IMX70, IMY70 Series Data Sheet
70 to 90 Watt DC-DC Converters
Features
•
RoHS compliant for all six substances
• Extremely wide input voltage ranges up to 154 VDC
• 1 or 2 outputs up to 48 V
• Basic insulation: IMX models
63.5
2.5"
12.5
0.49"
76.2
3"
• Class I equipment with reinforced insulation: IMY models
• 1500 to 3000 VAC i/o electric strength test voltage
• Electrical isolation between outputs
• Programmable input undervoltage lockout
• Shutdown/inhibit input
• Adjustable output voltages with flexible load distribution
• Sense lines and current share option
• External frequency synchronization
• Output(s) no-load, overload, and short-circuit proof
• Operating ambient temperature from – 40 to 95 °C
• Thermal protection
• Planar technology for best stability
• Metallic case with 12.5 mm profile or open frame with
9.75 mm
Safety-approved to IEC/EN 60950 -1 and UL/CSA 60950-1
2
nd
Edition. CE mark for 110IMY70.
47.8
1.88"
9.75
0.38"
72.7
2.86"
Description
The IMX/IMY70 Series of board-mountable 70 Watt DC-DC
converters has been designed according to the latest industry
requirements and standards. The converters are particularly
suitable for use in mobile or stationary applications in
transport, railways, industry, or telecommunication, where
variable input voltages or high transient voltages are
prevalent.
Covering a total input voltage range from 14.4 V up to 154 V
with 3 different models, the converters are available with one
or two electrically isolated outputs from 5 V to 48 V, externally
adjustable and with flexible load distribution. A shutdown input
allows remote converter on/off. Features include consistently
high efficiency over the entire input voltage range, high
reliability, and excellent dynamic response to load and line
changes.
The converters are designed according to the international
safety standards IEC/EN/UL 60950-1 2
nd
Edition. The con-
verters 24IMX70 and 40IMX70 exhibit basic insulation for the
specified input voltage, whereas the converters 110IMY70
have reinforced insulation.
The circuit is comprised of 2 planar magnetic devices. The
components are automatically assembled and securely
soldered onto a single PCB without any wire connection.
Magnetic feedback ensures maximum repeatability in the
control loop over all operating conditions and best reliability.
Careful consideration of possible thermal stress ensure the
absence of hot spots, such providing long life in en-
vironments, where temperature cycles are present. The
thermal design without using any potting material allows
operation up to an ambient temperature of 70 °C in free air
and up to 100 °C with forced cooling. For extremely high
vibration environments the case has holes for screw
mounting.
Table of Contents
Page
Page
Electromagnetic Compatibility (EMC) ................................. 11
Immunity to Environmental Conditions ............................... 12
Mechanical Data .................................................................. 13
Safety and Installation Instructions ..................................... 14
Options ................................................................................ 15
Description ............................................................................ 1
Model Selection ..................................................................... 2
Functional Description .......................................................... 3
Electrical Input Data .............................................................. 4
Electrical Output Data ............................................................ 6
Auxiliary Functions ............................................................... 10
Copyright © 2015, Bel Power Solutions Inc. All rights reserved.
BCD.00002 Rev AH, 17-Aug-2015
MELCHER
The Power Partners.
Page 1 of 15
IMX70, IMY70 Series Data Sheet
70 to 90 Watt DC-DC Converters
Model Selection
Table 1: Model Selection
Output 1
V
o nom
[V]
5.1
5.1
5.1
12
12
12
15
15
15
24
24
24
1
2
3
Output 2
V
o nom
[V]
-
-
-
-
-
-
-
-
-
24
24
24
I
o nom
[A]
-
-
-
-
-
-
-
-
-
1.3
1.3
1.3
V
i min2
[V]
12
21.6
43.2
12
21.6
43.2
12
21.6
43.2
12
21.6
43.2
Input voltage
V
i cont
[V]
15 to 33.6
25 to 72
50 to 137.5
15 to 33.6
25 to 72
50 to 137.5
15 to 33.6
25 to 72
50 to 137.5
15 to 33.6
25 to 72
50 to 137.5
V
i max2
[V]
40.1
75
154
40.1
75
154
40.1
75
154
40.1
75
154
Effic.
η
1
min.
[%]
typ.
[%]
Model
Opt.
I
onom
[A]
12
12
12
7.0
7.5
7.5
5.7
6.0
6.0
1.3
1.3
1.3
89.5
91
90
91
90
87
89
91
93
93
92
93
90
91
24IMX70-05-0TG
3
40IMX70-05-0TG
3
110IMY70-05-0TG
24IMX70-12-0TG
40IMX70-12-0TG
3
110IMY70-12-0TG
24IMX70-15-0TG
40IMX70-15-0TG
3
110IMY70-15--0TG
24IMX70-24-24-0G
40IMX70-24-24-0G
3
110IMY70-24-24-0G
i, Z
i, Z
i, Z
i, Z
Efficiency at
T
A
= 25 °C,
V
i nom
,
I
o nom
Short time; see table 2 for details
Contact the Company for lead times and availability.
Note:
The sequence of options/features must follow the order above.
Part Number Description
110 IMY 70 - 24 - 24 - 0 i Z G
Input voltage
V
i
24 V battery ................................................ 24
36 V and 48 V battery ................................. 40
72 V, 96 V, 110 V battery .......................... 110
Series .......................................................... IMX70, IMY70
Output voltage of output 1 ............................ 05, 12, 15, 24
Output voltage of output 2 ............................ 05, 12, 15, 24
Operating ambient temperature range
T
A
= –40 to 95 °C ...................................... - 0
Options:
Inhibit ............................................................ i
Current sharing function ........................... T
1
Open frame ................................................. Z
RoHS-compliant for all 6 substances ...... G
2
Feature:
1
2
Standard feature for single-output models, not available for dual-output models
G is standard and is placed at the end of the part number
Note:
The sequence of options/features must follow the order above.
Product Marking
Converters without option Z are marked with the type
designation, input and output voltages and currents,
applicable safety approval and recognition marks, company
logo, date code, and serial no.
BCD.00002 Rev AH, 17-Aug-2015
MELCHER
The Power Partners.
Page 2 of 15
IMX70, IMY70 Series Data Sheet
70 to 90 Watt DC-DC Converters
Functional Description
The IMX/IMY70 Series converters are comprised of a
feedback-controlled forward converter using current-mode
pulse width modulation (PWM). The switching frequency is
fixed; it can by externally synchronized for double-output
models. The main transformer and the output choke are
designed in planar technology, which guarantees excellent
mechanical features and reproducibility of electric properties.
No optocouplers are used.
Single-output converters exhibit at the output a synchronous
rectifier and sense lines to ensure accurate output voltage
regulation. An auxiliary input R allows adjustment of the output
voltage. Proper parallel operation is possible using the current
sharing feature.
Double-output converters exhibit Schottky diodes at both
outputs. The first output voltage is sensed and accurately
regulated by influencing the PWM via the magnetic feedback.
PUL
1
8
The output voltage is transferred to the primary side by
magnetic feedback via a pulse transformer. The 2
nd
output is
tracking. The close magnetic coupling of the main transformer
and the main choke guarantee minor deviation of both output
voltages. Both outputs can be simultaneously adjusted by the
R input located on the secondary side.
A current limitation circuits limits the possible output power.
The topology allows for single-output models an unlimited
output capacity and for double-output models a high output
capacity; see
Electrical Output Data.
An incorporated protection disables the converter in an
overtemperature condition. The converter automatically
recovers, after the temperature has dropped below the limit.
The input voltage is monitored, shutting down the converter in
an overvoltage condition. The minimum input voltage for start-
up can be externally adjusted, which helps to limit the input
current at low input voltage.
JM027c
n.c.
1
6
8
Ref
7
SD
8
1 kΩ
11
T
Primary
control circuit
Isolation
Secondary
control circuit
Synchr. rect.
drive
NTC
19
R
19
13
S+
16
Opt. i
Vi+
2
5
Vo+
Vi+
4
Input
filter
Vi–
2
Vi–
2
3
Auxiliary
converter
350 kHz
17
14
Vo–
15
C
y
C
y
12
13
18
S–
Fig. 1
1
Not connected
2
Connected for 24IMX models only
n.c.
1
Block diagram of single-output models
PUL
1
8
W
6
8
JM026c
Ref
7
SD
8
1 kΩ
Primary
control circuit
Opt. i
PTC
Secondary
control circuit
11
n.c.
1
Isolation
19
19
R
Vi+
2
5
Vi+
4
13
Vo2+
Input
filter
Vi–
2
14
Vo2–
16
Vo1+
Vi–
2
3
C
y
C
y
15
Vo1–
18
17
12
n.c.
1
Fig. 2
1
Not connected
2
Connected for 24IMX models only
n.c.
1
n.c.
1
Block diagram of double-output models
BCD.00002 Rev AH, 17-Aug-2015
MELCHER
The Power Partners.
Page 3 of 15
IMX70, IMY70 Series Data Sheet
70 to 90 Watt DC-DC Converters
Electrical Input Data
General conditions:
T
A
= 25°C, shutdown and R pin left open-circuit, unless specified.
Table 2: Input data
Input
Characteristics
V
i
V
i nom
V
i 2s
V
i sur
t
start up
Operating input voltage
Nominal input voltage
Temporary input voltage
Repetitive surge voltage
Converter
start-up time
Rise time
No-load input current
Reflected ripple current
Inrush peak current
Input capacitance
Shutdown voltage
Switch on
––
SD high
for 2 s, no shutdown
shutdown, no damage
Worst case condition at
V
i min
and full load
V
i
= 0
→
V
i nom
,
I
o nom
I
o
= 0,
V
i min
–
V
i max
I
o
= 0 –
I
o nom
V
i
=
V
i max
for surge calculation
Converter disabled
Converter operating
––
I
SD
––
I
i SD
24IMX70
Conditions
T
A min
to
T
A max,
I
o
= 0 –
I
o nom
min
15
1
24
12
1
40.1
50
500
500
25
200
30
25
24
– 0.7 to +0.7
2 to 20 (or open-circuit)
– 0.2
V
i
min
40 IMX70
max
33.6
min
25
1
(36) 48
21.6
1
75
100
typ
max
72
Unit
typ
VDC
ms
t
rise
I
i o
I
irr
I
inr p
C
i
––
V
S D
mA
mA
pp
A
µF
– 0.7 to +0.7
2 to 20 (or open-circuit)
mA
2
210
2
200
kHz
V
Shutdown pin current
Input current at shutdown
Switching frequency
–
V
i max
V
i min
–
V
i max
,
I
o
= 0 –
I
o nom
f
s
200
2
Input
Characteristics
V
i
V
i nom
V
i 2s
V
i sur
t
start up
Operating input voltage
Nominal input voltage
Temporary input voltage
Repetitive surge voltage
Converter
Switch on
start-up time ––
SD high
Rise time
No-load input current
Reflected ripple current
Inrush peak current
Input capacitance
Shutdown voltage
for 2 s, no shutdown
shutdown, no damage
Worst case condition at
V
i min
and full load
V
i
= 0
→
V
i nom
,
I
o nom
I
o
= 0,
V
i min
–
V
i max
I
o
= 0 –
I
o nom
V
i
=
V
i max
for surge calculation
Converter disabled
Converter operating
––
I
SD
––
I
i SD
110IMY70
Conditions
T
A min
to
T
A max,
I
o
= 0 –
I
o nom
min
50
(72, 96,) 110
43.2
1
154
168
250
500
500
25
25
50
200
35
7.7
– 0.7 to +0.7
2 to 20 (or open-circuit)
– 0.2
V
i
min
Unit
max
137.5
VDC
typ
ms
t
rise
I
i o
I
irr
I
inr p
C
i
––
V
SD
mA
mA
pp
A
µF
V
Shutdown pin current
Input current at shutdown
Switching frequency
–
V
i max
mA
2
210
2
f
s
1
V
i min
–
V
i max
,
I
o
= 0 –
I
o nom
200
2
kHz
2
V
i min
will not be as stated, if
V
o
is increased above
V
o nom
by use of R-input. If the output voltage is set to a higher value,
V
i min
will be
proportionately increased.
typ. 240 kHz for single-output models, typ. 300 kHz for models with 5 V output
BCD.00002 Rev AH, 17-Aug-2015
MELCHER
The Power Partners.
Page 4 of 15
IMX70, IMY70 Series Data Sheet
70 to 90 Watt DC-DC Converters
Inrush Current
The inrush current has been kept as low as possible by
choosing a very small input capacitance. A series resistor may
be installed in the input line, in order to further reduce this
current.
A
40
30
20
10
0
20
40
60 µs
t
Input Transients Protection
When
V
i
exceeds 154 V, the converter is temporarily disabled.
Furthermore, a built-in suppressor diode provides effective
protection against higher input transients, which may be
generated for example by short-circuits across the input lines.
Table 4: Built-in transient voltage suppressor
JM028
Model
Breakdown
voltage
V
Br nom
[V]
56
Peak power
at 1 ms
P
p
[kW]
1.5
Peak pulse
current
I
pp
[A]
19.4
24IMX70
40IMX70
110IMY70
176
0.6
2.5
Fig. 3
Inrush current at V
i nom
, P
o nom
versus time (110IMY70-24-24-
8). Source impedance according to ETS 300132-2: L = 10
µH, R = 1.5
Ω
.
V
o
V
o nom
For very high energy transients as for example to achieve
IEC/EN 61000-4-5 compliance (as per table
Electromagnetic
Immunity)
an external inductor and capacitor are required. The
components should have similar characteristics as listed in
table below.
Table 5: Components for external circuitry to comply with
IEC/EN 61000-4-5; see table 10
t
rise
04008b
Model
24IMX70
40IMX70
t
startup
t
110IMY70
Inductor (L)
--
--
Capacitor (C)
330 µF / 100 V
150 µF / 200 V
Fig. 4
Converter start-up and rise time
L
Vi+
+
Vi–
JM029
Reverse Polarity Protection and Fuse
The built-in suppressor diode also provides for reverse
polarity protection at the input by conducting current in the
reverse direction. An external fuse is required to limit this
current.
Table 3: Recommended external fuses in the non-earthed
input line
Converter model
24IMX70 single-output
24IMX70 double-output
40IMX70 single-output
40IMX70 double-output
110IMY70 single-output
Littlefuse 372
3.15 A, 250 V
3.15 A, 250 V
Fuse type
Littlefuse 166
Littlefuse 166
Rating
10 A, 80 V
10 A, 80 V
C
Fig. 5
Example for external circuitry to comply with IEC/EN 61000-
4-5; see table 10
110IMY70 double-output Littlefuse 372
BCD.00002 Rev AH, 17-Aug-2015
MELCHER
The Power Partners.
Page 5 of 15
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