IMX4 DC-DC Series Data Sheet
4-Watt DC-DC Converters
Features
Input voltage ranges up to 121 VDC
1 or 2 outputs up to 48 VDC
Up to 2000 VDC I/O electric strength test
•
RoHS lead solder exemption compliant
•
Extremely wide input voltage ranges
•
Rated to Basic isolation
•
Electrical isolation, single and dual outputs
•
Immunity to IEC/EN 61000-4-2, -3, -4, -5, -6
•
High efficiency (typ. 82%)
• Flex power: flexible load distribution
•
No load and short-circuit proof
•
High reliability and no derating
•
Operating ambient temperature –40 to +85 °C
•
Industrial and alternative pinout
•
DIL 24 case with 8.5 mm profile
20
0.8"
32
1.25"
8.5
0.34"
1
1
70IMX4
models
Description
The IMX4 Series of board-mountable, 4-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, industry or telecom where variable input voltages or
high transient voltages are prevalent.
Covering a total input voltage range from 8.4 VDC up to
121 VDC with three different types, the converters are
available with single and dual outputs from 3.3 up to ±24 VDC
with flexible load distribution on dual outputs. Features include
efficient input and output filtering with unsurpassed transient
and surge protection, low output ripple and noise, consistently
high efficiency over the entire input voltage range, high
reliability as well as excellent dynamic response to load and
line changes.
The converters exhibit basic insulation and are designed and
built according to the international safety standards IEC/EN
60950 and approved by TÜV, UL, and cUL. 70IMX4 models are
also CE-marked.
A special feature is their small case size, DIL 24 with only
8.5 mm profile. The circuit is comprised of integrated planar
magnetics, and all components are automatically assembled
and solidly soldered onto a single PCB without any wire
connections. Thanks to the rigid mechanical design the
converters withstand an extremely high level of shock and
vibrations. Careful considerations of possible thermal stresses
ensure the absence of hot spots providing long life in
environments where temperature cycles are a reality. The
thermal design allows operation at full load up to an ambient
temperature of 85 °C in free air without using any potting
material.
Several options as open-frame or an alternative industrial
pinout provide a high level of application-specific engineering
and design-in flexibility.
Table of Contents
Page
Page
Mechanical Data .................................................................... 9
Immunity to Environmental Conditions ................................ 10
Safety and Installation Instructions ...................................... 10
Description of Options ......................................................... 11
EC Declaration of Conformity .............................................. 12
Description ............................................................................. 1
Model Selection ..................................................................... 2
Functional Description ........................................................... 3
Electrical Input Data ............................................................... 4
Electrical Output Data ............................................................ 6
Electromagnetic Compatibility (EMC) .................................... 8
NOV 18, 2004 revised to OCT 12, 2006
Page 1 of 12
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IMX4 DC-DC Series Data Sheet
4-Watt DC-DC Converters
Model Selection
Table 1: Model Selection
Output 1
V
o1 nom
I
o1 nom
[ VDC] [mA]
1
3.3
3.3
5
5
5
12
12
12
15
15
15
+5
+5
+5
+12
+12
+15
+15
+24
+24
1
2
Output 2
V
o2 nom
I
o2 nom
[ VDC] [mA]
1
-
-
-
-
-
-
-
-
-
-
-
–5
–5
–5
–12
–12
–15
–15
–24
–24
-
-
-
-
-
-
-
-
-
-
-
350
350
350
170
170
140
140
80
80
Output power
P
o nom
[W ]
3.0
3.0
3.5
3.5
3.5
4.1
4.1
4.1
4.2
4.2
4.2
3.5
3.5
3.5
4.1
4.1
4.2
4.2
3.8
3.8
Input voltage
range
[ VDC]
8.4 to 36
16.8 to 75
8.4 to 36
16.8 to 75
40 to 121
8.4 to 36
16.8 to 75
40 to 121
8.4 to 36
16.8 to 75
40 to 121
8.4 to 36
16.8 to 75
40 to 121
8.4 to 36
16.8 to 75
8.4 to 36
16.8 to 75
8.4 to 36
16.8 to 75
Efficiency
η
typ
[%]
79
80
81
81
81
82
82
82
82
82
82
81
81
81
82
82
82
82
83
83
Model
Options
2
900
900
700
700
700
340
340
340
280
280
280
350
350
350
170
170
140
140
80
80
20IMX4-03-8
40IMX4-03-8
20IMX4-05-8
40IMX4-05-8
70IMX4-05-8
20IMX4-12-8
40IMX4-12-8
70IMX4-12-8
20IMX4-15-8
40IMX4-15-8
70IMX4-15-8
20IMX4-0505-8
40IMX4-0505-8
70IMX4-0505-8
20IMX4-1212-8
40IMX4-1212-8
20IMX4-1515-8
40IMX4-1515-8
20IMX4-2424-8
40IMX4-2424-8
Z
Z
K, Z
K, Z
K
K
K
K
K, Z
K, Z
K, Z
Z
K, Z
K, Z
Z
Z
Flexible load distribution on double outputs possible.
For availibility and lead times ask Power-One.
Part Number Description
20 IMX4 - 05 05 -8 K Z
Input voltage range
V
i
8.4 to 36 VDC ............................................ 20
16.8 to 75 VDC .......................................... 40
40 to 121 VDC ........................................... 70
Series ......................................................................... IMX4
Output voltage type for output 1 ............ 03, 05, 12, 15, 24
Output voltage type for output 2 .................. 05, 12, 15, 24
Operating ambient temperature range –40 to 85 °C ...... -8
Options:
Alternative pinout ......................................... K
Open frame .................................................. Z
40IMX4-0505-8K: dc-dc converter, input voltage range 16.8 to 75 V, 2 outputs providing ±5 V, 350 mA,
temperature range – 40 to 85 °C, alternative pinout.
Example:
NOV 18, 2004 revised to OCT 12, 2006
Page 2 of 12
www.power-one.com
IMX4 DC-DC Series Data Sheet
4-Watt DC-DC Converters
Functional Description
The IMX4 series converters are feedback-controlled flyback
converters using current mode PWM (Pulse Width Modulation).
The input is protected against transients by means of a
suppressor diode.
The output voltage is monitored by a separate transformer
winding close to the secondary windings and fed back to the
control circuit.
Current limitation is provided by the primary circuit, thus limiting
the total output current (I
o nom
for the single- and the sum of
I
o1 nom
and
I
o2 nom
for the dual-output models).
The close magnetic coupling provided by the planar
construction ensures very good regulation and allows for
flexible load distribution on dual-output models.
Vi–
24
03046
Vi+
1
n.c.
2
PWM
13
Vo+
12
Vo–
Fig. 3
Block diagram for single-output models with special
pinout (option K).
03044
Vi+
22
23
14
Vo+
03047
Vi+
1
15
Vo+
PWM
16
Vo–
2
PWM
10
11
Go
Vi–
3
10
Vi–
24
13
Vo–
Fig. 1
Block diagram for single-output models with standard
pinout.
Fig. 4
Block diagram for dual-output models with special pinout
(option K).
03045
Vi+
22
23
14
Vo+
PWM
16
Go
2
Vi–
3
11
Vo–
Fig. 2
Block diagram for dual-output models with standard
pinout.
NOV 18, 2004 revised to OCT 12, 2006
Page 3 of 12
www.power-one.com
IMX4 DC-DC Series Data Sheet
4-Watt DC-DC Converters
Electrical Input Data
General conditions:
T
A
= 25 °C, unless
T
C
is specified.
Table 2: Input Data
Input
Characteristics
V
i
V
i nom
V
i sur
t
start up
t
rise
Input voltage range
Nominal input voltage
Repetitive surge voltage
Converter start-up time
1
Rise time
1
No load input current
Input capacitance
Inrush peak current
Switching frequency
Reflected ripple current
Input RFI level
conducted
Conditions
T
C min
to
T
C max
I
o
= 0 to
I
o nom
abs. max input (3 s)
Worst case condition at
V
i min
and full load
V
i nom
I
o nom
I
o
= 0,
V
i min
to
V
i max
for surge calculation
V
i
=
V
i nom 3
V
i min
to
V
i max
,
I
o
= 0 to
I
o nom
I
o
= 0 to
I
o nom
EN 55011/55022
2
A
resistive load
capacitive load
20IMX4
8.4
20
40
0.25 0.5
5
12
15
0.54
3.7
approx. 400
100
A
20
40IMX4
75
40
100
0.25 0.5
5
12
5
0.3
4.2
approx. 400
60
A
10
70IMX4
Unit
VDC
40
70
150
0.25 0.5
5
12
5
0.15
5.6
approx. 400
30
10
mA
µF
A
kHz
mA
pp
s
ms
121
min typ max min typ max min typ max
36 16.8
4
I
i o
C
i
I
inr p
f
s
I
i rr
u
i RFI
1
2
3
4
Measured with a resistive or max. admissible capacitive load, see fig. 5.
External capacitors required according to table 3.
Source impedance according to ETS 300132-2, version 4.3.
Operation at lower input voltage possible:
P
o
approx. 80% of
P
o nom
at
V
i min
= 14.4 V
Start up
V
o
V
o nom
t
rise
04008a
Filter to Comply with EN 55011/55022
Electromagnetic emission requirements according to table
Electrical Input Data
can be achieved by adding an external
capacitor as close as possible to the input terminals (see fig. 7
and table 3).
t
Vi+
+
C
i
Vi–
04035b
start up
Fig. 5
Converter start-up and rise time
t
Inrush Current
The inrush current has been kept as low as possible by choos-
ing a very small input capacitance. A series resistor may be in-
serted in the input line to limit this current further.
A
3
2
1
0
0
10
20
30
40
µs
04034a
Fig. 7
Input capacitors
Table 3: Input electrolytic capacitors
Model
C
i
20IMX4
100
µF
50 V
40IMX4
47
µF
100 V
70IMX4
330
µF
200 V
Fig. 6
Typ. inrush current at V
i nom
, P
o nom
versus time measured
according to ETS 300132-2, version 4.3 (40IMX4).
NOV 18, 2004 revised to OCT 12, 2006
Page 4 of 12
www.power-one.com
IMX4 DC-DC Series Data Sheet
4-Watt DC-DC Converters
Input Transient Voltage Protection
In many applications transient voltages on the converter input
are always possible. These may be caused for example by
short circuits between Vi+ and Vi–, where the network
inductance may generate high energy pulses.
To protect the converter a large transient voltage suppressor is
fitted to the input, see table below.
Table 4: Built-in transient voltage suppressor
Type
Breakdown
voltage
V
BR nom
40 V
100 V
150 V
Peak power
at 1 ms
P
P
600 W
600 W
600 W
Peak pulse
current
I
PP
10.3 A
4.1 A
2.9 A
Fuse and Reverse Polarity Protection
A suppressor diode on the input also protects against reverse
polarity input voltage. An external fast fuse is required to limit
this reverse current:
Table 6: External input fuse
Model
20IMX4
40IMX4
70IMX4
Fuse type
Fast 1 A
Fast 0.5 A
Fast 0.315 A
20IMX4
40IMX4
70IMX4
If transients generating currents above the peak pulse current
I
PP
are possible, an external limiting network such as the circuit
shown in figure 8 is recommended. It provides compliance with
transients according to IEC/EN 61000-4-5, level 2. The compo-
nents are specified in table 5.
If 40IMX4 models should withstand 150 V transients according
to 19Pfl1, the same external circuitry with similar components
shown in figure 8 can be used.
L
i
Vi+
C
i
+
D
Vi–
04036b
Fig. 8
External circuitry to comply with
IEC/EN 61000-4-5, level 2.
Table 5: Components for the circuitry fig. 8
Model
L
i
C
i
D
20IMX4
330
µH,
0.42
Ω
1A
68
µF,
50 V
ON 1.5KE 39 A
40IMX4
330
µH,
0.42
Ω
0.6 A
68
µF,
100 V
ON 1.5KE 82 A
70IMX4
330
µH,
0.65
Ω
0.3 A
100
µF,
200 V
–
NOV 18, 2004 revised to OCT 12, 2006
Page 5 of 12
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