IMX7/IMS7 DC-DC 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
• 1200 to 2000 VAC I/O electric strength test
• Extremely wide input voltage ranges
• Immunity according to IEC/EN 61000-4-2, -3, -4, -5, -6
• High efficiency (typ. 84%)
• 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
25.4
1.0"
10.5
0.42"
• 2” × 1” case with 10.5 mm profile
50.8
2.0"
Safety according to IEC/EN 60950 and UL 60950
1
1 70/110IMX7 models
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 prevailent.
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.
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
Table of Contents
60 V. The converters have been approved by UL. In addition,
70IMX7 and 110IMX7 models are CE-marked.
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.
Several options, such as open-frame, provide a high level of
application-specific engineering and design-in flexibility.
Page
Page
Description ............................................................................. 1
Model Selection ..................................................................... 2
Functional Description ........................................................... 3
Electrical Input Data ............................................................... 4
Electrical Output Data ............................................................ 7
Auxiliary Functions ................................................................. 9
Electromagnetic Compatibility (EMC) .................................. 11
Immunity to Environmental Conditions ................................ 12
Mechanical Data .................................................................. 13
Safety and Installation Instructions ...................................... 13
Description of Options ......................................................... 14
EC Declaration of Conformity .............................................. 15
BCD20007-G Rev AD, 4-Nov-09
Page 1 of 15
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IMX7/IMS7 DC-DC Series Data Sheet
7-Watt DC-DC Converters
®
Model Selection
Table 1: Model Selection
Output 1
Vo1 nom Io1 nom
[ V]
[A] 1
1
2
3
4
Output 2
Vo2 nom
Io2 nom
[ V]
[A] 1
Output power
Po nom
[W ]
Input voltage
range
[ V]
Efficiency
η typ
[%]
Model
Options 2
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
16.8 – 75 3
36 – 75
40 – 121
60 – 150
79
79
81
79
79
79
20IMX7-03-8
24IMS7-03-9 4
40IMX7-03-8
48IMS7-03-9 4
70IMX7-03-8
110IMX7-03-8
Z, G
Z, G
Z, G
Z, G
Z, G
Z, G
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
16.8 – 753
36 – 75
40 – 121
60 – 150
80
81
81
82
80
80
20IMX7-05-8
24IMS7-05-9
40IMX7-05-8
48IMS7-05-9
70IMX7-05-8
110IMX7-05-8
Z, G
Z, G
Z, G
Z, G
Z, G
Z, G
12
12
0.6
0.6
-
-
7.2
7.2
14 – 36
36 – 75
84
84
24IMS7-12-9C 4
48IMS7-12-9C 4
Z, G
Z, G
15
15
0.48
0.48
-
-
7.2
7.2
14 – 36
36 – 75
84
84
24IMS7-15-9C 4
48IMS7-15-9C 4
Z, G
Z, G
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
16.8 – 75 3
36 – 75
40 – 121
36 – 75
82
83
83
83
82
82
20IMX7-05-05-8
24IMS7-05-05-9
40IMX7-05-05-8
48IMS7-05-05-9
70IMX7-05-05-8
110IMX7-05-05-8
Z, G
Z, G
Z, G
Z, G
Z, G
Z, G
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
7.2
7.2
7.2
7.2
7.2
8.4 – 36
14 – 36
16.8 – 753
36 – 75
40 – 121
60 – 150
84
84
84
84
83
84
20IMX7-12-12-8
24IMS7-12-12-9
40IMX7-12-12-8
48IMS7-12-12-9
70IMX7-12-12-8
110IMX7-12-12-8
Z, G
Z, G
Z, G
Z, G
Z, G
Z, G
15
15
15
15
15
15
0.2
0.24
0.24
0.24
0.24
0.24
15
15
15
15
15
15
0.2
0.24
0.24
0.24
0.24
0.24
6
7.2
7.2
7.2
7.2
7.2
8.4 – 36
14 – 36
16.8 – 753
36 – 75
40 – 121
60 – 150
84
84
84
84
83
84
20IMX7-15-15-8
24IMS7-15-15-9
40IMX7-15-15-8
48IMS7-15-15-9
70IMX7-15-15-8
110IMX7-15-15-8
Z, G
Z, G
Z, G
Z, G
Z, G
Z, G
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
16.8 – 753
36 – 75
40 – 121
60 – 150
84
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
Z, G
Z, G
Z, G
Z, G
Z, G
Z, G
Flexible load distribution on double outputs possible.
If only one output voltage is required, 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.
Not for new designs
BCD20007-G Rev AD, 4-Nov-09
Page 2 of 15
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IMX7/IMS7 DC-DC 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:
Open frame .................................................. Z
RoHS compliant for all six substances ......... G
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.
Obsolete options:
Surface mount version ............................... M
C-pinout ...................................................... C
Functional Description
03042a
Vi+ 1
The IMX7/IMS7 Series DC-DC converters are feedbackcontrolled flyback converters using current mode PWM (Pulse
Width Modulation).
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
Vo nom, using either an external resistor or an external voltage
source.
Trim (R) 4
Vi+ 1
11 Vo+
PWM
i
3
10
Vo–
2 × 2200 pF
1500 V
12
Vi– 2
13 R
n.c. 4
14 n.c.
Fig. 1
Block diagram for single-output models with standard pinout.
BCD20007-G Rev AD, 4-Nov-09
10 Vo1–
PWM
i 3
13 Vo2+
Vi – 2
12 Vo2–
For double-output models, the output voltage is sensed by a
separate transformer winding close to the secondary and fed
03025
11 Vo1+
2 × 2200 pF
14 n.c.
Fig. 2
Block diagram for dual-output models with standard pinout.
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.
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).
The inhibit input i allows remote control of the outputs; pin i
must be connected to Vi– to activate the converter.
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IMX7/IMS7 DC-DC 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
Characteristics
Vi
Input voltage range 1
Vi nom
Nominal input voltage
Conditions
min
TC min – TC max
I o = 0 – Io nom
8.4
Vi sur
Repetitive surge voltage
abs. max input (3 s)
Converter 2
start-up time
Worst case condition at
Vi min and full load
t rise
Rise time
inh. release
2
Vi nom
Io nom
2.4
0.25 0.5
0.1
0.1
0.1
0.1
150
15
30
8
4.7
15
8
0.5
+0.8
–10
15
8
0.2
+0.8
–10
Vi max 2.4
Vi max
or open
or open
2.4
–0.5
–0.5
– 0.5
1
1
1
1
I inr p
Inrush peak current
Vi = Vi nom 4
fs
Switching frequency
Vi min – Vi max, Io = 0 – Io nom
I i rr
Reflected ripple current
Io = 0 – Io nom
EN
3
μF
V
mA
3
3
3
3.8
3.7
4.2
5.6
A
approx. 400
approx. 400
approx. 400
approx. 300
kHz
10
mApp
50
55022 3
mA
Vi max 2.4
Vi max
or open
or open
–0.5
Vi min – Vi max
15
+0.8
converter operating
Input current when the
converter is inhibited
ms
0.2
+0.8 –10
converter inhibited
I i inh
6
0.25 0.5
5
converter inhibited
5
0.25 0.5
12
–10
s
100
0.5
5
converter operating
V
110
12
(for surge calculation)
4
70
150
50 5
5
Inhibit voltage
3
40
typ max Unit
121 60
12
Input capacitance
2
typ max min
40
5
Vinh
1
75
12
Ci
Input RFI level conducted
typ max min
16.8 6
110IMX7
resistive load
Io = 0, Vi min – Vi max
Vi RFI
70IMX7
capacitive load
No load input current
Inhibit current
36
0.25
Ii o
Iinh
max min
20
t start up
switch on
typ
40IMX7
B
30
B
20
B
B
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.
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.
Vo
Vo nom
trise
tstart up
04008a
t
Fig. 3
Converter start-up and rise time
BCD20007-G Rev AD, 4-Nov-09
Page 4 of 15
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IMX7/IMS7 DC-DC Series Data Sheet
7-Watt DC-DC Converters
®
Table 2b: Input data of IMS7; general conditions as in table 2a
Input
24IMS7
Characteristics
Conditions
Vi
Input voltage range 1
Vi nom
Nominal input voltage
TC min – TC max
I o = 0 – Io nom
Vi sur
Repetitive surge voltage
abs. max input (3 s)
t start up
Converter 2
Worst case condition at
Vi min and full load
start-up time
t rise
switch on
inh. release
Rise time 2
Vi nom
Io nom
min
0.25
converter operating
–10
converter inhibited
2.4
6
0.8
12
–10
Vi max
2.4
+0.8
–0.5
–0.5
1
1
Inrush peak current
Vi = Vi nom 4
fs
Switching frequency
Vi min – Vi max, Io = 0 – Io nom
I i rr
Reflected ripple current
Io = 0 – Io nom
EN
mA
V
Vi max
converter operating
I inr p
s
μF
0.5
+0.8
converter inhibited
Vi min – Vi max
4
24
or open
Input current when the
converter is inhibited
0.5
ms
or open
I i inh
V
0.1
5
(for surge calculation)
3
0.25
12
Inhibit voltage
2
0.5
5
Input capacitance
Unit
75
100
12
12
max
48
resistive load
Vinh
1
typ
capacitive load
Ci
Input RFI level conducted
36
0.1
Io = 0, Vi min – Vi max
Vi RFI
min
36
50
No load input current
Inhibit current
max
24
Ii o
Iinh
typ
14
48IMS7
3
mA
3
4.0
3.9
A
approx. 330
approx. 330
kHz
40
55022 3
B
30
mApp
B
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
BCD20007-G Rev AD, 4-Nov-09
Page 5 of 15
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IMX7/IMS7 DC-DC Series Data Sheet
7-Watt DC-DC Converters
®
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.
In order to protect the converters, transient suppressors are
fitted to the input; see table below:
Table 3: Built-in transient voltage suppressor
Model
Breakdown
Voltage
VBR nom
20IMX7 1
Peak Power
at 1 ms
PP
Peak Pulse
Current
I PP
overvoltage lockout at approx. 38 V
24IMS7 2
53 V
600 W
7.7 A
40IMX7 2
100 V
1500 W
11 A
48IMS7 2
100 V
600 W
4.1 A
70IMX7 2
144 V
600 W
2.9 A
110IMX7 2
167 V
600 W
2.5 A
1
2
Note: Suppressor diode D is only necessary for 20IMX7 models.
To withstand 150 V transients according to 19 Pfl 1, applicable for
40 IMX7 models, the same external circuitry with similar
components as for IEC/EN 61000-4-5, level 2 compliance can be
used.
Input Fuse and Reverse Polarity Protection
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:
–
–
–
–
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
110IMX7 a fast 0.63 A (F.63A) fuse.
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.
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
4
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
To achieve IEC/EN 61000-4-5, level 2 compliance, an
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.
04030a
3
1
0
0
20
40
60
80 µs
Fig. 5
Typical inrush current at Vi nom , Po nom measured according to
ETS 300132-2 (40IMX7).
07064
Vi+
L
C
+
i
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
Model
L
C
D
20IMX7
330 μH, 1 A, 0.115 Ω
68 μF, 63 V
1.5KE39A
24IMS7
330 μH, 0.6 A, 0.42 Ω
68 μF, 63 V
n.a.
40IMX7
330 μ H, 0.6 A, 0.42 Ω
68 μF, 100 V
n.a.
48IMS7
330 μ H, 0.6 A, 0.42 Ω
68 μF, 100 V
n.a.
70IMX7
1000 μ H, 0.6 A, 0.42 Ω
68 μF, 100 V
n.a.
110IMX7
330 μH, 0.2 A
200 μF, 200 V
n.a.
BCD20007-G Rev AD, 4-Nov-09
Page 6 of 15
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IMX7/IMS7 DC-DC 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
Characteristics
Conditions
min
Vo
Output voltage setting
Vi nom
3.28
5.1 V
typ
max
min
3.32
5.07
12 V
typ
min
typ
5.13 11.82
1.2
max
min typ
12.18 14.78
Unit
V
Io nom
Output current (nom.)
Vi min – Vi max
Current limit 2
Vi nom
3.0
2.4
1.2
1.1
ΔVo
Line and load regulation
Vi min – Vi max
Io = (0.05 – 1) Io nom
±1
±1
±1
±1
%
vo
Output voltage noise
Vi min – Vi max
Io = I o nom
70
70
120
150
mV pp
5
6
110IMX7
0.6
max
15.22
Io L
other models
1.5
max
15 V
20
40
20
40
25
40
50
40
50
n.a.
0.48
50
A
30
60
n.a.
Vo clp
Output overvoltage limit 7
Co ext
Admissible capacitive load
Vo d
Dynamic Voltage deviat.
load
Recovery time
regulation
Vi nom
Io nom ↔ 1/2 Io nom
±250
±250
±330
±330
mV
1
1
1
1
ms
Temperature coefficient
ΔVo /ΔTC (TC min to TC max)
Vi min – Vi max
Io = (0.05 – 1) Io nom
±0.02
±0.02
±0.02
±0.02
%/K
td
αVo
Minimum load 1%
115
130
115
130
2500
115
130
2000
115
300
130
%
200
μF
Table 5b: Output data for double-output models
Output
Vo nom
Characteristics
Vo1
Vo2
Output voltage
setting
Vo1
Vo2
Io nom
Io L
ΔVo1
Current
limit 2 3
4.96
4.95
5.04 11.90
5.05 11.88
12.10 14.88
12.12 14.85
IMS7 Vi nom
I o1 = I o2 = 0.5 I o nom
4.92
4.92
5.08 11.82
5.08 11.82
12.18 14.78
12.18 14.78
Line regulation
Output voltage noise
4
Vo clp
Output overvoltage limit 7
Co ext
Admissible capacitive load 3
Vo d
Dynamic Voltage deviat.
load
Recovery time
regulation
1
2
3
4
5
6
7
min
typ
2 ×15 V
IMX7 Vi nom
I o1 = I o2 = 0.5 I o nom
max min
typ
2 × 24 V
max min
typ
max
Unit
15.12 23.81
15.15 23.75
24.19
24.25
V
15.22 23.64
15.22 23.64
24.36
24.36
2 × 0.6
2 × 0.25
2 × 0.2
2 × 0.13
2 × 0.7
2 × 0.3
2 × 0.24
2 × 0.15
20IMX7 Vi nom
Load regulation
αVo
typ max
A
2.4
1.0
0.95
0.5
2.8
1.2
1.1
0.6
Vi min – Vi max, I o nom
±1
±1
±1
±1
Vi nom , (0.1 – 1) Io nom
±3
±3
±3
±3
80
120
150
240
other models
vo1, 2
2 × 12 V
min
Output current
20IMX7 Vi min – Vi max
(nom.)1
other models
ΔVo l
td
2×5V
Conditions
Vi min – Vi ma
I o = I o nom
5
6
Minimum load 1%
20
115
40
130
25
115
2000
Vi nom
Io nom ↔ 1/2 Io nom
Temperature coefficient
Vi min – Vi max
ΔVo /ΔTC (TC min to TC max)Io = (0.05 – 1) Io nom
50
130
30
115
60
130
300
50
115
200
%
mVpp
100
130
%
100
μF
±150
±330
±350
±600
mV
1
1
1
1
ms
±0.02
±0.02
±0.02
±0.02
%/K
Each output is capable of delivering full output power Po nom according to table Model Selection.
The current limit is primary side controlled.
Measured with both outputs connected in parallel.
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.
BCD20007-G Rev AD, 4-Nov-09
Page 7 of 15
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IMX7/IMS7 DC-DC Series Data Sheet
7-Watt DC-DC Converters
®
Thermal Considerations
Output Overvoltage Protection
If the converter, mounted on a PCB, is located in free, quasistationary 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.
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.
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.
Po /Po max
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.
Both outputs of double-output models can be connected in
parallel without any precautions. Several converters (singleor 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.
JM017
Vo [V]
1.0
05087a
5.5
0.8
0.5 m/s = 100 LFM
5.0
natural cooling
4.5
0.6
0.4
4.0
0.2
0
20
40
60
80
100
°C
TA
Fig. 6
3.5
3.0
0
Maximum allowed output power versus ambient temperature
0.4
0.8
1.2
1.6
Io [A]
Short-Circuit Behavior
Fig. 8a
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 versus Io (typ.) of single-output models with Vo = 5.1 V
Vo [V]
05086a
13
12
Vo [%]
100
overload short-circuit condition
11
switch-off
10
70
05041b
9
8
7
0
Fig. 7
Overload switch-off (hiccup mode).
BCD20007-G Rev AD, 4-Nov-09
t
0
0.2
0.4
0.6
0.8
Io total [A]
0.3 s
Fig. 8b
Vo versus Io (typ.) of double-output models (2 ×12 V) with both
outputs in parallel
Page 8 of 15
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IMX7/IMS7 DC-DC Series Data Sheet
7-Watt DC-DC Converters
®
η [%]
Typical Performance Curves
05052a
90
Vo1 [V]
70
13
12.5
Vi nom
Vi max
Vi min
80
05088a
13.5
Io2 = 0.03 A
60
50
12
Io2 = 0.3 A
40
11.5
25
50
Po
100 % Po nom
75
11
0.05
0.15
0.10
0.20
0.25
0.3
Io1 [A]
Fig. 9
Fig. 11
Cross load regulation (typ.) of double-output models (2 ×12
V). The cross-load effect is negligible.
Efficiency versus input voltage and load.
Typical values (40IMX7-12-12-8).
Vo1 , Vo2 [V]
05059a
12.8
12.4
Vo2
Vo1
12
11.6
11.2
0
30
60
90
150
120
Io1
[%]
Io1 nom
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.
should be connected to Vi– to enable the output (active low
logic, fail safe).
Auxiliary Functions
Inhibit Function
Converter operating:
–10 V to 0.8 V
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
Converter inhibited
or inhibit pin i left open:
2.4 V to Vi max
(20/40IMX7,
24/48IMS7)
2.4 V to 75 V
(70/110IMX7)
06070
Adjustable Output Voltage
Vi+
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 Vi min (see Electrical Input Data) increases
proportionally to Vo /Vo nom.
i
Vi –
Fig. 12
If the inhibit is not used, the inhibit pin should be connected
to Vi–
BCD20007-G Rev AD, 4-Nov-09
Page 9 of 15
www.power-one.com
IMX7/IMS7 DC-DC Series Data Sheet
7-Watt DC-DC Converters
®
Single-output models with R-input:
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.
Adjustment of the output voltage is possible in the range of
100 to 105% of Vo nom using an external resistor, or in the range
of 75 to 105% of Vo nom using an external voltage source.
06089a
06131
Vo+
Vi+
Rext1
Vo1+
Trim
Vo1–
+
R
Vext
Rext2
Vi–
Vi+
–
Rext
Vi–
Control
circuit
Vref 2.5 V
Vo2+
Vo2–
Vo–
Fig. 13
Fig. 15
Output voltage control with external resistor
Output voltage adjust for double-output models
a) Adjustment by means of an external resistor:
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 nom (85 to 100% for 3.3 V outputs):
Vo
Rext1 ≈ 4 kΩ • –––––––––
Vo nom – Vo
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
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.
Caution: Connection of Rext to Vi+ may damage the converter.
or: Rext2 between the R pin and Vo+ to achieve an output
voltage range of approximately Vo = 100 to 105 % of Vo nom:
(Vo – 2.5 V)
Rext2 ≈ 4 kΩ • ––––––––––––––––––
2.5 V • (Vo/Vo nom – 1)
Table 6: Rext for Vo > Vo nom
approximate values (Vi nom, Io1 = Io2 = 0.5 Io1/2 nom)
b) Adjustment by means of an external voltage Vext between
Vo– and R pin.
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
Vext ≈ ––––––––
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).
06029b
Vi+
Vo+
Vref = 2.5 V
Rext 2
4 kΩ
R
Control
logic
Vi–
+
Vext
Rext1
Vo-
Ω]
Rext [ kΩ
105 to 108 (107 typically)
105
104
103
102
101
100
0
1.5
5.6
12
27
68
∞
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.
Note: Applying a control voltage greater than 20 V will set the
converter into a hiccup mode.
-
Table 7: Vext for Vo = 75 to 105% Vo nom;
typical values (Vi nom, Io1 = Io2 = 0.5 Io1/2 nom)
Fig. 14
Output voltage adjust for single-output models
Double-output models with Trim input:
The Trim input (pin 4) of double-output models is referenced
to the primary side. The figure below shows the circuitry.
BCD20007-G Rev AD, 4-Nov-09
Vo [% Vo nom ]
Page 10 of 15
Vo [% Vo nom]
Vext [V]
≥105
102
95
85
75
0
1.6
4.5
9
13
www.power-one.com
IMX7/IMS7 DC-DC Series Data Sheet
7-Watt DC-DC Converters
®
Electromagnetic Compatibility (EMC)
A suppressor diode together with an input filter form an
effective protection against high input transient voltages, which
typically occur in many installations, but especially in batterydriven mobile applications.
Electromagnetic Immunity
Table 8: Immunity type tests
Phenomenon
Standard
Class
level
Coupling
mode 1
Value
applied
Waveform
Source
imped.
Test
procedure
In
oper.
Perform.2
Electrostatic
discharge
to case 5
IEC/EN
61000-4-2
2
contact discharge
4000 Vp
1/50 ns
330 Ω
yes
B
3
air discharge
8000 Vp
10 positive and
10 negative
discharges
Electromagnetic
field
IEC/EN
36
23
antenna
10 V/m
3 V/m 3
AM 80%
1 kHz
n.a.
80 – 1000 MHz
yes
A
ENV 50204
3
23
antenna
10 V/m
3 V/m 3
PM, 50% duty
cycle, 200 Hz
repetition frequ.
n.a.
900 MHz
yes
A
Electrical fast
transients/burst
IEC/EN
61000-4-4
4
33
direct +i/–i
50 Ω
60 s positive,
60 s negative
transients per
coupling mode
yes
B
Surges
IEC/EN
61000-4-5
34
23 4
+i/–i
2000 Vp
1000 Vp 3
1.2/50 μs
2Ω
5 pos. and 5 neg.
surges
yes
B
RF conducted
immunity
IEC/EN
61000-4-6
3
23
+i/–i
10 VAC
3 VAC
AM modul. 80%
1 kHz
50 Ω
0.15 to 80 MHz
150 Ω
yes
A
1
2
3
4
5
6
4000 Vp bursts of 5/50 ns
2000 Vp 3 5 kHz repet. rate,
transients with
15 ms burst
duration, and
300 ms period
i = input, o = output
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
PMM 8000 PLUS
Name: 20_7_15
dbμV
Date: 5.9.07
Time: 08:18
20IMX7-15-15-8
Peak
60
80
40
20
20
0.2
0.5
1
2
5
10
20 MHz
EN 55022 A
60
40
0
Time: 08:00
Peak
0
0.2
0.5
1
2
5
10
40IMX7D24-con-p
EN 55022 A
20IMX7D15-con-p
80
Date: 5.9.07
40IMX7-24-24-8
PMM 8000 PLUS
Name: 40_7_24
dbμV
20 MHz
Fig. 16a
Fig. 16b
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)
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)
BCD20007-G Rev AD, 4-Nov-09
Page 11 of 15
www.power-one.com
IMX7/IMS7 DC-DC Series Data Sheet
7-Watt DC-DC Converters
®
PMM 8000 PLUS
Name: 110_7_05
dbμV
Date: 5.9.07
110IMX7-05-8
Time: 08:00
Peak
EN 55022 A
60
40
20
20
0.2
0.5
1
2
5
10
EN 55022 A
60
40
0
Time: 09:10
Peak
80
110IMX7-05-con-p
80
Date: 5.9.07
48IMS7-15-15-8
PMM 8000 PLUS
Name: 48_7_15
dbμV
0
20 MHz
0.2
0.5
1
2
5
10
20 MHz
Fig. 16c
Fig. 17
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
Cab
Damp heat
steady state
IEC/EN 60068-2-78
MIL-STD-810D section 507.2
Temperature:
Relative humidity:
Duration:
40 ±2 °C
93 +2/-3 %
56 days
Converter
not
operating
Status
Ea
Shock
(half-sinusoidal)
IEC/EN 60068-2-27 1
MIL-STD-810D section 516.3
Acceleration amplitude:
Bump duration:
Number of bumps:
100 gn = 981 m/s2
6 ms
18 (3 each direction)
Converter
operating
Eb
Bump
(half-sinusoidal)
IEC/EN 60068-2-29
MIL-STD-810D section 516.3
Acceleration amplitude:
Bump duration:
Number of bumps:
40 gn = 392 m/s2
6 ms
6000 (1000 each direction)
Converter
operating
Fc
Vibration
(sinusoidal)
IEC/EN 60068-2-6
Acceleration amplitude:
Converter
operating
Frequency (1 Oct/min):
Test duration:
0.35 mm (10 to 60 Hz)
5 gn = 49 m/s2 (60 to 2000 Hz)
10 to 2000 Hz
7.5 h (2.5 h each axis)
Fh
Vibration,
broad-band
random
(digital control)
IEC/EN 60068-2-64
Acceleration spectral density:
Frequency band:
Acceleration magnitude:
Test duration:
0.05 gn2/Hz
10 to 500 Hz
4.9 gn rms
3 h (1 h each axis)
Converter
operating
Kb
Salt mist, cyclic
(sodium chloride
NaCl solution)
IEC/EN 60068-2-52
Concentration:
Duration:
Storage:
Storage duration:
Number of cycles:
5% (30 °C)
2 h per cycle
40 °C, 93% rel. humidity
22 h per cycle
3
Converter
not
operating
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
Characteristics
Conditions
min
max
min
max
Unit
TA
Ambient temperature
Operational 1
–40
71
–40
85
°C
TC
Case temperature
–40
95
–40
105
TS
Storage temperature
–55
100
–55
105
1
Non operational
See Thermal Considerations
BCD20007-G Rev AD, 4-Nov-09
Page 12 of 15
www.power-one.com
IMX7/IMS7 DC-DC Series Data Sheet
7-Watt DC-DC Converters
®
Failure Rates
Table 11: MTBF and device hours
Model
Standard
Ground benign
Ground fixed
Ground mobile
TC = 40 °C
TC = 40 °C
TC = 70 °C
TC = 50 °C
634 000
321 000
188 000
271 000
24IMS7-05-9
MIL-HDBK-217F
40IMX7-12-12-8
MIL-HDBK-217F
851 000
395 000
253 000
342 000
Bellcore
3 019 000
1 510 000
809 000
409 000
Bellcore
3 320 000
1 660 000
871 000
447 000
3.81(0.15")
3 × 5.08 (0.2")
Dimensions in mm.
Weight: 1 s
1.2
1.5
2.0
0.1
kVAC
Equivalent DC volt.
1.5
2.0
2.5
0.15
kVDC
Coupling
capacitance
1.2
1.2
1.2
-
nF
>100
>100
>100
-
MΩ
Insulation resist.
at 500 VDC
• Pollution degree 2 environment
• Connecting the input to a secondary circuit, which is
subject to a maximum transient rating of
- 1500 V for 20IMX7, 24IMS7, 40IMX7, 48IMS7
- 2000 V for 70IMX7
- 2500 V for 110IMX7.
The converters are subject to manufacturing surveillance in
accordance with the above mentioned standards.
Railway Applications
To comply with railway standards, all components are coated
with a protective lacquer (except option Z).
1
Between the outputs of double-output models
Description of Options
Option Z: Open Frame
For applications, where the protection by a housing is not
necessary or in the case that the motherboard should be
lacquered after fitting the converter.
Note: The converters shall not be exposed to cleaning
processes, as this will damage the glue of the ferrite cores.
Option G: RoHS-6
Protection Degree
The protection degree of the converters is IP 30, except openframe models (option Z).
Converters with a type designation ending by G are RoHScompliant for all six substances.
NUCLEAR AND MEDICAL APPLICATIONS - Power-One products are not designed, intended for use in, or authorized for use as critical components
in life support systems, equipment used in hazardous environments, or nuclear control systems without the express written consent of the
respective divisional president of Power-One, Inc.
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.
BCD20007-G Rev AD, 4-Nov-09
Page 14 of 15
www.power-one.com
IMX7/IMS7 DC-DC Series Data Sheet
7-Watt DC-DC Converters
®
EC Declaration of Conformity
We
Power-One AG
Ackerstrasse 56, CH-8610 Uster
declare under our sole responsibility that IMS/IMX7 Series DC-DC converters carrying the
CE-mark are in conformity with the provisions of the Low Voltage Directive (LVD) 73/23/EEC
of the European Communities.
Conformity with the directives is presumed by conformity with the following harmonised
standards:
• EN 61204:1995 (= IEC 61204:1993, modified)
Low-voltage power supply devices, DC output - Performance characteristics
and safety requirements
• EN 60950:2000 (= IEC 60950:2000)
Safety of information technology equipment.
The installation instructions given in the corresponding data sheet describe correct installation
leading to the presumption of conformity of the end product with the LVD. All IMS/IMX7 DCDC converters are components, intended exclusively for inclusion within other equipment by
an industrial assembly operation or by professional installers. They must not be operated as
standalone products.
Hence conformity with the Electromagnetic Compatibility Directive 89/336/EEC (EMC Directive)
needs not to be declared. Nevertheless, guidance is provided in the data sheets on how
conformity of the end product with EMC standards under the responsibility of the installer can
be achieved, from which conformity with the EMC Directive can be presumed.
Uster, 10 June 2006
Power-One AG
Rolf Baldauf
Vice President Engineering
BCD20007-G Rev AD, 4-Nov-09
Page 15 of 15
Johann Milavec
Director Projects and IP
www.power-one.com
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