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BCD20007-G Rev AD, 4-Nov-09 Page 1 of 15 www.power-one.com
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
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 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
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.
Table of Contents Page Page
50.8
2.0"
25.4
1.0"
10.5
0.42"
Safety according to IEC/EN 60950 and UL 60950
1 70/1 10IMX7 models
1
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 ......................................1 3
Description of Options .........................................................14
EC Declaration of Conformity ..............................................15
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BCD20007-G Rev AD, 4-Nov-09 Page 2 of 15 www.power-one.com
IMX7/IMS7 DC-DC Series Data Sheet
7-Watt DC-DC Converters
Model Selection
Table 1: Model Selection
Output 1 Output 2 Output power Input voltage Efficiency Model Options2
Vo1 nom Io1 nom Vo2 nom Io2 nom Po nom range ηη
ηη
ηtyp
[V] [A] 1 [V] [A] 1 [W] [V] [%]
3.3 1.5 - - 5 8.4 – 36 79 20IMX7-03-8 Z, G
3.3 1.5 - - 5 14 – 36 79 24IMS7-03-9 4Z, G
3.3 1.5 - - 5 16.8 – 75381 40IMX7-03-8 Z, G
3.3 1.5 - - 5 36 – 75 79 48IMS7-03-9 4Z, G
3.3 1.5 - - 5 40 – 121 79 70IMX7-03-8 Z, G
3.3 1.5 - - 5 60 – 150 79 110IMX7-03-8 Z, G
5.1 1.2 - - 6.1 8.4 – 36 80 20IMX7-05-8 Z, G
5.1 1.2 - - 6.1 14 – 36 81 24IMS7-05-9 Z, G
5.1 1.2 - - 6.1 16.8 – 75381 40IMX7-05-8 Z, G
5.1 1.2 - - 6.1 36 – 75 82 48IMS7-05-9 Z, G
5.1 1.2 - - 6.1 40 – 121 80 70IMX7-05-8 Z, G
5.1 1.2 - - 6.1 60 – 150 80 110IMX7-05-8 Z, G
12 0.6 - - 7.2 14 – 36 84 24IMS7-12-9C 4Z, G
12 0.6 - - 7.2 36 – 75 84 48IMS7-12-9C 4Z, G
15 0.48 - - 7.2 14 – 36 84 24IMS7-15-9C 4Z, G
15 0.48 - - 7.2 36 – 75 84 48IMS7-15-9C 4Z, G
5 0.6 5 0.6 6 8.4 – 36 82 20IMX7-05-05-8 Z, G
5 0.7 5 0.7 7 14 – 36 83 24IMS7-05-05-9 Z, G
5 0.7 5 0.7 7 16.8 – 75383 40IMX7-05-05-8 Z, G
5 0.7 5 0.7 7 36 – 75 83 48IMS7-05-05-9 Z, G
5 0.7 5 0.7 7 40 – 121 82 70IMX7-05-05-8 Z, G
5 0.7 5 0.7 7 36 – 75 82 110IMX7-05-05-8 Z, G
12 0.25 12 0.25 6 8.4 – 36 84 20IMX7-12-12-8 Z, G
12 0.3 12 0.3 7.2 14 – 36 84 24IMS7-12-12-9 Z, G
12 0.3 12 0.3 7.2 16.8 – 75384 40IMX7-12-12-8 Z, G
12 0.3 12 0.3 7.2 36 – 75 84 48IMS7-12-12-9 Z, G
12 0.3 12 0.3 7.2 40 – 121 83 70IMX7-12-12-8 Z, G
12 0.3 12 0.3 7.2 60 – 150 84 110IMX7-12-12-8 Z, G
15 0.2 15 0.2 6 8.4 – 36 84 20IMX7-15-15-8 Z, G
15 0.24 15 0.24 7.2 14 – 36 84 24IMS7-15-15-9 Z, G
15 0.24 15 0.24 7.2 16.8 – 75 384 40IMX7-15-15-8 Z, G
15 0.24 15 0.24 7.2 36 – 75 84 48IMS7-15-15-9 Z, G
15 0.24 15 0.24 7.2 40 – 121 83 70IMX7-15-15-8 Z, G
15 0.24 15 0.24 7.2 60 – 150 84 110IMX7-15-15-8 Z, G
24 0.13 24 0.13 6.2 8.4 – 36 84 20IMX7-24-24-8 Z, G
24 0.15 24 0.15 7.2 14 – 36 84 24IMS7-24-24-9 Z, G
24 0.15 24 0.15 7.2 16.8 – 75 384 40IMX7-24-24-8 Z, G
24 0.15 24 0.15 7.2 36 – 75 84 48IMS7-24-24-9 Z, G
24 0.15 24 0.15 7.2 40 – 121 83 70IMX7-24-24-8 Z, G
24 0.15 24 0.15 7.2 60 – 150 84 110IMX7-24-24-8 Z, G
1Flexible load distribution on double outputs possible.
2If only one output voltage is required, connect both outputs of double-output models in parallel.
3Operation at low input voltage possible, if Po is reduced to approx. 80% of Po nom at Vi min = 14.1 V.
4Not for new designs
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BCD20007-G Rev AD, 4-Nov-09 Page 3 of 15 www.power-one.com
IMX7/IMS7 DC-DC Series Data Sheet
7-Watt DC-DC Converters
Functional Description
The IMX7/IMS7 Series DC-DC converters are feedback-
controlled 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.
For double-output models, the output voltage is sensed by a
separate transformer winding close to the secondary and fed
Fig. 2
Block diagram for dual-output models with standard pinout.
Fig. 1
Block diagram for single-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.
Part Number Description
Input voltage range Vi
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
40 IMX7 - 05 - 05 -8 Z G
PWM
2 × 2200 pF
1500 V
13
1
2
3
4
11
10
12
14
Vi+
i
Vi
n.c.
Vo+
Vo
R
n.c.
03025
PWM
2 × 2200 pF 14
1
2
3
4
11
10
12
13
Vi+
Trim (R)
i
Vi
Vo1+
Vo1
Vo2+
Vo2
n.c.
03042a
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BCD20007-G Rev AD, 4-Nov-09 Page 4 of 15 www.power-one.com
IMX7/IMS7 DC-DC Series Data Sheet
7-Watt DC-DC Converters
Electrical Input Data
General conditions:
–T
A = 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
Characteristics Conditions min typ max min typ max min typ max min typ max Unit
ViInput voltage range1TC min T C max 8.4 36 16.8 6 75 40 121 60 150 V
Vi nom Nominal input voltage Io = 0 Io nom 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 inh. release Vi min and full load 0.1 0.1 0.1 0.1
trise Rise time 2 Vi nom resistive load 5 5 5 5 m s
Io nom capacitive load 12 12 12 12
Ii o No load input current Io = 0, Vi min Vi max 15 30 8 15 8 15 8 15 mA
CiInput capacitance (for surge calculation) 4.7 0.5 0.2 0.2 μF
Vinh Inhibit voltage converter operating –10 +0.8 –10 +0.8 –10 +0.8 –10 +0.8 V
converter inhibited 2.4 Vi max 2.4 Vi max 2.4 Vi max 2.4 Vi max
or open or open or open or open
Iinh Inhibit current converter operating 0.5 0.5 0.5 0.5 mA
converter inhibited 1 1 1 1
Ii inh Input current when the Vi min Vi max 3333
converter is inhibited
Iinr p Inrush peak current Vi = Vi nom 4 3.8 3.7 4.2 5.6 A
fsSwitching frequency Vi min Vi max, Io = 0 Io nom approx. 400 approx. 400 approx. 400 approx. 300 kHz
Ii rr Reflected ripple current Io = 0 Io nom 50 30 20 10 mApp
Vi RFI Input RFI level conducted EN 55022 3 BBBB
1Vi 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.
2Measured with a resistive and the max. admissible capacitive load.
3Measured 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.
4Source impedance according to ETS 300132-2, version 4.3, at Vi nom.
5The DC-DC converter shuts down automatically at approx. 38 V.
6Operation at lower input voltage possible: Po approx. 80% of Po nom at Vi min = 14.4 V.
Fig. 3
Converter start-up and rise time
V
o nom
V
o
t
start up
t
rise
t
04008a
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BCD20007-G Rev AD, 4-Nov-09 Page 5 of 15 www.power-one.com
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 48IMS7
Characteristics Conditions min typ max min typ max Unit
ViInput voltage range1TC min TC max 14 36 36 75 V
Vi nom Nominal input voltage Io = 0 Io nom 24 48
Vi sur Repetitive surge voltage abs. max input (3 s) 50 100
tstart up Converter 2 switch on Worst case condition at 0.25 0.5 0.25 0.5 s
start-up time inh. release Vi min and full load 0.1 0.1
trise Rise time 2 Vi nom resistive load 5 5 ms
Io nom capacitive load 12 12
Ii o No load input current Io = 0, Vi min Vi max 12 24 6 12 mA
CiInput capacitance (for surge calculation) 0.8 0.5 μF
Vinh Inhibit voltage converter operating –10 +0.8 –10 +0.8 V
converter inhibited 2.4 Vi max 2.4 Vi max
or open or open
Iinh Inhibit current converter operating 0.5 0.5 m A
converter inhibited 1 1
Ii inh Input current when the Vi min Vi max 33
converter is inhibited
Iinr p Inrush peak current Vi = Vi nom 4 4.0 3.9 A
fsSwitching frequency Vi min Vi max, Io = 0 Io nom approx. 330 approx. 330 kHz
Ii rr Reflected ripple current Io = 0 Io nom 40 30 mApp
Vi RFI Input RFI level conducted EN 55022 3 BB
1Vi 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.
2Measured with a resistive and the max. admissible capacitive load.
3Measured 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.
4Source impedance according to ETS 300132-2, version 4.3, at Vi nom
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BCD20007-G Rev AD, 4-Nov-09 Page 6 of 15 www.power-one.com
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 Peak Power Peak Pulse
Vol tage at 1 ms Current
VBR nom PPIPP
20IMX7 1 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
1The 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.
2If 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.
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.
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.
Fig. 5
Typical inrush current at Vi nom, Po nom measured according to
ETS 300132-2 (40IMX7).
0
1
2
3
A
0 20 40 60 80 µs
04030a
4
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 Ω68 μF, 63 V 1.5KE39A
24IMS7 330 μH, 0.6 A, 0.42 Ω68 μF, 63 V n.a.
40IMX7 330 μH, 0.6 A, 0.42 Ω68 μF, 100 V n.a.
48IMS7 330 μH, 0.6 A, 0.42 Ω68 μF, 100 V n.a.
70IMX7 1000 μH, 0.6 A, 0.42 Ω68 μF, 100 V n.a.
110IMX7 330 μH, 0.2 A 200 μF, 200 V n.a.
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.
Fig. 4
Example for external circuitry to comply with IEC/EN
61000-4-5, level 2 (transzorb D only for 20IMX7).
Vi+
Vi–
07064
C
LD
+i
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BCD20007-G Rev AD, 4-Nov-09 Page 7 of 15 www.power-one.com
IMX7/IMS7 DC-DC Series Data Sheet
7-Watt DC-DC Converters
Electrical Output Data
General conditions:
–T
A = 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 12 V 15 V
Characteristics Conditions min typ max min typ max min typ max min typ max Unit
VoOutput voltage setting Vi nom 3.28 3.32 5.07 5.13 11.82 12.18 14.78 15.22 V
Io nom Output current (nom.) Vi minVi max 1.5 1.2 0.6 0.48 A
Io L Current limit2Vi nom 3.0 2.4 1.2 1.1
ΔVoLine and load regulation Vi minVi max ±1 ±1 ±1 ±1 %
Io = (0.05 1) Io nom
voOutput voltage noise Vi minVi max 570 70 120 150 mVpp
other models Io = Io nom 620 40 20 40 25 50 30 60
110IMX7 40 50 40 50 n.a. n.a.
Vo clp Output overvoltage limit 7 Minimum load 1% 115 130 115 130 115 130 115 130 %
Co ext Admissible capacitive load 2500 2000 300 200 μF
Vo d Dynamic Voltage deviat. Vi nom ±250 ±250 ±330 ±330 mV
tdload Recovery time Io nom 1/2 Io nom 1111ms
regulation
αVo Temperature coefficient Vi minVi max ±0.02 ±0.02 ±0.02 ±0.02 %/K
ΔVo/ΔTC (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
Characteristics Conditions min typ max min typ max min typ max min typ max Unit
Vo1 Output voltage IMX7 Vi nom 4.96 5.04 11.90 12.10 14.88 15.12 23.81 24.19 V
Vo2 setting Io1 = Io2 = 0.5 Io nom 4.95 5.05 11.88 12.12 14.85 15.15 23.75 24.25
Vo1 IMS7 Vi nom 4.92 5.08 11.82 12.18 14.78 15.22 23.64 24.36
Vo2 Io1 = Io2 = 0.5 Io nom 4.92 5.08 11.82 12.18 14.78 15.22 23.64 24.36
Io nom Output current 20IMX7 Vi minVi max 2 × 0.6 2 × 0.25 2 × 0.2 2 × 0.13 A
(nom.)1other models 2 × 0.7 2 × 0.3 2 × 0.24 2 × 0.15
Io L Current 20IMX7 Vi nom 2.4 1.0 0.95 0.5
limit 2 3 other models 2.8 1.2 1.1 0.6
ΔVo1 Line regulation Vi minVi max, Io nom ±1 ±1 ±1 ±1 %
ΔVo l Load regulation 4Vi nom, (0.11) Io nom ±3 ±3 ±3 ±3
vo1, 2 Output voltage noise Vi minVi ma 580 120 150 240 mVpp
Io = Io nom 620 40 25 50 30 60 50 100
Vo clp Output overvoltage limit 7 Minimum load 1% 115 130 115 130 115 130 115 130 %
Co ext Admissible capacitive load32000 300 200 100 μF
Vo d Dynamic Voltage deviat. Vi nom ±150 ±330 ±350 ±600 mV
tdload Recovery time Io nom 1/2 Io nom 11 1 1ms
regulation
αVo Temperature coefficient Vi minVi max ±0.02 ±0.02 ±0.02 ±0.02 %/K
ΔVo/ΔTC (TC min to TC max)Io = (0.05 – 1) Io nom
1Each output is capable of delivering full output power Po nom according to table Model Selection.
2The current limit is primary side controlled.
3Measured with both outputs connected in parallel.
4Conditions for specified output. Other output loaded with constant current Io = 0.5 Io nom.
5BW = 20 MHz
6Measured with a probe according to EN 61204.
7The overvoltage protection is not tracking with the R control.
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BCD20007-G Rev AD, 4-Nov-09 Page 8 of 15 www.power-one.com
IMX7/IMS7 DC-DC Series Data Sheet
7-Watt DC-DC Converters
Thermal Considerations
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.
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.
Fig. 8a
Vo versus Io (typ.) of single-output models with Vo = 5.1 V
Fig. 8b
Vo versus Io (typ.) of double-output models (2 ×12 V) with both
outputs in parallel
Short-Circuit Behavior
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.
Output Overvoltage Protection
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.
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 (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.
Fig. 7
Overload switch-off (hiccup mode).
7
8
9
10
11
12
13
V
o
[V]
0.2 0.4 0.6 0.8 I
o total
[A]
0
05086a
5.5
5.0
4.5
4.0
3.5
3.0 00.4 0.8 1.2 1.6 I
o
[A]
V
o
[V]
05087a
1.0
0.8
0.6
0.4
0
0.2
20
40 60 80
100 °C
P
o
/P
o max
JM017
T
A
0.5 m/s
=
100 LFM
natural cooling
70
100
V
o
[%]
t
05041b
0.3 s
overload short-circuit condition
switch-off
0
Fig. 6
Maximum allowed output power versus ambient temperature
®
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
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 .
Vo1, Vo2 [V]
Io1
Io1 nom
05059a
12.8
12.4
12
11.6
11.2 030
60 90 120 150 [%]
Vo2
Vo1
Typical Performance Curves
Fig. 9
Cross load regulation (typ.) of double-output models (2 ×12
V). The cross-load effect is negligible.
11
11.5
12
12.5
13
13.5
V
o1
[V]
0.10 0.15 0.20 0.25 0.3 I
o1
[A]
0.05
05088a
I
o2
= 0.3 A
I
o2
= 0.03 A
Auxiliary Functions
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
Vi+
Vi
i
06070
Fig. 11
Efficiency versus input voltage and load.
Typical values (40IMX7-12-12-8).
40
50
60
70
80
90 05052a
25 50 75 100 % Po
Po nom
Vi nom
Vi max
Vi min
η [%]
Fig. 12
If the inhibit is not used, the inhibit pin should be connected
to Vi–
should be connected to Vi– to enable the output (active low
logic, fail safe).
Converter operating: –10 V to 0.8 V
Converter inhibited
or inhibit pin i left open: 2.4 V to Vi max (20/40IMX7,
24/48IMS7)
2.4 V to 75 V (70/1 10IMX7)
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 Vi min (see Electrical Input Data) increases
proportionally to Vo/Vo nom.
®
BCD20007-G Rev AD, 4-Nov-09 Page 10 of 15 www.power-one.com
IMX7/IMS7 DC-DC Series Data Sheet
7-Watt DC-DC Converters
Table 7: Vext for Vo = 75 to 105% Vo nom;
typical values (Vi nom, Io1 = Io2 = 0.5 Io1/2 nom)
Vo [% Vo nom]Vext [V]
105 0
102 1.6
95 4.5
85 9
75 13
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.
Fig. 13
Output voltage control with external resistor
R
Vo+
Vo–
Vi+
Vi– Rext2
Rext1
06131
Fig. 14
Output voltage adjust for single-output models
R
Vo+
Vo-
+
V
ex
t
-
4 kΩ
V
ref
= 2.5 V
Control
logic R
ext1
R
ext2
06029b
Vi–
Vi+
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 nomVo
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)
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).
Trim
Vo1+
Vo2–
+
Vext
Vi+
Vi–
Rext
Vo1–
Vo2+
06089a
Control
circuit
V
ref
2.5 V
Fig. 15
Output voltage adjust for double-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.
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.
Table 6: Rext for Vo > Vo nom
approximate values (Vi nom, Io1 = Io2 = 0.5 Io1/2 nom)
Vo [% Vo nom]Rext [kΩΩ
ΩΩ
Ω]
105 to 108 (107 typically) 0
105 1.5
104 5.6
103 12
102 27
101 68
100
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.
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.
®
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
Electromagnetic Emissions
typically occur in many installations, but especially in battery-
driven mobile applications.
Electromagnetic Comp atibility (EMC)
A suppressor diode together with an input filter form an
effective protection against high input transient volt ages, which
Fig. 16a
20IMX7-15-15-8: Typical conducted emissions (peak) at the
input at Vi nom and I o nom according to EN 55011/22. Output
leads 0.1 m, twisted. External input capacitor (1 μF ceramic +
100 μF electrolytic cap)
Electromagnetic Immunity
Table 8: Immunity type tests
Phenomenon Standard Class Coupling Value Waveform Source Test In Per-
level mode1applied imped. procedure oper. form. 2
Electrostatic IEC/EN 2 contact discharge 4000 Vp1/50 ns 330 Ω10 positive and yes B
discharge 61000-4-2 3 air discharge 8000 Vp10 negative
to case 5discharges
Electromagnetic IEC/EN 3 6 antenna 10 V/m AM 80 % n.a. 80 1000 MHz yes A
field 2 3 3 V/m 3 1 kHz
ENV 50204 3 antenna 10 V/m PM, 50% duty n.a. 900 MHz yes A
2 3 3 V/m 3 cycle, 200 Hz
repetition frequ.
Electrical fast IEC/EN 4 direct +i/–i 4000 Vpbursts of 5/50 ns 50 Ω60 s positive, yes B
transients/burst 61000-4-4 3 3 2000 Vp 3 5 kHz repet. rate, 60 s negative
transients with transients per
15 ms burst coupling mode
duration, and
300 ms period
Surges IEC/EN 3 4 +i/–i 2000 Vp1.2/50 μs2 Ω5 pos. and 5 neg. yes B
61000-4-5 2 3 4 1000 Vp 3 surges
RF conducted IEC/EN 3 +i/–i 10 VAC AM modul. 80% 50 Ω0.15 to 80 MHz yes A
immunity 61000-4-6 2 3 3 VAC 1 kHz 150 Ω
1i = input, o = output
2Performance criterion: A = normal operation, no deviation from specifications, B = temporary deviation from specs possible
3Valid for 24I MS7 and 4 8IMS7
4External components required
5R or Trim pin open, i pin connected with Vi–
6Corresponds to the railway standard EN 50121-3-2:2000, table 9.1
PMM 8000 PLUS Date: 5.9.07 Time: 08:00
40IMX7D24-con-p
dbμV
80
60
20
40
0
0.2 0.5 1 2
5 10 20 MHz
EN 55022 A
40IMX7-24-24-8 Peak
Name: 40_7_24
20IMX7-15-15-8 Peak
PMM 8000 PLUS
Name: 20_7_15
Date: 5.9.07 Time: 08:18
20IMX7D15-con-p
dbμV
80
60
20
40
0
0.2 0.5 1 2
5 10 20 MHz
EN 55022 A
Fig. 16b
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 12 of 15 www.power-one.com
IMX7/IMS7 DC-DC Series Data Sheet
7-Watt DC-DC Converters
Immunity to Environment al Conditions
Table 9: Mechanical and climatic stress
Test Method Standard Test conditions Status
Cab Damp heat IEC/EN 60068-2-78 Temperature: 40 ±2 °C Converter
steady state MIL-STD-810D section 507.2 Relative humidity: 93 +2/-3 % not
Duration: 56 days operating
Ea Shock IEC/EN 60068-2-27 1 Acceleration amplitude: 100 gn = 981 m/s2Converter
(half-sinusoidal) MIL-STD-810D section 516.3 Bump duration: 6 ms operating
Number of bumps: 18 (3 each direction)
Eb Bump IEC/EN 60068-2-29 Acceleration amplitude: 40 gn = 392 m/s2Converter
(half-sinusoidal) MIL-STD-810D section 516.3 Bump duration: 6 ms operating
Number of bumps: 6000 (1000 each direction)
Fc Vibration IEC/EN 60068-2-6 Acceleration amplitude: 0.35 mm (10 to 60 Hz) Converter
(sinusoidal) 5 gn = 49 m/s2 (60 to 2000 Hz) operating
Frequency (1 Oct/min): 10 to 2000 Hz
Test duration: 7.5 h (2.5 h each axis)
Fh Vibration, IEC/EN 60068-2-64 Acceleration spectral density: 0.05 gn2/Hz Converter
broad-band Frequency band: 10 to 500 Hz operating
random Acceleration magnitude: 4.9 gn rms
(digital control) Test duration: 3 h (1 h each axis)
Kb Salt mist, cyclic IEC/EN 60068-2-52 Concentration: 5% (30 °C) Converter
(sodium chloride Duration: 2 h per cycle not
NaCl solution) Storage: 40 °C, 9 3% rel. humidity operating
Storage duration: 22 h per cycle
Number of cycles: 3
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
TAAmbient temperature Operational 1 –40 71 –40 85 °C
TCCase temperature –40 95 –40 105
TSStorage temperature Non operational –55 100 –55 105
1See Thermal Considerations
Temperatures
1Covers also EN 50155/EN 61373 category 1, class B, body mounted (= chassis of coach)
Fig. 17
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).
PMM 8000 PLUS Date: 5.9.07 Time: 08:00
110IMX7-05-con-p
dbμV
80
60
20
40
0
110IMX7-05-8 Peak
Name: 110_7_05
0.2 0.5 1 2
5 10 20 MHz
EN 55022 A
PMM 8000 PLUS Date: 5.9.07 Time: 09:10
dbμV
80
60
20
40
0
48IMS7-15-15-8 Peak
Name: 48_7_15
0.2 0.5 1 2
5 10 20 MHz
EN 55022 A
Fig. 16c
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).
®
BCD20007-G Rev AD, 4-Nov-09 Page 13 of 15 www.power-one.com
IMX7/IMS7 DC-DC Series Data Sheet
7-Watt DC-DC Converters
Mechanical Data
Dimensions in mm.
Weight: <20 g
Fig. 18
Case IMX7/IMS7 with
standard pinout
Fig. 19
Open-frame model (option Z)
European
Projection
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 634 00 0 321 000 188 000 271 000 h
40IMX7-12-12-8 MIL-HDBK-217F 851 00 0 395 000 253 000 342 000
Bellcore 3 019 000 1 510 000 809 000 409 000
40IMX7-05-05-8 Bellcore 3 320 000 1 660 000 871 000 447 000
Failure Rates
Safety and Installation Instructions
Pin Allocation
Fig. 20
Footprint
Bottom view
1
410
14
10011
2
311
12
13
Table 12: Pin allocation (standard pinout and option Z)
Pin Single output Double output
1Vi+ Vi+
2Vi Vi
3i i
4 n.c. Trim
10 Vo– Vo1–
11 Vo+ Vo1+
12 Vo– Vo2–
13 R Vo2+
14 n.c. n.c.
50.8 (2")
3.81(0.15")
3.81(0.15")
3.81(0.15")
5 × 3.81
(0.15")
20.3 (0.8")
3 × 5.08 (0.2")
PT 2.2
self tapping screws
1
410
14
0.8 × 1.2 (0.03 × 0.05") pins
1.6 (0.06) PCB holes
10.5
(0.41")
3.4 ±0.3(0.13")
45.7 (1.8")
25.4 (1")
4.6 (0.18")
S09030b
Measuring point
of case temperature T
C
43.2 (1.7")
S90002b
48 (1.9")
1.27 (0.05")
23 (0.9")
5 x 3.81
(0.15")
8.25
(0.32")
3 x 5.08
(0.2")
1
410
14
3.5 ±0.1 (0.14")
1.2 (0.5")
Bottom view
T
C Z
Core
®
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
Standards and Approvals
The converters are approved by UL and TÜV according to UL
60950, CAN/CSA C22.2 No. 950-95, and IEC/EN 60950:2000.
The converters have been evaluated for:
Building in
Supplementary 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
- 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).
Protection Degree
The protection degree of the converters is IP 30, except open-
frame models (option Z).
NUCLEAR AND MEDICAL APPLICA TIONS - 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 product s, including safety agency certifications pictured on labels, may change depending on the
date manufactured. Specifications are subject to change without notice.
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
Converters with a type designation ending by G are RoHS-
compliant for all six substances.
Table 12: Electric strength test voltages
Characteristic Input to output o/o1Unit
20/40IMX 70IMX 110IMX
24/48IMS
Factory test > 1 s 1.2 1.5 2.0 0.1 kVAC
Equivalent DC volt. 1.5 2.0 2.5 0.15 kVDC
Coupling 1.2 1.2 1.2 - nF
capacitance
Insulation resist. >100 >100 >100 - MΩ
at 500 VDC
1Between the outputs of double-output models
Cleaning Agents
In order to avoid possible damage, any penetration of
cleaning fluids should be prevented, since the converters are
not hermetically sealed.
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. If necessary, the mother board must be cleaned
before populating the open-frame converter.
Isolation
The electric strength test is performed in the factory as a
routine test in accordance with EN 50116 and IEC/EN 60950,
and should not be repeated in the field. Power-One will not
honor any warranty claims resulting from electric strength field
tests.
Installation Instruction
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.
Connection to the system shall be made via a printed circuit
board; see Mechanical Data.
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.
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
in the non-earthed input supply line.
®
BCD20007-G Rev AD, 4-Nov-09 Page 15 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 V oltage 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 DC-
DC 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 Johann Milavec
Vice President Engineering Director Projects and IP