Rugged Environment
DC-DC Converters >100Watt
K Series
Electrical Input Data
General Conditions
– TA = 25°C, unless TC is specified.
– Pin 18 connected to pin 14, Uo adjusted to Uo nom (option P); R input not connected.
– Sense line pins S+ and S– connected to Vo+ and Vo– respectively.
Table 2a: Input data
Input
AK
BK
FK
Characteristics
Conditions
min
8
typ
max
35
min
14
typ
max
70
min
20
typ
max
Unit
Ui
Operating input voltage
Io = 0…Io nom
TC min…TC max
100
V DC
Ui nom Nominal input voltage
15
30
48
1
Ii
Input current
Ui nom, Io nom
9.0
6.0
3.75
A
Pi0
No-load input power
Idle input power
Input resistance
NTC resistance 2
Input capacitance
Conducted input RFI
Radiated input RFI
Ui min…Ui max
unit inhibited
TC = 25°C
2.5
1.5
2.5
1.5
2.5
1.5
W
Pi inh
Ri
65
100
300
70
mΩ
µF
3
3
3
RNTC
Ci
830
1250
40
450
80
1200
1800
100
Ui RFI
EN 55022
Ui nom, Io nom
A
A
B
A
B
B
Ui abs
Input voltage limits
without damage
0
0
0
V DC
Table 2b: Input data
Input
CK
DK
EK
Characteristics
Conditions
min
28
typ
max
140
min
44
typ
max
220
min
67
typ
max
385
Ui
Operating input voltage
Io = 0…Io nom
TC min…TC max
V DC
Ui nom Nominal input voltage
60
110
1.6
220
0.8
1
Ii
Input current
Ui nom, Io nom
3.0
A
Pi0
No-load input power
Idle input power
Input resistance
NTC resistance 2
Input capacitance
Conducted input RFI
Radiated input RFI
Ui min…Ui max
unit inhibited
TC = 25°C
2.5
1.5
2.5
1.5
2.5
1.5
W
Pi inh
Ri
150
800
660
170
1600
260
180
3200
210
mΩ
µF
RNTC
Ci
1000
154
400
400
400
Ui RFI
EN 55022
Ui nom, Io nom
B
B
B
B
B
B
Ui abs
Input voltage limits
without damage
0
0
400 4
0
V DC
1 With double output modules, both outputs loaded with Io nom
.
2 Valid for -7 versions with NTC, (-9 versions exclude the NTC). Initial switch-on cycle. Subsequent switch-on/off cycles increase the in-
rush current peak value.
3 AK, BK and FK types have no NTC (inrush current limiter) fitted.
4 1 s max., duty cycle 1% max.
Input Transient Protection
tremely wide input range is required. The EK input range for
110 V batteries has been designed and tested to meet this
requirement.
A suppressor diode or a VDR (depending upon the input
voltage range) together with the input fuse and a symmetri-
cal input filter form an effective protection against high input
transient voltages which typically occur in most installa-
tions, but especially in battery driven mobile applications.
Inrush Current Limitation
The CK, DK, EK modules 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 connec-
tors and switching devices from damage. Subsequent
switch-on cycles within short periods will cause an increase
of the peak inrush current value due to the warming-up of
the NTC resistor. See also: E option.
Nominal battery voltages in use are: 12, 24, 36, 48, 60, 72,
110 and 220 V. In most cases each nominal value is speci-
fied in a tolerance of –30%...+25%.
In certain applications, surges according to RIA 12 are
specified in addition to those defined in IEC 571-1. The
power supply must not switch off during these surges and
since their energy can practically not be absorbed an ex-
Edition 4/4.99
5/31
MELCHER
The Power Partners.
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