70IMX35D05D12-8G [BEL]
35 Watt Quad-Output DC-DC Converter;
| 型号： | 70IMX35D05D12-8G |
| 厂家： | 
BEL FUSE INC. |
| 描述： | 35 Watt Quad-Output DC-DC Converter |
| 文件： | 总16页 (文件大小：2004K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
IMX35 Series
35 Watt Quad-Output DC-DC Converter
Features
• Extremely wide input voltage ranges up to 150 VDC
• 4 outputs up to 60 V
• RoHS lead-free-solder and lead-solder-exempted
products available
• 5 year warranty for RoHS lead-free-solder products
• 1500 to 1800 VAC i/o electric strength test
• Electrical isolation between outputs
• Programmable input undervoltage lockout
• Shutdown/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
• Low profile: 10.5 mm or 8.9 mm with open frame
• Basic insulation
10ꢀ5
0ꢀ41ꢁ
76ꢀ2
3ꢁ
• Flexible output possibilities between 5 V and 60 V
Safety-approved to the latest edition of
IEC/EN 62368-1 3rd edition and UL/CSA 60950-1 2nd edition
1
8ꢀꢂ
0ꢀ35ꢁ
1 70/110IMX35 models
47ꢀ8
1ꢀ88ꢁ
72ꢀ8
2ꢀ87ꢁ
Table of Contents
Electromagnetic Compatibility (EMC).................................12
Immunity to Environmental Conditions...............................13
Mechanical Data.................................................................14
Safety and Installation Instructions.....................................14
Description of Options........................................................16
Description............................................................................2
Model Selection....................................................................2
Functional Description..........................................................3
Electrical Input Data .............................................................4
Electrical Output Data...........................................................6
Auxiliary Functions .............................................................10
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BCD20009-G Rev F, 20-Nov-2020
IMX35 Series
35 Watt Quad-Output DC-DC Converter
Description
The IMX35 Series of board-mountable, 35 Watt DC-DC converters has been designed according to the latest 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 voltages are prevalent.
Covering a total input voltage range from 9 V up to 150 V with 4 different models, the converters are available with up to four
electrically isolated outputs from 5 V to 60 V, externally adjustable and with flexible load distribution. A shutdown 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 62368-1 3rd edition, and approved
by Nemko. The converters provide basic insulation.
The circuit is comprised of 2 planar magnetics devices, and all components are automatically assembled and securely soldered
onto a single PCB board 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 environments, 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 105 °C with airflow. For extremely
high vibration environments the case has holes for screw mounting.
Model Selection
Table 1: Model Selection
Output 1
Vo nom Io nom
[VDC] [mA] [VDC] [mA] [VDC] [mA] [VDC] [mA]
Output 2
Output 3
Output 4
Input voltage
Efficiency1
ηmin ηmax
Model
Options2
Vo nom Io nom
Vo nom Io nom
Vo nom Io nom
Vi min to Vi max
[VDC]
[%]
[%]
5
5
5
5
1.35
1.4
1.4
1.4
5
5
5
5
1.35
1.4
1.4
1.4
5
5
5
5
1.35
1.4
1.4
1.4
5
5
5
5
1.35
1.4
1.4
1.4
9 to 36
18 to75
40 to 121
60 to 1502
82.5 84.5
20IMX35D05D05-8G
40IMX35D05D05-8G
70IMX35D05D05-8G
110IMX35D05D05-8G
82
83
82
84
85
84
12
12
12
12
0.65
0.7
0.7
0.7
12
12
12
12
0.65
0.7
0.7
0.7
12
12
12
12
0.65
0.7
0.7
0.7
12
12
12
12
0.65
0.7
0.7
0.7
9 to 36
18 to75
40 to 121
60 to 1502
83.5 85.5
83.5 85.5
84.5 86.5
20IMX35D12D12-8G
40IMX35D12D12-8G
70IMX35D12D12-8G
110IMX35D12D12-8G
84
86
15
15
15
15
0.55
0.6
0.6
0.6
15
15
15
15
0.55
0.6
0.6
0.6
15
15
15
15
0.55
0.6
0.6
0.6
15
15
15
15
0.55
0.6
0.6
0.6
9 to 36
18 to75
40 to 121
60 to 1502
84
86
20IMX35D15D15-8G
40IMX35D15D15-8G
70IMX35D15D15-8G
110IMX35D15D15-8G
i,
Z,
non-G
83.5 85.5
84
83
86
85
5
5
5
5
1.35
1.4
1.4
1.4
12
12
12
12
0.65
0.7
0.7
0.7
12
12
12
12
0.65
0.7
0.7
0.7
5
5
5
5
1.35
1.4
1.4
1.4
9 to 36
18 to75
40 to 121
60 to 1502
84
84
84
86
86
86
20IMX35D05D12-8G
40IMX35D05D12-8G
70IMX35D05D12-8G
83.5 85.5 110IMX35D05D12-8G
5
5
5
5
1.35
1.4
1.4
1.4
15
15
15
15
0.55
0.6
0.6
0.6
15
15
15
15
0.55
0.6
0.6
0.6
5
5
5
5
1.35
1.4
1.4
1.4
9 to 36
18 to75
40 to 121
60 to 1502
83.5 85.5
83.5 85.5
20IMX35D05D15-8G
40IMX35D05D15-8G
70IMX35D05D15-8G
110IMX35D05D15-8G
84
84
86
86
1
2
Efficiency at TA = 25 °C, Vo nom, Io nom
154 V for 2 s.
Product Marking
Converters without option Z are marked with type designation, input and output voltages and currents, applicable safety approval
and recognition marks, company logo, production date, and serial no.
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Page 2 of 16
IMX35 Series
35 Watt Quad-Output DC-DC Converter
Part Number Description
40 IMX35 -D05 D05 -8 i Z G
Input voltage range Vi
9 to 36 VDC............................................ 20
18 to 75 VDC............................................ 40
40 to 121 VDC............................................ 70
60 to 150 VDC...........................................110
Series .......................................................................IMX35
Outputs 1 and 4 (1st power train).................D05, D12, D15
Outputs 2 and 3 (2nd power train) ................D05, D12, D15
Operating ambient temperature range
TA = –40 to 85 °C .....................................-8
Options:
Inhibit.............................................................-i
Open frame.................................................. Z
RoHS compliant for all six substances....... G
Note: The sequence of options must follow the order above !
NFND: Not for new designs.
Preferred for new designs.
Functional Description
The IMX35 converters are comprised of 2 feedback-controlled interleaved-switching flyback powertrains using current mode control.
Each converter consists of 4 electrically isolated outputs deriving from the 2 power trains. Vo1, Vo4 derive from the first powertrain
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 powertrain.
Each pair of outputs has the same output voltage (i.e. D05, D12, etc.). If both powertrains have the same nominal output 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 on the primary side for each powertrain 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 to less than typically 70% of Vo nom, the
entire converter shuts down and automatically restart in short intervals (hiccup mode).
The incorporated overtemperature protection shuts down the hole converter in the case of overtemperature and resumes automatically
after cooling down.
030ꢀ8b
Vi+
4
16
15
Vo1+
Vo1–
1
5
6
7
8
2
3
PUL
Trim/Trim1
17 Vo4+
18 Vo4–
13 Vo2+
W
PWM
Ref
SD
Vi–
nꢁcꢁ
14
12
Vo2–
Vo3+
11 Vo3–
1ꢀ nꢁcꢁ
Fig. 1
Block diagram of quad-output models
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IMX35 Series
35 Watt Quad-Output DC-DC Converter
Electrical Input Data
General conditions:
TA = 25 °C, unless specified
Pins 8 (shutdown or i), 6 (W), 5 (Trim or Trim1), and 1 (PUL) left open-circuit (not connected), unless specified.
Table 2: Input Data
Model
20IMX35
40IMX35
Unit
Characteristics
Conditions
min
typ
max
min
typ
max
Vi
Input voltage range1
TA min to TA max,
92
36
182
75
Vi nom Nominal input voltage
20
40
V
Io = 0 to Io nom
Vi sur
Repetitive surge voltage
Abs. max input (3 s)
40
0.5
0.1
100
0.5
0.1
Switch on
SD high
0.25
0.25
Converter
Worst case condition at Vi min,
and full load
tstart-up
s
start-up time2
Vi nom, resistive load
Io nom, capacitive load
Io = 0, Vi min to Vi max
Io = 0 to Io nom
3
6
3
6
trise
Rise time3
ms
12
70
30
8
12
50
30
9
Ii o
No-load input current
Reflected ripple current
Inrush peak current4
Input capacitance
mA
mApp
A
Ii rr
Ii inr p
Ci
Vi = Vi nom
For surge calculation
Converter disabled
Converter operating
2
1.3
µF
-10 to +0.7
-10 to +0.7
VSD
Shutdown voltage
V
open circuit or 2 to 20
open circuit or 2 to 20
RSD
ISD
fs
Shutdown input resistance
Input current during shutdown
Switching frequency
approx. 10
approx. 10
kΩ
mA
kHz
Vi min to Vi max
12
6
Vi min to Vi max, Io = 0 to Io nom
220
240
220
240
Model
70IMX35
110IMX35
Unit
Characteristics
Vi
Input voltage range1
Vi nom Nominal input voltage
Conditions
min
typ
max
min
typ
max
TA min to TA max,
402
121
602
1505
70
110
V
Io = 0 to Io nom
Vi sur
Repetitive surge voltage
Abs. max input (3 s)
150
0.5
0.1
170
0.7
0.1
Switch on
SD high
0.25
0.4
Converter
Worst case condition at Vi min,
and full load
tstart-up
s
start-up time2
Vi nom, resistive load
Io nom, capacitive load
Io = 0, Vi min to Vi max
Io = 0 to Io nom
3
6
3
6
trise
Rise time3
ms
12
30
30
7
12
20
30
7
Ii o
No-load input current
Reflected ripple current
Inrush peak current4
Input capacitance
mA
mApp
A
Ii rr
Ii inr p
Ci
Vi = Vi nom
For surge calculation
Converter disabled
Converter operating
0.5
0.5
µF
-10 to +0.7
-10 to +0.7
VSD
Shutdown voltage
V
open circuit or 2 to 20
open circuit or 2 to 20
RSD
ISD
fs
Shutdown input resistance
Input current during shutdown
Switching frequency
approx. 10
approx. 10
kΩ
mA
kHz
Vi min to Vi max
5
5
Vi min to Vi max, Io = 0 to Io nom
220
240
2256
1
Vi 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.
Input undervoltage lockout at typ. 85% of Vi min
Measured with resistive and max. admissible capacitive load.
Source impedance according to ETS 300132-2, version 4.3.
154 V during 2 s
2
3
4
5
6
.
Revision BA or later. Older converters had fs ≤ 240 kHz.
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IMX35 Series
35 Watt Quad-Output DC-DC Converter
Inrush Current
The inrush current has been made as low as possible by choosing a very small input capacitance. Aseries resistor may be installed
in the input line to further reduce this current.
A
Vo
04022b
4
trise
04008b
Vo nom
3
2
1
t
t
tstartup
100 µs
0
20
60
80
40
Fig. 2
Fig. 3
Converter start-up and rise time (see table 2)
Typical inrush current at Vi nom, Po nom versus time (40IMX35).
Source impedance according to ETS 300132-2 at Vi nom
.
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
Model
Fuse type
20IMX35
40IMX35
70IMX35
110IMX35
F 8.0 A
F 4.0 A
F 2.0 A
F 1.5 A
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 voltage Peak power at 1 ms Peak pulse current
VBR nom [V]
PP [Ω]
1500
1500
600
IPP [A]
20IMX35
40IMX35
70IMX35
110IMX35
39
22
100
9.7
151
2.9
176
600
2.5
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
Vi+
Vi–
L
+
+
Model
Inductor (L)
Capacitor (C1, C2)
Cꢀ, Cꢁ: 220 μF / 50 V
Cꢀ, Cꢁ: 100 μF / 100 V
Diode (D)
C1
C2
D
IMX35
20IMX35 1.45 mH / 5 A
1.5 k E47A
40IMX35
70IMX35
4 mH / 3 A
---
---
4 mH / 1.5 A
Cꢀ: 120 μF / 160 V
Cꢁ: 240 μF / 160 V
Fig. 4
110IMX35 4.5 mH / 1.5 A
Cꢀ: 120 μF / 200 V
Cꢁ: 240 μF / 200 V
---
Example for external circuitry to comply with IEC/EN 61000-4-5;
the diode D is only necessary for 20IMX35 models.
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Page 5 of 16
IMX35 Series
35 Watt Quad-Output DC-DC Converter
Electrical Output Data
We recommend connecting an external 1 µF ceramic capacitor across the output pins.
General conditions:
– TA = 25 °C, unless TC is specified
– Pins 8 (shutdown or i), 6 (W), 5 (Trim or Trim1), and 1 (PUL) left open-circuit (not connected), unless specified.
Table 6: Output data per double-output powertrain (Vo1/Vo4 or Vo2/Vo3; each power train has 2 outputs)
Output
2 x 5 V
2 x 12 V
2 x 15 V
min typ max
Unit
Characteristics
Conditions
min typ max
min typ max
Vo1
Vo2
4.95
4.94
5.05 11.88
5.06 11.86
12.12 14.85
12.14 14.82
15.15
15.18
Output voltage
Vi nom, Io = 0.5 Io nom
V
20IMX
40IMX
70IMX
110IMX
20IMX
40IMX
70IMX
110IMX
2 x 1.35
2 x 1.40
2 x 1.40
2 x 1.40
3.5
2 x 0.65
2 x 0.70
2 x 0.70
2 x 0.70
1.8
2 x 0.55
2 x 0.60
2 x 0.60
2 x 0.60
1.5
Io nom Output current
Vi min to Vi max
A
3.8
2.0
1.7
Vi nom, TC = 25 °C,
Vo = 93% Vo nom
Io L
Current limit1
3.8
2.0
1.7
3.8
2.0
1.7
∆Vo
Line regulation
Vi min to Vi max, Io nom
Vi nom, Io = (0.1 to 1) Io nom
Vi min to Vi max
±1
±3
80
40
115
±1
±3
±1
±3
%
∆Vo l Load regulation
2
3
120
60
150
70
Vo1/2 Output voltage noise 5
mVpp
Io = Io nom
Vo L
Output overvoltage limit 4
Min. load 1%
115
115
%
produced after 2011
produced until 2011
0
0
6000
4000
0
0
680
470
0
0
470
330
Admissible capacitive load
per power train 6
Co ext
µF
Vo d
td
Voltage deviation
Recovery time
±250
0.75
±480
0.75
±520
mV
ms
Dynamic load
regulation
Vi nom, Io nom ↔ 1/2 Io nom
0.75
αVo
Temperature coefficient ∆Vo / ∆TC
Vi min to Vi max,Io = (0.1 to 1) Io nom
±0.02
±0.02
±0.02 %/K
1
Both outputs of each powertrain connected in parallel. The current limit is primary side controlled. In the case of an overload condition, the
thermal protection may cause the converter to shut down (automatic restart on cool-down).
BW = 20 MHz, measured with an external capacitor of 1 µF across the output pins.
Measured with a probe according to EN 61204
The output overvoltage protection is located on the primary side. It is not tracking the Trim/Trim1 control.
Both outputs of each powertrain connected in parallel.
2
3
4
5
6
Sum of capacities on the outputs of each powertrain.
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IMX35 Series
35 Watt Quad-Output DC-DC Converter
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 (TC Z with option Z)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 (or TC Z) measured at the measuring point of case temperature (see Mechanical Data) may under no
circumstances exceed the specified maximum value. The installer must ensure that under all operating conditions TC (or TC Z) 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.
Po/Po max
11047-X35a
1ꢀ0
0ꢀ8
0ꢀ5 m/s
= 100 LFM
0ꢀ6
natural cooling
0ꢀ4
0ꢀ2
0
TA
20
40
60
80
100
°C
Fig. 5
Maximum allowed output power versus ambient temperature (models with and without option Z)
Overtemperature Protection
The converter is protected against possible overheating by means of an internal temperature monitoring circuit located on the
primary side. It shuts down the converter above the internal temperature limit and attempts to restart automatically. This feature
prevents excessive internal temperature building up which could occur under overload conditions.
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).
Vo [%]
overload short-circuit condition
100
switch-off
05041b
70
t
0
0ꢀ3 s
Fig. 6
Overload switch off (hiccup mode), typical values.
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IMX35 Series
35 Watt Quad-Output DC-DC Converter
Series and Parallel Connection
The outputs of one or several double-output powertrains may be connected in series respecting the current limitation.
Both outputs of the same powertrain can always be connected in parallel in will behave like a single output.
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 of the same converter are being parallel and series-connected, it is recommended that outputs from the same powertrains
are parallel-connected first. This applies for instance, if 24 V shall be generated by a converter with four 12 V outputs; see fig. 7.
ꢂM138a
IMX35D12D12
Vo1+
Vi+
4
16
1
5
6
7
8
2
PUL
Trim
W
Vo1–
Vo4+
15
17
PWM
Ref
Vo4–
–24V
+24V
18
13
SD
Vi–
Vo2+
nꢀcꢀ
3
Vo2–
Vo3+
14
12
Vo3–
nꢀcꢀ
11
1ꢁ
Fig. 7
Generating 24 V with an IMX35D12D12-8
Note: Parallel operation of several converters may cause start-up problems. This becomes noticeable in applications, where one converter is
not able to deliver the full resistive and capacitive load current alone, as it is required in true redundant systems.
Typical Performance Curves
General conditions:
– TA = 25°C, unless TC is specified.
– Shut down and Trim pin left open-circuit.
Vo [V]
Vo4 [V]
05020-X35
13
05164b
13ꢀ5
12
13
11
Io4 = 0ꢀ035 A
12ꢀ5
10
12
ꢀ
8
Io4 = 0ꢀ35 A
11ꢀ5
Io1
Io total
0
0ꢁ5
1
1ꢁ5
2
A
0ꢀ06
0ꢀ2
0ꢀ3
0ꢀ5
0ꢀ6
0ꢀ7 A
0ꢀ1
0ꢀ4
Fig. 8
Fig. 9
Vo versus Io (typ.) of a double-output power train, with both
outputs in parallel (e.g., Vo1/4 of a 40IMX35D12D12)
Cross load regulation (typ.) on powertrain 1. Vo4 versus Io1
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IMX35 Series
35 Watt Quad-Output DC-DC Converter
Vo1, Vo4 [V]
0503ꢀb
14
13
Vo4
12
Vo1
11
10
Io1/Io1 nom
0ꢁ5
0ꢁ75
1
1ꢁ25
1ꢁ5
0
0ꢁ25
Fig. 10
Flexible load distribution (typ.) on power train 1 of a
40IMX35D12D12-8:
Vo1 versus Io1, Io4 = 0.5 Io4 nom
η [%]
ꢀ0
η [%]
05152a
05153a
ꢀ0
Vi min
Vi min
Vi nom
80
70
60
80
Vi nom
70
Po
100 % Po total
Po
100 % Po total
60
25
50
75
25
50
75
Fig. 11
Fig. 12
Efficiency versus input voltage and load. Typical values
Efficiency versus input voltage and load. Typical values
(20IMX35D12D12-8)
(40IMX35D12D12-8)
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IMX35 Series
35 Watt Quad-Output DC-DC Converter
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. 13 shows the schematic
diagram for the adjustment of quad-output models.
All models with equal output voltages have aTrim input at pin 5 referenced to the primary side, influencing all outputs simultaneously.
Models with different output voltages exhibit a Trim1 input, influencing only the first power train (Vo1 and Vo4).
Adjustment by means of an external resistor Rext
:
06137c
Vi+
Vo1+
Vo1–
Vo2+
16
4
5
Trim
15
13
+
–
Control
circuit
ref = 2ꢀ5 V
Vext
Rext
Vi–
V
Vo2–
2
14
Fig. 13
Output voltage control by means of the Trim input
Table 7: Rext for Vo > Vo nom
approximate values (Vi nom, Io = 0.5 Io nom
;
Table 8: Vo versus Vext for Vo = 85 to 105% Vo nom
typical values (Vi nom, Io = 0.5 Io nom
;
)
)
Vo [%Vo nom
]
Rext [kΩ]
Vo [%Vo nom
]
Vext [V]
Trim
Trim 1
Trim [V]
Trim 1 [V]
105 to 108 (107 typically)
0
0
17
110
∞
> 105
102
100
95
90
85
0
0
1.5
2.5
4.25
6.2
8
105
102
100
10
62
∞
1.8
2.5
4.3
6.2
8
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 Trim (pin 5) and Vi– (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 20V 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.
Synchronization (W)
It is possible to synchronize the switching frequency of one or more converters to an external clock signal.
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 of 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.
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Page 10 of 16
IMX35 Series
35 Watt Quad-Output DC-DC Converter
Shutdown
The outputs of the converters may be enabled or disabled by means of a logic signal (TTL, CMOS, etc.) applied to shutdown (pin 8).
If the shutdown function is not required, pin 8 should be left open-circuit:
Converter operating:
Converter disabled:
2.0 to 20 V
–10 to +0.7 V
Progr. Input Undervoltage Lockout PUL
A special feature of the converter (with Rev. BA or later) is the adjustable undervoltage lockout protection, which protects the
converter (and the system) from high current caused by operation at low input voltages. This ensures easier start-up in distributed
power systems.
The table below shows the band of switch on/off and the hysteresis.
Table 9: Trigger level and hysteresis (pin 1 left open)
Model
20IMX35
40IMX35
70IMX35
110IMX35
Trigger level
7 to 8
Hysteresis
Unit
<0.5
<1
14 to 15.5
31 to 34
V
<3
42 to 50
< 8
The undervoltage lockout levels may be programmed by using an external resistor RPUL between PUL and Vi– to increase the
preset levels as specified in table 10.
Table 10: Typical values for RPUL and the respective lockout voltage for input voltage.
20IMX35
RPUL [kΩ]
40IMX35
RPUL [kΩ]
70IMX35
RPUL [kΩ]
110IMX35
RPUL [kΩ]
Vi min [V]
≤8
Vi min [V]
≤15.5
22
Vi min [V]
31
Vi min [V]
42
∞
39
19
13
9.1
∞
43
16
10
0
∞
∞
10
270
110
80
40
270
120
51
50
12
26
50
60
14
28
55
75
16
32
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Page 11 of 16
IMX35 Series
35 Watt Quad-Output DC-DC Converter
Electromagnetic Compatibility (EMC)
A suppressor diode together with an input filter form an effective protection against high input transient voltages which typically
occur in many installations, but especially in battery-driven mobile applications.
Electromagnetic Immunity
Table 11: Immunity type tests
Phenomenon
Basic
Standard
Level Coupling mode 1 Value
applied
Waveform
Source Test procedure
imped.
In
Perf.
oper. crit.2
Electrostatic
discharge to case 61000-4-2
(not with option Z)
IEC/EN
contact discharge
(Trim pin open)
330 Ω 10 pos. & 10 neg.
150 pF discharges
2 3
x 4
6000 Vp
1/50 ns
yes
yes
B
A
Electromagnetic
IEC/EN
antenna
20 V/m
AM 80% / 1 kHz
N/A
80 – 800 MHz
field
61000-4-3
20 V/m
10 V/m
5 V/m
3V/m
800 – 1000 MHz
1400 – 2100 MHz
2100 – 2500 MHz
5100 – 6000 MHz
5
antenna
AM 80% / 1 kHz
N/A
yes
yes
A
A
Electrical fast
transients / burst 61000-4-4
IEC/EN
burstsof 5/50ns;
5 kHz over 15 ms
burst period 300 ms
60 s positive
60 s negative
transients
3 6
direct +i/–i
±2000 Vp
50 Ω
42 Ω
Surges
IEC/EN
61000-4-5
5 pos. & 5 neg.
3 7
3 8
+i/–i
+i/–i
±1000 Vp
10 VAC
1.2 / 50 µs
yes
yes
A
A
0.5 μF surges
0.15 – 80 MHz
150 Ω
RF Conducted
immunity
IEC/EN
61000-4-6
AM modulated
(140 dBμV) 80% / 1 kHz
50 Ω
1
i = input, o = output, c = case (not with option Z)
2
3
4
5
6
7
8
A = normal operation, no deviation from specification, B = temporary deviation from specs. possible.
Corresponds to EN 50121-3-2:2016 table 5.3
Corresponds to EN 50121-3-2:2016 table 5.1
Corresponds to EN 50121-3-2:2016 table 5.2
Corresponds to EN 50121-3-2:2016 table 3.2
Corresponds to EN 50121-3-2:2016 table 3.3, external components required; see fig. 15
Corresponds to EN 50121-3-2:2016 table 3.1
Electromagnetic Emissions
Fig. 14
Typ disturbances (quasi-peak and average) at the input according to EN 50121-4,
measured at Vi nom and Io nom (110IMX35D05D15-8).
Conducted Emissions
Compliance with EN 55011 group 1, class A, and EN 50121-4 was tested with the filter Fig. 4 (values Table 5) see page 5. The
resuts are shown in Fig. 14 above.
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Page 12 of 16
IMX35 Series
35 Watt Quad-Output DC-DC Converter
Immunity to Environmental Conditions
Table 12: Mechanical and climatic stress
Test method
Standard
Test Conditions
Temperature:
Relative humidity:
Duration:
Status
Cab Damp heat
steady state
IEC/EN 60068-2-78
MIL-STD-810D section 507.2
40±2 °C
Converter
not operating
93+2/-3
56 days
35±2 °C
48 h
%
Ka
Fc
Salt mist test
(sodium chloride
NaCl solution)2
EN 50155:2007
clause 12.2.10
class ST32
Temperature:
Duration:
Converter
not operating
Vibration
IEC/EN 60068-2-6
MIL-STD-810D section 514.3
Acceleration amplitude:
0.35 mm (10 – 60 Hz)
5 gn = 49 m/s2 (60 - 2000 Hz)
(sinusoidal)
Converter
operating
Frequency (1 Oct/min):
Test duration:
10 – 2000 Hz
7.5 h (2.5 h in each axis)
Fh
Random vibration
road-band (digital
control) & guidance
IIEC/EN 60068-2-64
Acceleration spectral density: 0.05 gn2/Hz
Frequency band:
8 to 500 Hz
Converter
operating
Acceleration magnitude:
Test duration:
4.9 gn
rms
1.5 h (0.5 h in each axis)
50 gn = 490 m/s2
11 ms
Ea
Shock
(half-sinusoidal)
IEC/EN 60068-2-27
MIL-STD-810D section 516.3
Acceleration amplitude:
Bump duration:
Converter
operating
Number of bumps:
Acceleration amplitude:
Bump duration:
18 (3 in each direction)
5.1 gn
-
-
Shock
EN 50155:2007 clause 12.2.11
EN 61373 sect. 10, class B,
body mounted1
30 ms
Converter
operating
Number of bumps:
18 (3 in each direction)
Simulated long life
testing at increased
random vibration
levels
EN 50155:2007 clause 12.2.11
EN 61373 sect. 8 and 9,
body mounted1
Acceleration spectral density: 0.02 gn2/Hz
Frequency band:
Acceleration magnitude:
Test duration:
5 to 150 Hz
Converter
operating
0.8 gn
rms
15 h (5 h in each axis)
1
2
Body mounted = chassis of a railway coach
Models without option Z
Temperatures
Table 13: Temperature specifications, valid for air pressure of 800 to 1200 hPa (800 to 1200 mbar)
Model
-8
Unit
Characteristics
Conditions
min
- 403
- 403
- 403
- 55
typ
max
851
TA
TC
Ambient temperature
Case temperature (without opt. Z)2
Operational1
1052
1052
85
° C
TC Z Components temperature with opt. Z2
TS
Storage temperature
Non operational
1
2
3
See Thermal Considerations
Temperature measurement point; see Mechanical Data
Start-up at –55 °C
Reliability
Table 14: MTBF at nom. load
Ratings
Ground benign
40 °C
Ground fixed
Ground mobile
50 °C
Device hours1
Unit
Model
Standard
40 °C
70 °C
40IMX35 MIL-HDBK-217F, TC
110IMX35 Bellcore, TA
336 000
141 000
529 000
86 000
110 000
396 000
h
1 445 000
294 000
144 000
1
The device hours are based upon the IMX35 series field failure rate recorded between 2000 and 2005
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Page 13 of 16
IMX35 Series
35 Watt Quad-Output DC-DC Converter
Mechanical Data
Dimensions in mm (inches). Tolerances ±0.3 mm, unless otherwise noted.
4 threads M3
European
Projection
0ꢁ121d
0ꢀ8 x 0ꢀ8
thread M3
0ꢁ123c
TC Z
0ꢀ8 x 0ꢀ8
Bottom
view
Bottom
view
TC Z
63ꢀ5
6ꢁꢀ6
76ꢀ2
63ꢀ5
72ꢀ8
TC
TC Z
Cores
Fig. 15
Case IMX35 (Standard)
Material: Zinc; weight: approx. 67 g
Fig. 16
Case IMX35 open frame (option Z)
Weight: approx. 43 g
Safety and Installation Instruction
Pin Allocation
Table 15: Pin allocation
0ꢀ122b
11
12
13
14
15
16
17
18
1ꢀ
Pin No.
Quadruple
output
Pin No. Quadruple
output
1
2
3
1
2
3
4
5
6
7
8
PUL
11
12
13
14
15
16
17
18
19
Vo3-
Vo3+
Vo2+
Vo2-
Vo1-
Vo1+
Vo4+
Vo4-
n.c.
Bottom
view
4
Vi-
n.c.
5
6
7
8
Vi+
Trim or Trim 1
W
4 threads M3
Ref
Fig. 17
SD or i
Footprint. The holes in the PCB should have a diameter of
1.6 mm.
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IMX35 Series
35 Watt Quad-Output DC-DC Converter
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 safety-approved to IEC/EN 62368-1 3rd edition and UL/CSA 60950-1 2nd edition.
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 1500V.
The converters are subject to manufacturing surveillance in accordance with the above mentioned standards.
CB scheme is available.
Railway Applications
To comply with Railway standards, all components are coated with a protective lacquer (except for option Z).
Protection Degree and Cleaning Liquids
The protection degree is IP 30 (not for option Z). In order to avoid damage, any penetration of cleaning fluids should be prevented,
since the converters are not hermetically sealed.
However, open-frame models (option Z) leave the factory unlacquered; they may be lacquered by the customer, for instance
together with the mother board. Cleaning liquids are not permitted – except washing at room temperature with isopropyl alcohol
and de-inonized/destilled water (1 : 1).
Note: Cleaning liquids can damage the adhesive joints of the ferrite cores.
Isolation
The electric strength test is performed in the factory as a routine test in accordance with EN 62911 and EN 62368-1 3rd edition,
and should not be repeated in the field. The Company will not honor any warranty claims resulting from electric strength field tests.
Table 16: Electric strength test voltages
Characteristics
Input to
(outputs + case)
Input to
(outputs + case)
Outputs to case all
models3
Betveen outputs
all models
Unit
20/40IMX353
1.2 / 1.51
1.5 / 2.11
>100
70/110IMX353
Factory test >1 s
1.8
2.5
0.5
0.7
-
0.152
0.202
-
kVAC
kVDC
MΩ
Equivalent DC test voltage
Insulation resistance (500 VDC)
> 100
1
1.5 kVAC according to IEC 62368-1 3rd edition, sect. 6.2, Telecom equipment; type test with 1.5 kVAC / 60 s (IEE 802.3).
IMX35 units produced before 2013 were tested with 1.2 kVAC only.
2
3
The test voltage between outputs is not applied as routine test.
For open-frame models (option Z), only the insulation input to outputs is tested.
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IMX35 Series
35 Watt Quad-Output DC-DC Converter
Description of Options
i: Inhibit (Negative Shutdown Logic)
The outputs of the converter may be enabled or disabled by means of a logic signal (TTL, CMOS, etc.) applied to the inhibit pin 8.
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 at pin 8:
Converter operating:
Converter disabled:
–10 V to 0.8 V
2.4 V to 20 V or left open-circuit
06138a
4
Vi+
8
2
i
Vi–
Fig. 18
If the inhibit pin is not used, connect it to Vi–.
Z: Open Frame
For applications, where the protection by a housing is not necessary or in the case that the motherboard should be lacquered
after fitting the converter.
Note: The converters shall not be exposed to cleaning processes, as this will damage the glue of the ferrite cores.
G: RoHS-6
Converters with a type designation ending by G are RoHS-compliant for all six substances.
Non-G models are produced with leaded solder and are not RoHS-compliant. They are not preferred models.
NUCLEAR AND MEDICAL APPLICATIONS - These products are not designed or intended for use as critical components in life support systems,
equipment used in hazardous environments, or nuclear control systems.
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.
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