RCM Series Data Sheet
150 /300 W DC-DC Converters
Description
The RCM Series converters are reliable power supplies for
railway and transportation systems. There are 2 input voltage
ranges covering all common railway batteries. The output
delivers 150 or 300 W at 12 or 24 V. The converters are
designed for chassis mounting and exhibit a closed housing
with cooling openings.
Many options are available, such as an output ORing FET for
redundant operation, output voltage adjustment, interruption
time of 10 ms (class ST2), shutdown input, and an output
voltage monitor controlling a relay (change-over contact).
Features
• RoHS lead-free-solder product
• 2 input voltage ranges, covering all railway batteries
• Single output, 12 or 24 V
• Closed housing for chassis mounting
• Extremely high efficiency and high power density
• Low inrush current
• 3 connectors: Input, output, auxiliary
• Overtemperature, overvoltage, overcurrent, and overload
protection
• Many options available
• Compliant to EN 50155, EN 50121-3-2, AREMA
• Fire and smoke: compliant to EN 45545 and NFPA 130
• Warranty 5 years.
Safety-approved to the latest edition of IEC/EN 60950-1
and UL/CSA 60950-1
1
1
1
pending
Table of Contents
Page
Page
Electromagnetic Compatibility (EMC) .................................. 9
Immunity to Environmental Conditions .............................. 11
Mechanical Data ................................................................. 12
Safety and Installation Instructions .................................... 13
Accessories ........................................................................ 14
Description ............................................................................ 1
Model Selection .................................................................... 2
Functional Description .......................................................... 3
Electrical Input Data .............................................................. 4
Electrical Output Data ........................................................... 6
Description of Options ......................................................... 8
Copyright © 2018, Bel Power Solutions Inc. All rights reserved.
BCD.00791 Rev AE, 28-Mar-2018
MELCHER
The Power Partners.
Page 1 of 14
RCM Series Data Sheet
150 /300 W DC-DC Converters
Model Selection
Table 1: Model Selection
V
i min1
[V]
14.4
43.2
14.4
43.2
Input voltage
V
i cont
[V]
16.8
50.4
16.8
50.4
(24)
45
V
i max1
[V]
50.4
154
50.4
154
Output
V
o nom
I
o nom
[V]
[A]
12
24
12
24
12
24
12
24
12.5
6.25
12.5
6.25
25
12.5
25
12.5
Power
P
o nom
[W]
150
150
150
150
300
300
300
300
Efficiency
2
η
min
η
typ
[%]
88
90
91
92
89
90
91
92
90
91
92.5
93
90.5
91
92.5
93.5
Model
[%]
24RCM150-12
24RCM150-24
110RCM150-12
110RCM150-24
24RCM300-12
24RCM300-24
110RCM300-12
110RCM300-24
D, M, Q, F, K
Options
(110) 137.5
(24)
45
(110) 137.5
1
2
Short time; see table 2 for details.
Efficiency at
T
A
= 25 °C,
V
i nom,
I
o nom
,
V
o nom
, only option D fitted.
Part Number Description
Operating input voltage
V
i cont
(continuously):
16.8 – 45 VDC
..........................................................
24
50.4 – 137.5 VDC
....................................................
110
Series ........................................................................... RCM
Output power:
150 W .................................................................... 150
300 W .................................................................... 300
Nominal output voltage:
12 V .......................................................................... -12
24 V .......................................................................... -24
Auxiliary functions and options:
Out OK, output voltage adjust, shutdown
1
.................. D
Interruption time .......................................................... M
ORing FET ................................................................... Q
Fuse built-in ................................................................. F
Pluggable Connectors ................................................ K
1
110 RCM 150 -24 D M Q F K
Opt. D requires the auxiliary connector.
Note:
The sequence of options must follow the order above.
Note:
All models are RoHS-compliant for all six substances.
Available combinations of options:
24/110RCMxxx-xx (K)
24/110RCMxxx-xxD (K)
24/110RCMxxx-xxDF (K)
24/110RCMxxx-xxDMQ (K)
24/110RCMxxx-xxDMQF (K)
Example: 110RCM150-24DMQ: DC-DC converter, input
voltage range 50.4 to 137.5 V continuously, output
providing 24 V / 6.25 A, monitoring relay, output
voltage adjust, shutdown input, interruption time
10 ms, integrated ORing FET, operating ambient
temperature
T
A
= – 40 to 70 °C, RoHS-compliant
for all six substances.
Product Marking
Type designation, applicable safety approval and recognition
marks, CE mark, pin allocation, and product logo.
Input voltage range and input current, nominal output voltage
and current, degree of protection, batch no., serial no., and
data code including production site, version (modification
status) and date of production.
BCD.00791 Rev AE, 28-Mar-2018
MELCHER
The Power Partners.
Page 2 of 14
RCM Series Data Sheet
150 /300 W DC-DC Converters
Functional Description
The converters are designed as active clamp forward con-
verters with a switching frequency of approximately 120 kHz.
The built-in high-efficient input filter together with a small input
capacitance generates very low inrush current of short
duration. An
antiparallel
diode acts as reverse polarity pro-
tection together with the external circuit breaker or fuse.
The circuitry providing the interruption time (opt. M) is located
after the input filter.
The rectification on the secondary side is provided by syn-
chronous rectifiers, in order to keep the losses as low as
possible. The output voltage control logic is located on the
secondary side and influences the primary logic through
magnetic feedback.
An auxiliary converter supplies all circuits with a stable bias
voltage.
An output ORing FET is available (option Q) and allows for a
redundant power supply system. If there are no external circuit
breakers, it is possible to order the converter with incor-
porated fuse (opt. F). Because this fuse is not accessible, a
serial diode provides reverse polarity protection (only with
option F or M).
Opt. D encompasses an additional auxiliary connector and
allows for output voltage adjust and a primary shutdown. An
output voltage monitor controls a relay with a change-over
contact.
R–
R R
R+
JM194f
NTC
OK1
Primary
control logic
Secondary
control logic
OK2
SD
SD0
Isolated
driver
Isolation
OK0
Vi+
Fuse
(option F)
1
NTC
Opt. M
2
Input
filter
C
hu
Opt. Q
+
Vo+
Output
filter
Vo–
Vi–
Auxiliary
converter
C
y
C
y
PE
C
y
Auxiliary connector (only with option D)
1
2
Series diode, only fitted with opt. F or M
Bipolar suppressordiode with opt. F or M
Fig. 1
Block diagram
BCD.00791 Rev AE, 28-Mar-2018
MELCHER
The Power Partners.
Page 3 of 14
RCM Series Data Sheet
150 /300 W DC-DC Converters
Electrical Input Data
General Conditions:
–
T
A
= 25 °C, unless
T
C
is specified.
Table 2a: Input data of RCM150
Input
Characteristics
V
i cont
V
i 2s
V
i nom
V
i abs
I
i
P
i 0
P
i SD
C
i
R
i
I
inr p
t
inr d
t
on
Operating input voltage
continuous
for
≤
2 s
Nominal input voltage
Input voltage limits
Typical input current
No-load input power
Idle input power
Input
capacitance
1
3 s without damage
V
i nom
,
I
o nom
V
i min
–
V
i max
,
I
o
= 0
V
i min
–
V
i max
,
V
SD
= 0 V
0
6.8
2.5
0.7
40
100
V
i
=
V
i max
,
P
o nom
0
→
V
i min,
P
o nom
V
i min
,
P
o nom
V
SD
= 0
→
5 V
75
0.5
1000
300
4
1.5
Conditions
I
o
= 0 –
I
o max
T
C min
–
T
C max
without shutdown
min
16.8
14.4
24, (36)
55
0
1.5
4
2
0.7
2
10
100
100
0.5
1000
300
6
1.5
µF
mΩ
A
ms
24RCM150
typ
(24)
max
45.0
50.4
min
50.4
43.2
110RCM150
typ
(110)
max
137.5
154
V
Unit
(72), (96), 110
165
A
W
Input resistance
Peak inrush current
Duration of inrush current
Start-up time at switch on
Start-up time after removal
of shutdown
Table 2b: Input data of RCM300
Input
Characteristics
V
i cont
V
i 2s
V
i nom
V
i abs
I
i
P
i 0
P
i SD
C
i
R
i
I
inr p
t
inr d
t
on
Operating input voltage
continuous
for
≤
2 s
Nominal input voltage
Input voltage limits
Typical input current
No-load input power
Idle input power
Input capacitance
1
Input resistance
Peak inrush current
Duration of inrush current
Start-up time at switch on
Start-up time after removal
of shutdown
1
2
24RCM300
Conditions
I
o
= 0 –
I
o max
T
C min
–
T
C max
without shutdown
min
16.8
14.4
24 (36)
3 s without damage
V
i nom
,
I
o nom
V
i min
–
V
i max
,
I
o
= 0
V
i min
–
V
i max
,
V
SD
= 0 V
6
140
V
i
=
V
i max
,
P
o nom
0
→
V
i min,
P
o nom
V
i min
,
P
o nom
V
SD
= 0
→
5 V
120
0.5
1000
300
0
13.9
4
6
1.5
55
0
typ
(24)
max
45.0
50.4
min
50.4
43.2
110RCM300
typ
(110)
max
137.5
154
(72) (96) 110
165
3
4
6
1.5
12
140
150
0.5
1000
300
Unit
V
A
W
µF
mΩ
A
ms
Not smoothed by the inrush current limiter at start-up (for inrush current calculation)
Typ. value at
V
i max
. At lower
V
i
, the idle and low-load input power are smaller.
BCD.00791 Rev AE, 28-Mar-2018
MELCHER
The Power Partners.
Page 4 of 14
RCM Series Data Sheet
150 /300 W DC-DC Converters
Input Transient and Reverse Polarity Protection
A suppressor diode and a symmetrical input filter form an
effective protection against input transients, which typically
occur in many installations, but especially in battery-driven
mobile applications.
If the input voltage has the wrong polarity, the incorporated
antiparallel diode causes the external input circuit breaker or
fuse to trip. With option M or F (incorporated fuse), an active
reverse-polarity protection circuit prevents from any damage.
not reach stable operating conditions. Worst case conditions
are at lowest
V
i
and highest output power
P
o
.
Recommended values for
C
ext
for different batteries are listed
in table 3, which should allow for stable operation up to an
input inductance of 2 mH.
C
i
is specified in table 2.
Efficiency
The efficiency depends on the model and on the input voltage.
η
[%]
100
90
V
i
= 137 V
V
i
= 50 V
110RCM150-12DMQ
JM217
Input Under- / Overvoltage Lockout
If the input voltage is out of range, an internally generated
inhibit signal disables the converter to avoid any damage.
V
i
= 110 V
Inrush Current and Stability with Long Supply Lines
The converter operates with relatively small input capacitance
C
i
resulting in low inrush current of short duration.
If a converter is connected to the power source through supply
lines with reasonable length, no additional measures are
necessary to ensure stable operation.
Only in the case of very long supply lines exhibiting a con-
siderable inductance
L
ext
, an additional external capacitor
C
ext
connected across the input pins improves the stability and
prevents oscillations; see fig. 2.
JM085d
80
70
60
0
0.2
0.4
0.6
0.8
P
o
/
P
o nom
Fig. 3a
Efficiency versus V
i
and P
o
(110RCM150-12DMQ)
η
[%]
110RCM150-24DMQ
JM210b
L
ext
+
R
ext
C
ext
Vi+
R
i
Converter
C
i
r
i
Vo+
Load
100
90
V
i
= 50 V
V
i
= 110 V
Vi–
Vo–
80
V
i
= 137 V
Fig. 2
Input configuration
Actually, an RCM Series converter with its load acts as
negative resistor
r
i
, because the input current
I
i
rises, when
the input voltage
V
i
is decreased. It tends to oscillate with a
resonant frequency determined by the line inductance
L
ex t
and
the input capacitance
C
i
+
C
ext
, damped by the resistor
R
ext
.
The whole system is not linear at all and eludes a simple
calculation. One basic condition is given by the formula:
L
ext
•
P
o max
C
i
+ C
ext
> — ———
— ——
——
—
R
ext
•
V
i min
²
dV
i
(
r
i
= —— )
—
d
I
i
70
60
0
0.2
0.4
0.6
0.8
P
o
/
P
o nom
Fig. 3b
Efficiency versus V
i
and P
o
(110RCM150-24DMQ)
η
[%]
100
90
V
i
= 137 V
V
i
= 50 V
110RCM300-24DMQ
JM218
V
i
= 110 V
R
ext
is the series resistor of the voltage source including
supply lines. If this condition is not fulfilled, the converter may
Table 3: Recommended values for the capacitor C
ext
V
B nom
24 V
36 V
72 V
110 V
RC150
1500 µF
1000 µF
220 µF
100 µF
RCM300
3000 µF
2000 µF
440 µF
200 µF
Rated voltage
40 V
63 V
125 V
200 V
80
70
60
0
0.2
0.4
0.6
0.8
P
o
/
P
o nom
Fig. 3c
Efficiency versus V
i
and P
o
(110RCM300-24DMQ)
BCD.00791 Rev AE, 28-Mar-2018
MELCHER
The Power Partners.
Page 5 of 14
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