IMX35 Series Data Sheet
35 Watt Quad-Output DC-DC Converters
Features
•
RoHS lead-free-solder and lead-solder-exempted
products are available.
• Extremely wide input voltage ranges up to 150 VDC
• 4 outputs up to 60 V
• 1500 to 1800 VAC i/o electric strength test
• Electrical isolation between outputs
63.5
2.5"
10.5
0.41"
76.2
3"
• Programmable input undervoltage lockout
• Shutdown/inhibit input
• Adjustable output voltages with flexible load distribution
• Frequency synchronization
• Outputs no-load, overload, and short-circuit proof
• Operating ambient temperature from – 40 to 85
°
C
• Thermal protection
• Low profile: 10.5 mm or 8.9 mm with open frame
• Basic insulation
• Flexible output possibilities between 5 V and 60 V
47.8
1.88"
8.9
0.35"
72.8
2.87"
Safety-approved to IEC/EN 60950 -1 and UL/CSA
60950 -1 2
nd
Ed.
Description
The IMX35 Series of board-mountable, 35 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 9 V up to 150 V with
4 different models, the converters are available with up to four
electrically isolated outputs from 5 V to 60 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 and built according to the
international safety standards IEC/EN/UL 60950, and
approved by CSA. The converters provide basic insulation.
The circuit is comprised of 2 planar magnetics devices, and all
components are automatically assembled and securly
soldered onto a single PCB without any wire connection.
Magnetic feedback ensures maximum reliability and
repeatability in the control loop over all operating conditions.
Careful considerations of possible thermal stresses ensure the
absence of hot spots providing long life in environments, where
temperature cycles are present. The thermal design without
using any potting material allows operation at full load up to an
ambient temperature of 71 °C in free air and operation up to
105 °C with airflow. 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 ................................................................. 9
Copyright © 2015, Bel Power Solutions Inc. All rights reserved.
MELCHER
BCD20009-G Rev AD, 10-Aug-2015
The Power Partners.
Page 1 of 15
IMX35 Series Data Sheet
35 Watt Quad-Output DC-DC Converters
Model Selection
Table 1: Model Selection
Output 1
V
o nom
I
o nom
[V]
[A]
5
5
5
5
12
12
12
12
15
15
15
15
5
5
5
5
5
5
5
5
1
2
Output 2
Output 3
Output 4 Input voltage
Efficiency
1
V
o nom
I
o nom
V
o nom
I
o nom
V
o nom
I
o nom
V
i min
to
V
i max
η
min
[V]
[A]
[V]
[A]
[V]
[A]
[V]
[%]
5
5
5
5
12
12
12
12
15
15
15
15
12
12
12
12
15
15
15
15
1.35
1.4
1.4
1.4
0.65
0.7
0.7
0.7
0.55
0.6
0.6
0.6
0.65
0.7
0.7
0.7
0.55
0.6
0.6
0.6
5
5
5
5
12
12
12
12
15
15
15
15
12
12
12
12
15
15
15
15
1.35
1.4
1.4
1.4
0.65
0.7
0.7
0.7
0.55
0.6
0.6
0.6
0.65
0.7
0.7
0.7
0.55
0.6
0.6
0.6
5
5
5
5
12
12
12
12
15
15
15
15
5
5
5
5
5
5
5
5
1.35
1.4
1.4
1.4
0.65
0.7
0.7
0.7
0.55
0.6
0.6
0.6
1.35
1.4
1.4
1.4
1.35
1.4
1.4
1.4
9 to 36
18 to 75
40 to 121
60 to 150
2
9 to 36
18 to 75
40 to 121
60 to 150
2
9 to 36
18 to 75
40 to 121
60 to 150
2
9 to 36
18 to 75
40 to 121
60 to 150
2
9 to 36
18 to 75
40 to 121
60 to 150
2
82.5
82
83
82
83.7
83.7
84.5
84
85
83.6
84
83
84
84
84
83.6
84
83.5
84
84
Model
η
typ
[%]
86
87
86
86
86
88
88
88
88
89
88
88
88
89
88
88
86
89
88
88
Opt.
1.35
1.4
1.4
1.4
0.65
0.7
0.7
0.7
0.55
0.6
0.6
0.6
1.35
1.4
1.4
1.4
1.35
1.4
1.4
1.4
20IMX35D05D05-8
40IMX35D05D05-8
70IMX35D05D05-8
110IMX35D05D05-8
20IMX35D12D12-8
40IMX35D12D12-8
70IMX35D12D12-8
110IMX35D12D12-8
20IMX35D15D15-8
40IMX35D15D15-8
70IMX35D15D15-8
110IMX35D15D15-8
20IMX35D05D12-8
40IMX35D05D12-8
70IMX35D05D12-8
110IMX35D05D12-8
20IMX35D05D15-8
40IMX35D05D15-8
70IMX35D05D15-8
110IMX35D05D15-8
i
Z
G
Efficiency at
T
A
= 25 °C,
V
o nom
,
I
o nom
154 V for 2 s.
Part Number Description
Input voltage range
V
i
9 to 36 VDC
18 to 75 VDC
40 to 121 VDC
60 to 150 VDC
........................................... 20
........................................... 40
........................................... 70
......................................... 110
40 IMX35 D05 D05 -8 i Z G
Series ....................................................................... IMX35
Outputs 1 and 4 (1
st
power train) ............... D05, D12, D15
Outputs 2 and 3 (2
nd
power train) .............. D05, D12, D15
Operating ambient temperature range
T
A
= – 40 to 85 °C ...................................... - 8
Options:
Inhibit ........................................................... -i
Open frame .................................................. Z
RoHS compliant for all six substances ......... G
Note:
The sequence of options must follow the order above !
Preferred for new designs
Product Marking
Converters without option Z are marked with type designation,
input and output voltages and currents, applicable safety
approval and recognition marks, company logo, production
date, and serial no.
MELCHER
BCD20009-G Rev AD, 10-Aug-2015
The Power Partners.
Page 2 of 15
IMX35 Series Data Sheet
35 Watt Quad-Output DC-DC Converters
Functional Description
The IMX35 converters are comprised of 2 feedback-controlled
interleaved-switching flyback powertrains using current mode
PWM (pulse width modulation).
Each converter consists of 4 electrically isolated outputs
deriving from 2 power trains. Vo1, Vo4 derive from the first
powertrain and Vo2, Vo3 from the second one. Thus each pair
of outputs is independent from the other one.
Voltage regulation for each pair of outputs is achieved with
passive transformer feedback from the main transformer of the
powertrain. Each pair of outputs has the same output voltage
(i.e. D05, D12, etc.). If both powertrains have the same output
voltage (e.g. D12D12), all outputs may be simultaneously
adjusted by the Trim input (pin 5). In case of different output
voltages (e.g. D05D15), the Trim1 input influences only Vo1
and Vo4.
Current limitation is provided by the primary circuit for each
powertrain and limits the possible output power for each pair of
outputs. In the case of an overload on either of the power
trains, which causes the output voltage to fall less than typically
60% of
V
o nom
, the entire converter will shut down and
automatically restart in short intervals (hiccup mode).
The incorporated overtemperature protection shuts down the
converter in excessive overtemperature conditions with
automatic restart.
03098a
Vi+
4
16
Vo1+
PUL
1
Trim/Trim1
5
15
Vo1–
W
6
PWM
17
Vo4+
Ref
7
SD
8
18
Vo4–
Vi–
2
n.c.
3
13
Vo2+
14
Vo2–
12
Vo3+
11
Vo3–
19
n.c.
Fig. 1
Block diagram of quad-output models
MELCHER
BCD20009-G Rev AD, 10-Aug-2015
The Power Partners.
Page 3 of 15
IMX35 Series Data Sheet
35 Watt Quad-Output DC-DC Converters
Electrical Input Data
General conditions:
T
A
= 25 °C, unless specified
Pins 8 (shutdown or i), 6 (W), 5 (Trim or Trim1), and 1 (PUL) left open-circuit (not connected), unless specified.
Table 2: Input Data
Input
Characteristics
V
i
V
i nom
V
i sur
t
start-up
Input voltage range
1
Nominal input voltage
Repetitive surge voltage
Converter
Switch on
2
start-up time
S D high
¯¯
Rise time
3
Conditions
T
A min
to
T
A max
I
o
= 0 to
I
o nom
Abs. max input (3 s)
Worst case condition at
V
i min
and full load
V
i nom
resist load
I
o nom
capac. load
I
i o
I
irr
I
inr p
C
i
––
V
SD
20IMX35
min
9
2
20
40
0.25
0.5
0.1
3
6
12
70
30
8
2
–10 to 0.7
open circuit or 2 to 20
approx. 10
V
i
min
40 IMX35
max
36
min
18
2
40
100
0.25
0.5
0.1
3
6
12
50
30
9
1.3
–10 to 0.7
open circuit or 2 to 20
approx. 10
12
6
220
240
typ
max
75
Unit
typ
VDC
s
t
rise
ms
No load input current
Reflected ripple current
Inrush peak current
4
Input capacitance
Shut down voltage
I
o
= 0,
V
i min
to
V
i max
I
o
= 0 to
I
o nom
V
i
=
V
i nom
for surge calculation
Converter disabled
Converter operating
mA
mA
pp
A
µF
V
k
Ω
mA
kHz
––
R
SD
––
I
SD
Shutdown input resistance
Inputcurrentduring shutdown
Switching frequency
to
V
i max
f
s
V
i min
to
V
i max
,
I
o
= 0 to
I
o nom
220
240
Input
Characteristics
V
i
V
i nom
V
i sur
t
start-up
Input voltage range
1
70 IMX35
Conditions
T
A min
to
T
A max
I
o
= 0 to
I
o nom
Abs. max input (3 s)
Worst case condition at
V
i min
and full load
V
i nom
resist load
I
o nom
capac. load
0.25
min
40
2
70
150
0.5
0.1
3
6
12
30
30
7
0.5
–10 to 0.7
open circuit or 2 to 20
approx. 10
V
i
min
110 IMX35
max
121
min
60
2
110
170
0.4
0.7
0.1
3
6
12
20
30
7
0.5
–10 to 0.7
open circuit or 2 to 20
approx. 10
5
5
225
6
Unit
typ
typ
max
150
5
VDC
Nominal input voltage
Repetitive surge voltage
Converter
Switch on
start-up time
2
S
¯
high
¯
D
Rise time
3
s
t
rise
ms
I
i o
I
irr
I
inr p
C
i
––
V
SD
No load input current
Reflected ripple current
Inrush peak current
4
Input capacitance
Shut down voltage
I
o
= 0,
V
i min
to
V
i max
I
o
= 0 to
I
o nom
V
i
=
V
i nom
for surge calculation
Converter disabled
Converter operating
mA
mA
pp
A
µF
V
k
Ω
mA
kHz
––
R
SD
––
I
SD
Shutdown input resistance
Inputcurrentduring shutdown
Switching frequency
to
V
i max
f
s
1
V
i min
to
V
i max
,
I
o
= 0 to
I
o nom
3
4
5
6
220
240
2
V
i min
will not be as stated, if
V
o
is increased above
V
o nom
by
use of Trim input. If the output voltage is set to a higher value,
V
i min
will be proportionately increased.
Input undervoltage lockout at typ. 85% of
V
i min
.
Measured with resistive and max. admissible capacitive load.
Source impedance according to ETS 300132-2, version 4.3.
154 V during 2 s
Revision B A or later. Older converters had
f
s
≤
240 kHz.
MELCHER
BCD20009-G Rev AD, 10-Aug-2015
The Power Partners.
Page 4 of 15
IMX35 Series Data Sheet
35 Watt Quad-Output 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
4
3
2
1
0
20
40
60
80
t
100 µs
Input Transient Voltage Protection
A built-in suppressor diode provides effective protection against
input transients, which may be generated for example by short-
circuits across the input lines, where the network inductance
may cause high energy pulses.
Table 4: Built-in transient voltage suppressor
04022b
Model
Breakdown
voltage
V
Br nom
[V]
39
100
151
176
Peak power
at 1 ms
P
p
[Ω]
Ω
1500
1500
600
600
Peak pulse
current
I
pp
[A]
22
9.7
2.9
2.5
20IMX35
40IMX35
70IMX35
110IMX35
Fig. 2
Typical inrush current at V
i nom
, P
o nom
versus time (40IMX35).
Source impedance according to ETS 300132-2 at V
i 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 for IEC/EN
61000-4-5, level 2
Model
t
startup
t
V
o
V
o nom
t
rise
04008b
Inductor (L)
22 µH /5 A
68 µH / 2.7 A
100 µH / 1 A
150 µH /0.8 A
Capacitor (C)
470 µF / 40 V
2 x 100 µF /100 V
2 x 82 µF /200 V
2 x 82 µF / 200 V
Diode (D)
1.5 k E47A
-
-
-
20IMX35
40IMX35
Fig. 3
Converter start-up and rise time (see table 2)
70IMX35
110IMX35
Reverse Polarity Protection
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
20IMX35
40IMX35
70IMX35
110IMX35
Fuse type
F8.0A
F4.0A
F2.0A
F1.5A
L
Vi+
C
+
D
Vi–
04036a
Fig. 4
Example for external circuitry to comply with IEC/EN 61000-
4-5; the diode D is only necessary for 20IMX35 models.
MELCHER
BCD20009-G Rev AD, 10-Aug-2015
The Power Partners.
Page 5 of 15
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