IMX35 Series: 35W DC-DC Converters
9-36V, 18-75V, 40-121V & 60-150V Inputs
Dual/Triple/Quad Outputs 3.3V, 5V, 12V & 15V
Wide input voltage ranges up to 150 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 I/O, 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/inhibit input
• Output voltages adjustable with flexible load
distribution
• Frequency synchronisation
• Outputs no-load, overload and short-circuit proof
• Operating ambient temperature from –40...110
°
C
• Thermal protection
• 3" x 2.5" case with 10.5 mm profile or 8.9 mm open
frame
• Basic insulation
• Flexible output possibilities between 3.3 V & 60 V
Safety according to IEC/EN 60950, UL 1950
LGA
Product Specifications
Aug 2002
47.8
1.88"
8.9
0.35"
72.8
2.87"
63.5
2.5"
10.5
0.41"
76.2
3"
Approvals pending
Summary
The IMX 35 series of board mountable 35 Watt DC-DC con-
verters has been designed according to industry require-
ments and standards. The converters are particularly suit-
able for use in mobile or stationary applications in trans-
port, railways, industry, or telecommunication where vari-
able input voltages or high transient voltages are prevalent.
Covering a total input voltage range from 9 V up to 150 V
with 4 different types. The units are available with up to
quadruple outputs (electrically isolated) from 3.3 V up to
60V 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 basic insulation.
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, operation to 110°C with airflow. 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 flex-
ibility.
Table of Contents
Page
Summary .......................................................................... 1
Type Survey and Key Data .............................................. 2
Type Key .......................................................................... 2
Functional Description ..................................................... 3
Electrical Input Data ......................................................... 4
Electrical Output Data ...................................................... 6
Page
Auxiliary Functions ........................................................... 9
Electromagnetic Compatibility (EMC) ............................ 11
Immunity to Environmental Conditions .......................... 12
Mechanical Data ............................................................ 13
Safety and Installation Instructions ................................ 14
Description of Option ..................................................... 15
AUG 13, 2002
Rev 1.0
www.power-one.com
Page 1 of 15
IMX35 Series: 35W DC-DC Converters
9-36V, 18-75V, 40-121V & 60-150V Inputs
Dual/Triple/Quad Outputs 3.3V, 5V, 12V & 15V
Type Survey and Key Data
Table 1: Type survey
Output 1
V
o nom
I
o nom
[V DC]
[A]
3.3
3.3
3.3
5.1
5.1
5.1
5
5
5
5
12
12
12
12
15
15
15
15
5
5
5
5
5
5
5
5
1
The
Product Specifications
Aug 2002
Output 2
V
o nom
I
o nom
[V DC]
[A]
5
12
15
5
12
15
5
5
5
5
12
12
12
12
15
15
15
15
12
12
12
12
15
15
15
15
1.35
0.7
0.6
1.4
0.7
0.6
1.35
1.4
1.4
1.4
0.65
0.7
0.7
0.7
0.55
0.6
0.6
0.6
0.65
0.7
0.7
0.7
0.55
0.6
0.6
0.6
Output 3
V
o nom
I
o nom
[V DC]
[A]
5
12
15
5
12
15
5
5
5
5
12
12
12
12
15
15
15
15
12
12
12
12
15
15
15
15
1.35
0.7
0.6
1.4
0.7
0.6
1.35
1.4
1.4
1.4
0.65
0.7
0.7
0.7
0.55
0.6
0.6
0.6
0.65
0.7
0.7
0.7
0.55
0.6
0.6
0.6
Output 4
V
o nom
I
o nom
[V DC]
[A]
-
-
-
-
-
-
5
5
5
5
12
12
12
12
15
15
15
15
5
5
5
5
5
5
5
5
-
-
-
-
-
-
1.35
1.4
1.4
1.4
0.65
0.7
0.7
0.7
0.55
0.6
0.6
0.6
1.35
1.4
1.4
1.4
1.35
1.4
1.4
1.4
Input voltage
V
i min
...V
i max
[V DC]
18...75
18...75
18...75
18...75
18...75
18...75
9...36
18...75
40...121
60...150
9...36
18...75
40...121
60...150
9...36
18...75
40...121
60...150
9...36
18...75
40...121
60...150
9...36
18...75
40...121
60...150
Eff.
η
typ
[%]
81
83
84
82
83
84
86
87
86
86
86
88
88
88
88
89
88
88
88
89
88
88
88
89
88
88
Type
designation
40 IMX 35-03D05-9
40 IMX 35-03D12-9
40 IMX 35-03D15-9
40 IMX 35-05D05-9
40 IMX 35-05D12-9
40 IMX 35-05D15-9
20 IMX 35 D05D05-9
40 IMX 35 D05D05-9
70 IMX 35 D05D05-8
110 IMX 35 D05D05-8
20 IMX 35 D12D12-9
40 IMX 35 D12D12-9
70 IMX 35 D12D12-8
110 IMX 35 D12D12-8
20 IMX 35 D15D15-9
40 IMX 35 D15D15-9
70 IMX 35 D15D15-8
110 IMX 35 D15D15-8
20 IMX 35 D05D12-9
40 IMX 35 D05D12-9
70 IMX 35 D05D12-8
110 IMX 35 D05D12-8
20 IMX 35 D05D15-9
40 IMX 35 D05D15-9
70 IMX 35 D05D15-8
110 IMX 35 D05D15-8
Trim
1
Opt.
2
4.15
4.15
4.15
3.25
3.25
3.25
1.35
1.4
1.4
1.4
0.65
0.7
0.7
0.7
0.55
0.6
0.6
0.6
1.35
1.4
1.4
1.4
1.35
1.4
1.4
1.4
second.
-8
i
Z
-8
i
Z
-8
i,Z
i
Z
-8
i,Z
i
Z
-8
i,Z
i
Z
-8
i,Z
i
Z
-8
i,Z
i
Z
second.
primary
primary
primary
primary
primary
Trim input (pin 5) on the primary side influences all outputs simultaneously on equal voltage types (eg D12D12) for unequal voltages (eg D05D12) it
only influences the power train Vo1/Vo4, while Trim1 (pin 18) on the secondary side influences the first output (V
o1
) only.
For minimum quantity contact Power-One, not all options immediately available.
2
TYPE KEY
20 IMX 35 D05 D05 -9 i Z
Input voltage range
U
i
9...36 V DC
18...75 V DC
40..121V DC
60..150V DC
........................................... 20
........................................... 40
........................................... 70
......................................... 110
Series ...................................................................... IMX 35
Output 1 of triple types ........................................... -03, -05
Output 1 & 4 of quad types
1 .................................
D05, D12, D15
Output 2 & 3 of quad types
1 .................................
D05, D12, D15
Operating ambient temperature range
T
A
–40...71°C ................................................... -9
–40...85°C (110°C ) .................................... -8
Options:
1
Dual
Inhibit ........................................................... -i
Open frame .................................................. Z
output models can be achieved by paralleling outputs
AUG 13, 2002
Rev 1.0
www.power-one.com
Page 2 of 15
IMX35 Series: 35W DC-DC Converters
9-36V, 18-75V, 40-121V & 60-150V Inputs
Dual/Triple/Quad Outputs 3.3V, 5V, 12V & 15V
Functional Description
The IMX35 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 two main types.
The triple output types consist of 3 outputs Vo1, Vo2, Vo3.
Vo1 (3.3 V or 5.1 V) is generated by a power train using
synchronous rectifier technology 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 1 (V
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.
90...105% of
V
o nom
. (See:
Block diagram, triple output
types)
Product Specifications
Aug 2002
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.)
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 90...105% of
V
o nom
is
possible via Trim input on the primary side.
03097a
03098
Vi+
4
PUL
1
n.c.
5
W
6
Ref
7
SD
8
Vi—
2
n.c.
3
PWM
Control
17
Vo1+
Vi+
4
16
n.c.
16
Vo1+
PUL
1
Trim
5
15
Vo1—
W
6
18
Trim1
Ref
7
15
Vo1—
PWM
17
Vo4+
SD
8
Vi—
2
13
Vo2+
18
Vo4—
n.c.
3
13
Vo2+
14
Vo2—
12
Vo3+
14
Vo2—
12
Vo3+
11
Vo3—
19
n.c.
11
Vo3—
19
n.c.
Fig. 1
Block diagram, triple output types
Fig. 2
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
V
o nom
, the entire converter will shut
down and automatically restart in short intervals.
Overtemperature protection is provided, this will shut down
the converter in excessive overload conditions with auto-
matic restart approximately in short intervals.
AUG 13, 2002
Rev 1.0
www.power-one.com
Page 3 of 15
IMX35 Series: 35W DC-DC Converters
9-36V, 18-75V, 40-121V & 60-150V Inputs
Dual/Triple/Quad Outputs 3.3V, 5V, 12V & 15V
Electrical Input Data
Product Specifications
Aug 2002
General conditions:
T
A
= 25°C, unless
T
C
is specified; Shut down pin left open circuit (not connected);Trim not connected.
Table 2: Input Data
Input
Characteristics
V
i
V
i nom
V
i sur
t
start up
Input voltage range
1
20 IMX
Conditions
T
A min
...T
A max
I
o
= 0...I
o nom
Abs. max input (3 s)
Worst case condition at
U
i min
and full load
U
i nom
resist load
I
o nom
capac. load
0.25
min
9
2
20
40
0.5
0.1
3
6
12
70
30
8
2
–10...0.7
open circuit or 2...20
approx. 10
12
approx. 220
B
6
70 IMX
Conditions
1
40 IMX
max
36
min
18
2
40
100
0.25
0.5
0.1
3
6
12
50
30
9
1.3
–10...0.7
open circuit or 2...20
approx. 10
6
approx. 220
B
6
110 IMX
max
121
min
60
2
110
150
170
0.25
0.5
0.1
3
12
30
30
7
6
12
20
30
7
0.5
–10...0.7
open circuit or 2...20
approx. 10
3.5
4
approx. 220
B
6
kΩ
mA
kHz
A
µF
V DC
mA
ms
s
typ
max
150
Unit
V DC
kΩ
mA
kHz
A
µF
V DC
mA
ms
s
typ
max
75
Unit
V DC
typ
Nominal input voltage
Repetitive surge voltage
Converter
Switch on
2
start-up time
SD high
Rise time
3
t
rise
I
i o
I
irr
I
inr p
C
i
U
SD
No load input current
Reflected ripple current
Inrush peak current
4
Input capacitance
Shut down voltage
I
o
= 0,
U
i min
...U
i max
I
o
= 0...I
o nom
U
i
=
U
i nom
for surge calculation
Unit shut down
Unit operating
R
SD
I
SD
f
s
u
i RFI
Input
Shut down input resistance
Input current if unit
shut down
Switching frequency
Input RFI level, conducted
For current calculations
U
i
min
...U
i max
U
i min
...U
i max
,
I
o
= 0...I
o nom
EN 55022
5
Characteristics
V
i
V
i nom
V
i sur
t
start up
Input voltage range
min
40
2
typ
Nominal input voltage
Repetitive surge voltage
Converter
Switch on
2
start-up time
SD high
Rise time
3
T
A min
...T
A max
I
o
= 0...I
o nom
Abs. max input (3 s)
Worst case condition at
U
i min
and full load
U
i nom
resist load
I
o nom
capac. load
70
0.25
0.5
0.1
t
rise
3
6
I
i o
I
irr
I
inr p
C
i
U
SD
No load input current
Reflected ripple current
Inrush peak current
4
Input capacitance
Shut down voltage
I
o
= 0,
U
i min
...U
i max
I
o
= 0...I
o nom
U
i
=
U
i nom
for surge calculation
Unit shut down
Unit operating
0.5
–10...0.7
open circuit or 2...20
approx. 10
R
SD
I
SD
f
s
u
i RFI
1
Shut down input resistance
Input current if unit
shut down
Switching frequency
Input RFI level, conducted
For current calculations
U
i
min
...U
i max
U
i min
...U
i max
,
I
o
= 0...I
o nom
EN 55022
5
approx. 220
B
6
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 Trim input. If the output voltage is set to a higher value,
V
i min
will be proportionately increased.
Input undervoltage lock-out at typ. 85% of
U
i min
.
Measured with resistive and max. admissible capacitive load.
Source impedance according to ETS 300132-2, version 4.3.
Measured with a lead length of 0.1 m, leads twisted.
External capacitor required.
Rev 1.0
www.power-one.com
Page 4 of 15
AUG 13, 2002
IMX35 Series: 35W DC-DC Converters
9-36V, 18-75V, 40-121V & 60-150V Inputs
Dual/Triple/Quad Outputs 3.3V, 5V, 12V & 15V
Inrush current
The inrush current has been kept as low as possible by
choosing a very small input capacitance. A series resistor
may be installed in the input line to further reduce this cur-
rent.
I
[A]
4
3
2
1
t
[µs]
0
10
20
30
40
50
60
70
80
90 100
04022
Product Specifications
Aug 2002
Input Transient Voltage Protection
A built-in suppressor diode provides effective protection
against input transients which may be caused for example
by short-circuits accross the input lines where the network
inductance may cause high energy pulses.
Table 4: Built-in transient voltage suppressor
Type
Breakdown
voltage
V
Br nom
[V]
39
100
151
176
Peak power
at 1 ms
P
p
[W]
1500
1500
600
600
Peak pulse
current
I
pp
[A]
22
9.7
2.9
2.5
20 IMX 35
40 IMX 35
70 IMX 35
110 IMX 35
Fig. 3
Typical inrush current at U
i nom
, P
o nom
versus time
(40 IMX 35). Source impedance according to
prETS 300132-2, version 4.3 at V
i nom
.
U
o
U
o nom
t
rise
04008
For very high energy transients as for example to achieve
IEC/EN 61000-4-5 or ETR 283 (19 Pfl1) compliance (as per
table:
Electromagnetic Immunity)
an external inductor and
capacitor are required. The components should have simi-
lar characteristics as listed in table:
Components for exter-
nal circuitry for IEC/EN 61000-4-5, level 2 or ETR 283
(19Pfl1) compliance.
Note: The suppressor diode D is only necessary for
20 IMX 35 types.
Table 5: Components for external circuitry for IEC/EN
61000-4-5, level 2 or ETR 283 (19Pfl1) compliance.
Type
20 IMX 35
40 IMX 35
70 IMX 35
Inductor (L)
22
µH/5A
68
µH/2.7
A
100
µH/1
A
Capacitor (C)
470
µF/40
V
2 x 100
µF/100
V
2 x 82
µF/200
V
2 x 82
µF/200
V
04036
t
start up
t
Fig. 4
Converter start-up and rise time
Reverse Polarity Protection
The built-in suppressor diode also provides for reverse po-
larity protection at the input by conducting current in the re-
verse direction. An external fuse is required to limit this cur-
rent.
Table 3: Recommended external fuses
Converter type
20 IMX 35
40 IMX 35
70 IMX 35
110 IMX 35
Fuse type
F8.0A
F4.0A
F2.0A
F1.5A
Diode (D)
1.5 k E47A
-
-
-
110 IMX 35 150
µH/0.8
A
L
Vi+
C
+
D
Vi–
Fig. 5
Example for external circuitry to comply with IEC/EN
61000-4-5 or ETR 283 (19Pfl1); the diode D is only neces-
sary for 20 IMX 35 types.
AUG 13, 2002
Rev 1.0
www.power-one.com
Page 5 of 15
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