®
IMX7 DC-DC Series Data Sheet
7-Watt DC-DC Converters
Features
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
1
25.4
1.0"
10.5
0.42"
50.8
2.0"
1
70/110IMX7
models
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 instances 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.
70IMX7 and 110IMX7 models are also 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.
Table of Contents
Page
Page
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
www.power-one.com
Description ............................................................................. 1
Model Selection ..................................................................... 2
Functional Description ........................................................... 3
Electrical Input Data ............................................................... 4
Electrical Output Data ............................................................ 6
Auxiliary Functions ................................................................. 8
REV. APR 10, 2007
Page 1 of 14
®
IMX7 DC-DC Series Data Sheet
7-Watt DC-DC Converters
Model Selection
Table 1: Model Selection
Output 1
V
o1 nom
I
o1 nom
[ VDC]
[A]
1
3.3
3.3
3.3
3.3
5.1
5.1
5.1
5.1
5
5
5
5
12
12
12
12
15
15
15
15
24
24
24
24
1
2
3
Output 2
V
o2 nom
I
o2 nom
[ VDC]
[A]
1
-
-
-
-
-
-
-
-
5
5
5
5
12
12
12
12
15
15
15
15
24
24
24
24
-
-
-
-
-
-
-
-
0.6
0.6
0.6
0.6
0.25
0.25
0.25
0.25
0.2
0.2
0.2
0.2
0.13
0.13
0.13
0.13
Output power
P
o nom
[W ]
5
5
5
5
6.1
6.1
6.1
6.1
6
7
7
7
6
7.2
7.2
7.2
6
7.2
7.2
7.2
6.2
7.2
7.2
7.2
Input voltage
range
[ VDC]
8.4 – 36
16.8 – 75
3
40 – 121
60 – 150
8.4 – 36
16.8 – 75
3
40 – 121
60 – 150
8.4 – 36
16.8 – 75
3
40 – 121
60 – 150
8.4 – 36
16.8 – 75
3
40 – 121
60 – 150
8.4 – 36
16.8 – 75
3
40 – 121
60 – 150
8.4 – 36
16.8 – 75
3
40 – 121
60 – 150
Efficiency
η
typ
[%]
79
81
79
79
80
81
80
80
82
83
82
82
84
84
83
84
84
84
83
84
84
84
83
84
Model
Options
2
1.5
1.5
1.5
1.5
1.2
1.2
1.2
1.2
0.6
0.6
0.6
0.6
0.25
0.25
0.25
0.25
0.2
0.2
0.2
0.2
0.13
0.13
0.13
0.13
20IMX7-03-8
40IMX7-03-8
70IMX7-03-8
110IMX7-03-8
20IMX7-05-8
40IMX7-05-8
70IMX7-05-8
110IMX7-05-8
20IMX7-05-05-8
40IMX7-05-05-8
70IMX7-05-05-8
110IMX7-05-05-8
20IMX7-12-12-8
40IMX7-12-12-8
70IMX7-12-12-8
110IMX7-12-12-8
20IMX7-15-15-8
40IMX7-15-15-8
70IMX7-15-15-8
110IMX7-15-15-8
20IMX7-24-24-8
40IMX7-24-24-8
70IMX7-24-24-8
110IMX7-24-24-8
Z, G
Z, G
Z, G
Z, G
Z, G
Z, G
Z, G
Z, G
Z, G
Z, G
Z, G
Z, G
Z, G
Z, G
Z, G
Z, G
Z, G
Z, G
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
P
o
is reduced to approx. 80% of
P
o
nom at
V
i min
= 14.1 V.
Part Number Description
Input voltage range
V
i
8.4 – 36 VDC ......................................... 20
16.8 – 75 VDC ....................................... 40
40 – 121 VDC ........................................ 70
60 – 150 VDC ...................................... 110
Series ......................................................................... IMX7
Output voltage of output 1 ...................... 03, 05, 12, 15, 24
Output voltage of output 2 ............................ 05, 12, 15, 24
Operating ambient temperature
T
A
–40 to 85 °C ............................................... -8
Options:
Example:
Open frame .................................................. Z
RoHS compliant .......................................... G
20 IMX7 - 05 - 05 -8 Z G
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.
Obsolete options (NFND: not for new designs; contact Power-One for availability):
T
A
= –25 to 71 °C ....................................... -9
Surface mount version ............................... M
C-pinout ...................................................... C
REV. APR 10, 2007
Page 2 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% of
V
o 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
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% of
V
o nom
by means of an external resistor, or
within 75 to 100% of
V
o nom
, using an external voltage source.
Current limitation is provided by the primary circuit, thus limiting
the total output current (I
o nom
for the single- and the sum of
I
o1 nom
and
I
o2 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.
03041a
Vi+
1
11
Vo+
PWM
i
3
10
Vo–
2
×
2200 pF
Vi–
2
12
n.c.
4
13
R
Fig. 1
Block diagram for single-output models with standard pinout.
03042a
Vi+
1
11
Vo1+
Trim (R)
4
PWM
i
3
10
Vo1–
13
Vo2+
Vi –
2
2
×
2200 pF
12
Vo2–
14
n.c.
Fig. 2
Block diagram for dual-output models with standard pinout.
REV. APR 10, 2007
Page 3 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
T
C
is specified.
– Connector pin i connected with Vi–.
– Trim or R input not connected.
Table 2: Input Data
Input
Characteristics
V
i
V
i nom
V
i sur
t
start up
Input voltage range
1
Nominal input voltage
Repetitive surge voltage
Converter
2
start-up time
Rise time
2
switch on
inh. release
Conditions
T
C min
–
T
C max
I
o
= 0 –
I
o nom
abs. max input (3 s)
Worst case condition at
V
i min
and full load
V
i nom
I
o nom
resistive load
capacitive load
0.25
min
8.4
20
50
5
0.5
0.1
5
12
15
4.7
–10
2.4
0.8
–10
30
5
12
8
0.5
0.8
–10
15
20IMX7
typ
max min
36
16.8
6
40
100
0.25 0.5
0.1
5
12
8
0.2
0.8 –10
15
40IMX7
typ max min
75
40
70
150
0.25 0.5
0.1
5
12
8
0.2
0.8
15
mA
µF
V
0.25 0.5
0.1
ms
s
70IMX7
110IMX7
typ max Unit
150 VDC
110
typ max min
121 60
t
rise
I
i o
C
i
V
inh
No load input current
Input capacitance
Inhibit voltage
I
o
= 0,
V
i min
–
V
i max
(for surge calculation)
converter operating
converter inhibited
V
i max
2.4
V
i max
2.4
V
i max
2.4
V
i max
or open
or open
or open
or open
–0.5
1
3.0
3.8
3.7
approx. 400
30
B
B
–0.5
1
3.0
4.2
approx. 400
20
B
–0.5
1
3.0
5.6
approx. 300
10
– 0.5
1
3.0
A
kHz
mA
pp
mA
I
inh
I
i inh
I
inr p
f
s
I
i rr
V
i RFI
1
Inhibit current
converter operating
converter inhibited
Input current when the
converter is inhibited
Inrush peak current
Switching frequency
Reflected ripple current
Input RFI level
conducted and radiated
V
i min
–
V
i max
V
i
=
V
i nom 4
V
i min
–
V
i max
,
I
o
= 0 –
I
o nom
I
o
= 0 –
I
o nom
EN 55022
3
B
approx. 400
50
2
3
4
5
6
V
i min
will not be as stated, if
V
o
is increased above
V
o nom
by use of the R or Trim input. If the output voltage is set to a higher value,
V
i min
will be proportionally increased.
Measured with a resistive and the max. admissible capacitive load.
Measured 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)
Source impedance according to prETS 300132-2, version 4.3, at
V
i nom
.
The DC-DC converter shuts down automatically at approx. 38 V.
Operation at lower input voltage possible:
P
o
approx. 80% of
P
o nom
at
V
i min
= 14.4 V.
V
o
V
o nom
t
rise
04008a
t
start up
t
Fig. 3
Converter start-up and rise time
REV. APR 10, 2007
Page 4 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
Voltage
V
BR nom
Peak Power
at 1 ms
P
P
Peak Pulse
Current
I
PP
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 IMX 7 models, the same external circuitry with
similar components as for IEC/EN 61000-4-5, level 2
compliance can be used.
07064
Vi+
L
C
+
D
i
Vi–
20IMX7
1
40IMX7
2
70IMX7
2
110IMX7
2
1
overvoltage lockout at approx. 38 V
100 V
144 V
167 V
1500 W
600 W
600 W
11 A
2.9 A
2.5 A
Fig. 4
Example for external circuitry to comply with IEC/EN
61000-4-5, level 2 (transzorb D only for 20IMX7).
2
The built-in overvoltage trigger shuts down the converter at
approx. 38 V protecting the input up to 50 V DC. 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.
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.
Table 4: Components for external circuitry to comply with IEC/EN 61000-4-5
Circuit Ref.
L
C
D
20IMX7
330 mH, 0.115
Ω
1A
68 µF, 63 V
1.5KE39A
40IMX7
330 mH, 0.42
Ω
600 mA
68 µF, 100 V
n.a.
70IMX7
1000 mH, 2.9
Ω
290 mA
47 µF, 150 V
n.a.
110IMX7
330 mH
200 mA
200 µF, 200 V
n.a.
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
A
4
3
2
1
0
0
20
40
60
80 µs
04030a
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 V
i nom
, P
o nom
measured according to
ETS 300132-2 (40IMX7).
REV. APR 10, 2007
Page 5 of 14
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