Board Mountable
DC-DC Converters
IMX 35 Series
35 Watt DC-DC Converters
Wide input voltage ranges up to 75 V DC
2...4 isolated outputs up to 60 V DC
1500 V DC I/O electric strength test voltage
• 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 profile 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"
Approvals pending
47.8
1.88"
72.8
2.87"
8.9
0.35"
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 quad outputs, electrically isolated, from 3.3 V up to 60
V externally adjustable and with flexible load distribution. A
shut down input allows remote converter on/off. Features
include consistently high efficiency over the entire input
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
feature SELV outputs even if the voltage at the converter in-
put 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 up to an ambient temperature of –40...85°C in free air.
For extremely high vibration environments the case has
holes for screw mounting. Inhibit or open frame mounting
provide a high level of application specific engineering and
design-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 5/08.2001
R1
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
5
5
5
5
12
12
15
15
1
DC-DC Converters
IMX 35 Series
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
12
12
15
15
2.7
2.8
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
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
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
0.65
0.7
0.55
0.6
Output 4
U
o nom
I
o nom
[V DC]
[A]
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
5
5
5
5
5
5
12
12
15
15
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
1.35
1.4
1.35
1.4
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
9...36
18...75
9...36
18...75
Eff.
h
typ
[%]
84
84
87
87
87
87
81
83
84
86
84
86
81
83
84
86
84
87
86
87
86
88
87
88
87
89
88
89
Type
designation
20 IMX 35-05-05-8
40 IMX 35-05-05-8
20 IMX 35-12-12-8
40 IMX 35-12-12-8
20 IMX 35-15-15-8
40 IMX 35-15-15-8
20 IMX 35-03D05-8
3
40 IMX 35-03D05-8
3
20 IMX 35-03D12-8
3
40 IMX 35-03D12-8
3
20 IMX 35-03D15-8
3
40 IMX 35-03D15-8
3
20 IMX 35-05D05-8
3
40 IMX 35-05D05-8
3
20 IMX 35-05D12-8
3
40 IMX 35-05D12-8
3
20 IMX 35-05D15-8
3
40 IMX 35-05D15-8
3
20 IMX 35 D05D05-8
40 IMX 35 D05D05-8
20 IMX 35 D05D12-8
40 IMX 35 D05D12-8
20 IMX 35 D05D15-8
40 IMX 35 D05D15-8
20 IMX 35 D12D12-8
40 IMX 35 D12D12-8
20 IMX 35 D15D15-8
40 IMX 35 D15D15-8
Trim
1
Opt.
2
2.7
2.8
1.3
1.4
1.1
1.2
3.5
4.25
3.5
4.25
3.5
4.25
2.9
3.4
2.9
3.4
2.9
3.4
1.35
1.4
1.35
1.4
1.35
1.4
0.65
0.7
0.55
0.6
primary
primary
primary
primary
primary
primary
second.
second.
second.
second.
second.
second.
second.
second.
second.
second.
second.
second.
primary
primary
primary
primary
primary
primary
primary
primary
primary
primary
i, Z
i, Y
i, Z
i, Y
i, Z
i, Y
i, Z
i, Y
i, Z
i, Y
i, Z
i, Y
i, Z
2
3
For the units IMX 35-05-05, IMX 35-12-12, IMX 35-15-15 and all the quad versions with equal output voltages, the Trim input (pin 5) is
on the primary side and influences all outputs simultaneously while pin 18 is not connected. For the quad versions with unequal out-
put voltages (e.g. 40 IMX 35 D05D12-8) the Trim input (pin 5) influences only the first power train i.e. V
01
and V
04
. For the triple ver-
sions the Trim input (pin 18) is on the secondary side and influences the first output (V
01
) only.
For minimum quantity contact Power-One.
For lead times contact Power-One.
Edition 5/08.2001
R1
2/18
Board Mountable
Type Key
Double output units
DC-DC Converters
IMX 35 Series
20 IMX 35 - 12 - 12 -8
Input voltage range
U
i
9...36 V DC ........................................... 20
18...75 V DC ........................................... 40
Series ...................................................................... IMX 35
Output 1 of double types (5, 12, 15 V) ............... 05, 12, 15
Output 2 of double types (5, 12, 15 V) ............... 05, 12, 15
Operating ambient temperature range
T
A
–40...85°C .................................................. -8
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 (3.3, 5 V) ............................. 03, 05
Output 2/3 of triple types (3.3, 5 V) ............ D05, D12, D15
Operating ambient temperature range
T
A
–40...85°C .................................................. -8
Options:
Inhibit ............................................................ i
Base plated open frame .............................. Y
Open frame .................................................. Z
1
2
40 IMX 35 - 05 D05 -8 i Z
Quad output units
Input voltage range
U
i
9...36 V DC ........................................... 20
18...75 V DC ........................................... 40
Series ...................................................................... IMX 35
Output 1/4 of quad types (5, 12, 15 V) ....... D05, D12, D15
Output 2/3 of quad types (5, 12, 15 V) ...... D05, D12, D15
Operating ambient temperature range
T
A
–40...85°C .................................................. -8
Options:
Inhibit ............................................................ i
Open frame .................................................. Z
2
40 IMX 35 D05 D05 -8 i Z
1
2
20 IMX 35 triple output types.
All models except 20 IMX 35-triple output types.
Edition 5/08.2001
R1
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
double output types consist of two electrically isolated out-
puts Vo1, Vo2. Vo1 and Vo2 derive 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 by use of the Trim input on the primary side (See:
Block diagram, dual output types.)
The triple output types consist of 3 outputs Vo1, Vo2 and
Vo3. Vo1 (3.3 or 5.1 V) is generated by a power train using
state of the art Schottky diode (20 IMX 35) or a synchro-
nous rectifier technology (40 IMX 35) thus enabling high ef-
ficiency. 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 1 (U
o1
) is pro-
vided by 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 quad 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 inde-
pendent from the other one). Voltage regulation for each
pair of outputs is achieved with passive transformer feed-
back from the main transformer of each power train. Each
pair of outputs are restricted to being of the same output
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 Trim1/4 input influences only Vo1 and Vo4. See:
Block diagram, quad 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 drop below
typically 60% of
U
o nom
, the entire converter will shut down
and automatically restart in short intervals.
Overtemperature protection is provided, which will shut
down the converter in excessive overload conditions with
automatic restart.
03100
Vi+
4
PUL
1
Trim
5
W
6
Ref
7
SD
8
Vi–
2
n.c.
3
PWM
17
Vo1+
15
Vo1–
16
1
18
1
12
1
13
Vo2+
14
n.c.
11
Vo2–
19
n.c.
1
Internally
connected, leave open-circuit
Fig. 1
Block diagram 1, double output types
Edition 5/08.2001
R1
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/Trim1/4
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, quad output types
Edition 5/08.2001
R1
5/18
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