20IMX35-12-12-8 [BEL]
DC-DC Regulated Power Supply Module, 2 Output, 35W, Hybrid;
| 型号： | 20IMX35-12-12-8 |
| 厂家： | 
BEL FUSE INC. |
| 描述： | DC-DC Regulated Power Supply Module, 2 Output, 35W, Hybrid |
| 文件： | 总18页 (文件大小：179K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Board Mountable
DC-DC Converters
IMX 35 Series
35 Watt DC-DC Converters
IMX 35 Series
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
10.5
0.41"
63.5
2.5"
76.2
3"
• 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
Approvals pending
8.9
0.35"
47.8
1.88"
72.8
2.87"
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.
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.
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-
Table of Contents
Page
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
Summary .......................................................................... 1
Type Survey and Key Data .............................................. 2
Type Key .......................................................................... 3
Functional Description...................................................... 4
Electrical Input Data ......................................................... 6
Electrical Output Data ...................................................... 8
Edition 5/08.2001 R1
1/18
Board Mountable
DC-DC Converters
IMX 35 Series
Type Survey and Key Data
Table 1: Type survey
Output 1
Output 2
Output 3
Output 4
Input voltage Eff.
Type
Trim 1 Opt. 2
Uo nom Io nom Uo nom Io nom Uo nom Io nom Uo nom Io nom
Ui min...Ui max htyp
designation
[V DC]
[A]
[V DC]
[A]
[V DC]
[A]
[V DC]
[A]
[V DC]
[%]
5
5
2.7
2.8
5
5
2.7
2.8
-
-
-
-
-
-
-
-
9...36
18...75
84
84
20 IMX 35-05-05-8
40 IMX 35-05-05-8
primary
primary
12
12
1.3
1.4
12
12
1.3
1.4
-
-
-
-
-
-
-
-
9...36
18...75
87
87
20 IMX 35-12-12-8
40 IMX 35-12-12-8
primary
primary
15
15
1.1
1.2
15
15
1.1
1.2
-
-
-
-
-
-
-
-
9...36
18...75
87
87
20 IMX 35-15-15-8
40 IMX 35-15-15-8
primary
primary
3.3
3.3
3.5
4.25
5
5
1.3
1.35
5
5
1.3
1.35
-
-
-
-
9...36
18...75
81
83
20 IMX 35-03D05-8 3 second. i, Y
40 IMX 35-03D05-8 3 second. i, Z
3.3
3.3
3.5
4.25
12
12
0.65
0.7
12
12
0.65
0.7
-
-
-
-
9...36
18...75
84
86
20 IMX 35-03D12-8 3 second. i, Y
40 IMX 35-03D12-8 3 second. i, Z
3.3
3.3
3.5
4.25
15
15
0.55
0.6
15
15
0.55
0.6
-
-
-
-
9...36
18...75
84
86
20 IMX 35-03D15-8 3 second. i, Y
40 IMX 35-03D15-8 3 second. i, Z
5.1
5.1
2.9
3.4
5
5
1.35
1.4
5
5
1.35
1.4
-
-
-
-
9...36
18...75
81
83
20 IMX 35-05D05-8 3 second. i, Y
40 IMX 35-05D05-8 3 second. i, Z
5.1
5.1
2.9
3.4
12
12
0.65
0.7
12
12
0.65
0.7
-
-
-
-
9...36
18...75
84
86
20 IMX 35-05D12-8 3 second. i, Y
40 IMX 35-05D12-8 3 second. i, Z
5.1
5.1
2.9
3.4
15
15
0.55
0.6
15
15
0.55
0.6
-
-
-
-
9...36
18...75
84
87
20 IMX 35-05D15-8 3 second. i, Y
40 IMX 35-05D15-8 3 second. i, Z
5
5
1.35
1.4
5
5
1.35
1.4
5
5
1.35
1.4
5
5
1.35
1.4
9...36
18...75
86
87
20 IMX 35 D05D05-8 primary
40 IMX 35 D05D05-8 primary
5
5
1.35
1.4
12
12
0.65
0.7
12
12
0.65
0.7
5
5
1.35
1.4
9...36
18...75
86
88
20 IMX 35 D05D12-8 primary
40 IMX 35 D05D12-8 primary
5
5
1.35
1.4
15
15
0.55
0.6
15
15
0.55
0.6
5
5
1.35
1.4
9...36
18...75
87
88
20 IMX 35 D05D15-8 primary
40 IMX 35 D05D15-8 primary
i, Z
12
12
0.65
0.7
12
12
0.65
0.7
12
12
0.65
0.7
12
12
0.65
0.7
9...36
18...75
87
89
20 IMX 35 D12D12-8 primary
40 IMX 35 D12D12-8 primary
15
15
0.55
0.6
15
15
0.55
0.6
15
15
0.55
0.6
15
15
0.55
0.6
9...36
18...75
88
89
20 IMX 35 D15D15-8 primary
40 IMX 35 D15D15-8 primary
1 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. V01 and V04. For the triple ver-
sions the Trim input (pin 18) is on the secondary side and influences the first output (V01) only.
2 For minimum quantity contact Power-One.
3 For lead times contact Power-One.
Edition 5/08.2001 R1
2/18
Board Mountable
DC-DC Converters
IMX 35 Series
Type Key
Double output units
20 IMX 35 - 12 - 12 -8
Input voltage range Ui
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 TA
–40...85°C .................................................. -8
Triple output units
40 IMX 35 - 05 D05 -8 i Z
Input voltage range Ui
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 TA
–40...85°C .................................................. -8
Options:
Inhibit ............................................................ i
Base plated open frame ..............................Y 1
Open frame .................................................. Z 2
Quad output units
40 IMX 35 D05 D05 -8 i Z
Input voltage range Ui
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 TA
–40...85°C .................................................. -8
Options:
Inhibit ............................................................ i
Open frame .................................................. Z 2
1 20 IMX 35 triple output types.
2 All models except 20 IMX 35-triple output types.
Edition 5/08.2001 R1
3/18
Board Mountable
DC-DC Converters
IMX 35 Series
Functional Description
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 Uo nom is pos-
sible by use of the Trim input on the primary side (See:
Block diagram, dual 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.)
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 (Uo1) 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 Uo nom. (See: Block diagram,
triple 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 Uo 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
17
Vo1+
1
5
6
7
8
2
3
PUL
15
16
18
12
Vo1–
Trim
W
1
PWM
Ref
SD
1
1
Vi–
n.c.
13 Vo2+
14
11
n.c.
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
DC-DC Converters
IMX 35 Series
03097
4
17
Vi+
Vo1+
n.c.
1
5
6
7
1
2
3
PUL
n.c.
W
16
15
Control
Vo1–
PWM
Ref
18
13
Trim1
Vo2+
SD
Vi–
n.c.
14
12
Vo2–
Vo3+
11
19
Vo3–
n.c.
Fig. 2
Block diagram 2, triple output types
03098
Vi+
4
16
Vo1+
1
5
6
7
8
2
3
PUL
15
Vo1–
Trim/Trim1/4
17 Vo4+
18 Vo4–
13 Vo2+
PWM
W
Ref
SD
Vi–
n.c.
14
12
Vo2–
Vo3+
11 Vo3–
19 n.c.
Fig. 3
Block diagram 3, quad output types
Edition 5/08.2001 R1
5/18
Board Mountable
DC-DC Converters
IMX 35 Series
Electrical Input Data
General conditions:
– TA = 25°C, unless TC is specified.
– Shut down pin left open circuit (not connected).
– Trim not connected.
Table 2: Input Data
Input
20 IMX
40 IMX
Characteristics
Conditions
min
9 2
typ
max
36
min
18 2
typ
max
75
Unit
Ui
Input voltage range 1
TA min...TA max
Io = 0...Io nom
V DC
Ui nom
Ui sur
tstart up
Nominal input voltage
20
40
Repetitive surge voltage
Abs. max input (3 s)
40
0.5
0.1
100
0.5
0.1
Converter
start-up time 2
Switch on
SD high
Worst case condition at
Ui min and full load
0.25
0.25
s
trise
Rise time 3
Ui nom resist load
Io nom capac. load
Io = 0, Ui min...Ui max
Io = 0...Io nom
5
5
ms
mA
10
20
70
30
8
10
20
50
30
9
Ii o
No load input current
Reflected ripple current
Inrush peak current 4
Input capacitance
Iirr
Iinr p
Ci
Ui = Ui nom
A
for surge calculation
Unit shut down
Unit operating
2
1.3
µF
USD
Shut down voltage
–10...0.7
–10...0.7
V DC
open-circuit or 2...20
open-circuit or 2...20
RSD
ISD
Shut down input resistance For current calculations
approx. 10
12
approx. 10
6
kΩ
Input current if unit
shut down
Ui min...Ui max
mA
fs
Switching frequency
Ui min...Ui max, Io = 0...Io nom
EN 55022 5
approx. 220
B 6
approx. 220
B 6
kHz
ui RFI
Input RFI level, conducted
1 Ui min will not be as stated if Uo is increased above Uo nom by use of Trim input. If the output voltage is set to a higher value,
Ui min will be proportionately increased.
2 Input undervoltage lock-out at typ. 90% of Ui min
.
3 Measured with resistive and max. admissible capacitive load.
4 Source impedance according to prETS 300132-2, version 4.3.
5 Measured with a lead length of 0.1 m, leads twisted.
6 External capacitor required.
Edition 5/08.2001 R1
6/18
Board Mountable
DC-DC Converters
IMX 35 Series
Inrush current
Input Transient Voltage Protection
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.
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.
04022
Table 4: Built-in transient voltage suppressor
I [A]
Type
Breakdown
voltage
VBr nom [V]
Peak power
at 1 ms
Peak pulse
current
Ipp [A]
4
3
2
Pp [W]
20 IMX 35
40 IMX 35
50
1500
1500
22
100
9.7
1
t [µs]
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.
0
20
50 60 70 80 90 100
10
30 40
Fig. 4
Typical inrush current at Ui nom, Po nom versus time
(40 IMX 35). Source impedance according to
prETS 300132-2, version 4.3 at Ui nom
.
Note: The suppressor diode D is only necessary for
20 IMX 35 types.
Uo
trise
04008
Uo nom
Table 5: Components for external circuitry for IEC/EN
61000-4-5, level 2 or ETR 283 (19Pfl1) compliance.
Type
Inductor (L)
22 µH/5A
Capacitor (C)
470 µF/40 V
Diode (D)
1.5 k E47A
-
t
tstart up
20 IMX 35
40 IMX 35
68 µH/2.7 A
2 x 100 µF/100 V
Fig. 5
Converter start-up and rise time
04036
L
Reverse Polarity Protection
Vi+
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.
+
C
D
Vi–
Table 3: Recommended external fuses
Fig. 6
Example for external circuitry to comply with IEC/EN
61000-4-5 or ETR 283 (19Pfl1); the suppressor diode D is
only necessary for 20 IMX 35 types.
Converter type
20 IMX 35
Fuse type
F8.0A
40 IMX 35
F4.0A
22
04052
11.5
Fig. 7
23.8
Dimensions of inductor L for 20 IMX 35 and 40 IMX 35
types (e.g. Coil Craft, PCH-45 series).
Edition 5/08.2001 R1
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Board Mountable
DC-DC Converters
IMX 35 Series
Electrical Output Data
General conditions:
– TA = 25°C, unless TC is specified
– Shutdown pin left open-circuit (not connected)
– Trim not connected
Table 6a: Output data for single (main) output.
Output
3.3 V
5.1 V
Characteristics
Conditions
min typ
3.28
max
3.32
min typ max
Unit
V DC
A
Uo
Output voltage
Ui nom, Io = 0.5 Io nom
20 IMX Ui min...Ui max
40 IMX
5.07
5.13
Io nom Output current
3.5
2.9
3.4
4.2
4.25
Io1L
Io2L
Current limit 1
20 IMX Ui nom, TC = 25°C
5.5
Uo1 = 93% Uo nom
Io1L
Io2L
40 IMX
6.1
4.6
DUo U Line/load regulation
Ui min...Ui max
Io = (0.05...1) • Io nom
,
±1
±1
%
2
uo1/2
Output voltage noise
Ui min...Ui max
Io = Io nom
70
40
80
40
mVpp
3
Uo L
Output overvoltage limit. 4
115
130
4000
±250
1
115
130
2700
±250
1
%
µF
Co ext Admissible capacitive load
uo d
td
Dynamic
load
Voltage deviat. Ui nom
o nom ↔ 1/
Io nom
mV
ms
I
2
Recovery time
regulation
IEC/EN 61204
aUo
Temperature coefficient
DUo/DTC
Ui min...Ui max
Io = 0.1...1 Io nom
±0.02
±0.02
%/K
Table 6b: Output data for double output power trains.
Output
2 × 5 V
2 × 12 V
min typ max
2 × 15 V
min typ max
Characteristics
Conditions
min typ max
Unit
Uo1
Uo2
Output voltage
Ui nom
Io = 0.5 Io nom
4.95
4.94
5.05
5.06
11.88
11.86
12.12
12.14
14.85
14.82
15.15 V DC
15.18
Io nom Output current
20 IMX Ui min...Ui max
40 IMX
2 × 1.35
2 × 1.4
3.5
2 × 0.65
2 × 0.55
2 × 0.60
A
2 × 0.70
1.8
IoL
Current limit 1
20 IMX Ui nom, TC = 25°C
1.5
1.6
Uo = 93% Uo nom
40 IMX
3.7
2.0
DUo U Line regulation
DUo l Load regulation
Ui min...Ui max, Io nom
±1
±3
±1
±3
±1
±3
%
Ui nom
Io = (0.1...1) Io nom
2
uo1/2
Output voltage noise
Ui min...Ui max
Io = Io nom
80
40
120
60
150
70
mVpp
3
Uo L
Output overvoltage limit. 4
Min. load 1%
115
130
4000
±250
1
115
130
470
±400
1
115
130
330
±450
1
%
µF
Co ext Admissible capacitive load
uo d
td
Dynamic
load
Voltage deviat. Ui nom
o nom ↔ 1/
Io nom
mV
ms
I
2
Recovery time
regulation
aUo
Temperature coefficient
DUo/DTC
Ui min...Ui max
Io = 0.1...1 Io nom
±0.02
±0.02
±0.02
%/K
1 The current limit is primary side controlled. In the event of a sustained overload condition the thermal protection may cause the unit to
shutdown (restart on cool-down).
2 BW = 20 MHz
3 Measured with a probe according to EN 61204
4 The overvoltage protection is via a primary side second regulation loop, not tracking with Trim control.
Edition 5/08.2001 R1
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Board Mountable
DC-DC Converters
IMX 35 Series
Thermal Considerations
Connection in Series
If a converter, mounted on a PCB, is located in free, quasi-
stationary air (convection cooling) at the indicated maxi-
mum 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 TC (see: Mechani-
cal 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 inte-
gration into a system. The thermal conditions are influ-
enced by input voltage, output current, airflow, temperature
of surrounding components and the surfaces and proper-
ties 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.
The outputs of one or several single or 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. 5V / 5V) can be put in parallel and will share
their output currents almost equally.
Parallel operation of double outputs of several converters
with the same output voltage may cause start-up problems
at initial start-up. This is only advisable in applications where
one converter is able to deliver the full load current as e.g.
required in true redundant systems.
The first outputs (5.1V or 3.3 V) of triple output units should
not be paralleled, except in true redundant systems using
decoupling diodes
Output Overvoltage Protection
Caution: The case temperature TC measured at the:
Measuring point of case temperature TC (see: Mechani-
cal Data) may under no circumstances exceed the
specified maximum value. The installer must ensure that
under all operating conditions TC remains within the lim-
its stated in the table: Temperature specifications.
The outputs of the converter are protected against overvolt-
ages by a second control loop. In the event of an overvolt-
age on one of the outputs the unit will shut down and
attempt to restart in short intervals. The main purpose of
this feature is to protect against possible overvoltages
which could occur due to a failure in the feedback control
circuit. The overvoltage protection is not designed to with-
stand externally applied overvoltages.
Temperature Range
Full output power from –40...71°C. Above 71°C the output
power derating below should be observed. The modules
will provide the specified output power with free air convec-
tion cooling.
Typical Performance Curves
General conditions:
– TA = 25°C, unless TC is specified.
– Shut down pin left open circuit.
– Trim input not connected.
Po/Po max
11047
1.2
1.0
0.8
0.6
Uo [V]
05019
5.5
5.0
4.5
4.0
3.5
3.0
0.4
0.2
0
–40
TA [°C]
–20
0
80
20
40
60
Fig. 8
Maximum allowed output power versus ambient tempera-
ture.
0
2
3
4
5
Io [A]
1
Fig. 9 a
Short Circuit Behaviour
Uo versus Io (typ) of units with Uo = 5.1 V.
(40 IMX 35-05D12-8).
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).
Overtemperature Protection
The converter is protected against possible overheating by
means of an internal temperature monitoring circuit. It shuts
down the unit above the internal temperature limit and at-
tempts to automatically restart. This feature prevents from
excessive internal temperature which could occur under
heavy overload conditions.
Edition 5/08.2001 R1
9/18
Board Mountable
DC-DC Converters
IMX 35 Series
Uo [V]
Uo1, Uo2 [V]
05020
05039
13
14
13
12
11
10
12
11
10
9
Uo4
Uo1
8
Io1
Io1 nom
[%]
50
75
100
125
150
0
25
7
Io total [A]
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8
0
Fig. 11
Fig. 9 b
Flexible load distribution on power train 1 of 40 IMX 35
D12D12-8 (4 ¥ 12 V) with load variation from 0...150% of
Po nom on output Vo1 with Vo4 loaded with 50% of Po4 nom
U
o1/2 versus Io1/2 of double output power trains
(i.e. 2 × 12 V). See: Block diagram 1
.
Uo4 [V]
13.5
h [%]
05164
05153
90
Ui min
13.0
Io4 = 0.035 A
12.5
80
Ui nom
12.0
Io4 = 0.35 A
70
11.5
11.0
0.06
0.20
0.30
0.50 0.60 0.70 Io1 [A]
0.10
0.40
Po
100 Po total
60
[%]
25
50
75
Fig. 10
Cross load regulation Uo4 versus Io1 (typ) for various Io4 for
Vo1, Vo4 on power train 1. See: Block diagram double
output types. (20 IMX 35 D12D12-8)
Fig. 13
Efficiency versus input voltage and load. Typical values
20 IMX 35 D12D12-8
05041
Uo [%]
h [%]
overload short circuit condition
05152
90
100
Ui min
Ui nom
switch-off
70
80
70
60
8
t [ms]
60
60
Fig. 14
Overload switch off (hiccup mode), approximate values.
Po
100 Po total
[%]
25
50
75
Fig. 12
Efficiency versus input voltage and load. Typical values
40 IMX 35 D12D12-8
Edition 5/08.2001 R1
10/18
Board Mountable
DC-DC Converters
IMX 35 Series
Auxiliary Functions
Adjustable Output Voltage
06137
As a standard feature, the IMX 35 offer adjustable output
voltages in the range 80...105% of Uo nom by use of a con-
trol pin. The Trim control is offered either on primary or sec-
ondary side of the converter depending on type.
Vi+
Vo1+
17
4
5
>7 kΩ
Vo1–
Trim
15
Trim 1/4
+
Vo2+
The double output units IMX 35-05-05, IMX 35-12-12 and
IMX 35-15-15 have a Trim input connected to pin 5. This in-
put influences both outputs simultaneously. Both power
trains have passive transformer feedback and the Trim in-
put (pin 5) is referenced to the primary side. Fig. 16 shows
the circuit topology. Adjustment of the output voltage is pos-
sible by means of either an external resistor Rext in the
range of 100...105% of Uo nom (table 10) or in the range of
80...105% of Uo nom by means of an external voltage source
(table 11).
Control
circuit
Uref = 2.5 V
13
Uext
Rext
–
Vo2–
Vi–
2
11
Fig. 16
Output voltage control for double and quad output units by
means of the Trim input on the primary side.
a) Adjustment by means of an external resistor Rext
:
The IMX 35 triple output units feature a first power train with
magnetic feedback. The simplified circuit is shown in
Fig. 15. The Trim1 (pin 18) is secondary referenced and in-
fluences only the first power train. Adjustment of the output
voltage is possible by means of an external resistor Rext
between the Trim1 and either Vo1+ or Vo1–. If the Trim1
Adjustment of the output voltage by means of an external
resistor Rext is possible within the range of 100...105% of
Uo nom. Rext should be connected between the Trim pin 5
and Vi–. Connection of Rext to Vi+ may damage the con-
verter. Table 10 indicates suitable resistor values for typi-
cal output voltages under nominal conditions (Ui nom, Io =
0.5 Io nom).
input is left open-circuit, the output voltage is set to Uo1 nom
.
Table 9 states typical values required to program the output
Table 10: Rext1 for Uo > Uo nom
;
approximate values (Ui nom, Io = 0.5 Io nom
)
06136
Uo
[% Uo nom
Rext
Vi+
Vo1+
Trim1
Vo1–
4
1
2
17
18
]
Trim [kΩ]
Trim1/ 4 [kΩ]
Rext1
105...108 (107 typically)
0
0
PUL
105
104
103
102
101
100
2.0
4.2
8.2
16
47
∞
4.3
9.0
18
33
91
∞
RPUL
Rext2
Vi–
15
Fig. 15
Input undervoltage lockout adjustment (PUL) and output
voltage adjustment by use of the Trim1 input referenced
to the secondary side (triple output units).
b) Adjustment by means of an external voltage source Uext
(Fig. 16):
For external output voltage adjustment in the range
80...105% of Uo nom a (0...15 V) source Uext is required,
connected to the Trim pin 5 and Vi–. Table 11 below indi-
cates typical Uo versus Uext values. Applying a control
voltage greater 15 V will set the converter into a hiccup
mode. Direct paralleling of the Trim pins of units of the
same type connected in parallel is feasible. (Input resis-
tor of the Trim input is >7 kΩ)
Table 9: Uo1 versus Rext for Uo1 = 80...105% Uo nom; typical
values (Ui nom, Io1/2 = 0.5 Io1/2 nom); triple output units
Uo nom
[V]
Rext1
Rext2
Uo1 [V]
[kΩ]
Uo1 [V]
[kΩ]
3.3
2.8
2.97
3.135
0.75
1.8
4.7
3.3
3.4
3.46
∞
5.6
3.3
5.1
5.0
4.84
4.59
33
9.1
2.2
5.1
5.36
5.25
∞
3
8.5
Table 11: Uo versus Uext for Uo = 80...105% Uo nom
;
typical values (Ui nom, Io = 0.5 Io nom
)
Uo
Uext
[% Uo nom
]
Trim [V]
Trim1/ 4 [V]
voltage Uo1 to approximately the values as indicated.
≥105
102
100
95
85
80
0
1.6
2.5
4.25
8.45
10.5
0
1.5
2.5
4.25
8.25
10.2
The quad output units are shown in block diagram 3. All
types with equal output voltage have the Trim function con-
nected to pin 5 referenced to the primary side which influ-
ences all outputs simultaneously. The schematics are
shown in fig. 16, the values of the adjust resistor Rext in Ta-
ble 10 and the external voltage source in Table 11.
The quad output unit with unequal output voltages have the
Trim1 input (pin 5) referenced to the primary side influenc-
ing only the output of the first power train (Uo1, Uo4).
Edition 5/08.2001 R1
11/18
Board Mountable
DC-DC Converters
IMX 35 Series
Synchronisation (W)
Shut Down Function
This logic input can be used to synchronise the oscillator to
an external frequency source. The input is edge triggered
with TTL thresholds, and requires a source frequency of
490...520 kHz (duty cycle 10...90%). The external source
frequency is internally divided by 2 to define the switching
frequency of the converter. If unused, this pin can be con-
nected to V1– (pin 2) or left open-circuit.
The outputs of the converters may be enabled or disabled
by means of a logic signal (TTL, CMOS, etc.) applied to the
shut down pin. If the shut down function is not required then
it should be left open-circuit.
Converter operating:
2.0...20 V
Converter shut down: –10...0.7 V
Programmable Input Undervoltage Lockout PUL
Reference (Ref)
A special feature of these units is the accurate undervoltage
lockout function which protects the units (and the system)
from large currents caused by operation at low voltages.
This ensures easier start-up in distributed power systems.
The signal output provides a stable 5 V (±0.1 V) reference
signal on pin Ref. It is protected by a 1 kΩ resistor. This sig-
nal may be used also in conjunction with the Trim input pin
5 (primary side) as a limited external voltage reference.
Then we recommend to connect a filter capacitor (0.1 µF)
between Ref and Vi–.
Table 7: Turn on and turn off voltage
Type
Trigger level
7...8
Hysteresis
≤0.5
Units
V
20 IMX 35
40 IMX 35
14...15.5
≤1
See: Electrical input data for a description of the turn on
turn off voltage levels of the various types.
The under voltage lockout levels may be programmed by
use of an external resistor to pull up the preset level as indi-
cated in table 8. (see: Fig. 15).
Table 8: Typical values for Rext and the respective lockout
voltage for input voltage.
20 IMX 35
40 IMX 35
RPUL [kΩ]
RPUL [kΩ]
Ui min [V]
≤8
Ui min [V]
≤15.5
22
∞
∞
43
16
10
0
39
19
13
9.1
10
12
26
14
28
16
32
Edition 5/08.2001 R1
12/18
Board Mountable
DC-DC Converters
IMX 35 Series
Electromagnetic Compatibility (EMC)
which typically occur in many installations, but especially in
battery driven mobile applications.
A suppressor diode together with an input filter form an ef-
fective protection against high input transient voltages
Electromagnetic Immunity
Table 12: Immunity type tests
Phenomenon
Standard 1
Class
Level
Coupling
mode 2
Value
applied
Waveform
Source
Imped.
Test
procedure
In
oper. form.
Per- 3
Electrostatic
discharge
to case
IEC/EN
61000-4-2
2
3
3
contact discharge 4000 Vp
(R pin open)
1/50 ns
330 Ω
10 positive and
10 negative
discharges
yes
B
air discharge
(R pin open)
8000 Vp
Electromagnetic IEC/EN
field
antenna
10 V/m
AM 80%
1 kHz
26…1000 MHz
yes
A
61000-4-3
ENV 50204
PM, 50% duty
cycle, 200 Hz
resp. frequ.
900 MHz
Electrical fast
transient/burst
IEC/EN
61000-4-4
4
direct +i/–i
4000 Vp bursts of 5/50 ns 50 Ω
5 kHz rep. rate
1 min positive
1 min negative
transients per
coupling mode
yes
yes
B
B
transients with
15 ms burst
duration and a
300 ms period
Surge
IEC/EN
61000-4-5 5
3
+i/–i
+i/–i
2000 Vp
1.2/50 µs
2 Ω
5 pos. and 5 neg.
impulses per
coupling mode
EN 50155
D
G
3
1800 V
8400 V
10 Vrms
5/50 µs
0.05/01 µs
100 Ω
50 Ω
triangular
yes
yes
B
A
Conducted
IEC/EN
AM modulated
0.15...80 MHz
disturbancies
61000-4-6
(140 dBµV) 80%, 1 kHz
150 Ω
1 Related and previous standards are referenced in: Technical Information: Standards.
2 i = input, o = output.
3 A = normal operation, no deviation from specification, B = temporary deviation from specs. possibe.
4 For 40 IMX 35 types (additional external components required). Not applicable for 20 IMX 35 types.
5 External components required.
Electromagnetic Emission
[dBµV]
90
07020
80
EN 55022 A
EN 55022 B
70
60
50
40
30
20
10
0
MHz
Fig. 17
Typical disturbance voltage (quasi-peak) at the input ac-
cording to CISPR 11/EN 55011 and CISPR 22/EN 55022,
measured at Ui nom and Io nom. Output leads 0.1 m, twisted.
(40 IMX 35-D12D12-9)
Edition 5/08.2001 R1
13/18
Board Mountable
DC-DC Converters
IMX 35 Series
CISPR 22/EN 55022, Level B Radiated
Electromagnetic emission requirements according to
EN 55022, class B (radiated) can be achieved by adding an
Table 13: Input filter components for EN 55022, level B,
radiated.
external common mode choke and (for 20 IMX 35 types) an
additional capacitor, see: Input Data. The filter components
Type
Current compensated choke
20 IMX 35
40 IMX 35
Murata PLH 10A 7003R6P02
Murata PLH 10A 1112R6P02
should be placed as close as possible to the input of the
converter.
07114
18
13
16
L
07120
V+
Vi+
Module
V–
Vi–
Ø 0.9
Fig. 18
Example for external circuitry to comply with CISPR22/EN
55022, level B, radiated
Fig. 19
Choke dimensions
Immunity to Environmental Conditions
Table 14: Temperature specifications, valid for air pressure of 800...1200 hPa (800...1200 mbar)
Temperature
-8 3
Characteristics
Conditions
Operational 2
min
–40
–40
–55
max
85
Unit
TA
TC
TS
Ambient temperature 1
°C
Case temperature
Storage temperature 1
105
105
Non operational
1 MIL-STD-810D section 501.2 and 502.2
2 See: Thermal Considerations
3 Start up at –55°C
Table 15: MTBF and device hours
MTBF
Ground Benign
Ground Fixed
Ground Mobile
MTBF acc. to MIL-HDBK-217F
40 IMX 35-05D12-8
TC = 40°C
TC = 40°C
TC = 70°C
TC = 50°C
336'000 h
141'000 h
86'000 h
110'000 h
Table 16: Environmental testing
Test Method
Standard
Test Conditions
Status
Ca
Ea
Eb
Fc
Damp heat
steady state
IEC/DIN IEC 60068-2-3
MIL-STD-810D section 507.2 Relative humidity:
Duration:
Temperature:
40 ±2 °C
%
56 days
Unit not
operating
93 +2/-3
Shock
(half-sinusoidal)
IEC/EN/DIN EN 60068-2-27
MIL-STD-810D section 516.3 Bump duration:
Number of bumps:
Acceleration amplitude:
100 gn = 981 m/s2
6 ms
18 (3 each direction)
Unit
operating
Bump
(half-sinusoidal)
IEC/EN/DIN EN 60068-2-29
MIL-STD-810D section 516.3 Bump duration:
Number of bumps:
Acceleration amplitude:
40 gn = 392 m/s2
6 ms
6000 (1000 each direction)
Unit
operating
Vibration
(sinusoidal)
IEC/EN/DIN EN 60068-2-6
Acceleration amplitude:
0.35 mm (10...60 Hz)
5 gn = 49 m/s2 (60...2000 Hz) operating
10...2000 Hz
Unit
Frequency (1 Oct/min):
Test duration:
7.5 h (2.5 h each axis)
Fh
Kb
Vibration
broad-band
random
IEC/EN 60068-2-64
MIL-STD-810D section 514.3 Frequency band:
Acceleration magnitude:
Acceleration spectral density: 0.05 gn2/Hz
Unit
operating
20...500 Hz
4.9 gn rms
(digital control)
Test duration:
3 h (1 h each axis)
Salt mist, cyclic
(sodium chloride
NaCl solution)
IEC/EN/DIN IEC 60068-2-52
Concentration:
Duration:
Storage:
Storage duration:
Number of cycles:
5% (30°C)
Unit not
operating
2 h per cycle
40°C, 93% rel. humidity
22 h per cycle
3
Edition 5/08.2001 R1
14/18
Board Mountable
DC-DC Converters
IMX 35 Series
Mechanical Data
Dimensions in mm. Tolerances ±0.3 mm unless otherwise indicated.
European
Projection
09121
09123
0.8 x 0.8
thread M3
0.8 x 0.8
Tc1
Tc
Tc2
63.5
72.8
63.5
69.6
76.2
option Z
Fig. 20
Case IMX 35 (Standard)
Weight: approx. 70 g
09129
option Y
Fig. 21
IMX 35 open frame (option Z) and 20 IMX 35 triple output,
open frame with base plate (option Y)
Edition 5/08.2001 R1
15/18
Board Mountable
DC-DC Converters
IMX 35 Series
Safety and Installation Instructions
Table 18: Pin allocation
Installation Instructions
Installation of the DC-DC converters must strictly follow the
national safety regulations in compliance with the enclo-
sure, mounting, creepage, clearance, casualty, markings
and segregation requirements of the end-use application.
Pin No.
Double
output
Triple
output
Quad
output
1
2
PUL
Vi–
PUL
Vi–
PUL
Vi–
Connection to the system shall be made via a printed circuit
board with hole diameters of 1.5 mm for the pins.
3
n.c.
n.c.
n.c.
4
Vi+
Vi+
Vi+
The units should be connected to a secondary circuit.
5
Trim
W
n.c.
Trim or Trim1/4
W
Check for hazardous voltages before altering any connec-
tions.
6
W
Do not open the module.
7
Ref
Ref
Ref
Ensure that a unit failure (e.g. by an internal short-circuit)
does not result in a hazardous condition. See also: Safety
of operator accessible output circuit.
8
SD or i
Vo2–
n.c.
SD or i
Vo3–
Vo3+
Vo2+
Vo2–
Vo1–
n.c.
SD or i
Vo3–
Vo3+
Vo2+
Vo2–
Vo1–
Vo1+
Vo4+
Vo4–
n.c.
11
12
13
14
15
16
17
18
19
Input Fuse
Vo2+
n.c.
To prevent excessive current flowing through the input sup-
ply line in case of a short-circuit across the converter input
an external fuse should be installed in a non earthed input
supply line. We recommend a fast acting fuse F8.0A for
20 IMX 35 types, F4.8 A for 40 IMX 35 types.
Vo1–
n.c.
Vo1+
n.c.
Vo1+
Trim1
n.c.
Standards and approvals
All DC-DC converters are pending to be UL recognized ac-
cording to UL 69950, UL recognized for Canada to CAN/
CSA C22.2 No. 950-95 and IEC/EN 60950 standards.
n.c.
09122
The units have been evaluated for:
• Building in
11
12
13
14
15
16
17
18
19
1
2
3
4
5
6
7
8
• Supplementary insulation input to output, based on their
maximum input voltage
• The use in a pollution degree 2 environment
• Connecting the input to a secondary circuit which is sub-
ject to a maximum transient rating of 1500 V.
Bottom
view
After approvals the DC-DC converters are subject to manu-
facturing surveillance in accordance with the above men-
tioned UL, CSA, EN and with ISO 9001 standards.
Fig. 22
Pin allocation
Isolation
The electric strength test is performed as factory test in ac-
cordance with IEC/EN 60950 and UL 1950 and should not
be repeated in the field. Power-One will not honour any
guarantee claims resulting from electric strength field tests.
Protection Degree
The protection degree of the DC-DC converters is IP 30 (not
for option Z).
Table 17: Electric strength test voltages
Cleaning Agents
Characteristic
Input to output
IMX 35
Output to
output
Unit
In order to avoid possible damage, any penetration of
cleaning fluids should be prevented, since the power sup-
plies are not hermetically sealed.
Electric strength
test voltage 1 s
1.2
1.5
-
0.2
-
kVrms
kV DC
MΩ
Notwithstanding this, units with opt. Z leaving the factory
unlqacquered may be cleaned and lacquered by the cus-
tomer.
Insulation resistance
at 500 V DC
>100
Partial discharge
extinction voltage
Consult factory
-
kV
Edition 5/08.2001 R1
16/18
Board Mountable
DC-DC Converters
IMX 35 Series
Safety of operator accessible output circuit
IEC/EN 60950 up to a configured output voltage (sum of
nominal voltages if in series or +/– configuration) of 42 V.
If the output circuit of a DC-DC converter is operator acces-
sible, it shall be an SELV circuit according to the IEC/EN
60950 related safety standards
However, it is the sole responsibility of the installer to en-
sure the compliance with the relevant and applicable safety
regulations. More information is given in: Technical Infor-
mation: Safety.
The following table shows some possible installation con-
figurations, compliance with which causes the output circuit
of the DC-DC converter to be an SELV circuit according to
Table 19: Insulation concept leading to an SELV output circuit
Conditions Front end
DC-DC converter
Result
Supply
voltage
Minimum required grade
of isolation, to be provided DC output safety status of the
Maximum Minimum required
Type
Measures to achieve the Safety status of
specified safety status of the DC-DC
by the AC-DC front end,
including mains supplied from the
battery charger
voltage
front end output
circuit
the output circuit
converter output
circuit
front end 1
Mains
≤250 V AC
Basic
≤60 V
Earthed SELV circuit 2 IMX 35 Operational insulation
(provided by the DC-DC
SELV circuit
converter)
≤75 V
≤60 V
≤75 V
Hazardous voltage
secondary circuit
IMX 35 Input fuse 3 output sup-
pressor diodes 4, and
Earthed SELV
circuit
2
earthed output circuit
Double or reinforced
SELV circuit
IMX 35 Operational insulation
(provided by the DC-DC
converter)
Double or reinforced
insulated unearthed
hazardous voltage
secondary circuit 5
IMX 35 Supplementary insulation
based on the maximum
rated output voltage from
the front end (provided by
the DC-DC converter)
1 The front end output voltage should match the specified input voltage range of the DC-DC converter.
2 The earth connection has to be provided by the installer according to the relevant safety standard, e.g. IEC/EN 60950.
3 The installer shall provide an approved fuse (type with the lowest rating suitable for the application) in a non-earthed input conductor
directly at the input of the DC-DC converter (see fig.: Schematic safety concept). For UL’s purpose, the fuse needs to be UL-listed.
See also: Input Fuse.
4 Each suppressor diode should be dimensioned in such a way, that in the case of an insulation fault the diode is able to limit the output
voltage to SELV (<60 V) until the input fuse blows (see fig.: Schematic safety concept).
5 Has to be insulated from earth by at least basic insulation according to the relevant safety standard, based on the maximum output
voltage from the front end.
10004
Fuse
+
~
Mains
Suppressor
diode
AC-DC
front
DC-DC
con-
Battery
SELV
end
verter
–
~
Earth
connection
Earth
connection
Fig. 23
Schematic safety concept. Use fuse, suppressor diode
and earth connection as per table: Safety concept leading
to an SELV output circuit.
Edition 5/08.2001 R1
17/18
Board Mountable
DC-DC Converters
IMX 35 Series
Description of Options
Table 20: Survey of options
Option
Function of option
Base-plated open frame
Open frame
Types
Y
Z
i
20 IMX 35 triple output types only
All models except 20 IMX 35 triple output types
-
Inhibit
06138
Option i
Inhibit
4
8
2
Vi+
The output of the converter may be enabled or disabled by
means of a logic signal (TTL, CMOS, etc.) applied to the
inhibit pin. No output voltage overshoot will occur when the
unit is turned on. If the inhibit function is not required the
inhibit (pin 8) should be connected to Vi– to enable the out-
put (active low logic, fail safe).
i
Vi–
Converter operating:
Converter inhibited
–10 V...0.8 V
Fig. 25
If the inhibit is not used, the inhibit pin should be con-
or inhibit pin left open circuit: 2.4 V...Ui max
nected to Vi–
Edition 5/08.2001 R1
18/18
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