®
BCD20007 Rev AA Page 1 of 14 www.power-one.com
IMX7 DC-DC Series Data Sheet
7-Watt DC-DC Converters
Input voltage ranges up to 150 VDC
1 or 2 outputs up to 48 VDC
1500 to 2500 VDC I/O electric strength test
RoHS lead-free solder and lead-solder-exempted products
are available
Extremely wide input voltage ranges
Electrical isolation, single and dual outputs
Immunity to IEC/EN 61000-4-2, -3, -4, -5, -6
High efficiency (typ. 84%)
Flex power: flexible load distribution on outputs
Outputs no-load and short-circuit proof
High reliability and no derating
Operating ambient temperature –40 to +85 °C
2” × 1” case with 10.5 mm profile
Description
The IMX7 Series of board-mountable 7 Watt DC-DC converters
has been designed according to the latest industry require-
ments 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.
Covering a total input voltage range from 8.4 VDC up to
150 VDC with four different types, the converters are available
with single and electrically isolated double outputs from 3.3 up
to 48 VDC with flexible load distribution on double outputs.
Features include efficient input and output filtering with
unsurpassed 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 inst ances required in battery-supported systems,
where the bus voltage may exceed the SELV limit of 60 V. They
are designed and built according to the international safety
standards IEC/EN 60950 and approved by TÜV, UL, and cUL.
In addition, 70IMX7 and 110IMX7 models are CE-marked.
The circuit is comprised of integral planar magnetics, and all
components are automatically assembled and solidly 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 con-
siderations 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.
Features
Table of Contents Page Page
50.8
2.0"
25.4
1.0"
10.5
0.42"
Description .............................................................................1
Model Selection .....................................................................2
Functional Description ...........................................................3
Electrical Input Data...............................................................4
Electrical Output Data ............................................................6
Auxiliary Functions.................................................................8
Electromagnetic Compatibility (EMC) ..................................10
Immunity to Environmental Conditions ................................ 11
Safety and Installation Instructions ......................................12
Mechanical Data ..................................................................12
Description of Options .........................................................13
EC Declaration of Conformity ..............................................14
1
1 70/110IMX7 models
®
BCD20007 Rev AA Page 2 of 14 www.power-one.com
IMX7 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
[VDC] [A] 1 [VDC] [A] 1 [W] [VDC] [%]
3.3 1.5 - - 5 8.4 – 36 79 20IMX7-03-8 Z, G
3.3 1.5 - - 5 16.8 – 75381 40IMX7-03-8 Z, 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 16.8 – 75381 40IMX7-05-8 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
5 0.6 5 0.6 6 8.4 – 36 82 20IMX7-05-05-8 Z, G
5 0.6 5 0.6 7 16.8 – 75383 40IMX7-05-05-8 Z, G
5 0.6 5 0.6 7 40 – 121 82 70IMX7-05-05-8 Z, G
5 0.6 5 0.6 7 60 – 150 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 0.25 12 0.25 7.2 16.8 – 75384 40IMX7-12-12-8 Z, G
12 0.25 12 0.25 7.2 40 – 121 83 70IMX7-12-12-8 Z, G
12 0.25 12 0.25 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 0.2 15 0.2 7.2 16.8 – 75384 40IMX7-15-15-8 Z, G
15 0.2 15 0.2 7.2 40 – 121 83 70IMX7-15-15-8 Z, G
15 0.2 15 0.2 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 0.13 24 0.13 7.2 16.8 – 75384 40IMX7-24-24-8 Z, G
24 0.13 24 0.13 7.2 40 – 121 83 70IMX7-24-24-8 Z, G
24 0.13 24 0.13 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.
Part Number Description
Input voltage range Vi
8.4 – 36 VDC ......................................... 20
16.8 – 75 VDC ....................................... 40
40 – 121 VDC ........................................ 70
60 – 150 VDC ...................................... 11 0
Series.........................................................................IMX7
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
Options: Open frame.................................................. Z
RoHS compliant for all six substances......... G
Example: 20IMX7-05-05-8ZG: DC-DC converter, input voltage range 8.4 – 36 V, 2 outputs providing each 5 V, 600 mA,
temperature range 40 to 85 °C, open frame, RoHS compliant for all six substances.
Obsolete options (NFND: not for new designs; contact Power-One for availability):
TA = –25 to 71 °C .......................................-9
Surface mount version ............................... M
C-pinout ...................................................... C
20 IMX7 - 05 - 05 -8 Z G
®
BCD20007 Rev AA Page 3 of 14 www.power-one.com
IMX7 DC-DC Series Data Sheet
7-Watt DC-DC Converters
Functional Description
The IMX7 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%
Vo nom, using either an external resistor or an external voltage
source.
Fig. 2
Block diagram for dual-output models with standard pinout.
Fig. 1
Block diagram for single-output models with standard pinout.
PWM
2 × 2200 pF
13
1
2
3
4
11
10
12
Vi+
i
Vi
n.c.
Vo+
Vo
R
03041a
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
For double-output models, the output voltage is sensed by a
separate transformer winding close to the secondary and fed
back to the primary control circuit. The close magnetic coupling
provided by the planar construction ensures very good
regulation and allows for flexible load distribution. The Trim
input (R) is referenced to the primary side of double-output
models, and allows for programming the output voltages in the
range 100 to 105% Vo nom by means of an external resistor, or
within 75 to 100% 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 of
Io1 nom and Io2 nom for the double-output models).
The inhibit input i allows remote control of the outputs; pin i
must be connected to Vi– to activate the converter.
®
BCD20007 Rev AA Page 4 of 14 www.power-one.com
IMX7 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 2: Input Data
Input 20IMX7 40IMX7 70IMX7 110IMX7
Characteristics Conditions min typ max min typ max min typ max min typ max Unit
ViInput voltage range1TC min TC max 8.4 36 16.8 6 75 40 121 60 150 VDC
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 m A
converter inhibited 1 1 1 1
Ii inh Input current when the Vi min Vi max 3.0 3.0 3.0 3.0
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 EN 55022 3 BBBB
conducted and radiated
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 lenght of 0.1 m, leads twisted. Double output units with both outputs in parallel. 70/110 IMX7 types need an external
capacitor at the input. (e.g. 1 µF film or ceramic)
4Source impedance according to prETS 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
®
BCD20007 Rev AA Page 5 of 14 www.power-one.com
IMX7 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 are always possible caused, for example 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
Voltage at 1 ms Current
VBR nom PPIPP
20IMX7 1 overvoltage lockout at approx. 38 V
40IMX7 2 100 V 1500 W 11 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.
Table 4: Components for external circuitry to comply with IEC/EN 61000-4-5
Circuit Ref. 20IMX7 40IMX7 70IMX7 110IMX7
L 330 µH, 0.115 330 µH, 0.42 1000 µH, 2.9 330 µH
1 A 600 mA 290 mA 200 mA
C 68 µF, 63 V 68 µF, 100 V 47 µF, 150 V 200 µF, 200 V
D 1.5KE39A n.a. n.a. n.a.
Fig. 4
Example for external circuitry to comply with IEC/EN
61000-4-5, level 2 (transzorb D only for 20IMX7).
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.
Note: The 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.
Vi+
Vi–
07064
C
LD
+i
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 a fast 2 A (F2A) fuse
For 40IMX7 a fast 1 A (F1A) fuse
For 70IMX7 a fast 0.63 A (F.63A) fuse
For 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
®
BCD20007 Rev AA Page 6 of 14 www.power-one.com
IMX7 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
Characteristics Conditions min typ max min typ max Unit
VoOutput voltage setting Vi nom 3.28 3.32 5.07 5.13 V
Io nom Output current (nom.) Vi minVi max 1.5 1.2 A
Io L Current limit2Vi nom 3.0 2.4
VoLine and load regulation Vi minVi max ±1 ±1 %
Io = (0.05 – 1) Io nom
voOutput voltage noise Vi minVi max 570 70 mVpp
20/40/70IMX7 Io = Io nom 620 40 20 40
110IMX7 40 50 40 50
Vo clp Output overvoltage limit 7 Minimum load 1 % 115 130 115 130 %
Co ext Admissible capacitive load 2500 2000 mF
Vo d Dynamic Voltage deviat. Vi nom ±250 ±250 mV
tdload Recovery time Io nom 1/2 Io nom 11ms
regulation
αVo Temperature coefficient Vi minVi 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
Characteristics Conditions min typ max min typ max min typ max min typ max Unit
Vo1 Output voltage setting Vi nom 4.96 5.04 11.90 12.10 14.88 15.12 23.81 24.19 VDC
Vo2 Io1 = Io2 = 0.5 Io nom 4.95 5.05 11.88 12.12 14.85 15.15 23.75 24.25
Io nom Output 20IMX7 Vi minVi max 2 × 0.6 2 × 0.25 2 × 0.2 2 × 0.13 A
current140/70/110IMX7 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 40/70/110IMX7 2.8 1.2 1.1 0.6
Vo1 Line regulation Vi minVi max, Io nom ±1 ±1 ±1 ±1 %
Vo 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 111 1ms
regulation
αVo Temperature coefficient Vi minVi max ±0.02 ±0.02 ±0.02 ±0.02 %/K
Vo/TC (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.
®
BCD20007 Rev AA Page 7 of 14 www.power-one.com
IMX7 DC-DC Series Data Sheet
7-Watt DC-DC Converters
Thermal Considerations
If a 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 TC (see Mechanical Data) will approach the
indicated value 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. The
thermal conditions depend on 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, the ambient temperature TA may be
higher or lower.
Caution: The case temperature TC measured at the measuring
point of case temperature TC (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.
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.
Fig. 7
Vo versus Io (typ.) of single-output models with Vo = 5.1 V
Fig. 8
Vo versus Io (typ.) of double-output models (2 ×12 V) with both
outputs in parallel
Fig. 9
Cross load regulation (typ.) of double-output models (2 ×12
V). The cross-load effect is negligible.
Output Overvoltage Protection
The outputs are protected against overvoltages 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 overvoltages, 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.
Typical Performance Curves
Fig. 6
Overload switch-off (hiccup mode).
70
100
V
o
[%]
t
05041a
0.3 s
overload short-circuit condition
switch-off
0
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 Io [A]
Vo [V]
05087a
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
®
BCD20007 Rev AA Page 8 of 14 www.power-one.com
IMX7 DC-DC Series Data Sheet
7-Watt DC-DC Converters
Fig. 11
Efficiency versus input voltage and load.
Typical values (40IMX7-12-12-8).
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
40
50
60
70
80
90 05052a
25 50 75 100 % Po
Po nom
Vi nom
Vi max
Vi min
η [%]
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 unit 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).
Converter operating: –10 V to 0.8 V
Converter inhibited
or inhibit pin i left open: 2.4 V to Vi max (20/40IMX7)
2.4 V to 75 V (70/110IMX7)
Adjustable Output Voltage
As a standard feature, all IMX7 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 75 to 105% 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.
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.
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:
Fig. 12
If the inhibit is not used, the inhibit pin should be
connected to Vi–
Vi+
Vi
i
06070
R
Vo+
Vo–
Vi+
Vi– Rext2
Rext1
06131a
Fig. 13
Output voltage control with external resistor
®
BCD20007 Rev AA Page 9 of 14 www.power-one.com
IMX7 DC-DC Series Data Sheet
7-Watt DC-DC Converters
Fig. 14
Output voltage adjust for single-output models
Either: Rext1 between the R pin and Vo– to achieve an
output voltage adjustment range of Vo = 75 to 100% Vo nom
(85 to 100% for 3.3 V outputs):
Vo
Rext1 4 k–––––––––
Vo nomVo
or: Rext2 between the R pin and Vo+ to achieve an output
voltage range of approximately Vo = 100 to 105% Vo nom:
(Vo – 2.5 V)
Rext2 4 k––––––––––––––––––
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% 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).
R
Vo+
Vo–
+
V
ext
4 k
V
ref
= 2.5 V
control
circuit
Vi+
Vi– R
ext1
R
ext2
06029a
+
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 circuit topology.
Adjustment of the output voltage is possible in the range of 100
to 105% Vo nom using an external resistor , or in the range of 75 to
105% Vo nom using an external voltage source.
Trim
Vo1+
Vo2–
+
V
ext
Vi+
Vi–
R
ext
Vo1–
Vo2+
06089a
Control
circuit
V
ref
=2.5 V
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.
b) Adjustment by means of an external voltage source Vext.
For external output voltages in the range of 75 to 105%
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.
Fig. 15
Output voltage adjust for double-output models
Table 6: Rext for Vo > Vo nom
approximate values (Vi nom, Io1, 2 = 0.5 Io1/2 nom)
Vo [% Vo nom]Rext [kW]
105 to 108 (107 typically) 0
105 1.5
104 5.6
103 12
102 27
101 68
100
Table 7: Vext for Vo = 75 to 105% Vo nom;
typical values (Vi nom, Io1, 2 = 0.5 Io1/2 nom)
Vo [% Vo nom]Vext [V]
105 0
102 1.6
95 4.5
85 9
75 13
®
BCD20007 Rev AA Page 10 of 14 www.power-one.com
IMX7 DC-DC Series Data Sheet
7-Watt DC-DC Converters
Electromagnetic Emissions
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 typically
Fig. 16
Typical conducted emissions (quasi-peak) at the input at
Vi nom and Io nom according to EN 55011/22. Output leads 0.1
m, twisted. (40IMX7-15-15). External capacitor (1 µF ceramic
or film) required at the input for 70IMX7, 110IMX7 models.
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 10 positive and yes B
discharge 61000-4-2 3 air discharge 8000 Vp10 negative
to case 5discharges
Electromagnetic IEC/EN 3 3 antenna 10 V/m AM 80 % n.a. 80 1000 MHz yes A
field 61000-4-3 1 kHz
3 antenna 10 V/m PM, 50% duty n.a. 900 MHz yes A
cycle, 200 Hz
repetition frequ.
Electrical fast IEC/EN 4 direct +i/–i 4000 Vpbursts of 5/50 ns 50 60 s positive, yes B
transients/burst 61000-4-4 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 µs 2 5 pos. and 5 neg. yes B
61000-4-5 surges
RF conducted IEC/EN 3 +i /–i 3 VAC AM modul. 80% 50 0.15 to 80 MHz yes A
immunity 61000-4-6 (140 dBµV) 1 kHz 150
1i = input, o = output
2Performance criterion: A = normal operation, no deviation from specifications, B = temporary deviation from specs possible.
3Corresponds to the railway standard EN 50121-3-2:2000, table 9.1
4External components required.
5R or Trim pin open, i pin connected with Vi–.
07023a
EN 55022 A
EN 55022 B
80
70
60
50
40
30
20
10
0
0.01
0.05
0.1
0.5
1
2
5
10
20
30
[dBµV]
MH
z
0.02
Fig. 17
Typical radiated emissions at Vi nom, Io nom, measured
according to EN 55011/22 with an antenna (distance 10 m).
Output leads 0.1 m, twisted (70IMX-7-15-15).
35
30
25
20
15
10
0
30
40
50
100
200
300
60
80
[MHz]
[dBµV/m]
400
500
600
800
07024a
EN 55022 B
®
BCD20007 Rev AA Page 11 of 14 www.power-one.com
IMX7 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, 93% 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 (Standard)
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
1 See Thermal Considerations
Table 11: MTBF and device hours
MTBF Ground benign Ground fixed Ground mobile
TC = 40 °C TC = 40 °C TC = 70 °C TC = 50 °C
40IMX7-05-8 (MIL-HDBK-217F) 1 672 000 h 248 000 h 83 800 h 84 800 h
40IMX7-15-15-8 (MIL-HDBK-217F) 1 640 000 h 214 000 h 83 000 h 77 000 h
Temperatures
1Covers also EN50155/ EN61373 category 1, class B, body mounted (= chassis of coach)
Failure Rates
®
BCD20007 Rev AA Page 12 of 14 www.power-one.com
IMX7 DC-DC Series Data Sheet
7-Watt DC-DC Converters
Mechanical Data
Dimensions in mm.
Weight: <20 g
Fig. 18
Case IMX7 with standard
pinout
Fig. 19
Open frame (option Z)
Safety and Inst allation Instructions
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
condition.
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.
European
Projection
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 (0.13")
45.7 (1.8")
25.4 (1")
4.6 (0.18")
S09030a
Measuring point
of case temperature T
C
Pin Allocation
Fig. 20
Footprint
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.
Bottom view
1
410
14
10011
2
311
12
13
43.2 (1.7")
S90002a
48 (1.9")
5 x 3.81
(0.15")
1.27 (0.05")
23 (0.9")
8.25
(0.32")
3 x 5.08
(0.2")
1
410
14
3.5 (0.14")
1.2 (0.5")
®
BCD20007 Rev AA Page 13 of 14 www.power-one.com
IMX7 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 60950-1:2000.
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 20IMX4
and 40IMX7, 2000 V for 70IMX7, and 2500 for 110IMX7
models.
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).
Cleaning Agents
In order to avoid possible damage, any penetration of cleaning
fluids should be prevented, since the power supplies are not
hermetical sealed.
However, the open-frame models (option Z) leave the factory
unlacquered and may be cleaned and lacquered by the
customer, for instance together with the mother board. Consult
Power-One for suitable cleaning agents.
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.
Description of Options
Option Z: Open Frame
For applications, where the protection of the case is not
necessary or in the case that the motherboard should be
cleaned and lacquered with the converter fitted.
Table 12: Electric strength test voltages
Characteristic Input to output
20/40IMX 70IMX 110IMX o/o1Unit
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 - M
at 500 VDC
1Between outputs of double-output models
Isolation
The electric strength test is performed in the factory as 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.
®
BCD20007 Rev AA Page 14 of 14 www.power-one.com
IMX7 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 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 60950-1:2000 (= IEC 60950-1:2000)
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 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