®
BCD20009-G Rev AA Page 1 of 16 www.power-one.com
IMX35 Series Data Sheet
35-Watt Quad-Output DC-DC Converters
Description
The IMX35 Series of board-mountable, 35 Watt DC-DC
converters has been designed according to industry
requirements and standards. The converters are particularly
suitable for use in mobile or stationary applications in
transport, railways, industry, or telecommunication, where
variable input voltages or high transient volt ages are prevalent.
Covering a total input voltage range from 9 V up to 150 V with 4
different models. The units are available with up to quadruple
outputs (electrically isolated) from 5 V 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 response to load and line
changes.
The converters are designed and built according to the
international safety standards IEC/EN/UL 60950, and
approved by TÜV, UL, and cUL. The IMX35 models provide
basic insulation.
The circuit is comprised of 2 planar magnetics devices, and all
components are automatically assembled and securly
soldered onto a single PCB without any wire connection.
Magnetic feedback ensures maximum reliability and
repeatability in the control loop over all operating conditions.
Careful considerations of possible thermal stresses ensure the
absence of hot spots providing long life in environment s, where
temperature cycles are present. The thermal design without
using any potting material allows operation at full load up to an
ambient temperature of 71 °C in free air and operation up to
110 °C with airflow. For extremely high vibration environments
the case has holes for screw mounting.
Features
•RoHS lead-free-solder and lead-solder-exempted
products are available.
• Extremely wide input voltage ranges up to 150 VDC
• 4 outputs up to 60 V
• 1200 to 1800 VAC i/o electric strength test
• Electrical isolation also between outputs
• Immunity to IEC/EN 61000- 4-2,-3,-4,-5, -6
• Programmable input undervoltage lockout
• Shut down/inhibit input
• Adjustable output voltages with flexible load distribution
• Frequency synchronization
• Outputs no-load, overload, and short-circuit proof
• Operating ambient temperature from –40 to 85 °C
• Thermal protection
• 3" × 2.5" case with 10.5 mm profile or 8.9 mm open frame
• Basic insulation
• Flexible output possibilities between 5 V and 60 V
Table of Contents Page Page
72.8
2.87"
47.8
1.88"
8.9
0.35"
76.2
3"
63.5
2.5"
10.5
0.41"
Safety according to IEC/EN 60950-1 and UL 60950-1
Description .............................................................................1
Model Selection .....................................................................2
Functional Description ...........................................................3
Electrical Input Data...............................................................4
Electrical Output Data ............................................................6
Auxiliary Functions.................................................................9
Electromagnetic Compatibility (EMC) .................................. 11
Immunity to Environmental Conditions ................................12
Mechanical Data ..................................................................13
Safety and Installation Instructions ......................................14
Options.................................................................................15
EC Declaration of Conformity ..............................................16
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BCD20009-G Rev AA Page 2 of 16 www.power-one.com
IMX35 Series Data Sheet
35-Watt Quad-Output DC-DC Converters
40 IMX35 D05 D05 -8 i Z G1
Input voltage range Vi
9 to 36 VDC ........................................... 20
18 to 75 VDC ........................................... 40
40 to 121 VDC ........................................... 7 0
60 to 150 VDC ......................................... 110
Series.......................................................................IMX35
Outputs 1 and 4 of quad types................... D05, D12, D15
Outputs 2 and 3 of quad types................... D05, D12, D15
Operating ambient temperature range
TA = –40 to 85 °C (110 °C)........................ -8
Options: Inhibit ........................................................... -i
Open frame.................................................. Z
RoHS compliant for all six substances........ G1
1G is allways placed at the end of the part number.
Model Selection
Table 1: Model Selection
Output 1 Output 2 Output 3 Output 4 Input voltage Eff. Model Trim2Opt.3
Vo nom Io nom Vo nom Io nom Vo nom Io nom Vo nom Io nom Vi min to Vi max ηη
ηη
η1
[VDC] [A] [VDC] [A] [VDC] [A] [VDC] [A] [VDC] [%]
5 1.35 5 1.35 5 1.35 5 1.35 9 to 36 86 20IMX35D05D05-8 primary i
5 1.4 5 1.4 5 1.4 5 1.4 18 to 75 87 40IMX35D05D05-8 Z
5 1.4 5 1.4 5 1.4 5 1.4 40 to 121 86 70IMX35D05D05-8 G
5 1.4 5 1.4 5 1.4 5 1.4 60 to 150 86 110IMX35D05D05-8
12 0.65 12 0.65 12 0.65 12 0.65 9 to 36 86 20IMX35D12D12-8 primary
12 0.7 12 0.7 12 0.7 12 0.7 18 to 75 88 40IMX35D12D12-8
12 0.7 12 0.7 12 0.7 12 0.7 40 to 121 88 70IMX35D12D12-8
12 0.7 12 0.7 12 0.7 12 0.7 60 to 150 88 110IMX35D12D12-8
15 0.55 15 0.55 15 0.55 15 0.55 9 to 36 88 20IMX35D15D15-8 primary
15 0.6 15 0.6 15 0.6 15 0.6 18 to 75 89 40IMX35D15D15-8
15 0.6 15 0.6 15 0.6 15 0.6 40 to 121 88 70IMX35D15D15-8
15 0.6 15 0.6 15 0.6 15 0.6 60 to 150 88 110IMX35D15D15-8
5 1.35 12 0.65 12 0.65 5 1.35 9 to 36 88 20IMX35D05D12-8 primary
5 1.4 12 0.7 12 0.7 5 1.4 18 to 75 89 40IMX35D05D12-8
5 1.4 12 0.7 12 0.7 5 1.4 40 to 121 88 70IMX35D05D12-8
5 1.4 12 0.7 12 0.7 5 1.4 60 to 150 88 110IMX35D05D12-8
5 1.35 15 0.55 15 0.55 5 1.35 9 to 36 88 20IMX35D05D15-8 primary
5 1.4 15 0.6 15 0.6 5 1.4 18 to 75 89 40IMX35D05D15-8
5 1.4 15 0.6 15 0.6 5 1.4 40 to 121 88 70IMX35D05D15-8
5 1.4 15 0.6 15 0.6 5 1.4 60 to 150 88 110IMX35D05D15-8
1
Typ. efficiency at TA = 25 °C, Vo nom, Io nom
2The Trim input (pin 5) on the primary side influences all outputs simultaneously on equal-voltage models (e.g., D12D12); for unequal
voltages (e.g., D05D12), Trim1 influences only the first power train Vo1/Vo4.
3For minimum quantity and lead times contact Power-One.
Part Number Description
Product Marking
Converters without option Z are marked with basic type
designation, input and output voltages and currents,
applicable safety approval and recognition marks, Power-One
patent nos., company logo, date code, and serial no.
®
BCD20009-G Rev AA Page 3 of 16 www.power-one.com
IMX35 Series Data Sheet
35-Watt Quad-Output DC-DC Converters
Functional Description
The IMX35 converters are comprised of 2 feedback-controlled
interleaved-switching flyback power trains using current mode
PWM (pulse width modulation).
Each converter consists of 4 electrically isolated outputs
deriving from 2 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 the
power train. Each pair of outputs has the same output voltage
(i.e. D05, D12, etc.). If both power trains have the same output
Fig. 1
Block diagram of quad output models
voltage (e.g., D12D12), all outputs may be simultaneously
adjusted by the Trim input (pin 5). In case of different output
voltages (e.g., D05D15), the Trim1 input influences only Vo1
and Vo4.
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 Vo nom, the entire converter will shut down and
automatically restart in short intervals (hiccup mode).
The incorporated overtemperature protection shuts down the
converter in excessive overload conditions with automatic
restart.
PWM
4
8
1
Vi+
SD
PUL
5
Trim/Trim1
6
W
7
Ref
2
Vi–
16
15
17
18
13
14
12
11
Vo4
–
Vo1+
Vo1–
Vo4+
Vo2+
Vo2
–
Vo3+
Vo3
–
03098a
3
n.c.
19
n.c.
®
BCD20009-G Rev AA Page 4 of 16 www.power-one.com
IMX35 Series Data Sheet
35-Watt Quad-Output DC-DC Converters
Electrical Input Dat a
General conditions:
TA = 25°C, shut down and Trim pin left open-circuit (not connected), unless specified.
Table 2: Input Data
Input 20IMX 40IMX Unit
Characteristics Conditions min typ max min typ max
ViInput voltage range 1TA min to TA max 9 2 36 18 2 75 VDC
Vi nom Nominal input voltage Io = 0 to Io nom 20 40
Vi sur Repetitive surge voltage Abs. max input (3 s) 40 100
tstart up Converter Switch on Worst case condition at 0.25 0.5 0.25 0.5 s
start-up time 2 SD high Vi min and full load 0.1 0.1
trise Rise time 3 Vi nom resist load 3 3 m s
Io nom capac. load 6 12 6 12
Ii o No load input current Io = 0, Vi min to Vi max 70 50 mA
Iirr Reflected ripple current Io = 0 to Io nom 30 30 mApp
Iinr p Inrush peak current 4 Vi = Vi nom 89A
CiInput capacitance for surge calculation 2 1.3 µF
VS
–D
– Shut down voltage Converter shut down –10 to 0.7 –10 to 0.7 VDC
Converter operating open circuit or 2 to 20 open circuit or 2 to 20
RS
–D
– Shut down input resistance For current calculations approx. 10 approx. 10 kΩ
IS
–D
– Input current at shut down Vi min to Vi max 12 6 mA
fsSwitching frequency Vi min to Vi max, Io = 0 to Io nom approx. 220 approx. 220 kHz
Input 70IMX 110IMX Unit
Characteristics Conditions min typ max min typ max
ViInput voltage range 1TA min to TA max 40 2 121 602150 VDC
Vi nom Nominal input voltage Io = 0 to Io nom 70 110
Vi sur Repetitive surge voltage Abs. max input (3 s) 150 170
tstart up Converter Switch on Worst case condition at 0.25 0.5 0.25 0.5 s
start-up time 2 SD high Vi min and full load 0.1 0.1
trise Rise time 3 Vi nom resist load 3 3 ms
Io nom capac. load 6 12 6 12
Ii o No load input current Io = 0, Vi min to Vi max 30 20 mA
Iirr Reflected ripple current Io = 0 to Io nom 30 30 mApp
Iinr p Inrush peak current 4 Vi = Vi nom 77A
CiInput capacitance for surge calculation 0.5 0.5 µF
VS
–D
– Shut down voltage Converter shut down –10 to 0.7 –10 to 0.7 VDC
Converter operating open circuit or 2 to 20 open circuit or 2 to 20
RS
–D
– Shut down input resistance For current calculations approx. 10 approx. 10 kΩ
IS
–D
– Input current at shut down Vi min to Vi max 3.5 4 mA
fsSwitching frequency Vi min to Vi max, Io = 0 to Io nom approx. 220 approx. 220 kHz
1Vi min will not be as stated if Vo is increased above Vo nom by use of Trim input. If the output voltage is set to a higher value, Vi min will
be proportionately increased.
2Input undervoltage lockout at typ. 85% of Vi min.
3Measured with resistive and max. admissible capacitive load.
4Source impedance according to ETS 300132-2, version 4.3.
5Measured with a lead length of 0.1 m, leads twisted.
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BCD20009-G Rev AA Page 5 of 16 www.power-one.com
IMX35 Series Data Sheet
35-Watt Quad-Output DC-DC Converters
Reverse Polarity Protection
The built-in suppressor diode also provides for reverse polarity
protection at the input by conducting current in the reverse
direction. An external fuse is required to limit this current.
Table 3: Recommended external fuses in the non-earthed
input line
Converter model Fuse type
20IMX35 F8.0A
40IMX35 F4.0A
70IMX35 F2.0A
110IMX35 F1.5A
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 in order to further reduce this
current.
Fig. 2
Typical inrush current at Vi nom, Po nom versus time (40IMX35).
Source impedance according to ETS 300132-2 at Vi nom.
Fig. 3
Converter start-up and rise time
Fig. 4
Example for external circuitry to comply with IEC/EN 61000-
4-5; the diode D is only necessary for 20IMX35 models.
For very high energy transients as for example to achieve
IEC/EN 61000-4-5 compliance (as per table Electromagnetic
Immunity) an external inductor and capacitor are required. The
components should have similar characteristics as listed in
table below.
Table 5: Components for external circuitry for IEC/EN
61000-4-5, level 2
Model Inductor (L) Capacitor (C) Diode (D)
20IMX35 22 µH/5 A 470 µF/40 V 1.5 k E47A
40IMX35 68 µH/2.7 A 2 x 100 µF/100 V -
70IMX35 100 µH/1 A 2 x 82 µF/200 V -
110IMX35 150 µH/0.8 A 2 x 82 µF/200 V -
Input Transient Voltage Protection
A built-in suppressor diode provides effective protection
against input transients, which may be generated for example
by short-circuits across the input lines, where the network
inductance may cause high energy pulses.
Table 4: Built-in transient voltage suppressor
Model Breakdown Peak power Peak pulse
voltage at 1 ms current
VBr nom [V] Pp [W] Ipp [A]
20IMX35 39 1500 22
40IMX35 100 1500 9.7
70IMX35 151 600 2.9
110IMX35 176 600 2.5
t
04022b
020 40 60 80 100 µs
4
3
2
1
A
V
o nom
V
o
t
startup
t
rise
t
04008b
Vi+
Vi–
C
L
D
+
04036a
®
BCD20009-G Rev AA Page 6 of 16 www.power-one.com
IMX35 Series Data Sheet
35-Watt Quad-Output DC-DC Converters
Electrical Output Data
General conditions:
– TA = 25 °C, unless TC is specified
– Shutdown pin left open-circuit (not connected)
– Trim not connected
Table 6: Output data for double-output power trains (Vo1/Vo4 or Vo2/Vo3, i.e. each power train has 2 outputs)
Output 2 x 5 V 2 x 12 V 2 x 15 V Unit
Characteristics Conditions min typ max min typ max min typ max
Vo1 Output voltage Vi nom 4.95 5.05 11.88 12.12 14.85 15.15 VDC
Vo2 Io = 0.5 Io nom 4.94 5.06 11.86 12.14 14.82 15.18
Io nom Output current 20IMX Vi min to Vi max 2 x 1.35 2 x 0.65 2 x 0.55 A
40IMX 2 x 1.4 2 x 0.70 2 x 0.60
70IMX 2 x 1.4 2 x 0.70 2 x 0.60
110IMX 2 x 1.4 2 x 0.70 2 x 0.60
IoL Current limit 1 20IMX Vi nom, TC = 25 °C 3.5 1.8 1.5
40IMX Vo = 93% Vo nom 3.8 2.0 1.7
70IMX 3.8 2.0 1.7
110IMX 3.8 2.0 1.7
∆VoLine regulation Vi min to Vi max, Io nom ±1 ±1 ±1 %
∆Vo l Load regulation Vi nom ±3 ±3 ±3
Io = (0.1 to 1) Io nom
Vo1/2 Output voltage noise Vi min to Vi max 280 120 150 mVpp
Io = Io nom 340 60 70
Vo L Output overvoltage limit. 4 Min. load 1% 115 130 115 130 115 130 %
Co ext Admissible capacitive load 4000 470 330 µF
Vo d Dynamic Voltage deviat. Vi nom ±250 ±480 ±520 mV
tdload Recovery time Io nom ↔1/2 Io nom 0.75 0.75 0.75 ms
regulation
αVo Temperature coefficient Vi min to Vi max ±0.02 ±0.02 ±0.02 %/K
∆Vo/∆TCIo = (0.1 to 1) Io nom
1Both outputs connected in parallel. The current limit is primary side controlled. In the event of a sustained overload condition the
thermal protection may cause the converter to shut down (restart on cool-down).
2BW = 20 MHz, measured with an external capacitor of 1 µF across each output pin.
3Measured with a probe according to EN 61204
4The overvoltage protection is via a primary side second regulation loop, not tracking with Trim control.
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BCD20009-G Rev AA Page 7 of 16 www.power-one.com
IMX35 Series Data Sheet
35-Watt Quad-Output DC-DC Converters
Fig. 5
Maximum allowed output power versus ambient
temperature.
Overtemperature Protection
The converter is protected against possible overheating by
means of an internal temperature monitoring circuit. It shuts
down the converter above the internal temperature limit and
attempts to automatically restart. This feature prevents
excessive internal temperature building up which could occur
under heavy overload conditions.
Thermal Considerations
If a converter, mounted on a PCB, is located in free, quasi-
stationary air (convection cooling) at the indicated maximum
ambient temperature TA max (see table Temperature
specifications) and is operated at its nominal input voltage and
output power, the case temperature TC measured at the
measuring point of case temperature (see Mechanical Data)
will approach the indicated value TC max after the warm-up
phase. However, the relationship between TA and TC depends
heavily on the conditions of operation and integration into a
system. The thermal conditions are influenced by input
voltage, output current, airflow, temperature of surrounding
components and the surfaces and properties of the printed
circuit board. TA max is therefore only an indicative value, and
under practical operating conditions, the ambient temperature
TA may be higher or lower than this value.
Caution: The case temperature TC measured at the measuring
point of case temperature TC (see Mechanical Data) may under no
circumstances exceed the specified maximum value. The installer
must ensure that under all operating conditions TC remains within
the limits stated in the table Temperature specifications.
The converters provide the specified output power with free air
convection cooling. In the upper temperature range the output
power derating below should be observed.
1.0
0.8
0.6
0.4
0
0.2
20
40 60 80
100 °C
P
o
/P
o max
11047-X35
T
A
0.5 m/s
=
200 LFM
natural cooling
Short Circuit Behavior
The current limit characteristic shuts down the converter
whenever a short circuit is applied to an output. It acts self-
protecting and automatically recovers after removal of the
overload condition (hiccup mode).
Fig. 6
Overload switch off (hiccup mode), typical values.
Connection in Series
The outputs of one or several double output power trains may
be connected in series without any precautions.
Connection in Parallel
Several outputs of the same converter with equal output
voltage (e.g., 5 V / 5 V) can be connected in parallel and will
share their output currents almost equally.
If outputs from the same converter are being paralleled
together, it is recommended that outputs from the same power
trains are connected together first.
Note: A separate application note is available for uses when all
outputs are paralleled together.
Parallel operation of several converters with the same output
voltage may cause start-up problems at initial st art-up. This is only
advisable in applications where one converter is able to deliver the
full load current as is required in true redundant systems. It is
recommended not to parallel more than three units at full load.
70
100
V
o
[%]
t
05041b
0.3 s
overload short-circuit condition
switch-off
0
®
BCD20009-G Rev AA Page 8 of 16 www.power-one.com
IMX35 Series Data Sheet
35-Watt Quad-Output DC-DC Converters
Fig. 8
Cross load regulation (typ.) on power train 1. Vo4 versus Io1
Fig. 9
Flexible load distribution (typ.) on power train 1 of a
40IMX35D12D12-8:
Vo1 versus Io1, Io4 = 0.5 Io4 nom
Fig. 10
Efficiency versus input voltage and load. Typical values
(40IMX35D12D12-8)
Fig. 11
Efficiency versus input voltage and load. Typical values
(20IMX35D12D12-8)
Fig. 7
Vo versus Io (typ.) of double-output power trains, with both
outputs in parallel (e.g., Vo1/4 of a 40IMX35D12D12)
Typical Performance Curves
General conditions:
– TA = 25°C, unless TC is specified.
– Shut down and Trim pin left open-circuit.
8
9
10
11
12
13
V
o
[V]
0.5 1 1.5 2 A I
o total
0
05020-X35
11.5
12
12.5
13
13.5
V
o4
[V]
0.06 0.2 0.3 0.4 0.5 0.6 0.7 A
0
.
1
05164b
I
o4
= 0.35 A
I
o4
= 0.035 A
I
o1
Vo1, Vo4 [V]
Io1/Io1 nom
05039b
14
13
12
11
10 0 0.25 0.5 0.75 11.5
1.25
Vo1
Vo4
60
70
80
90
η [%]
50 75 100 % P
o
P
o total
25
05153a
V
i min
V
i nom
60
70
80
90
η [%]
50 75 100 % P
o
P
o tota
l
25
05152a
V
i min
V
i nom
®
BCD20009-G Rev AA Page 9 of 16 www.power-one.com
IMX35 Series Data Sheet
35-Watt Quad-Output DC-DC Converters
Table 7: Rext1 for Vo > Vo nom;
approximate values (Vi nom, Io = 0.5 Io nom)
Vo [% Vo nom]Rext [k ΩΩ
ΩΩ
Ω]
Trim [kΩΩ
ΩΩ
Ω] Trim1 [kΩΩ
ΩΩ
Ω]
105 to 108 (107 typically) 0 0
105 10 17
102 62 110
100 ∞∞
Auxiliary Functions
Adjustable Output Voltage
As a standard feature, the IMX35 offer adjustable output
voltages in the range of 85 to 105% of Vo nom. Fig. 12 shows the
schematic diagram for the adjustment of quad-output models.
All models with equal output voltages have the trim function
connected to pin 5 referenced to the primary side, influencing
all outputs simultaneously. However , the Trim1 input of models
with different output voltage on the power trains influences only
the first power train.
Fig. 12
Output voltage control by means of the Trim input
Table 8: Vo versus Vext for Vo = 85 to 105% Vo nom;
typical values (Vi nom, Io = 0.5 Io nom)
Vo [% Vo nom]Vext [V]
Trim [V] Trim 1 [V]
>105 0 0
102 1.8 1.5
100 2.5 2.5
95 4.3 4.25
90 6.2 6.2
85 8 8
Synchronization (W)
It is possible to synchronize the switching frequency of one or
more converters to an external symmetrical clock signal. If this
option is required, consult factory for full application details.
This logic input W can be used to synchronize the oscillator to
an external frequency source. This signal is edge-triggered
with TTL thresholds, and requires a source frequency of 490 to
540 kHz (duty cycle 10 to 90%). The external source frequency
is internally divided by 2 to define the switching frequency for
the converter. If unused, this pin can be connected to V1– (pin
2) or left open-circuit.
Reference Output (Ref)
The converter provides a stable 5 V (±0.1 V) reference signal
on pin 7 (Ref). The output is protected by a 1 kΩ resistor. The
signal may be used also in conjunction with the Trim input (pin
5) as a limited external voltage reference.
It is recommended to connect a filter capacitor (0.1 µF)
between Ref and Vi–, if Ref is used.
Shutdown
The outputs of the converters may be enabled or disabled by
means of a logic signal (TTL, CMOS, etc.) applied to shut
down (pin 8). If the shut down function is not required, then pin
8 should be left open-circuit:
Converter operating: 2.0 to 20 V
Converter disabled: –10 to 0.7 V
Adjustment by means of an external resistor Rext:
Adjustment of the output voltage by means of an external
resistor Rext is possible within the range of 100 to 105% of
Vo nom. Rext should be connected between T rim (pin 5) and V i–
(pin 2). The following table indicates suitable resistor values
for typical output voltages under nominal conditions (Vi nom, Io
= 0.5 Io nom).
Note: Connection of Rext to Vi+ may damage the converter.
Adjustment by means of an external voltage source Vext
For external output voltage adjustment in the range 85 to
105% of Vo nom a voltage source Vext (0 to 20 V) is required,
connected to Trim or Trim1 (pin 5) and Vi–. The table below
indicates typical values Vo versus Vext. Applying a control
voltage of 15 to 20 V will set the converter into the hiccup
mode. Direct paralleling of the Trim pins of converters of the
same type connected in parallel is feasible.
Trim
Vo1+
Vo2–
+
Vext
–
Vi+
Vi–
Rext
Vo1–
Vo2+
06137b
Control
circuit
V
ref
= 2.5 V
4
5
2
16
15
13
11
®
BCD20009-G Rev AA Page 10 of 16 www.power-one.com
IMX35 Series Data Sheet
35-Watt Quad-Output DC-DC Converters
Progr. Input Undervoltage Lockout PUL
A special feature of these converters is the accurate
undervoltage lockout protection, which protects the converter
(and the system) from large currents caused by operation at
low voltages. This ensures easier start-up in distributed power
systems.
Fig. 13
If the inhibit is not used, the inhibit pin should be connected
to Vi–.
Vi+
Vi–
i
06138a
4
8
2
Option i: Inhibit (Negative Shutdown Logic)
The output of the converter may be enabled or disabled by
means of a logic signal (TTL, CMOS, etc.) applied to the inhibit
pin 8. No output voltage overshoot will occur, when the
converter is turned on. If the inhibit function is not required the
inhibit (pin 8) should be connected to Vi– to enable the output
(active low logic, fail safe). Voltage on pin 8:
Converter operating: –10 V to 0.8 V
Converter disabled: 2.4 V to 20 V or left
open-circuit
The undervoltage lockout levels may be programmed by use of
an external resistor RPUL to increase the preset levels as
indicated in the table below.
Table 10: Typical values for RPUL and the respective lockout
voltage for input voltage.
20IMX35 40IMX35
RPUL [kΩΩ
ΩΩ
Ω]Vi min [V] RPUL [k ΩΩ
ΩΩ
Ω]Vi min [V]
∞≤8∞≤15.5
39 10 43 22
19 12 16 26
13 14 10 28
9.1 16 0 32
70IMX35 110IMX35
RPUL [kΩΩ
ΩΩ
Ω]Vi min [V] RPUL [k ΩΩ
ΩΩ
Ω]Vi min [V]
∞31 ∞42
270 40 270 50
110 50 120 60
80 55 51 75
Table 9: Turn on and turn off voltage
Model Trigger level Hysteresis Uni t
20IMX35 7 to 8 <0.5 V
40IMX35 14 to 15.5 <1
70IMX35 31 to 34 <3
110IMX35 42 to 50 <8
®
BCD20009-G Rev AA Page 11 of 16 www.power-one.com
IMX35 Series Data Sheet
35-Watt Quad-Output DC-DC Converters
Electromagnetic Immunity
Table 11: Immunity type tests
Phenomenon Standard Class Coupling Value Waveform Source Test In Per- 2
Level mode 1 applied Imped. procedure oper. form.
Electrostatic IEC/EN 2 contact discharge 4000 Vp1/50 ns 330 Ω10 positive and yes B
discharge 61000-4-2 (Trim pin open) 10 negative
to case 3 air discharge 8000 Vpdischarges
(Trim pin open)
Electromagnetic IEC/EN 3 3 antenna 10 V/m AM 80% n.a. 80 to 1000 MHz yes A
field 61000-4-3 1 kHz
ENV 50204 3 antenna 10 V/m PM, 5 0% duty n.a. 900 MHz yes A
cycle, 200 Hz
repetition frequ.
Electrical fast IEC/EN 4 direct +i / – i 4000 Vpbursts of 5/5 0 ns 50 Ω60 s positive, yes B
transients/burst 61000-4-4 2.5/5 kHz 60 s negative
over 15 ms, transients per
burst period coupling mode
300 ms
Surges IEC/EN 3 4 +i/–i 2000 Vp1.2/50 µs 2 Ω5 pos. and 5 neg. yes B
61000-4-5 surges
EN 50155: A 5 +i /c, – i/ c 1800 Vp5/50 µs 100 Ωyes B
2001 B 6 +i /c, – i / c 8400 Vp0.05/0.1 µs 100 Ωyes B
RF Conducted IEC/EN 3 +i /–i 10 VAC AM modulated 50 Ω0.15 to 80 MHz yes A
immunity 61000-4-6 (140 dBµV) 80%, 1 kHz 150 Ω
1i = input, o = output.
2A = normal operation, no deviation from specification, B = temporary deviation from specs. possible.
3Corresponds to EN 50121-3-2:2000, table 9.1
4External components required; see fig. 4
5Corresponds to EN 50155:1995, waveform D
6Corresponds to EN 50155:1995, waveform G
typically occur in many installations, but especially in battery-
driven mobile applications.
Electromagnetic Comp atibility (EMC)
A suppressor diode together with an input filter form an
effective protection against high input transient volt ages which
Fig. 14
Typical disturbance voltage
(quasi-peak) at the input
according to EN 55011/22,
measured at Vi nom and Io nom.
Output leads 0.1 m, twisted
(40IMX35D12D12-8).
Electromagnetic Emission
07020a
EN 55022 A
EN 55022 B
90
8
0
7
0
60
50
40
3
0
20
10
0
0
.01
0
.05
0.1
0.5
1
2
5
10
20
30
[
dBµV]
MH
z
0
.02
®
BCD20009-G Rev AA Page 12 of 16 www.power-one.com
IMX35 Series Data Sheet
35-Watt Quad-Output DC-DC Converters
Fig. 15
External circuitry to comply with EN 55011/55022, level B,
radiated
Table 12: Input filter components for EN 55011/55022,
level B, radiated (30 to 1000 MHz)
Type Current compensated choke
20IMX35 Murata PLH1OA series 7003R6P02
40IMX35 Murata PLH1OA series 1612R1P02
70IMX35 Murata PLH1OA series 2911R2P02
110 IMX35 Murata PLH1OA series 3711R0P02
Radiated Emissions
Radiated emission requirements according to EN 55011/
55022, class B, can be achieved by adding an external
common mode choke and for 20 I MX3 5 models an additional
capacitor (4.7 µF/ 50 V). The filter components should be
placed as close as possible to the input of the converter; see
figure below.
Vi+
Vi–
L
+
–
Converter
07114b
Immunity to Environment al Conditions
Table 13: Environmental testing
Test Method Standard Test Conditions Status
Cab Damp heat IEC/EN 60068-2-78 Temperature: 40 ±2 °C Converter
steady state MIL-STD-810D sect. 507.2 Relative humidity: 93 +2/-3 % not
Duration: 56 days operating
Ea Shock IEC/EN 60068-2-27 1 Acceleration amplitude: 100 gn = 981 m/s2Converter
(half-sinusoidal) MIL-STD-810D sect. 516.3 Bump duration: 6 ms operating
Number of bumps: 18 (3 each direction)
Eb Bump IEC/EN 60068-2-29 Acceleration amplitude: 40 gn = 392 m/s2Converter
(half-sinusoidal) MIL-STD-810D sect. 516.3 Bump duration: 6 ms operating
Number of bumps: 6000 (1000 each direction)
Fc Vibration IEC/EN 60068-2-6 Acceleration amplitude: 0.35 mm (10 to 60 Hz) Converter
(sinusoidal) 5 gn = 49 m/s2 (60 to 2000 Hz) operating
Frequency (1 Oc t/min): 10 to 2000 Hz
Test duration: 7.5 h (2.5 h each axis)
Fn Vibration IEC/EN 60068-2-64 Acceleration spectral density: 0.05 gn2/Hz Converter
broad-band Frequency band: 20 to 500 Hz operating
random Acceleration magnitude: 4.9 gn rms
(digital control) Test duration: 3 h (1 h each axis)
Kb Salt mist, cyclic IEC/EN 60068-2-52 Concentration: 5% (30°C) Converter
(sodium chloride Duration: 2 h per cycle not
NaCl solution) Storage: 40°C, 93% rel. humidity operating
Storage duration: 22 h per cycle
Number of cycles: 3
1Covers also EN 50155/EN 61373 (Category 1, body mounted, Class B)
®
BCD20009-G Rev AA Page 13 of 16 www.power-one.com
IMX35 Series Data Sheet
35-Watt Quad-Output DC-DC Converters
Mechanical Data
Dimensions in mm.
Fig. 16
Case IMX35 (Standard)
Weight: approx. 67 g
Fig. 17
Case IMX35 open frame (option Z)
Weight: approx. 43 g
Table 14: Temperature specifications, valid for air pressure of 800 to 1200 hPa (800 to 1200 mbar)
Temperature -8 Unit
Characteristics Conditions min max
TAAmbient temperature Operational 1 –40 2 85 1°C
TCCase temperature – 40 2 110
TSStorage temperature Non operational – 55 2 110
1See Thermal Considerations
2Start up at –55 °C
Temperatures
Reliability
Table 15: MTBF at nom. load
Model Ground benign Ground fixed Ground mobile Device hours1Unit
40 °C 40 °C 70 °C 50 °C
40IMX35 (MIL-HDBK-217F, TC) 336 000 141 000 86 000 110 000 396 000 h
110IMX35 (Bellcore, TA) 1445 000 529 000 294 000 144 000
1The device hours are based upon the IMX35 series field failure rate recorded between 2000 and 2005
European
Projection
5.08
47.8
63.5
72.8
6.4 8.9
0.8 x 0.8
09123a
T
c
T
c
Cores
T
c
Bottom
view
63.5
76.2
63.5
0.8 x 0.8
5.08
510.5
09121a
69.6
56.9
thread M3
T
c
Bottom
view
®
BCD20009-G Rev AA Page 14 of 16 www.power-one.com
IMX35 Series Data Sheet
35-Watt Quad-Output DC-DC Converters
Table 16: Pin allocation
Pin No. Quadruple
output
1 PUL
2Vi–
3 n.c.
4Vi+
5 Trim or Trim1
6W
7 Ref
8SD
11 Vo3–
12 Vo3+
13 Vo2+
14 Vo2–
15 Vo1–
16 Vo1+
17 Vo4+
18 Vo4–
19 n.c.
Safety and Inst allation Instructions
Pin allocation
Fig. 18
Footprint. The holes in the PCB should have a diameter of
1.5 mm.
Installation Instructions
Installation of the converters must strictly follow the national
safety regulations in compliance with the enclosure, mounting,
creepage, clearance, casualty, markings, and segregation
requirements of the end-use application.
Connection to the system shall be made via a printed circuit
board with hole diameters of 1.5 mm for the pins.
The converters should be connected to a secondary circuit.
Do not open the converter.
Ensure that a converter failure (e.g., by an internal short-
circuit) does not result in a hazardous condition.
Input Fuse
To prevent excessive current flowing through the input supply
line in case of a short-circuit in the converter, an external fuse
should be installed in the non-earthed input line. We
recommend a fast acting fuse specified in table 3.
Standards and Approvals
All converters are approved according to the standards UL
60950-1, CSA 60950-1, and IEC/EN 60950-1:2001.
The converters have been evaluated for:
• Building-in
• Basic insulation input to output, based on their maximum
input voltage
• Pollution degree 2 (not option Z)
• Connecting the input to a secondary circuit, which is
subject to a maximum transient rating of 1500 V.
The converters are subject to manufacturing surveillance in
accordance with the above mentioned standards.
CB scheme is available (DE3-52559M3).
Railway Applications
To comply with Railway standards, all components are coated
with a protective lacquer (except for option Z).
Protection Degree
The protection degree is IP 30 (not for option Z).
Cleaning Agents
In order to avoid possible damage, any penetration of cleaning
fluids should be prevented, since the power supplies are not
hermetically sealed.
However, the open-frame models (option Z) leave the factory
unlacquered and may be cleaned and lacquered by the
customer, for instance together with the motherboard. Contact
Power-One for the type of cleaning agents.
09122a
1
2
3
4
5
6
7
8
11
12
13
14
15
16
17
18
19
Bottom
view
®
BCD20009-G Rev AA Page 15 of 16 www.power-one.com
IMX35 Series Data Sheet
35-Watt Quad-Output DC-DC Converters
Table 18: List of options
Option Function of option Description
i Inhibit: Negative shutdown logic See Auxiliary Functions
Z Open frame See Mechanical Data
G1RoHS compliant for all 6 substances See Model Selection
1G is allways placed at the end of the part number.
NUCLEAR AND MEDICAL APPLICATIONS - Power-One products are not designed, intended for use in, or authorized for use as critical
components in life support systems, equipment used in hazardous environments, or nuclear control systems without the express written
consent of the respective divisional president of Power-One, Inc.
TECHNICAL REVISIONS - The appearance of products, including safety agency certifications pictured on labels, may change depending on
the date manufactured. Specifications are subject to change without notice.
Table 17: Electric strength test voltages
Characteristic Input to Input to Outputs to Between Unit
(outputs+case) (outputs+case) case outputs
20/40IMX35 170/110IMX35 1all models 1all models
Factory test >1 s 1.2 1.8 0.5 0.15 2kVAC
Equivalent DC voltage 1.5 2.5 0.7 0.2 2kVDC
Insulation resistance >100 >100 ––MΩ
at 500 VDC
1For open-frame models (option Z), only the insulation input to outputs is tested.
2The test voltage between outputs is not applied as routine test. For higher isolation between outputs, contact Power-One.
Isolation
The electric strength test is performed in the factory as a
routine test in accordance with EN 50116, EN 60950 and UL
60950 and should not be repeated in the field. Power-One will
not honor any warranty claims resulting from electric strength
field tests.
Options
®
BCD20009-G Rev AA Page 16 of 16 www.power-one.com
IMX35 Series Data Sheet
35-Watt Quad-Output DC-DC Converters
EC Declaration of Conformity
We
Power-One AG
Ackerstrasse 56, CH-8610 Uster
declare under our sole responsibility that IMX35 Series DC-DC converters carrying the CE-
mark are in conformity with the provisions of the Low Voltage Directive (LVD) 73/23/EEC of
the European Communities.
Conformity with the directives is presumed by conformity with the following harmonised
standards:
•EN 61204:1995 (= IEC 61204:1993, modified)
Low-voltage power supply devices, DC output - Performance characteristics
and safety requirements
•EN 60950-1:2001 (=IEC 60950-1:2001)
Safety of information technology equipment.
The installation instructions given in the corresponding data sheet describe correct installation
leading to the presumption of conformity of the end product with the LVD. All IMX35 Series
DC-DC converters are components, intended exclusively for inclusion within other equipment
by an industrial assembly operation or by professional installers. They must not be operated
as standalone products.
Hence conformity with the Electromagnetic Compatibility Directive 89/336/EEC (EMC Directive)
needs not to be declared. Nevertheless, guidance is provided in the data sheets on how
conformity of the end product with EMC standards under the responsibility of the installer can
be achieved, from which conformity with the EMC Directive can be presumed.
Uster, 14 Nov. 2005 Power-One AG
Rolf Baldauf Johann Milavec
Vice-President Engineering Director Projects and IP
