 2 5 40 -7 E R P D V T B1
2
3
4
External wiring of main and second output depending upon the desired output configuration (see:
R-Function for different output con-
figurations).
Feature R excludes option P and vice versa.
Option D excludes option V and vice versa.
Option V available for LK 1001 types.
Example: LK 2540-7PD3: AC-DC converter, input voltage range 85...264 V AC, double output, each providing 15 V/5 A,
equipped with potentiometer and undervoltage monitoring option. Ambient temperature –25...71°C.
Edition 5/5.2000
2/26
Cassette Style
Functional Description
AC-DC Converters
K Series
The input voltage is fed via an input fuse, an input filter, a
rectifier and an inrush current limiter to the input capacitor.
This capacitor sources a single transistor forward con-
verter. Each output is powered by a separate secondary
winding of the main transformer. The resultant voltages are
rectified and their ripples smoothed by a power choke and
output filter. The control logic senses the main output volt-
age
U
o1
and generates, with respect to the maximum ad-
missible output currents, the control signal for the primary
switching transistor.
The second output of double output units is controlled by
the main output but has independent current limiting. If the
main output is driven into current limitation, the second out-
put voltage will fall as well and vice versa.
P
03085
26
N 28
1
Y
Forward converter
(approx. 120 kHz)
Input filter
Y
Control circuit
Output
filter
16
18
20
22
12
4
6
8
10
R
i
D/V
T
S+
Vo+
3
Y
Vo–
2
P 30
32
24
Y
14 S–
Fig. 1
Block diagram of single output converters LK 1000
–
+
P
03086
26
N 28
1
Y
Forward converter
(approx.110 kHz)
Input filter
Y
Control circuit
16
18
20
22
R
i
D
T
Output 1
filter
12 Vo1+
14 Vo1–
4
Vo2+
6
8
Vo2–
10
3
Y
P 30
32
Y
24
Y
Output 2
filter
–
2
Y
Fig. 2
Block diagram of symmetrical double output converters LK 2000
1
2
3
+
Transient suppressor (VDR)
Inrush current limiter (NTC or option E), -9 version exclude the NTC
Input fuse
Edition 5/5.2000
3/26
Cassette Style
Electrical Input Data
AC-DC Converters
K Series
General Conditions
–
T
A
= 25°C, unless
T
C
is specified.
– Pin 18 connected to pin 14,
U
o
adjusted to
U
o nom
(option P); R input not connected.
– Sense line pins S+ and S– connected to Vo+ and Vo– respectively.
Table 2: Input data
Input
Characteristics
Conditions
min
85
88
310
LK
typ
max
264
372
Unit
V AC
V DC
3
1
U
i
Operating input voltage
I
o
= 0…I
o nom
T
C min
…
T
C max
U
i nom
Nominal input voltage
I
i
P
i0
P
i inh
R
i
R
NTC
C
i
U
i RFI
U
i abs
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
U
i nom
,
I
o nom
–400
–400
U
i nom
,
I
o nom 1
U
i min
…
U
i max
unit inhibited
With double output modules, both outputs
loaded with
I
o nom
2
Valid for -7 versions with NTC, (-9 versions ex-
clude the NTC). Initial switch-on cycle. Subse-
quent switch-on/off cycles increase the inrush
current peak value.
3
LK types may also be operated in DC mode.
(See:
K Series, DC-DC Converters)
0.4
2.5
1.5
480
3200
210
B
B
400
400
400
A
W
T
C
= 25°C
mΩ
µF
V DC
V
p
AC frequency range 47...440 Hz (440 Hz
for 115 V mains).
Above 70 Hz (at
U
i
= 264 V AC) the earth
lekage current may exceed 3.5 mA, speci-
fied in IEC/EN 60950. The built-in Y ca-
pacitors are specified for
≤100
Hz. Above
350 Hz the input voltage may not exceed
200 V AC.
Input Fuse
A fuse mounted inside the converter protects the module
against severe defects. If operated from a DC source this
fuse may not fully protect the module when the input volt-
age exceeds 200 V DC! In applications where the convert-
ers operate at source voltages above 200 V DC an external
fuse or a circuit breaker at system level should be installed!
Inrush Current Peak Value
The inrush current peak value (initial switch-on cycle) can
be determined by following calculation: (See also:
Input In-
rush Current Characteristic).
U
i source
I
inr p
= ––––––––––––––––
(R
s ext
+
R
i
+
R
NTC
)
04040
Table 3: Fuse Specification
Module
LK
1
1
R
s ext
Fuse rating
SPT
4 A, 250 V
+
U
i source
I
inr p
R
i
R
NTC
Fuse type
slow-blow
C
i int
Fuse size 5
×
20 mm.
Input Under-/Overvoltage Lock-out
If the input voltage remains below approx. 0.8
U
i min
or ex-
ceeds approx. 1.1
U
i max
, an internally generated inhibit sig-
nal disables the output(s). When checking this function the
absolute maximum input voltage rating
U
i abs
should be
considered! Between
U
i min
and the undervoltage lock-out
level the output voltage may be below the value defined in
table:
Output data
(see:
Technical Information: Measuring
and Testing).
Reverse Polarity Protection
The built-in bridge rectifier provides reverse polarity protec-
tion at the input.
Inrush Current Limitation
The modules of the versions -7 incorporate an NTC resistor
in the input circuitry which – at initial turn on – reduces the
peak inrush current value by a factor of 5...10 to protect
connectors and switching devices from damage. Subse-
quent switch-on cycles within short periods will cause an
increase of the peak inrush current value due to the warm-
ing-up of the NTC resistor. (see also:
option E)
Edition 5/5.2000
0.40
1
2
3
4
5
6
U
i
DC
_______
U
i min
DC
1.00
Fig. 3
Equivalent circuit diagram for input impedance
Static Input Current Characteristic
I
i
(A)
3.00
04048
Fig. 4
Input current versus relative input voltage
4/26
Cassette Style
Input Transient Protection
AC-DC Converters
Input Inrush Current Characteristic
I
imp
[A]
130
100
04050
K Series
A VDR together with the input fuse and a symmetrical input
filter form an effective protection against high input tran-
sient voltages.
Hold-up Time versus relative Input Voltage
t
h
(ms)
100.00
04049
50
10.00
2.00
1
2
3
4
5
6
_______
U
i
AC
0
1
2
3
t
[ms]
U
i min
AC
Fig. 5
Hold-up time t
h
versus relative input voltage U
i
/U
i min
.
Fig. 6
Inrush current versus time at U
i max
,
R
ext
= 0
Electrical Output Data
General Conditions
–
T
A
= 25°C, unless
T
C
is specified.
– Pin 18 (i) connected to pin 14 (S–/Vo1–),
U
o
adjusted to
U
o nom
(option P), R input not connected.
– Sense line pin 12 (S+) and pin 14 (S–) connected to pin 4 (Vo+) and pin 8 (Vo–) respectively.
Table 4a: Output data single output modules
Output
Characteristics
Conditions
LK 1001
5.1 V
min
5.07
7.6
typ
max
LK 1301
12.0 V
min
typ
max
LK 1501
15.0 V
min
typ
max
LK 1601
24.0 V
min
typ
max
24.14
43.5
6.0
6.2
5
5
60
±25
±30
5
5
90
±30
mV
mV
pp
A
Unit
V
U
o
U
op
I
o nom
I
oL
u
o
7
Output voltage
Overvoltage protection
(supressor diode)
Output current
1
Output current limit
4
U
i nom
,
I
o nom
5.13 11.93
21
12.0
12.2
5
5
50
±15
5
5
70
12.07 14.91
26.5
10
10.2
15.09 23.86
U
i min
...U
i max
T
C min
...T
C max
U
i min
...U
i max
26
25.0
Output Low frequency
U
i nom
,
I
o nom
voltage
IEC/EN 61204
Switching freq.
noise
BW = 20 MHz
Total
Static line regulation
D
U
o U
U
i min
...U
i nom
,
U
i nom
...U
i max
,
I
o nom
U
i nom
,
I
o
=
(0.1...1)
I
o nom
±100
0.3
–1
D
U
o I
Static load regulation
20
±100
0.4
–1
25
±100
0.4
–1
30
±80
0.4
–1
40
u
o d 5
t
d 5
a
Uo
1
Dynamic Voltage
U
i nom
,
I
o
=
load
deviation
I
o nom
↔
1
/
2
I
o nom
regulat.
IEC/EN 61204
Recovery time
Temperature coefficient
U
i min
...U
i max
of output voltage
6
0...I
o nom
ms
mV/K
If the output voltages are increased above
U
o nom
through R-input control, option P setting, remote sensing or option T, the output cur-
rents should be reduced accordingly so that
P
o nom
is not exceeded.
4
See:
Output Voltage Regulation of Single Output Units
or
Double Output Modules with Outputs 1 and 2 Connected in Series.
5
See:
Dynamic load regulation of U and U
o1
o2.
6
Negative temperature coefficient (0...–3 mV/cell and K) available on request.
7
Measured according to IEC/EN 61204 sub clause 3.10 with a probe acc. to annex A of the same standards. (See:Technical
Informa-
tion: Measuring and Testing)
Edition 5/5.2000
5/26
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