40IMX7 [BEL]
7-Watt DC-DC Converters;
| 型号： | 40IMX7 |
| 厂家： | 
BEL FUSE INC. |
| 描述： | 7-Watt DC-DC Converters |
| 文件： | 总14页 (文件大小：480K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
IMX7, IMS7 Series Data Sheet
7-Watt DC-DC Converters
Features
• RoHS lead-free-solder and lead-solder-exempted
products are available.
• Input voltage ranges up to 150 VDC
• 1 or 2 isolated outputs up to 48 V
• 1500 to 2000 VAC voltage withstand test
• Extremely wide input voltage ranges
• Immunity according to IEC/EN 61000-4-2, -3, -4, -5, -6
• High efficiency (typ. 84%)
10.5
0.42"
25.4
1.0"
50.8
2.0"
• Input undervoltage lockout
• Inhibit input, adjustable output voltages
• Flex power: flexible load distribution on outputs
• Outputs no-load, overload, and short-circuit proof
• High reliability and no derating
• Operating ambient temperature –40 to +85 °C
• Thermal protection
• Supplementary insulation
• Planar technology for best mechanical stability
• 2” × 1” case with 10.5 mm profile
Description
The IMX7/IMS7 Series of board-mountable 7 Watt DC-DC
converters have 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 telecom, where variable
input voltages or high transient voltages are prevalent.
Safety-approved to IEC 60950-1 and UL/CSA 60950-1
2nd Ed.
1
1 70/110IMX7 models
Covering a total input voltage range from 8.4 V to 150 V with
six different models, the converters are available with single
and electrically-isolated double outputs from 3.3 up to 48 V
with flexible load distribution on double outputs. A shutdown
input allows remote on/off.
The circuitry is comprised of integral planar magnetics. All
components are automatically assembled and securely
soldered onto a single PCB without any wire connections.
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 a reality. The thermal design allows
operation at full load up to an ambient temperature of 85 °C in
free air without using any potting material. For extremely high
vibration environments the case has holes for screw mounting.
Features include efficient input and output filtering with good
transient and surge protection, low output ripple and noise,
consistently high efficiency over the entire input voltage range,
and high reliability as well as excellent dynamic response to
load and line changes.
The converters provide supplementary insulation with SELV
outputs as for instances required in battery-supported
systems, where the bus voltage may exceed the SELV limit of
60 V. The models 70IMX7 and 110IMX7 are CE-marked.
Several options, such as open-frame, provide a high level of
application-specific engineering and design-in flexibility.
Table of Contents
Page
Page
Electromagnetic Compatibility (EMC) .................................. 11
Immunity to Environmental Conditions ................................ 12
Mechanical Data .................................................................. 13
Safety and Installation Instructions ...................................... 13
Description of Options ......................................................... 14
Description ............................................................................. 1
Model Selection ..................................................................... 2
Functional Description ........................................................... 3
Electrical Input Data............................................................... 4
Electrical Output Data ............................................................ 7
Auxiliary Functions ................................................................. 9
Copyright © 2015, Bel Power Solutions Inc. All rights reserved.
MELCHER
The Power Partners.
BCD20007-G Rev AF, 31-Jul-2015
Page 1 of 14
IMX7, IMS7 Series Data Sheet
7-Watt DC-DC Converters
Model Selection
Table 1: Model Selection
Output 1
Vo1 nom Io1 nom
Output 21
Output power
Po nom
Input voltage
range
Efficiency
η min η typ
[%] [%]
Model
Options
Vo2 nom Io2 nom
[V]
[A]
[V]
[A]1
[W]
[V]
3.3
3.3
3.3
3.3
3.3
3.3
1.5
1.5
1.5
1.5
1.5
1.5
-
-
-
-
-
-
-
-
-
-
-
-
5
5
5
5
5
5
8.4 – 36
14 – 36
74
75.5
74.7
77
76
74.5
78
79
79
79
78
78
20IMX7-03-8
24IMS7-03-9
40IMX7-03-8
48IMS7-03-9
70IMX7-03-8
110IMX7-03-8
Z, G
Z, G
Z, G
Z, G
Z, G
Z, G
16.82 – 75
36 – 75
40 – 121
60 – 1502
5.1
5.1
5.1
5.1
5.1
5.1
1.2
1.2
1.2
1.2
1.2
1.2
-
-
-
-
-
-
-
-
-
-
-
-
6.1
6.1
6.1
6.1
6.1
6.1
8.4 – 36
14 – 36
75.5
77
79
78
75.5
76
78
80
81
81
78
79
20IMX7-05-8
24IMS7-05-9
40IMX7-05-8
48IMS7-05-9
70IMX7-05-8
110IMX7-05-8
M, Z, G
Z, G
M, Z, G
Z, G
M, Z, G
M, Z, G
16.82 – 75
36 – 75
40 – 121
60 – 1503
5
5
5
5
5
5
0.6
0.7
0.7
0.7
0.7
0.7
5
5
5
5
5
5
0.6
0.7
0.7
0.7
0.7
0.7
6
7
7
7
7
7
8.4 – 36
14 – 36
77
79
79.5
81.5
81
81
82
82
83
82
80
20IMX7-05-05-8
24IMS7-05-05-9
40IMX7-05-05-8
48IMS7-05-05-9
70IMX7-05-05-8
110IMX7-05-05-8
M, Z, G
Z, G
M, Z, G
Z, G
M, Z, G
M, Z, G
16.82 – 75
36 – 75
40 – 121
60 – 1503
78
12
12
12
12
12
12
0.25
0.3
0.3
0.3
0.3
0.3
12
12
12
12
12
12
0.25
0.3
0.3
0.3
0.3
0.3
6
8.4 – 36
14 – 36
80.5
81.5
82.5
82
83
80
83
85
84
84
85
83
20IMX7-12-12-8
24IMS7-12-12-9
40IMX7-12-12-8
48IMS7-12-12-9
70IMX7-12-12-8
110IMX7-12-12-8
M, Z, G
Z, G
M, Z, G
Z, G
M, Z, G
M, Z, G
7.2
7.2
7.2
7.2
7.2
16.82 – 75
36 – 75
40 – 121
60 – 1503
15
15
15
15
15
15
0.2
15
15
15
15
15
15
0.2
6
8.4 – 36
14 – 36
81
81.5
81
82
81.5
79
83
84
84
84
83
82
20IMX7-15-15-8
24IMS7-15-15-9
40IMX7-15-15-8
48IMS7-15-15-9
70IMX7-15-15-8
110IMX7-15-15-8
M, Z, G
Z, G
M, Z, G
Z, G
M, Z, G
M, Z, G
0.24
0.24
0.24
0.24
0.24
0.24
0.24
0.24
0.24
0.24
7.2
7.2
7.2
7.2
7.2
16.82 – 75
36 – 75
40 – 121
60 – 1503
24
24
24
24
24
24
0.13
0.15
0.15
0.15
0.15
0.15
24
24
24
24
24
24
0.13
0.15
0.15
0.15
0.15
0.15
6.2
7.2
7.2
7.2
7.2
7.2
8.4 – 36
14 – 36
79
82
82
82
80
81
83
84
84
84
83
84
20IMX7-24-24-8
24IMS7-24-24-9
40IMX7-24-24-8
48IMS7-24-24-9
70IMX7-24-24-8
110IMX7-24-24-8
M, Z, G
Z, G
M, Z, G
Z, G
M, Z, G
M, Z, G
16.82 – 75
36 – 75
40 – 121
60 – 1503
1
2
3
Flexible load distribution on double-outputs possible. If only one output is used, connect both outputs of double-output models in parallel.
Operation at low input voltage possible, if Po is reduced to approx. 80% of Po nom at Vi min = 14.1 V.
Up to 154 V for 2 s
NFND: Not for new designs.
Preferred for new designs
Note: Use 20IMX7 to replace 24IMS7 and 40IMX7 to replace 48IMS7.
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BCD20007-G Rev AF, 31-Jul-2015
Page 2 of 14
IMX7, IMS7 Series Data Sheet
7-Watt DC-DC Converters
Part Number Description
Input voltage range Vi
40 IMX7 - 05 - 05 -8 Z G
8.4 – 36 V .............................................. 20
14 – 36 V ............................................... 24
16.8 – 75 V ............................................ 40
36 – 75 V ............................................... 48
40 – 121 V ............................................. 70
60 – 150 V ........................................... 110
Series .............................................................. IMX7, IMS7
Output voltage of output 1...................... 03, 05, 12, 15, 24
Output voltage of output 2............................ 05, 12, 15, 24
Operating ambient temperature TA
–40 to 85 °C ............................................... -8
–40 to 71 °C ............................................... -9
Options:
Surface mount version1 ............................................ M
Open frame1 ..................................................................... Z
RoHS-compliant for all six substances ........ G
Obsolete option: C-pinout ............................................... C
1
Option M and Z exclude each other.
Note: The sequence of options must follow the order above.
Example: 40IMX7-05-05-8ZG: DC-DC converter, input voltage range 16.8 – 75 V, 2 outputs providing each 5 V, 700 mA,
temperature range –40 to 85 °C, open frame, RoHS compliant for all six substances.
03042b
Functional Description
1
11
Vi+
Vo1+
The IMX7/IMS7 Series DC-DC converters are feedback-
controlled flyback converters using current mode PWM (Pulse
Width Modulation).
4
3
Trim
i
In the case of single-output models, the output is directly
sensed and fed back to the primary control circuit via a pulse
transformer, resulting in tight regulation of the output voltage.
The R input is referenced to the secondary side and allows for
programming the output voltages in the range 75 to 105% of
10
13
Vo1–
Vo2+
PWM
Vo nom, using either an external resistor or an external voltage
2
12
14
source.
Vo2–
n.c.
Vi–
For double-output models, the output voltage is sensed by a
separate transformer winding close to the secondary and fed
2 × 2200 pF
03025a
Fig. 2
Block diagram of double-output models
1
11
Vi+
Vo+
back to the primary control circuit. Close magnetic coupling is
provided by the planar construction, ensuring very good
regulation, and allowing for flexible load distribution. The Trim
input of double-output models is referenced to the primary side,
and allows for programming the output voltages in the range of
100 to 105% of Vo nom by means of an external resistor, or within
75 to 100% of Vo nom, using an external voltage source.
PWM
3
i
10
12
Vo–
2 × 2200 pF
1500 V
2
4
Vi–
Current limitation is provided by the primary circuit, thus limiting
the total output current (Io nom for the single- and the sum Io1 nom
+ Io2 nom for double-output models).
13
14
R
n.c.
n.c.
The inhibit input i allows remote control of the outputs; pin i
must be connected to Vi– to activate the converter.
Fig. 1
Block diagram of single-output models
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BCD20007-G Rev AF, 31-Jul-2015
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IMX7, IMS7 Series Data Sheet
7-Watt DC-DC Converters
Electrical Input Data
General conditions:
– TA = 25 °C, unless TC is specified.
– Connector pin i connected with Vi–.
– Trim or R input not connected.
Table 2a: Input data of IMX7
Input
20IMX7
40IMX7
70IMX7
110IMX7
Unit
Characteristics
Conditions
min typ max min typ max min typ max min typ max
Vi
Input voltage range1
TC min – TC max
Io = 0 – Io nom
8.4
36 16.8 6
75
40
121 60
1507
V
Vi nom Nominal input voltage
20
40
70
110
Vi sur
Repetitive surge voltage
abs. max input (3 s)
50 5
100
150
tstart up Converter 2
switch on
Worst case condition at
0.25 0.5
0.25 0.5
0.25 0.5
0.25 0.5
s
start-up time
Vi min and full load
inh. release
0.1
0.1
0.1
0.1
trise
Rise time 2
Vi nom
Io nom
resistive load
5
5
5
5
ms
capacitive load
12
12
12
12
Ii o
No load input current
Input capacitance
Inhibit voltage
Io = 0, Vi min – Vi max
(for surge calculation)
converter operating
converter inhibited
15
30
8
15
8
15
8
15
mA
µF
V
Ci
4.7
0.5
0.2
0.2
Vinh
–10
2.4
+0.8 –10
+0.8 –10
+0.8 –10
+0.8
Vi max 2.4
Vi max 2.4
Vi max 2.4
Vi max
or open
–0.5
1
or open
–0.5
1
or open
–0.5
1
or open
–0.5
1
Iinh
Inhibit current
converter operating
converter inhibited
Vi min – Vi max
mA
Ii inh
Input current when the
converter is inhibited
3
3
3
3
4
Iinr p
fs
Inrush peak current
Vi = Vi nom
3.8
3.7
4.2
5.6
A
Switching frequency
Vi min – Vi max, Io = 0 – Io nom
Io = 0 – Io nom
approx. 400
50
approx. 400
30
approx. 400
20
approx. 300
kHz
Ii rr
Reflected ripple current
Input RFI level conducted
10 mApp
Vi RFI
EN 55022 3
A
A
A
A
1
Vi min will not be as stated, if Vo is increased above Vo nom by use of the R or Trim input. If the output voltage is set to a higher value, Vi min
will be proportionally increased.
Measured with a resistive and the max. admissible capacitive load.
Measured with a lead length of 0.1 m, leads twisted. Double-output models with both outputs in parallel. 70/110 IMX7 models need an
external capacitor at the input, e.g., 1 µF film or ceramic.
2
3
4
5
6
7
Source impedance according to ETS 300132-2, version 4.3, at Vi nom
.
The DC-DC converter shuts down automatically at approx. 38 V.
Operation at lower input voltage possible: Po approx. 80% of Po nom at Vi min = 14.4 V.
Up to 154 V for 2 s
Vo
trise
04008a
Vo nom
t
tstart up
Fig. 3
Converter start-up and rise time
MELCHER
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BCD20007-G Rev AF, 31-Jul-2015
Page 4 of 14
IMX7, IMS7 Series Data Sheet
7-Watt DC-DC Converters
Table 2b: Input data of IMS7; general conditions as in table 2a
Input
24IMS7
typ
48IMS7
typ
Unit
Characteristics
Conditions
min
max
min
max
Vi
Input voltage range1
TC min – TC max
Io = 0 – Io nom
14
36
36
75
V
Vi nom Nominal input voltage
24
48
Vi sur
Repetitive surge voltage
abs. max input (3 s)
50
0.6
0.1
100
0.6
0.1
tstart up Converter 2
switch on
Worst case condition at
Vi min and full load
0.4
0.3
s
start-up time
inh. release
trise
Rise time 2
Vi nom
Io nom
resistive load
5
5
12
6
ms
capacitive load
12
12
0.8
Ii o
No load input current
Input capacitance
Inhibit voltage
Io = 0, Vi min – Vi max
(for surge calculation)
converter operating
converter inhibited
24
12
mA
µF
V
Ci
0.5
Vinh
–10
2.4
+0.8
–10
2.4
+0.8
Vi max
Vi max
or open
–0.5
1
or open
–0.5
1
Iinh
Inhibit current
converter operating
converter inhibited
Vi min – Vi max
mA
Ii inh
Input current when the
converter is inhibited
3
3
4
Iinr p
fs
Inrush peak current
Vi = Vi nom
4.0
3.9
A
Switching frequency
Reflected ripple current
Input RFI level conducted
Vi min – Vi max, Io = 0 – Io nom
Io = 0 – Io nom
approx. 330
approx. 330
kHz
mApp
Ii rr
40
30
Vi RFI
EN 55022 3
A
A
1
Vi min will not be as stated, if Vo is increased above Vo nom by use of the R or Trim input. If the output voltage is set to a higher value, Vi min
will be proportionally increased.
Measured with a resistive and the max. admissible capacitive load.
Measured with a lead length of 0.1 m, leads twisted. Double-output models with both outputs in parallel. 70/110 IMX7 models need an
external capacitor at the input, e.g. 1 µF film or ceramic.
Source impedance according to ETS 300132-2, version 4.3, at Vi nom
2
3
4
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IMX7, IMS7 Series Data Sheet
7-Watt DC-DC Converters
Note: Suppressor diode D is only necessary for 20IMX7 models.
To withstand 150 V transients according to 19 Pfl 1, applicable for
40IMX7 models, the same external circuitry with similar
components as for IEC/EN 61000-4-5, level 2 compliance can be
used.
Input Transient Voltage Protection
In many applications transient voltages on the input of the
converter may occur and are possibly caused by short circuits
between Vi+ and Vi–, where the network inductance may
cause high energy pulses.
Input Fuse and Reverse Polarity Protection
In order to protect the converters, transient suppressors are
fitted to the input; see table below:
The suppressor diode on the input also provides for reverse
polarity protection by conducting current in the reverse
direction, thus protecting the converter. An external fuse is
required to limit this current. We recommend for:
Table 3: Built-in transient voltage suppressor
Model
Breakdown
Voltage
VBR nom
Peak Power
at 1 ms
PP
Peak Pulse
Current
IPP
– 20IMX7 and 24IMS7 a fast 2 A (F2A) fuse
– 40IMX7 and 48IMS7 a fast 1 A (F1A) fuse
– 70IMX7 a fast 0.63 A (F.63A) fuse
20IMX71
24IMS7 2
40IMX72
48IMS7 2
70IMX72
110IMX72
overvoltage lockout at approx. 38 V
– 110IMX7 a fast 0.63 A (F.63A) fuse.
53 V
600 W
1500 W
600 W
600 W
600 W
7.7 A
100 V
100 V
144 V
167 V
11 A
4.1 A
2.9 A
2.5 A
Inrush Current
The inrush current has been kept as low as possible by
choosing a very small input capacitance. A series resistor may
be inserted in the input line to limit this current further.
1
The built-in overvoltage trigger shuts down the converter at
approx. 38 V protecting the input up to 50 V. For higher transient
voltages an external suppressor or voltage limiting circuit as, e.g.,
for IEC/EN 61000-4-5, level 2 compliance should be provided.
A
04030a
4
3
2
If transients generating currents above the peak pulse current are
possible, an external limiting network such as the circuit
recommended for IEC/EN 61000-4-5, level 2 compliance, is
necessary.
2
1
0
To achieve IEC/EN 61000-4-5, level
2 compliance, an
0
20
40
60
80 µs
additional inductor and capacitor should be provided externally
as shown in the figure below. The components should have
similar characteristics as listed in table 4.
Fig. 5
Typical inrush current at Vi nom, Po nom measured according to
ETS 300132-2 (40IMX7).
07064
L
Vi+
+
i
C
D
Vi–
Fig. 4
Example for external circuitry to comply with IEC/EN
61000-4-5, level 2 (transzorb D only for 20IMX7).
Table 4: Components for external circuitry to comply with
IEC/EN 61000-4-5, see table 8
Model
L
C
D
20IMX7
24IMS7
40IMX7
48IMS7
70IMX7
110IMX7
330 µH, 1 A, 0.115 Ω
68 µF, 63 V 1.5KE39A
–
–
–
330 µH, 0.6 A, 0.42 Ω
47 µF, 100 V 1.5KE100A
–
–
–
1000 µH, 0.6 A, 0.42 Ω 22 µF, 160 V 1.5KE120A
330 µH, 0.2 A 22 µF, 200 V 1.5KE170A
MELCHER
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BCD20007-G Rev AF, 31-Jul-2015
Page 6 of 14
IMX7, IMS7 Series Data Sheet
7-Watt DC-DC Converters
Electrical Output Data
General conditions:
– TA = 25 °C, unless TC is specified.
– Pin i connected with Vi–; Trim or R input left open-circuit.
Table 5a: Output data for single-output models
Output
Vo nom
3.3 V
5.1 V
Unit
Characteristics
Conditions
Vi nom
min typ max min typ max
Vo
Output voltage setting
3.28
1.78
3.32 5.07
5.13
V
A
Io nom Output current (nom.)
Vi min – Vi max
Vi nom
1.5
1.2
Io L
Current limit2
2.7 1.56
±1
2.0
±1
∆Vo
Line and load regulation
Vi min – Vi max
%
Io = (0.05 – 1)Io nom
5
6
vo
Output voltage noise
other models
110IMX7
Vi min – Vi max
Io = Io nom
70
70
40
mVpp
20
40
40
20
40
50
50
Vo clp Output overvoltage limit 7
Minimum load 1%
115
130 115
130
%
Admissiblecapacitiveload
0
2500
0
2000
µF
Co ext
Vo d
td
Dynamic Voltage deviat. Vi nom
±250
1
±250
1
mV
ms
1
load
regulation
I
o nom ↔ / Io nom
2
Recovery time
αVo
Temperature coefficient
Vi min – Vi max
±0.02
±0.02
%/K
∆Vo/∆TC (TC min to TC max
)
Io = (0.05 – 1)Io nom
Table 5b: Output data for double-output models
Output
Vo nom
2 × 5 V
2 × 12 V
2 ×15 V
2 × 24 V
Unit
Characteristics
Conditions
min typ max min typ max min typ max min typ max
Vo1
Vo2
Output voltage
setting
IMX7 Vi nom
4.96
5.04 11.90
5.05 11.88
12.10 14.88
12.12 14.85
15.12 23.81
15.15 23.75
24.19
24.25
V
Io1 = Io2 = 0.5 Io nom 4.95
Vo1
Vo2
IMS7 Vi nom
4.92
5.08 11.82
5.08 11.82
12.18 14.78
12.18 14.78
15.22 23.64
15.22 23.64
24.36
24.36
Io1 = Io2 = 0.5 Io nom 4.92
Io nom Output current
20IMX7 Vi min – Vi max
other models
20IMX7 Vi nom
other models
2 × 0.6
2 × 0.7
2 × 0.25
2 × 0.3
2 × 0.2
2 × 0.24
2 × 0.13
2 × 0.15
A
(nom.)1
Io L
Current
1.8
1.8
2.1
2.0
±1
±3
80
40
0.7
0.8
0.9 0.5
1.0 0.55
±1
0.7 0.35
0.9 0.38
±1
0.45
0.5
±1
3
limit 2
∆Vo1 Line regulation
Vi min – Vi max, Io nom
Vi nom , (0.1–1)Io nom
%
∆Vo l Load regulation 4
±3
±3
±3
5
vo1, 2 Output voltage noise
Vi min – Vi ma
Io = Io nom
120
150
240 mVpp
50 100
130
100
6
20
25
50
30
60
Vo clp Output overvoltage limit 7
Co ext Admissiblecapacitiveload3
Minimum load 1% 115
0
130 115
2000
130 115
130 115
%
µF
mV
0
300
0
200
0
Vo d
td
Dynamic Voltage deviat. Vi nom
±150
1
±330
1
±350
1
±600
1
1
load
I
o nom ↔ / Io nom
2
Recovery time
ms
regulation
αVo
Temperature coefficient
of output voltage
Vi min – Vi max
(0.05 –1)Io nom
±0.02
±0.02
±0.02
±0.02
%/K
1
Each output is capable of delivering full output power Po nom according to table Model Selection.
The current limit is primary side controlled. Io L is defined when Vo dropped to 85 to 94%.
Measured with both outputs connected in parallel.
2
3
4
5
6
7
Conditions for specified output. Other output loaded with constant current Io = 0.5 Io nom
.
BW = 20 MHz
Measured with a probe according to EN 61204.
The overvoltage protection is not tracking with the R control.
MELCHER
The Power Partners.
BCD20007-G Rev AF, 31-Jul-2015
Page 7 of 14
IMX7, IMS7 Series Data Sheet
7-Watt DC-DC Converters
Output Overvoltage Protection
Thermal Considerations
The outputs are protected against overvoltage by Zener diodes.
In the event of an overvoltage, the converter will shut down and
attempt to restart automatically. The main purpose of this
feature is to protect against possible overvoltage, which could
occur due to a failure in the feedback control circuit. The
converters are not designed to withstand external overvoltages
applied to the outputs.
If the converter, mounted on a PCB, is located in free, quasi-
stationary air (convection cooling) at the maximum ambient
temperature TA max (see table Temperature specifications) and
is operated at nominal input voltage and output power, the
case temperature TC measured at the measuring point of case
temperature (see Mechanical Data) will approach TC max after
the warm-up phase. However, the relationship between TA and
TC depends heavily on the conditions of operation and
integration into a system, such as input voltage, output current,
airflow, temperature of surrounding components and surfaces,
and the properties of the printed circuit board. TA max is
therefore only an indicative value, and under practical
operating conditions, TA may be higher or lower.
Connection in Series or Parallel
The outputs of single- or double-output models can be
connected in series without any precautions, taking into
consideration that the output voltage should remain below 60 V
for SELV operation.
Caution: The case temperature TC measured at the measuring
point of case temperature (see Mechanical Data) may under no
circumstances exceed the specified maximum. The installer must
ensure that under all operating conditions TC remains within the
limits stated in the table Temperature specifications.
Both outputs of double-output models can be connected in
parallel without any precautions. Several converters (single- or
double-output models) with equal output voltage can be put in
parallel and will share their output current quite equally.
However, this may cause start-up problems and is only
recommended in applications, where one converter is able to
deliver the full load current, e.g., in true redundant systems.
Po/Po max
JM017
Vo [V]
1.0
0.8
05087a
5.5
0.5 m/s
= 100 LFM
5.0
4.5
4.0
3.5
3.0
0.6
natural cooling
0.4
0.2
0
TA
20
40
60
80
100
°C
Fig. 6
0
0.8
1.2
1.6
0.4
Io [A]
Maximum allowed output power versus ambient temperature
Fig. 8a
Short-Circuit Behavior
Vo versus Io (typ.) of single-output models with Vo = 5.1 V
The current limitation shuts down the converter, when a short
circuit is applied to the output. It acts self-protecting, and
automatically recovers after removal of the overload condition.
Vo [V]
05086b
13
12
11
10
9
Vo [%]
overload short-circuit condition
100
switch-off
05041b
70
8
7
0
0.2
0.4
0.6
0.8
Io total [A]
t
0
0.3 s
Fig. 8b
Fig. 7
Vo versus Io (typ.) of double-output models (2 ×12 V) with both
outputs in parallel
Overload switch-off (hiccup mode).
MELCHER
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BCD20007-G Rev AF, 31-Jul-2015
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IMX7, IMS7 Series Data Sheet
7-Watt DC-DC Converters
η [%]
Typical Performance Curves
05052a
90
Vo1 [V]
Vi nom
Vi max
Vi min
05088a
80
70
13.5
13
12.5
Io2 = 0.03 A
Io2 = 0.3 A
60
50
12
11.5
11
Po
40
25
50
100 %
Po
75
nom
0.15 0.20
0.25
0.3
Io1 [A]
0.05 0.10
Fig. 11
Fig. 9
Efficiency versus input voltage and load.
Typical values (40IMX7-12-12-8).
Cross load regulation (typ.) of double-output models (2×12
V). The cross-load effect is negligible.
Vo1, Vo2 [V]
05059a
12.8
12.4
12
Vo2
Vo1
11.6
Io1
Io1 nom
[%]
11.2
60
90
120
150
0
30
Fig. 10
Flexible load distribution on double-outputs models (2 ×12 V)
with load variation from 0 to 150% of Po1 nom on output 1.
Output 2 loaded with 25% of Po2 nom
.
Auxiliary Functions
Adjustable Output Voltage
As a standard feature, all IMX7 and IMS7 converters offer
adjustable output voltage(s) by using a control pin. If this pin is
left open-circuit, the output voltage is set to Vo nom. The output
voltage is adjustable in the range of 75 to 105% of Vo nom.The
circuit works for single- and double-output models in a different
way. For output voltages Vo > Vo nom, the minimum input voltage
Inhibit Function
The output(s) of the converter may be enabled or disabled by
means of a logic signal (TTL, CMOS, etc.) applied to the inhibit
pin. No output voltage overshoot will occur, when the converter
is turned on. If the inhibit function is not required, the inhibit pin
should be connected to Vi– to enable the output (active low
logic, fail safe).
Vi min (see Electrical Input Data) increases proportionally to V /
o
V
o nom
.
Converter operating:
Converter inhibited
–10 V to 0.8 V
or inhibit pin i left open: 2.4 V to Vi max (20/40IMX7,
24/48IMS7)
2.4 V to 75 V
(70/110IMX7)
MELCHER
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BCD20007-G Rev AF, 31-Jul-2015
Page 9 of 14
IMX7, IMS7 Series Data Sheet
7-Watt DC-DC Converters
Single-output models with R-input:
100 to 105% Vo nom. Rext should be connected between pin
4 and Vi–. The following table indicates suitable resistor
values for typical output voltages under nominal
conditions (Vi nom, Io = 0.5 Io nom), with paralleled outputs or
equal load conditions on each output.
The R-input (pin 13) is referenced to the secondary side of the
converter. Adjustment of the output voltage is possible by
means of either an external resistor or a voltage source.
Caution: Connection of Rext to Vi+ may damage the converter.
06029e
Vi+
Vo+
06089a
Rext2
Vi+
Vo1+
Vo1–
Vo2+
4 kΩ
Vref = 2.5 V
R
Trim
+
+
–
Control
logic
+
–
Vext
Rext1
Control
circuit
Vref 2.5 V
Vext
Rext
Vi–
Vo–
Vi–
Vo2–
Fig. 12
Fig. 13
Output voltage adjust for single-output models
Output voltage adjust for double-output models
a) Adjustment by means of an external resistor:
Table 6: Rext for Vo > Vo nom
approximate values (Vi nom, Io1 = Io2 = 0.5 Io1/2 nom
Depending upon the value of the required output voltage,
a resistor Rext1 or Rext2 shall be connected as shown in the
figure below:
Either: Rext1 between the R pin and Vo– to achieve an
output voltage adjustment range of Vo = 75 to 100% of
)
Vo [% Vo nom
]
R
ext [kΩ]
105 to 108 (107 typically)
0
105
104
103
102
101
100
1.5
5.6
12
27
68
∞
Vo nom (85 to 100% for 3.3 V outputs):
Vo
o nom – Vo
R
ext1 ≈ 4 kΩ • –––––––––
V
or: Rext2 between the R pin and Vo+ to achieve an output
voltage range of approximately Vo = 100 to 105% of Vo nom
(V – 2.5 V)
:
Note: Applying a control voltage greater than 20 V will set the
converter into a hiccup mode.
R
ext2 ≈ 4 kΩ • ––––––o––––––––––––
2.5 V • (Vo/Vo nom – 1)
b) Adjustment by means of an external voltage Vext between
Vo– and R pin.
b) Adjustment by means of an external voltage source Vext
.
For external output voltages in the range of 75 to 105% of
Vo nom a voltage source Vext (0 to 20 V) is required,
connected to the Trim-input (pin 4) and Vi–. The table
below indicates typical Vo versus Vext values under
nominal conditions (Vi nom, Io = 0.5 Io nom), with paralleled
outputs or equal load conditions on each output. Direct
paralleling of the Trim-inputs of converters connected in
parallel is feasible.
The control voltage is 1.96 to 2.62 V and allows for
adjustment in the range of 75 to 105% of Vo nom
.
Vo • 2.5 V
V
ext ≈ ––––––––
Vo nom
Caution: Applying an external voltage >2.75 V may damage the
converter.
Note: Attempting to adjust the output below this range will cause
the converter to shut down (hiccup mode).
Table 7: Vext for Vo = 75 to 105% Vo nom
;
typical values (Vi nom, Io1 = Io2 = 0.5 Io1/2 nom
)
Double-output models with Trim input:
Vo [% Vo nom
]
Vext [V]
The Trim input (pin 4) of double-output models is referenced to
the primary side. Figure 13 shows the circuitry. Adjustment of
the output voltage is possible in the range of 100 to 105% of V
≥105
102
95
0
1.6
4.5
9
o
nom using an external resistor, or in the range of 75 to 105% of
85
Vo nom using an external voltage source.
75
13
a) Adjustment by means of an external resistor Rext
.
Programming of the output voltage by means of an
external resistor Rext1 is possible within a limited range of
MELCHER
The Power Partners.
BCD20007-G Rev AF, 31-Jul-2015
Page 10 of 14
IMX7, IMS7 Series Data Sheet
7-Watt DC-DC Converters
typically occur in many installations, but especially in battery-
driven mobile applications.
Electromagnetic Compatibility (EMC)
A suppressor diode together with an input filter form an
effective protection against high input transient voltages, which
Electromagnetic Immunity
Table 8: Immunity type tests
Phenomenon
Standard
Class
level
Coupling
mode1
Value
applied
Waveform
Source
imped.
Test
procedure
In
Perf-
oper. crit.2
Electrostatic
discharge
to case5
IEC/EN
61000-4-2
2
3
contact discharge
air discharge
antenna
4000 Vp
8000 Vp
1/50 ns
330 Ω
10 positive and
10 negative
discharges
yes
B
Electromagnetic IEC/EN
field
36
23
10 V/m
3 V/m3
AM 80%
1 kHz
n.a.
n.a.
80 – 1000 MHz
yes
yes
A
A
ENV 50204
3
23
antenna
10 V/m
3 V/m3
PM, 50% duty
cycle, 200 Hz
repetition frequ.
900 MHz
Electrical fast
transients/burst
IEC/EN
61000-4-4
4
33
direct +i/–i
4000 Vp bursts of 5/50 ns
2000 Vp 5 kHz repet. rate,
50 Ω
60 s positive,
60 s negative
transients per
coupling mode
yes
B
3
transients with
15 ms burst
duration, and
300 ms period
Surges
IEC/EN
61000-4-5
2 4
+i/–i
+i/–i
1000 Vp
500 Vp
1.2/50 µs
42 Ω
0.5 µF
5 pos. and 5 neg.
surges
yes
yes
B
A
3
13 4
RF conducted
immunity
IEC/EN
61000-4-6
3
23
10 VAC
3 VAC
AM modul. 80%
1 kHz
50 Ω
0.15 to 80 MHz
150 Ω
1
i = input, o = output
2
3
4
5
6
Performance criterion: A = normal operation, no deviation from specifications, B = temporary deviation from specs possible
Valid for 24IMS7 and 48IMS7
External components required
R or Trim pin open, i pin connected with Vi–
Corresponds to the railway standard EN 50121-3-2:2000, table 9.1
Electromagnetic Emissions
Date: 5.9.07
40IMX7-24-24-8 Peak
Time: 08:00
PMM 8000 PLUS
Name: 40_7_24
Date: 5.9.07
Time: 08:18
PMM 8000 PLUS
Name: 20_7_15
dbµV
80
20IMX7-15-15-8 Peak
dbµV
80
EN 55022 A
EN 55022 A
60
40
60
40
20
0
20
0
0.2
0.5
1
2
5
10
20 MHz
0.2
0.5
1
2
5
10
20 MHz
Fig. 14a
Fig. 14b
40IMX7-24-24-8: Typical conducted emissions (peak) at the
input at Vi nom and Io nom according to EN 55011/22. Output
leads 0.1 m, twisted. External input capacitor (1 µF ceramic +
47 µF electrolytic cap)
20IMX7-15-15-8: Typical conducted emissions (peak) at the
input at Vi nom and Io nom according to EN 55011/22. Output
leads 0.1 m, twisted. External input capacitor (1 µF ceramic +
100 µF electrolytic cap)
MELCHER
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BCD20007-G Rev AF, 31-Jul-2015
Page 11 of 14
IMX7, IMS7 Series Data Sheet
7-Watt DC-DC Converters
Date: 5.9.07
110IMX7-05-8 Peak
Time: 08:00
PMM 8000 PLUS
Name: 110_7_05
Date: 5.9.07
48IMS7-15-15-8 Peak
Time: 09:10
PMM 8000 PLUS
Name: 48_7_15
dbµV
80
dbµV
80
EN 55022 A
EN 55022 A
60
40
60
40
20
0
20
0
0.2
0.5
1
2
5
10
20 MHz
0.2
0.5
1
2
5
10
20 MHz
Fig. 14c
Fig. 15
110IMX7-05-8: Typical conducted emissions (peak) at the
input at Vi nom and Io nom according to EN 55011/22. Output
leads 0.1 m, twisted. External input capacitor (0.15 µF
ceramic + 4.7 µF electrolytic cap).
48IMS7-15-15-8: Typical conducted emissions (peak) at the
input at Vi nom and Io nom according to EN 55011/22. Output
leads 0.1 m, twisted. External input capacitor (1 µF ceramic +
47 µF electrolytic cap).
Immunity to Environmental Conditions
Table 9: Mechanical and climatic stress
Test Method
Standard
Test conditions
Status
Cab
Damp heat
steady state
IEC/EN 60068-2-78
MIL-STD-810D section 507.2
Temperature:
Relative humidity:
Duration:
40 ±2 °C
Converter
not
operating
93 +2/-3
%
56 days
Ea
Shock
(half-sinusoidal)
IEC/EN 60068-2-271
MIL-STD-810D section 516.3
Acceleration amplitude:
Bump duration:
100 gn = 981 m/s2
6 ms
Converter
operating
Number of bumps:
18 (3 each direction)
Eb
Bump
(half-sinusoidal)
IEC/EN 60068-2-29
MIL-STD-810D section 516.3
Acceleration amplitude:
Bump duration:
40 gn = 392 m/s2
6 ms
Converter
operating
Number of bumps:
6000 (1000 each direction)
Fc
Vibration
(sinusoidal)
IEC/EN 60068-2-6
IEC/EN 60068-2-64
IEC/EN 60068-2-52
Acceleration amplitude:
0.35 mm (10 to 60 Hz)
Converter
5 gn = 49 m/s2 (60 to 2000 Hz) operating
10 to 2000 Hz
Frequency (1 Oct/min):
Test duration:
7.5 h (2.5 h each axis)
Fh
Kb
Vibration,
broad-band
random
Acceleration spectral density: 0.05 gn2/Hz
Converter
operating
Frequency band:
Acceleration magnitude:
Test duration:
10 to 500 Hz
4.9 gn rms
3 h (1 h each axis)
(digital control)
Salt mist, cyclic
(sodium chloride
NaCl solution)
Concentration:
Duration:
Storage:
Storage duration:
Number of cycles:
5% (30 °C)
Converter
not
operating
2 h per cycle
40 °C, 93% rel. humidity
22 h per cycle
3
1
Covers also EN 50155/EN 61373 category 1, class B, body mounted (= chassis of coach)
Temperatures
Table 10: Temperature specifications, valid for air pressure of 800 to 1200 hPa (800 to 1200 mbar)
Temperature
-9
-8
Unit
Characteristics
Conditions
Operational 1
min
–40
–40
max
71
min
–40
–40
max
85
TA
TC
Ambient temperature
°C
Case temperature
95
105
TS
Storage temperature
Non operational
–55
100
–55
105
1
See Thermal Considerations
MELCHER
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BCD20007-G Rev AF, 31-Jul-2015
Page 12 of 14
IMX7, IMS7 Series Data Sheet
7-Watt DC-DC Converters
Failure Rates
Table 11: MTBF and device hours
Model
Standard
Ground benign
Ground fixed
Ground mobile
Unit
TC = 40 °C
TC = 40 °C
TC = 70 °C
TC = 50 °C
24IMS7-05-9
MIL-HDBK-217F
MIL-HDBK-217F
Bellcore
634 000
851 000
321 000
395 000
188 000
271 000
342 000
409 000
447 000
h
40IMX7-12-12-8
253 000
809 000
871 000
3 019 000
3 320 000
1 510 000
1 660 000
40IMX7-05-05-8
Bellcore
0.8 × 1.2 (0.03 × 0.05") pins
1.6 (0.06) PCB holes
Mechanical Data
50.8 (2")
3.81(0.15")
Dimensions in mm (inches).
Tolerances ±0.3 mm,
3.4 (0.13")
European
Projection
S09030b
unless otherwise noted.
Material: PPS Fortron 1140L6
14
10
1
4
Weight: <20 g
4.6 (0.18")
Fig. 16
3.81(0.15")
45.7 (1.8")
PT 2.2
self tapping screws
Case IMX7/IMS7 with
standard pinout
Measuring point
of case temperature TC
48 (1.9")
50.8
0.8 × 1.2 Pins
09031a
S90002b
3.81
14
14
1
3.81
1
Bottom view
Bottom view
5.08
5.08
3.81
3.81
3.81
10
10
5.08
3.81
4
4
3.5 0.1 (0.14")
43.2 (1.7")
42.4
TC Z
Measuring point
case temper. TC
Core
4.2
Fig. 18
1.2 (0.5")
Fig. 17
Open-frame
model (option Z)
SMD pins (option M)
Table 12: Pin allocation
Safety and Installation Instructions
Pin
1
Single output
Double output
Pin Allocation
Vi+
Vi–
i
Vi+
Vi–
2
10011
3
i
14
1
4
n.c.
Vo–
Vo+
Vo–
R
Trim
Vo1–
Vo1+
Vo2–
Vo2+
n.c.
13
12
11
10
2
3
4
Bottom view
10
11
12
13
14
Fig. 19
n.c.
Footprint
MELCHER
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BCD20007-G Rev AF, 31-Jul-2015
Page 13 of 14
IMX7, IMS7 Series Data Sheet
7-Watt DC-DC Converters
Protection Degree and Cleaning Liquids
Installation Instruction
The protection degree of the converters is IP 30, except open-
frame models (option Z).
Installation of the converters must strictly follow the national
safety regulations in compliance with the enclosure, mounting,
creepage, clearance, casualty, markings, and segregation
requirements of the end-use application.
In order to avoid possible damage, any penetration of cleaning
fluids should be prevented, since the power supplies are not
hermetical sealed.
Connection to the system shall be made via a printed circuit
board; see Mechanical Data.
However, open-frame models (option Z) leave the factory
unlacquered; they may be lacquered by the customer, for
instance together with the mother board. Cleaning agents are
not permitted – except washing at room temperature with
isopropyl alcohol. If necessary, the mother board must be
cleaned, before fitting the open-frame converter.
The converters should be connected to a secondary circuit.
Do not open the converter.
Ensure that a converter failure does not result in a hazardous
conditions.
Note: Cleaning liquids may damage the adhesive joints of the
ferrite cores.
To prevent excessive current flowing through the input lines in
case of a short-circuit, an external fuse specified in section
Input Fuse and Reverse Polarity Protection should be installed Isolation
in the non-earthed input supply line.
The electric strength test is performed in the factory as a routine
test in accordance with EN 50514 and IEC/EN 60950, and
should not be repeated in the field. The Company will not honor
any warranty claims resulting from electric strength field tests.
Standards and Approvals
The converters are approved according to IEC 60950-1 and UL/
CSA 60950-1 2nd Edition.
The converters have been evaluated for:
• Building-in
Table 12: Electric strength test voltages
• Basic insulation input to output, based on their maximum
input voltage
• Pollution degree 2 environment
• Connecting the input to a secondary circuit, which is
subject to a maximum transient rating of
Characteristic
Input to output
20/40IMX 20/40IMX2 110IMX
24/48IMS 70IMX
o/o3
Unit
Factory test >1 s
Equivalent DC volt.
1.2
(1.5)
1.2
1.51
(2.1)
1.2
2.0
(2.5)
1.2
0.1
0.15
–
kVAC
kVDC
nF
- 1500 V for 20IMX7, 24IMS7, 40IMX7, 48IMS7
- 2000 V for 70IMX7
- 2500 V for 110IMX7.
Coupling
capacitance
The converters are subject to manufacturing surveillance in
accordance with the above mentioned standards.
Insulation resist.
at 500 VDC
>100
>100
>100
–
MΩ
1
1.5 kVAC according to IEC 60950, sect. 6.2, Telecom equipment;
type test with 1.5 kVAC / 60 s (IEE 802.3).=
20/40IMX7 produced 2014 or later.
Railway Applications
2
3
To comply with railway standards, all components are coated
with a protective lacquer (except option Z).
The test voltage between outputs is not applied as routine test.
necessary or in the case that the motherboard should be
lacquered after fitting the converter; see Cleaning Liquids.
Description of Options
Option M: SMD pins
Option G: RoHS-6
This option allows surface mounting of the converters.
Converters with a type designation ending by G are RoHS-
compliant for all six substances.
Option Z: Open Frame
For applications, where the protection by a housing is not
NUCLEAR AND MEDICALAPPLICATIONS - These products are not designed or intended for use as critical components in life support systems,
equipment used in hazardous environments, or nuclear control systems.
TECHNICAL REVISIONS - The appearance of products, including safety agency certifications pictured on labels, may change depending on the
date manufactured. Specifications are subject to change without notice.
Copyright © 2015, Bel Power Solutions Inc. All rights reserved.
www.belpowersolutions.com/power
MELCHER
The Power Partners.
BCD20007-G Rev AF, 31-Jul-2015
Page 14 of 14
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