Board Mountable
DC-DC Converters
IMX 35 Series
35 Watt DC-DC Converters
Wide input voltage ranges up to 75 V DC
2...4 outputs up to 60 V DC
1500 V DC I/O electric strength test voltage
• 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
distribution
• 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
Safety according to IEC/EN 60950, UL 1950
LGA
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"
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
1/18
Edition 3/4.2000
Board Mountable
Type Survey and Key Data
Table 1: Type survey
Output 1
U
o nom
I
o nom
[V DC]
[A]
5
5
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
2.7
2.8
1.3
1.4
1.1
1.2
4.25
4.25
4.25
4.25
4.25
4.25
3.3
3.4
3.3
3.4
3.3
3.4
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
12
12
15
15
5
5
12
12
15
15
5
5
12
12
15
15
5
5
12
12
15
15
2.6
2.7
1.3
1.4
1.1
1.2
1.3
1.35
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 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
-
-
-
-
-
-
1.3
1.35
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
IMX 35 Series
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...36
18...75
9...36
18...75
Eff.
h
typ
[%]
84
84
87
87
87
87
83
83
86
86
86
86
83
83
86
86
86
87
86
87
87
89
88
89
Type
designation
20 IMX 35-05-05-9
40 IMX 35-05-05-9
20 IMX 35-12-12-9
40 IMX 35-12-12-9
20 IMX 35-15-15-9
40 IMX 35-15-15-9
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
Trim
Opt.
primary
primary
primary
second.
-8
Z
i
second.
primary
primary
primary
Trim
The Trim input (pin 5) on the primary side influences all outputs simultaneously, while Trim1 (pin 18) on the secondary side
influences the first output (U
o1
) only.
Edition 3/4.2000
2/18
Board Mountable
Type Key
Dual output units
DC-DC Converters
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 .................................... 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 3/4.2000
3/18
Board Mountable
Functional Description
DC-DC Converters
IMX 35 Series
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. Vo1 (3.3 or 5.1 V) is generated by
a power train using synchronous rectifier technology thus
enabling high efficiency. Also there is active magnetic feed-
back on this output via a pulse transformer which results in
very tight and reliable regulation of the output voltage. The
other two outputs Vo2 and Vo3 are electrically isolated dou-
ble 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 1 (U
o1
) is provided by the Trim1
pin referenced to the secondary side and allows for pro-
gramming 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.
12
n.c.
13
Vo2+
14
n.c.
11
Vo2—
19
n.c.
16
n.c.
Fig. 1
Block diagram 1, double output types
Edition 3/4.2000
4/18
Board Mountable
Vi+
4
PUL
1
n.c.
5
W
6
Ref
7
SD
1
Vi—
2
n.c.
3
PWM
DC-DC Converters
03097
IMX 35 Series
17
Vo1+
16
n.c.
15
Vo1—
Control
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.
3
PWM
16
Vo1+
15
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 3/4.2000
5/18
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