®
IMX70, IMY70 Series Data Sheet
70 Watt DC-DC Converters
Features
•
RoHS lead-free-solder and lead-solder-exempted
products available
• Extremely wide input voltage ranges up to 150 VDC
• 1 or 2 outputs up to 48 V
• 1200 to 3000 VAC i/o electric strength test
• Electrical isolation between outputs
63.5
2.5"
12.5
0.49"
76.2
3"
• Programmable input undervoltage lockout
• Shutdown/inhibit input
• Adjustable output voltages with flexible load distribution
• Sense lines and current share option
• External frequency synchronization
• Output(s) no-load, overload, and short-circuit proof
• Operating ambient temperature from – 40 to 95 °C
• Thermal protection
• Metallic case with 12.5 mm profile or open frame with
9.75 mm
• Basic insulation: IMX models
• Class I equipment with reinforced insulation: IMY models
47.8
1.88"
9.75
0.38"
72.7
2.86"
Safety-approved to IEC/EN 60950 -1 and UL/CSA 60950-1
2
nd
Edition. CE mark for 110IMY70.
Description
The IMX/IMY70 Series of board-mountable 70 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 14.4 V up to 150 V
with 3 different models, the converters are available with one
or two electrically isolated outputs from 5 V to 48 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 according to the international
safety standards IEC/EN/UL 60950-1 2
nd
Edition. The con-
verters 24IMX70 and 40IMX70 exhibit basic insulation for the
specified input voltage, the converters 110IMY70 have
reinforced insulation.
The circuit is comprised of 2 planar magnetic devices. All
components are automatically assembled and securely
soldered onto a single PCB without any wire connection.
Magnetic feedback ensures maximum repeatability in the
control loop over all operating conditions and best reliability.
Careful consideration of possible thermal stress ensure the
absence of hot spots, such providing long life in environments,
where temperature cycles are present. The thermal design
without using any potting material allows operation up to an
ambient temperature of 65 °C in free air and up to 95 °C with
forced cooling. For extremely high vibration environments the
case has holes for screw mounting.
Table of Contents
Page
Page
Electromagnetic Compatibility (EMC) .................................. 11
Immunity to Environmental Conditions ................................ 12
Mechanical Data .................................................................. 13
Safety and Installation Instructions ...................................... 14
Options ................................................................................. 15
Description ............................................................................. 1
Model Selection ..................................................................... 2
Functional Description ........................................................... 3
Electrical Input Data ............................................................... 4
Electrical Output Data ............................................................ 6
Auxiliary Functions ............................................................... 10
BCD.00002 Rev AB, 2-Mar-2011
Page 1 of 15
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®
IMX70, IMY70 Series Data Sheet
70 Watt DC-DC Converters
Model Selection
Table 1: Model Selection
Output 1
V
o nom
[V]
5.1
5.1
5.1
12
12
12
15
15
15
24
24
24
1
2
3
Output 2
V
o nom
[V]
-
-
-
-
-
-
15
15
15
24
24
24
I
o nom
[A]
-
-
-
-
-
-
2.0
2.0
2.0
1.3
1.3
1.3
Input voltage
V
i min
[V]
14.4
25
50
14.4
25
50
14.4
25
50
14.4
25
50
V
i max
[V]
36
75
150
36
75
150
36
75
150
36
75
150
Effic.
η
1
min.
[%]
87
87
87
88
88
88
85
86
85
87
89
89
typ.
[%]
89
89
89
90
90
90
87
88
87
89
91
91
Model
Adjust
Opt.
I
o nom
[A]
10
10
10
5.8
5.8
5.8
2.0
2.0
2.0
1.3
1.3
1.3
24IMX70-05-0G
3
40IMX70-05-0G
3
110IMY70-05-0G
24IMX70-12-0G
3
40IMX70-12-0G
3
110IMY70-12-0G
3
24IMX70-15-15-0G
3
40IMX70-15-15-0G
3
110IMY70-15-15-0G
3
24IMX70-24-24-0G
3
40IMX70-24-24-0G
3
110IMY70-24-24-0G
secondary
i, T, Z
secondary
i, T, Z
secondary
2
i, Z
secondary
2
i, Z
Efficiency at
T
A
= 25 °C,
V
i nom
,
I
o nom
The R input (pin 19) on the secondary side influences both outputs simultaneously.
Contact Power-One for lead times and availability.
Part Number Description
110 IMY 70 - 24 - 24 - 0 i Z G
Input voltage range
V
i
14.4 to 36 VDC ........................................... 24
25 to 75 VDC .............................................. 40
50 to 150 VDC .......................................... 110
Series .......................................................... IMX70, IMY70
Output voltage of output 1 ............................ 05, 12, 15, 24
Output voltage of output 2 ............................ 05, 12, 15, 24
Operating ambient temperature range
T
A
= –40 to 95 °C ....................................... -0
Options:
Inhibit ........................................................... -i
Current sharing .......................................... T
1
Open frame .................................................. Z
RoHS-compliant for all 6 substances ....... G
2
1
2
Single-output models only
G is always placed at the end of the part number
Product Marking
Converters without option Z are marked with the type
designation, input and output voltages and currents, applicable
safety approval and recognition marks, company logo, date
code, and serial no.
BCD.00002 Rev AB, 2-Mar-2011
Page 2 of 15
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®
IMX70, IMY70 Series Data Sheet
70 Watt DC-DC Converters
influencing the PWM via the magnetic feedback. The 2
nd
output is tracking. The close magnetic coupling of the main
transformer and the main choke guarantee minor deviation of
both output voltages. Both outputs can be simultaneously
adjusted by the R input on the secondary side. The 2
nd
output
is monitored by an additional logic circuitry, which disables the
converter in the case of an overvoltage with automatic restart.
Current limitation is provided by the primary circuit, limiting the
possible output power. The topology allows for a limited output
capacity; see
Electrical Output Data.
An incorporated protection disables the converter in an
overtemperature condition. The converter automatically
recovers, after the temperature has dropped below the limit.
The input voltage is monitored, shutting down the converter in
an overvoltage condition. The minimum input voltage for
startup can be externally influenced, which helps to limit the
input current at low input voltage.
Functional Description
The IMX/IMY70 Series converters are comprised of a
feedback-controlled forward converter using current mode
pulse width modulation (PWM). The output voltage is
transferred to the primary side by magnetic feedback via a
pulse transformer. The switching frequency is fixed and can by
externally synchronized. The main transformer and the output
choke are designed in planar technology, which guarantees
excellent mechanical features and reproducibility of electric
properties.
Single-output converters exhibit at the output a synchronous
rectifier and sense lines to ensure accurate output voltage
regulation. An auxiliary input R allows adjustment of the output
voltage. Proper parallel operation is possible, if the active
current sharing option T is fitted.
Double-output converters use Schottky diodes at both outputs.
The first output voltage is sensed and accurately regulated by
PUL
1
8
W
6
8
JM027
12
n.c.
1
Ref
7
SD
8
Primary
control circuit
Opt. i
PTC
Synchr. rect.
drive
Secondary
control
circuit
11
T
3
19
19
R
Isolation
13
S+
16
Vi+
2
5
Vi+
4
Input
filter
Vi–
2
Vi–
2
3
C
y
1
Vo+
17
14
Vo–
15
13
18
S–
C
y
3
Fig. 1
Not connected
2
Only connected for 24IMX models
Option T
Block diagram of single-output models
PUL
1
8
W
6
8
JM026
PTC
Ref
7
SD
8
17
n.c.
1
Primary
control circuit
V
o2
monitor
Opt. i
Secondary
control
circuit
18
n.c.
1
19
19
R
Isolation
Vo2+
13
Vi+
2
5
Vi+
4
Input
filter
Vi–
2
14
Vo2–
16
Vo1+
Vi–
2
3
C
y
1
15
Vo1–
C
y
11
12
Fig. 2
Not connected
2
Only connected for 24IMX models
n.c.
1
n.c.
1
Block diagram of double-output models
BCD.00002 Rev AB, 2-Mar-2011
Page 3 of 15
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®
IMX70, IMY70 Series Data Sheet
70 Watt DC-DC Converters
Electrical Input Data
General conditions:
T
A
= 25°C, shutdown and R pin left open-circuit, unless specified.
Table 2: Input data
Input
Characteristics
V
i
V
i nom
V
i sur
t
start up
Operating input voltage
1
Nominal input voltage
Repetitive surge voltage
Converter
start-up time
Rise time
No-load input current
Reflected ripple current
Inrush peak current
Input capacitance
Shutdown voltage
Switch on
––
SD high
Conditions
T
A min
to
T
A 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
= 0
→
V
i nom
,
I
o nom
I
o
= 0,
V
i min
–
V
i max
I
o
= 0 –
I
o nom
V
i
=
V
i nom
for surge calculation
Converter disabled
Converter operating
––
I
SD
––
I
i SD
24IMX70
min
14.4
2
24
40.1
typ
max
36
min
25
3
40 IMX70
typ
max
75
(36) 48
100
Unit
VDC
ms
t
rise
I
i o
I
irr
I
inr p
C
i
––
V
SD
mA
mA
pp
A
µF
– 0.7 to +0.7
2 to 20 (or open-circuit)
– 0.7 to +0.7
2 to 20 (or open-circuit)
mA
V
Shutdown pin current
Input current at shutdown
Switching frequency
V
i
min
–
V
i max
approx. 200
approx. 200
kHz
f
s
V
i min
–
V
i max
,
I
o
= 0 –
I
o nom
Input
Characteristics
V
i
V
i nom
V
i sur
t
start up
Operating input voltage
1
Nominal input voltage
Repetitive surge voltage
Converter
start-up time
Rise time
No-load input current
Reflected ripple current
Inrush peak current
Input capacitance
Shutdown voltage
Switch on
––
SD high
Conditions
T
A min
to
T
A max
I
o
= 0 to
I
o nom
Abs. max input (2 s)
Worst case condition at
V
i min
and full load
V
i
= 0
→
V
i nom
,
I
o nom
I
o
= 0,
V
i min
–
V
i max
I
o
= 0 –
I
o nom
V
i
=
V
i nom
for surge calculation
Converter disabled
Converter operating
––
I
SD
––
I
i SD
110IMY70
min
50.4
4
(72) 110
168
250
500
500
5
25
50
200
35
7.7
– 0.7 to +0.7
2 to 20 (or open-circuit)
– 0.2
V
i
min
Unit
max
137.5
5
VDC
typ
ms
t
rise
I
i o
I
irr
I
inr p
C
i
––
V
SD
mA
mA
pp
A
µF
V
Shutdown pin current
Input current at shutdown
Switching frequency
–
V
i max
mA
2
f
s
1
V
i min
–
V
i max
,
I
o
= 0 –
I
o nom
approx. 200
kHz
2
3
4
5
V
i min
will not be as stated, if
V
o
is increased above
V
o nom
by use of R-input. If the output voltage is set to a higher value,
V
i min
will be
proportionately increased.
13.4 V for 100 ms
21.6 V for 100 ms
43.2 V for 100 ms
temporary operation up to 154 V
BCD.00002 Rev AB, 2-Mar-2011
Page 4 of 15
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®
IMX70, IMY70 Series Data Sheet
70 Watt DC-DC Converters
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.
A
40
30
20
10
t
0
20
40
60 μs
Input Transients Protection
When
V
i
exceeds 154 V, the converter is temporarily disabled.
Furthermore, a built-in suppressor diode provides effective
protection against higher input transients, which may be
generated for example by short-circuits across the input lines.
Table 4: Built-in transient voltage suppressor
JM028
Model
Breakdown
voltage
V
Br nom
[V]
Peak power
at 1 ms
P
p
[W]
Peak pulse
current
I
pp
[A]
24IMX70
40IMX70
110IMY70
176
600
2.5
Fig. 3
Inrush current at V
i nom
, P
o nom
versus time (110IMY70-24-24-
8). Source impedance according to ETS 300132-2: L = 10
µH, R = 1.5
Ω
.
V
o
V
o nom
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 to comply with
IEC/EN 61000-4-5; see table 10
Model
24IMX70
40IMX70
Inductor (L)
Capacitor (C)
t
rise
04008b
t
startup
t
110IMY70
--
150 µF / 200 V
Fig. 4
Converter start-up and rise time
L
Vi+
+
Vi–
JM029
Reverse Polarity Protection and Fuse
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.
Fig. 5
Table 3: Recommended external fuses in the non-earthed
input line
Converter model
24IMX70
40IMX70
110IMY70
1
C
Example for external circuitry to comply with IEC/EN 61000-
4-5; see table 10
Fuse type
Littlefuse 808, 2.5 A, 450 VDC, fast acting
1
UL-listed (E67006)
BCD.00002 Rev AB, 2-Mar-2011
Page 5 of 15
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