Rugged Environment
DC-DC Converters <40 Watt
IMX 35 Series
35 Watt DC-DC Converters
Input to output electric strength test up to 4 kV DC
Input voltage: 9...36, 18...75 V DC
2, 3 and 4 outputs
Configurable output voltages from 3.3 to 60 V DC
• Extremely wide input voltage ranges
• Electrical isolation, also between outputs
• Emissions below EN 55022, level B
• Immunity to IEC/EN 61000-4-2,-3,-4,-5 and -6
• Programmable input undervoltage lock-out
• Shut down input
• Output voltages adjustable with flexible load distribu-
tion
• Frequency synchronisation
• Outputs no-load, overload and short-circuit proof
• Operating ambient temperature up to –40...85
°
C
• Thermal protection
• 3"
×
2,5" case with 10.5 mm profile or 8.9 mm open
frame
• Supplementary insulation
IMX 35 Series
63.5
2.5"
10.5
0.41"
76.2
3"
47.8
1.88"
8.9
0.35"
72.8
2.87"
Safety according to IEC/EN 60950, UL 1950
LGA
Approvals pending
Summary
The IMX 35 series of board mountable 35 Watt DC-DC con-
verters has been designed according to the latest industry
requirements and standards. The converters are particu-
larly suitable for use in mobile or stationary applications in
transport, railways, industry, or telecommunication where
variable input voltages or high transient voltages are preva-
lent.
Covering a total input voltage range from 9 up to 75 V with
2 different types. The units are available with double, triple
and quadruple outputs, electrically isolated, from 3.3 V up
to 60 V externally adjustable and with flexible load distribu-
tion. A shut down input allows remote converter on-off. Fea-
tures include consistently high efficiency over the entire in-
put voltage range, high reliability and excellent dynamic re-
sponse to load and line changes.
The converters are designed and built according to the in-
ternational safety standards IEC/EN 60950, UL 1950, CAN/
CSA C22.2 No.950-95. LGA, UL and cUL approvals are in
progress. The IMX 35 types provide supplementary insula-
tion. Connected to a secondary circuit the 40 IMX 35 types
provide SELV outputs even if the voltage at the converter
input exceeds the SELV-limit of 60 V DC.
The circuit comprises of two planar magnetics devices and
all components are automatically assembled and solidly
soldered onto a single PCB without any wire connection.
Magnetic feedback ensures maximum reliability and
repeatability in the control loop over all operating condi-
tions. Careful considerations of possible thermal stresses
ensure the absence of hot spots providing long life in envi-
ronments where temperature cycles are a reality. The ther-
mal design without using any potting material allows opera-
tion at full load up to an ambient temperature of 71°C in free
air. For extremely high vibration environments the case has
holes for screw mounting. Various options as e.g. extended
temperature range –40...85°C or an alternative pinout pro-
vide a high level of application specific engineering and de-
sign-in flexibility.
Table of Contents
Page
Summary .......................................................................... 1
Type Survey and Key Data .............................................. 2
Type Key .......................................................................... 3
Functional Description ...................................................... 4
Electrical Input Data ......................................................... 6
Electrical Output Data ...................................................... 8
Page
Auxiliary Functions ......................................................... 11
Electromagnetic Compatibility (EMC) ............................ 13
Immunity to Environmental Conditions ........................... 14
Mechanical Data ............................................................ 15
Safety and Installation Instructions ................................ 16
Description of Option ...................................................... 18
Edition 1/10.99
1/18
IMX 35 Series
Type Survey and Key Data
Table 1: Type survey
Output 1
U
o nom
I
o nom
[V DC]
[A]
3.3
3.3
5.1
5.1
12
12
15
15
3.3
3.3
3.3
3.3
3.3
3.3
5.1
5.1
5.1
5.1
5.1
5.1
5
5
12
12
15
15
4.25
4.5
3.3
3.5
1.3
1.4
1.1
1.2
4.25
4.5
4.25
4.5
4.25
4.5
3.3
3.5
3.3
3.5
3.3
3.5
1.35
1.4
0.65
0.7
0.55
0.6
Output 2
U
o nom
I
o nom
[V DC]
[A]
5
5
5
5
12
12
15
15
5
5
12
12
15
15
5
5
12
12
15
15
5
5
12
12
15
15
2.7
2.8
2.7
2.8
1.3
1.4
1.1
1.2
1.35
1.4
0.65
0.7
0.55
0.6
1.35
1.4
0.65
0.7
0.55
0.6
1.35
1.4
0.65
0.7
0.55
0.6
DC-DC Converters <40 Watt
Rugged Environment
Output 3
U
o nom
I
o nom
[V DC]
[A]
-
-
-
-
-
-
-
-
5
5
12
12
15
15
5
5
12
12
15
15
5
5
12
12
15
15
-
-
-
-
-
-
-
-
1.35
1.4
0.65
0.7
0.55
0.6
1.35
1.4
0.65
0.7
0.55
0.6
1.35
1.4
0.65
0.7
0.55
0.6
Output 4
U
o nom
I
o nom
[V DC]
[A]
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
5
5
12
12
15
15
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
1.35
1.4
0.65
0.7
0.55
0.6
Input voltage
U
i min
...U
i max
[V DC]
9...36
18...75
9...36
18...75
9...36
18...75
9...36
18...75
9...36
18...75
9...36
18...75
9...36
18...75
9...36
18...75
9...36
18...75
9...36
18...75
9...35
18...75
9...35
18...75
9...35
18...75
Eff.
h
typ
[%]
83
84
87
87
Type
designation
20 IMX 35-03-05-9
40 IMX 35-03-05-9
20 IMX 35-05-05-9
40 IMX 35-05-05-9
20 IMX 35-1212-9
40 IMX 35-1212-9
20 IMX 35-1515-9
40 IMX 35-1515-9
Trim
Opt.
second.
second.
primary
primary
second.
-8
Z
i
83
86
20 IMX 35-03D05-9
40 IMX 35-03D05-9
20 IMX 35-03D12-9
40 IMX 35-03D12-9
20 IMX 35-03D15-9
40 IMX 35-03D15-9
20 IMX 35-05D05-9
40 IMX 35-05D05-9
20 IMX 35-05D12-9
40 IMX 35-05D12-9
20 IMX 35-05D15-9
40 IMX 35-05D15-9
20 IMX 35 D05D05-9
40 IMX 35 D05D05-9
20 IMX 35 D12D12-9
40 IMX 35 D12D12-9
20 IMX 35 D15D15-9
40 IMX 35 D15D15-9
83
86
second.
87
86
87
87
89
88
89
primary
primary
primary
Trim
The Trim input on the primary side influences all outputs, while Trim1 on the secondary side influences the first output (U
o1
)
only.
For the units IMX 35-12-12 and IMX 35-15-15 primary Trim (pin 5) is the Trim input influencing both outputs, while pin 18 is
not connected.
For the units IMX 35-03-05 and IMX 35-05-05, secondary Trim1 (pin 18) is the Trim1 input influencing only
U
o1
, while pin 5
is not connected.
Edition 1/10.99
2/18
Rugged Environment
Type Key
Dual output units
DC-DC Converters <40 Watt
IMX 35 Series
20 IMX 35 - 12 - 12 -9 i Z
Input voltage range
U
i
9...36 V DC ........................................... 20
18...75 V DC ........................................... 40
Series ...................................................................... IMX 35
Output 1 of double types .............................. 03, 05, 12, 15
Output 2 of double types .................................... 05, 12, 15
Operating ambient temperature range
T
A
–40...71°C (standard) ................................. -9
–40...85°C (option) ..................................... -8
Options:
Inhibit ............................................................ i
Open frame .................................................. Z
20 IMX 35 - 05 D05 -9 i Z
Triple output units
Input voltage range
U
i
9...36 V DC ........................................... 20
18...75 V DC ........................................... 40
Series ...................................................................... IMX 35
Output 1 of triple types ............................................. 03, 05
Output 2 and 3 of triple types ..................... D05, D12, D15
Operating ambient temperature range
T
A
–40...71°C (standard) ................................. -9
–40...85°C (option) ..................................... -8
Options:
Inhibit ............................................................ i
Open frame .................................................. Z
Quad output units
Input voltage range
U
i
9...36 V DC ........................................... 20
18...75 V DC ........................................... 40
Series ...................................................................... IMX 35
Output 1 and 4 of quad types ..................... D05, D12, D15
Output 2 and 3 of quad types ..................... D05, D12, D15
Operating ambient temperature range
T
A
–40...71°C (standard) ................................. -9
–40...85°C (option) ..................................... -8
Options:
Inhibit ............................................................ i
Open frame .................................................. Z
20 IMX 35 D05 D05 -9 i Z
Edition 1/10.99
3/18
IMX 35 Series
Functional Description
DC-DC Converters <40 Watt
Rugged Environment
The IMX 35 family of DC-DC converters consists of two
feedback controlled interleaved switching flyback power
trains using current mode PWM (pulse width modulation).
Functionally the converters are of three main types. The
dual output types consist of two electrically isolated outputs
Vo1, Vo2. Vo1 and Vo2 derives from two power trains and
are electrically isolated. Voltage regulation for each output
is achieved with passive transformer feedback from the
main transformer of each power train. Adjustment of the
outputs voltages in the range of 80...105% of
U
o nom
is pos-
sible via Trim input on the primary side (See:
Block dia-
gram, dual output types.)
The triple output types consist of
3 outputs Vo1, Vo2, Vo3 and two configurations. In the first
configuration Vo1 is a power train with a 5.1 V or 3.3 V out-
put and a synchronous rectifier, thus enabling high effi-
ciency. Also there is active magnetic feedback on this out-
put via a pulse transformer which results in very tight and
reliable regulation of the output voltage. The other two out-
puts Vo2 and Vo3 are electrically isolated double outputs.
Vo2, Vo3 are restricted to being of the same output voltage
(i.e. D05, D12, etc.). Voltage regulation is achieved with a
passive transformer feedback from the main transformer of
that power train.
Adjustment of the output voltages is provided for Vo1 via
the Trim1 pin referenced to the secondary side and allows
for programming of the voltage of output 1 in the range of
approx. 80...105% of
U
o nom
. (See:
Block diagram, triple
output types)
The quadruple output type consists of 4 outputs and two
power trains. Vo1, Vo4 derive from the first power train and
Vo2, Vo3 from the second one (thus each pair of outputs is
independent from the other one). Voltage regulation for
each pair of outputs is achieved with passive transformer
feedback from the main transformer of each power train.
Each pair of outputs are restricted to being of the same out-
put voltage type (i.e. D05, D12, etc.). If both power trains
have the same output voltage, all outputs may be adjusted
by means of the Trim input. (In case of different output volt-
ages, the Trim1 input influences only Vo1 and Vo4. See:
Block diagram, quadruple output types.)
Current limitation is provided by the primary circuit for each
power train and limits the possible output power for each
pair of outputs. In the case of an overload on either of the
power trains which causes the output voltage to fall less
than typically 60% of
U
o nom
, the entire converter will shut
down and automatically restart in short intervals.
Overtemperature protection is provided for each power
train which will shut down the converter in excessive over-
load conditions with automatic restart approximately in
short intervals.
03100
Vi+
4
PUL
1
Trim/n.c.
5
W
6
Ref
7
SD
8
Vi–
2
n.c.
3
PWM
17
Vo1+
15
Vo1–
18
Trim1/n.c.
13
Vo2+
11
Vo2–
19
n.c.
16
n.c.
Fig. 1
Block diagram 1, double output types
Edition 1/10.99
4/18
Rugged Environment
Vi+
4
PUL
1
n.c.
5
W
6
Ref
7
SD
1
Vi–
2
n.c.
3
DC-DC Converters <40 Watt
03097
IMX 35 Series
17
Vo1+
Control
PWM
15
Vo1–
18
Trim1
13
Vo2+
14
Vo2–
12
Vo3+
11
Vo3–
19
n.c.
Fig. 2
Block diagram 2, triple output types
03098
Vi+
4
PUL
1
Trim
5
W
6
Ref
7
SD
8
Vi–
2
n.c.
2
PWM
15
Vo1+
16
Vo1–
17
Vo4+
18
Vo4–
13
Vo2+
14
Vo2–
12
Vo3+
11
Vo3–
19
n.c.
Fig. 3
Block diagram 3, quadruple output types
Edition 1/10.99
5/18
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