IMX70, IMY70 Series Data Sheet
70 to 90 Watt DC-DC Converters
Features
• RoHS compliant for all six substances
• Extremely wide input voltage ranges up to 154 VDC
• 1 or 2 outputs up to 48 V
• Basic insulation: IMX models
63.5
2.5"
12.5
0.49"
76.2
3"
• Class I equipment with reinforced insulation: IMY models
• 1500 to 3000 VAC i/o electric strength test voltage
• Electrical isolation between outputs
• 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
47.8
1.88"
9.75
0.38"
72.7
2.86"
• Thermal protection
• Planar technology for best stability
• Metallic case with 12.5 mm profile or open frame with
9.75 mm
Safety-approved to IEC/EN 60950 -1 and UL/CSA 60950-1
2nd 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 154 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 2nd Edition. The converters 24IMX70 and 40IMX70 exhibit basic insulation for the
Table of Contents
specified input voltage, whereas the converters 110IMY70
have reinforced insulation.
The circuit is comprised of 2 planar magnetic devices. The
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 70 °C in free air
and up to 100 °C with forced cooling. For extremely high
vibration environments the case has holes for screw
mounting.
Page
Page
Description ............................................................................ 1
Model Selection ..................................................................... 2
Functional Description .......................................................... 3
Electrical Input Data .............................................................. 4
Electrical Output Data ............................................................ 6
Auxiliary Functions ............................................................... 10
Electromagnetic Compatibility (EMC) ................................. 11
Immunity to Environmental Conditions ............................... 12
Mechanical Data .................................................................. 13
Safety and Installation Instructions ..................................... 14
Options ................................................................................ 15
Copyright © 2015, Bel Power Solutions Inc. All rights reserved.
BCD.00002 Rev AH, 17-Aug-2015
MELCHER
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Page 1 of 15
IMX70, IMY70 Series Data Sheet
70 to 90 Watt DC-DC Converters
Model Selection
Table 1: Model Selection
Output 1
1
2
3
Output 2
Effic. η1
Input voltage
[V]
Vi cont
[V]
Vi max2
-
12
21.6
43.2
15 to 33.6
25 to 72
50 to 137.5
40.1
75
154
89.5
91
-
-
12
21.6
43.2
15 to 33.6
25 to 72
50 to 137.5
40.1
75
154
91
93
90
93
5.7
6.0
6.0
-
-
12
21.6
43.2
15 to 33.6
25 to 72
50 to 137.5
40.1
75
154
91
92
90
93
1.3
1.3
1.3
24
24
24
1.3
1.3
1.3
12
21.6
43.2
15 to 33.6
25 to 72
50 to 137.5
40.1
75
154
87
90
89
91
Vo nom
[V]
Ionom
[A]
Vo nom
[V]
Io nom
[A]
V i min2
5.1
5.1
5.1
12
12
12
-
12
12
12
7.0
7.5
7.5
15
15
15
24
24
24
[V]
min.
[%]
Model
Opt.
24IMX70-05-0TG 3
40IMX70-05-0TG 3
110IMY70-05-0TG
i, Z
24IMX70-12-0TG
40IMX70-12-0TG 3
110IMY70-12-0TG
i, Z
24IMX70-15-0TG
40IMX70-15-0TG 3
110IMY70-15--0TG
i, Z
24IMX70-24-24-0G
40IMX70-24-24-0G 3
110IMY70-24-24-0G
i, Z
typ.
[%]
Efficiency at TA = 25 °C, Vi nom, Io nom
Short time; see table 2 for details
Contact the Company for lead times and availability.
Note: The sequence of options/features must follow the order above.
Part Number Description
110 IMY 70 - 24 - 24 - 0 i Z G
Input voltage Vi
24 V battery ................................................ 24
36 V and 48 V battery ................................. 40
72 V, 96 V, 110 V battery .......................... 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
TA = –40 to 95 °C ...................................... - 0
Options:
Inhibit ............................................................ i
Current sharing function ........................... T 1
Open frame ................................................. Z
Feature:
RoHS-compliant for all 6 substances ...... G 2
1
2
Standard feature for single-output models, not available for dual-output models
G is standard and is placed at the end of the part number
Note: The sequence of options/features must follow the order above.
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.
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Page 2 of 15
IMX70, IMY70 Series Data Sheet
70 to 90 Watt DC-DC Converters
Functional Description
The IMX/IMY70 Series converters are comprised of a
feedback-controlled forward converter using current-mode
pulse width modulation (PWM). The switching frequency is
fixed; it can by externally synchronized for double-output
models. The main transformer and the output choke are
designed in planar technology, which guarantees excellent
mechanical features and reproducibility of electric properties.
No optocouplers are used.
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 using the current
sharing feature.
Double-output converters exhibit Schottky diodes at both
outputs. The first output voltage is sensed and accurately
regulated by influencing the PWM via the magnetic feedback.
n.c.1
1
8
6
8
The input voltage is monitored, shutting down the converter in
an overvoltage condition. The minimum input voltage for startup can be externally adjusted, which helps to limit the input
current at low input voltage.
JM027c
11 T
8
Secondary
control circuit
Isolation
Vi+
An incorporated protection disables the converter in an
overtemperature condition. The converter automatically
recovers, after the temperature has dropped below the limit.
Primary
control circuit
Opt. i
2
A current limitation circuits limits the possible output power.
The topology allows for single-output models an unlimited
output capacity and for double-output models a high output
capacity; see Electrical Output Data.
1 kΩ
Ref 7
SD
PUL
The output voltage is transferred to the primary side by
magnetic feedback via a pulse transformer. The 2nd 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 located on the secondary side.
5
19
19 R
Synchr. rect.
drive
13 S+
NTC
16
Vo+
Vi+
4
17
Input
filter
Vi– 2
14
Vo–
Vi–
2
15
Auxiliary
converter
350 kHz
3
Cy
13 S–
18
Cy
12
1
Fig. 1
2
Not connected
n.c.1
Connected for 24IMX models only
Block diagram of single-output models
SD
W
1
8
6
8
JM026c
1 kΩ
11 n.c.1
Primary
control circuit
8
Opt. i
Secondary
control circuit
Isolation
Ref 7
PUL
19 R
19
PTC
13 Vo2+
Vi+ 2 5
Vi+
4
14 Vo2–
Input
filter
Vi–
16 Vo1+
2
Vi– 2 3
15 Vo1–
Cy
Fig. 2
1
Not connected
2
Cy
Connected for 24IMX models only
18
17
12
n.c.1
n.c.1
n.c.1
Block diagram of double-output models
BCD.00002 Rev AH, 17-Aug-2015
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Page 3 of 15
IMX70, IMY70 Series Data Sheet
70 to 90 Watt DC-DC Converters
Electrical Input Data
General conditions:
TA = 25°C, shutdown and R pin left open-circuit, unless specified.
Table 2: Input data
Input
24IMX70
Conditions
min
Vi
Operating input voltage
TA min to TA max, Io = 0 – Io nom
15 1
Vi nom
Nominal input voltage
Vi 2s
Temporary input voltage
for 2 s, no shutdown
12 1
Vi sur
Repetitive surge voltage
shutdown, no damage
50
t start up
Converter
start-up time
Worst case condition at
Vi min and full load
500
Switch on
––
SD high
typ
40 IMX70
Characteristics
max
min
33.6
25 1
40.1
21.6 1
24
typ
Unit
max
72
VDC
(36) 48
75
100
ms
500
t rise
Rise time
Vi = 0 → Vi nom, Io nom
Ii o
No-load input current
Io = 0, Vi min – Vi max
Iirr
Reflected ripple current
Io = 0 – Io nom
Iinr p
Inrush peak current
Vi = Vi max
25
A
Ci
Input capacitance
for surge calculation
24
µF
V ––
Shutdown voltage
Converter disabled
SD
25
200
30
– 0.7 to +0.7
Converter operating
I S–D–
Shutdown pin current
I i S–D–
Input current at shutdown
Vi
fs
Switching frequency
Vi min – Vi max, Io = 0 – Io nom
mA
– 0.7 to +0.7
2 to 20 (or open-circuit)
– Vi max
V
2 to 20 (or open-circuit)
– 0.2
min
mA
2
200 2
Input
210 2
110IMY70
Characteristics
mApp
Conditions
min
TA min to TA max, Io = 0 – Io nom
typ
kHz
Unit
max
Vi
Operating input voltage
Vi nom
Nominal input voltage
Vi 2s
Temporary input voltage
for 2 s, no shutdown
Vi sur
Repetitive surge voltage
shutdown, no damage
t start up
Converter
Switch on
start-up time ––
SD high
Worst case condition at
Vi min and full load
t rise
Rise time
Vi = 0 → Vi nom, Io nom
Ii o
No-load input current
Io = 0, Vi min – Vi max
I irr
Reflected ripple current
Io = 0 – Io nom
I inr p
Inrush peak current
Vi = Vi max
35
A
Ci
Input capacitance
for surge calculation
7.7
µF
VS–D–
Shutdown voltage
Converter disabled
– 0.7 to +0.7
V
I S–D–
Shutdown pin current
I i S–D–
Input current at shutdown
Vi
fs
Switching frequency
Vi min – Vi max, Io = 0 – Io nom
2
137.5
VDC
(72, 96,) 110
Converter operating
1
50
200
43.2 1
154
168
250
500
25
25
50
mA
200
mA pp
2 to 20 (or open-circuit)
– 0.2
min
ms
500
– Vi max
mA
2
200 2
210 2
kHz
Vi min will not be as stated, if Vo is increased above Vo nom by use of R-input. If the output voltage is set to a higher value, Vi min will be
proportionately increased.
typ. 240 kHz for single-output models, typ. 300 kHz for models with 5 V output
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Page 4 of 15
IMX70, IMY70 Series Data Sheet
70 to 90 Watt DC-DC Converters
Inrush Current
Input Transients 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, in order to further reduce this
current.
When Vi 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
A
JM028
Model
40
30
Breakdown
voltage
VBr nom [V]
Peak power
at 1 ms
Pp [kW]
Peak pulse
current
I pp [A]
56
1.5
19.4
176
0.6
2.5
24IMX70
20
40IMX70
10
110IMY70
20
0
60 µs
40
t
Fig. 3
Inrush current at Vi nom, Po nom versus time (110IMY70-24-248). Source impedance according to ETS 300132-2: L = 10
µH, R = 1.5 Ω.
Vo
trise
Vo 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
04008b
Model
Inductor (L)
Capacitor (C)
--
330 µF / 100 V
--
150 µF / 200 V
24IMX70
40IMX70
t
tstartup
110IMY70
Fig. 4
Converter start-up and rise time
JM029
L
Vi+
Reverse Polarity Protection and Fuse
C
The built-in suppressor diode also provides for reverse
polarity protection at the input by conducting current in the
reverse direction. An external fuse is required to limit this
current.
Table 3: Recommended external fuses in the non-earthed
input line
Converter model
Fuse type
24IMX70 single-output
Littlefuse 166
10 A, 80 V
24IMX70 double-output
Littlefuse 166
10 A, 80 V
+
Vi–
Fig. 5
Example for external circuitry to comply with IEC/EN 610004-5; see table 10
Rating
40IMX70 single-output
40IMX70 double-output
110IMY70 single-output
Littlefuse 372
3.15 A, 250 V
110IMY70 double-output Littlefuse 372
3.15 A, 250 V
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Page 5 of 15
IMX70, IMY70 Series Data Sheet
70 to 90 Watt DC-DC Converters
Electrical Output Data
General conditions:
– TA = 25 °C, unless TC is specified
– Shutdown pin not connected
– R-pin not connected
Table 6: Output data for single-output models
Output
5.1 V
Characteristics
Vo
Output voltage
Io nom
Output current
24IMX
Conditions
min
typ
max
min
typ
max
5.07
5.1
5.13
11.94
12.0
12.06
7.0
40IMX
12
7.5
110IMY
12
24IMX
40IMX
Vi min – Vi max
13.6
∆Vo
Line/load regulation
Vi min – Vi max,
(0.1 – 1) Io nom
Vo noise
Output voltage noise
Vi min – Vi max
I o = Io nom
Vo OS
Output overshot at turn-on
Vi min – Vi max
Vo L
Output overvoltage limit
Min. load 1%
Co ext
Capacitive load
td
α Vo
1
2
3
4
5
Dynamic
load
regulation
Voltage deviat.
Recovery time
Temperature coefficient
∆Vo /∆TC
13.9
2
3
Vi nom
(0 ↔ 0.5) Io nom or
(0.1 ↔ 0.6) Io nom
Vi min – Vi max
I o = (0.1 to 1) Io nom
6.0
V
A
7.5
Vi nom, TC = 25 °C
Vo = 93% Vo nom
110IMY
Vo d
Unit
Vi nom, 0.5 Io nom
12
Current limit 1
IoL
12 V
14.4
7.5
8.0
8.5
8.5
8.8
9.2
±0.5
±0.5
%
100
150
mVpp
50
80
0.1
0.24
7.0
13.5
V
15
unlimited
unlimited
µF
±1000 4
±1800 5
mV
2
2
ms
±0.02
±0.02
%/K
Rectangular characteristic Vo /I o
BW = 20 MHz, measured with an external capacitor of 1 µF across each pair of output pins.
Measured with a probe according to EN 61204
With an output cap Co = 2200 µF: ±250 mV
With an output cap Co = 1500 µF: ±600 mV
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IMX70, IMY70 Series Data Sheet
70 to 90 Watt DC-DC Converters
Table 7: Output data for single- and double-output models; general condition as per table 6.
Output
Characteristics
Vo
Output voltage
Io nom
Output current
Current limit 1
IoL
Conditions
min
typ
max
min
Vi nom, 0.5 Io nom
14.93
15.0
15.08
23.88
6.0
2 × 1.3
6.0
24IMX
Vi nom, TC = 25 °C
Vo = 93% Vo nom
Line/load regulation
Vi min – Vi max,
(0.1 – 1) Io nom
Vo noise
Output voltage noise
Vi min – Vi max
I o = Io nom
Output overshot at turn-on
Vo L
Output overvoltage limit
Co ext
Admissible capacitive load
Vo d
Dynamic
load
regulation
1
2
3
4
5
6
7
24.12
40IMX
∆Vo
α Vo
24.0
110IMY
40IMX
td
max
2 × 1.3
Vi min – Vi max
Voltage deviat.
Recovery time
Temperature coefficient
∆Vo /∆TC
Unit
typ
5.7
24IMX
110IMY
Vo OS
2 × 24 V
15 V
V
A
2 × 1.3
6.2
7.0
6.6
7.5
3.0
3.15
3.3
3.0
3.15
3.3
3.0
3.15
3.3
±0.5
±0.5
%
2
150
200
mVpp
3
100
150
Vi min – Vi max
0.3
Min. load 1%
16.8
0.48
18
unlimited
Vi nom
Io nom ↔ 1/2 Io nom
V
4
1500 6 7
0
µF
±1500 5
±1500
mV
2
1
ms
Vi min – Vi max
I o = (0.1 to 1) Io nom
±0.02
±0.02
%/K
The current limit is primary side controlled. In 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 each output pins.
Measured with a probe according to EN 61204
Both outputs of double-output models are protected by a suppressor diode.
With an output cap Co = 1500 µF: ±750 mV
Both outputs of double-output models connected in parallel. For series connection, only 1/4 of the capacitance is possible.
1000 µF for 110IMY70-24-24 produced before 2012
Thermal Considerations
Fig. 6a and 6b specify the admissible output power of a
converter, mounted on a printed circuit board, located in free
environment, exposed to an airflow with the ambient
temperature TA. This applies to continuous operation in the
input voltage range Vi min to Vi max; see table 2, Input data. The
case temperature TC (TC Z for 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.
The installer must ensure that under all operating conditions TC
(TC Z) remain within the limits stated in the table Temperature
specifications.
Io / Io nom
JM036b
1.0
1 m/s = 200 LFM
0.8
0.5 m/s = 100 LFM
0.6
natural cooling
However, the reached temperature TC depends heavily on the
conditions of operation, the distance and temperature of
surrounding components, the orientation of the converter and
the airflow, and the surfaces, thickness, and properties of the
printed circuit board.
Caution: The case temperature TC (TC Z for option Z), measured
at the temperature measuring point (see Mechanical Data) may
under no circumstances exceed the specified maximum value.
BCD.00002 Rev AH, 17-Aug-2015
0.4
0.2
0
20
40
60
80
100
°C
TA
Fig. 6a
Maximum allowed output power versus ambient temperature
for cased models 24IMX70-24-24-0 and 110IMY70-24-24-0
(with rev. AB or greater).
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IMX70, IMY70 Series Data Sheet
70 to 90 Watt DC-DC Converters
Overtemperature Protection
Io / Io nom
0.4
The converter is protected against possible overheating by
means of an internal temperature monitoring circuit. It shuts
down the converter above the internal temperature limit and
attempts to automatically restart. This feature prevents
excessive internal temperature building up, which could occur
under heavy overload conditions.
0.2
Short Circuit Behavior
JM039b
1.0
1 m/s = 200 LFM
0.8
0.5 m/s = 100 LFM
0.6
natural cooling
0
20
40
60
80
100
°C
TA
Fig. 6b
Maximum allowed output power versus ambient temperature
for 24IMX70-24-24-0Z and 110IMY70-24-24-0Z (with rev. AB
or greater).
The current limiting circuit decreases the output voltage, when
an overcurrent occurs. It protects against a short circuit and
automatically recovers after removal of the overload condition.
If one output of double-output models is overloaded, the
current limiting circuit decreases the output voltage of output 1
and simultaneously of the tracking output 2.
Vo
Vo nom
Io / Io nom
JM118
1.0
0.98
0.8
0.6
0.5
natural cooling
0.4
0.2
0
20
40
60
80
100
°C
TA
Fig. 6c
Io
Io nom
JM097
0
Fig. 7
0.5
1.0
IoL
Rectangular current limitation of single-output models
Max.allowed output power versus ambient temperature for
converters 110IMY70-12 without opt. Z in vertical position.
Vo [%]
overload condition
100
Io / Io nom
JM099b
1.0
switch-off
70
05041c
0.8
0.6
natural cooling
0.4
0
t
Fig. 8
0.2
0
0.3 s
20
40
60
80
100
°C
Current limitation of double-output models with both outputs
connected in parallel
TA
Connection in Series
Fig. 6d
Max. allowed output power versus ambient temperature for
converters 110IMY70-12-0Z in vertical position.
The outputs of all models may be connected in series without
any precaution.
Connection in Parallel
If single-output converters are to be operated in parallel, we
recommend ordering option T.
Both outputs of a double-output converter can be connected in
parallel without precaution and will share their currents evenly.
BCD.00002 Rev AH, 17-Aug-2015
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Page 8 of 15
IMX70, IMY70 Series Data Sheet
70 to 90 Watt DC-DC Converters
Note: If output 2 of a double-output converter is not used, connect
it parallel to output 1.
Single-output converters without option T or double-output
converters with the same nominal output voltage should only
be operated in parallel with some precautions. The output
lines to the load should have the same length and section. To
improve the current repartition, small resistors should be
present in the output lines. If ORing diodes are used, double
Schottky diodes should be chosen to keep both diodes at the
same temperature level. If single diodes are chosen, they
should be mounted on the same heat sink. If the total load
exceeds 150% of the nominal load of one converter, start-up
problems are possible.
Note: Instead of connecting two 24 V models in parallel, we
recommend connecting of two 12 V models in series.
η [%]
JM163
100
Vi = 110 V
Vi = 50 V
90
80
Vi = 137 V
70
60
0
2
6
4
8
Io / Io nom
Fig. 10b
Efficiency versus input voltage and load. Typical values
(110IMY70-05)
Cross Regulation of Double-Output Models
η [%]
See fig. 9. General conditions:
– TA = 25°C, unless TC is specified.
– Shutdown and R pin left open-circuit.
JM098
100
Vi = 50 V
90
Vo / Vo nom
JM030a
1.1
Vi = 110 V
80
Vi = 137 V
Vo2
1.05
70
1.0
Vo1
0.95
60
0.9
0
2
6
4
8
Io / Io nom
Fig. 10c
0.85
0
0.2
0.4
0.6 0.8 1.0 1.2 1.4 1.6 1.8 Io / Io nom
Efficiency versus input voltage and load. Typical values
(110IMY70-12)
η [%]
Fig. 9
JM040a
100
Cross regulation of double-output models (typ.)
Vo2 versus Io2, Io1 = 0.5 Io1 nom
Vi = 50 V
90
Efficiency
Vi = 110 V
80
Vi = 150 V
η [%]
JM096
100
Vi = 15 V
90
60
Vi = 24 V
Vi = 33.6 V
80
0
0.2
0.4
0.6
0
0.2
0.4
0.6
0.8
Io / Io nom
Fig. 10d
Efficiency versus input voltage and load. Typical values
(110IMY70-24-24)
70
60
70
0.8
Io / Io nom
Fig. 10a
Efficiency versus input voltage and load. Typical values
(24IMX70-24-24)
BCD.00002 Rev AH, 17-Aug-2015
MELCHER
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Page 9 of 15
IMX70, IMY70 Series Data Sheet
70 to 90 Watt DC-DC Converters
Auxiliary Functions
Note: This feature allows connecting the outputs together through
ORing diodes to achieve redundancy. We recommend Schottky
diodes mounted onto the same heat sink (for thermal balancing).
Adjustable Output Voltage
As a standard feature, the converters offer adjustable output
voltages by using the control input R. Fig. 10 shows the
schematic diagram of the circuitry. If the control input is left
open-circuit, the output voltage is set to Vo nom.
Note: For output voltages Vo > Vo nom, the minimum input voltage
Vi min (see Electr. Input Data) increases proportionally to Vo /Vo nom.
06029e
Vi+
Vo+
Vref = 2.5 V
Rext2
4 kΩ
R
+
Control
logic
Vi–
The sense inputs of single-output models allow for compensating a voltage drop up to 1 V (0.6 V for models with Vo nom = 5.1 V).
Synchronization (W)
Double-output models can be synchronized to an external TTL
signal (220 ±10 kHz, duty cycle 10 – 15%). Due to the higher
switching frequency, the efficiency will slightly drop.
Note: If this feature is not used, W (pin 6) can be connected to Vi–
(pin 2) or left open-circuit.
+
__
Shutdown (SD)
Vext
Rext1
Vo–
Sense Lines
–
Fig. 11
Output voltage control by means of the R input
The R-input is referenced to the secondary side of the
converter. Adjustment of Vo (or Vo1) is possible by means of
either an external resistor or a voltage source.
a) Adjustment by means of an external resistor Rext.
Depending upon the value of the required output voltage,
the resistor shall be connected:
either: Between the R-pin and Vo– (or Vo1) to achieve an
output voltage adjustment range of Vo ≈ 80 to 100 % of
Vo nom. Single-output models can be trimmed to Vo ≈ 0 V.
Vo
Rext1 ≈ 4 kΩ • –––––––––
Vo nom – Vo
or: Between the R-pin and Vo+ (or Vo1+) to achieve an
output voltage range of Vo ≈ 100 to 105% of Vo nom.
(Vo – 2.5 V)
Rext2 ≈ 4 kΩ • ––––––––––
––––––––
2.5 V • (Vo /Vo nom – 1)
The outputs of the converters may be enabled or disabled by a
logic signal (TTL, CMOS, etc.) applied between the shutdown
pin 8 and Vi–. If the shutdown function is not required, pin 8
should be left open-circuit. Voltage on pin 8:
Converter operating:
Converter disabled:
2.0 to 20 V
– 0.7 to +0.7 V
Progr. Input Voltage Lockout PUL
A special feature of these converters is the adjustable undervoltage lockout function, protecting the converter (and system)
from high currents caused by operation at too low input voltage. This ensures easier start-up in distributed power systems.
The undervoltage lockout level can be programmed by an
external resistor R PUL (between PUL and Vi –) to increase the
preset levels, as indicated in the table below (with hysteresis).
The overvoltage lockout (OVL) cannot be varied.
Table 8: Turn-on and shutdown voltage (pin 1 left open)
b) Adjustment by means of an external voltage Vext between
Vo– (or Vo1–) and the R-pin.
The control voltage range is 1.96 to 2.62 V and allows for
adjustment in the range of Vo ≈ 80 to 105% of Vonom. Singleoutput models can be trimmed to Vo ≈ 0 V.
Vo • 2.5 V
Vext ≈ ––––––––
Vo nom
Model
Turn -on level
Hysteresis
OVL
Unit
24IMX70
13.5 – 14.5
typ. 2.5
41 – 43
V
40IMX70
22 – 23.5
110IMY70
44.5 – 47.5
typ. 6
160 – 175
Table 9: Typical values for R PUL and the respective turn-on
input voltage Vi LO.
Note: Single-output models can be trimmed up to 110% of Vo nom.
Note: Applying a higher external control voltage as needed for the
max. trim range may damage the converter.
24I MX70
R PUL [k Ω ]
40 IMX70
R PUL [k Ω ]
ViLO [V] single-op. double-op. Vi LO [V] single-op. double-op.
14
∞
∞
Reference Output (Ref)
16
40.5
120
The converter provides a stable 5 V (±0.25 V) reference signal
on pin 7 (Ref). The output is protected by a 1 kΩ resistor.
18
19.8
62
20
12.8
41
Note: It is recommended to connect a filter capacitor (0.1 µF)
between Ref and Vi–, if Ref is used.
110 IMY70
Vi LO [V]
∞
24
Ω]
R PUL [kΩ
R PUL [k Ω]
single-output double-output
Current Sharing (T)
46
∞
∞
This feature is available for single-output models. Several
parallel connected converters will share their current evenly by
interconnecting the T pins (pin 11).
50
68
270
57
25.5
110
61
18
82
BCD.00002 Rev AH, 17-Aug-2015
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∞
Page 10 of 15
IMX70, IMY70 Series Data Sheet
70 to 90 Watt DC-DC Converters
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 batterydriven mobile applications.
Electromagnetic Immunity
Table 10: Immunity type tests
Phenomenon
Standard
Electrostatic
discharge
to case
IEC/EN
61000-4-2
Electromagnetic
field
Class
Level
Electrical fast
transients/burst
Value
applied
Waveform
Source
imped.
Test
procedure
contact discharge
(R pin open)
±6000 Vp
1/50 ns
330 Ω
3
air discharge
(R pin open)
±8000 Vp
10 positive and
10 negative
discharges
x4
antenna
20 V/m
80% AM, 1 kHz
n.a.
80 – 1000 MHz
yes
A
5
antenna
20 V/m
80% AM, 1 kHz
n.a.
800 – 1000 MHz
yes
A
3
IEC/EN
61000-4-3
36
IEC/EN
61000 -4- 4:
2004
4
3
Surges
IEC/EN
61000-4-5
Conducted
disturbances
1
IEC/EN
61000-4-6
In
Perf- 2
oper. crit.
Coupling
mode 1
direct coupl. (fig. 9)
+i/c, –i/c,+i/–i
capacit. (fig. 10), o/c
10 V/m
1400 – 2100 MHz
5 V/m
2100 – 2500 MHz
±2000 Vp6 bursts of 5/50 ns
5 kHz over 15 ms
±4000 Vp
burst period: 300
±2000 Vp
ms
50 Ω
12 Ω
37
+i/c, –i/c
±2000 Vp
27
+i/–i
±1000 Vp3
38
i, o, signal wires
10 VAC
(140 dBµV)
3
1.2/50 µs
AM 80%
1 kHz
60 s positive
60 s negative
transients per
coupling mode
yes
B
yes
A
yes
B
yes
B
yes
B
2Ω
5 pos. and 5 neg.
surges per
coupling mode
150 Ω
0.15 – 80 MHz
yes
A
i = input, o = output, c = case (not for option Z)
A = normal operation, no deviation from specification, B = temporary deviation from specs. possible.
Corresponds to EN 50121-3-2:2006, table 9.3
Corresponds to EN 50121-3-2:2006 table 9.1 and exceeds EN 50121-4:2006 table 1.1.
Corresponds to EN 50121-3-2:2006 table 9.2 and EN 50121-4:2006 table 1.2 (compliance with digital mobile phones).
Corresponds to EN 50121-3-2:2006 table 7.2 and EN 50121-4:2006 table 2.2.
Measured with an external input capacitor specified in table 5
Corresponds to EN 50121-3-2:2006 table 7.1 and EN 50121-4:2006 table 2.2.
2
3
4
5
6
7
8
Electromagnetic Emissions
dbµV
The EMC requirements must be observed at the end product
system level. However, we test the converters to EMC
standards. An effective integrated input filter significantly
reduces the reflected input current and improves EMC
features. Further improvements are possible by adding
simple external filters.
JM037
80
EN 55022 A qp
EN 55022 A avr
60
40
20
0
0.2
0.5
1
2
5
10
20 MHz
Fig. 12
Typical disturbance voltage at the input (green = peak, x =
quasi-peak, pink = average) according to EN 55011/ 22,
measured at Vi nom and Io nom. Output leads = 0.1 m, twisted
(110IMY70-24-24).
BCD.00002 Rev AH, 17-Aug-2015
MELCHER
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Page 11 of 15
IMX70, IMY70 Series Data Sheet
70 to 90 Watt DC-DC Converters
Immunity to Environmental Conditions
Table 11: Mechanical and climatic stress
Test method
Standard
Test conditions
Status
Cb
Damp heat
steady state
IEC/EN 60068-2-56
Temperature:
Relative humidity:
Duration:
25 °C
95 %
8h
Converter
operating
Cab
Damp heat
steady state
IEC/EN 60068-2-78
MIL-STD-810D section 507.2
Temperature:
Relative humidity:
Duration:
40 ±2 °C
93 +2/-3 %
56 days
Converter
not
operating
Db
Damp heat test,
cyclic
EN 50155:2007, clause 12.2.5
IEC/EN 60068-2-30
Temperature:
Cycles (respiration effect):
Duration:
55 °C and 25 °C
2
2× 24 h
Converter
not
operating
Bd
Dry heat test
steady state
EN 50155:2007, clause 12.2.4
IEC/EN 60068-2-2
Temperature:
Duration:
70 °C
6h
Converter
operating
Ad
Cooling test
steady state
EN 50155:2007, clause 12.2.3
IEC/EN 60068-2-1
Temperature, duration
Performance test
–40 °C, 2 h
+25 °C
Conv. not
operating
--
Salt mist test
sodium chloride
(NaCl) solution 2
EN 50155:2007
clause 12.2.10
class ST2 2
Temperature:
Duration:
35 ±2 °C
16 h
Converter
not
operating
Fc
Vibration
(sinusoidal)
IEC/EN 60068-2-6
MIL-STD-810D section 514.3
Acceleration amplitude:
Converter
operating
Frequency (1 Oct/min):
Test duration:
0.35 mm (10 – 60 Hz)
5 g n = 49 m/s2 (60 - 2000 Hz)
10 – 2000 Hz
7.5 h (2.5 h in each axis)
Fh
Random vibration
broad-band
(digital control) and
guidance
IEC/EN 60068-2-64
Acceleration spectral density:
Frequency band:
Acceleration magnitude:
Test duration:
0.05 g n2/Hz
8 – 500 Hz
4.9 g rms
1.5 h (0.5 h in each axis)
Converter
operating
Eb
Bump
(half-sinusoidal)
IEC/EN 60068-2-29
MIL-STD-810D section 516.3
Acceleration amplitude:
Bump duration:
Number of bumps:
25 gn = 245 m/s2
6 ms
6000 (1000 in each direction)
Converter
operating
Ea
Shock
(half-sinusoidal)
IEC/EN 60068-2-27
MIL-STD-810D section 516.3
Acceleration amplitude:
Bump duration:
Number of bumps:
50 gn = 490 m/s2
11 ms
18 (3 in each direction)
Converter
operating
--
Shock
EN 50155:2007 clause 12.2.11,
EN 61373 sect. 10,
class B, body mounted 1
Acceleration amplitude:
Bump duration:
Number of bumps:
5.1 gn
30 ms
18 (3 in each direction)
Converter
operating
--
Simulated long life
testing at
increased random
vibration levels
EN 50155:2007 clause 12.2.11,
EN 61373 sect. 8 and 9,
class B, body mounted 1
Acceleration spectral density:
Frequency band:
Acceleration magnitude:
Test duration:
0.02 g n2 / Hz
5 – 150 Hz
0.8 g n r ms
15 h (5 h in each axis)
Converter
operating
1
2
Body mounted = chassis of a railway coach
Models with option Z have been covered by lacquer (Peters SL1301) to simulate the end-use situation.
BCD.00002 Rev AH, 17-Aug-2015
MELCHER
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Page 12 of 15
IMX70, IMY70 Series Data Sheet
70 to 90 Watt DC-DC Converters
Temperatures
Table 12: Temperature specifications, valid for air pressure of 800 to 1200 hPa (800 to 1200 mbar)
Temperature
-0
Unit
Characteristics
Conditions
min
max
TA
TC
Ambient temperature
Case temperature (without opt. Z) 2
In operation 1
–40
–40
100 1
105 2
TC Z
Component temp. with opt. Z 2
–40
115 2
TS
Storage temperature
– 55
105
1
Not operational
°C
See Thermal Considerations
Temperature measurement point; see Mechanical Data
2
Reliability
Table 13: Calculated MTBF at nominal load
Model
Ground benign
40 °C
24IMX70-24-24 (Bellcore Telc. SR-332)
Ground fixed
40 °C
70 °C 1
Ground mobile
50 °C
1 022 000
510 000
110IMY70-05 (Bellcore Telc. SR-332)
720 000
360 000
98 000
98 000
110IMY70-12 (Bellcore Telc. SR-332)
825 000
413 000
182 000
106 000
1 000 000
632 000
163 000
117 400
110IMY70-24-24 (Bellcore Telc. SR-332)
1
162 500
Device hours
Unit
118 500
h
with an air flow of 0.5 m/s
Mechanical Data
Dimensions in mm. Tolerances ±0.3 mm, unless noted.
European
Projection
4 threads M3
JM032a
1
47.8
Bottom
view
TC Z
0.8 x 0.8
5.08
56.9
TC
63.5
0.8 x 0.8
5.08
1
JM031
Bottom
view
19
19
63.5
63.5
72.8
69.6
76.2
Fig. 13
Case IMX70/IMY70 (without opt. Z)
Material Zinc
Core
Components
1 s
1.5 2
Input to
(outputs+case)
110I MY70 1
3
Outputs to
case
all models 1
Between
outputs
all models
0.5
0.15 3
kVAC
kVDC
MΩ
Equivalent DC voltage
2.1
4.2
0.7
0.21 3
Insulation resistance
at 500 VDC
>100
>100
–
–
1
2
3
Unit
For open-frame models (option Z), only the insulation input to outputs is tested.
1.5 kVAC according to IEC 60950, sect. 6.2, Telecom equipment; type test with 1.5 kVAC / 60 s (IEE 802.3).
The test voltage between outputs is not applied as routine test.
Options
Option i: Inhibit (Negative Shutdown Logic)
The output of the converter may be enabled or disabled by
means of a logic signal (TTL, CMOS, etc.) applied to the inhibit
pin 8. No output voltage overshoot will occur, when the
converter is turned on. If the inhibit function is not required the
inhibit pin 8 should be connected to Vi– to enable the output
(active low logic, fail safe). Voltage on pin 8:
Converter operating:
–10 V to +0.8 V
Converter disabled:
2.4 V to 20 V
06138a
Option Z
4 Vi+
8 i
2 Vi –
Fig. 17
If the converters are mounted onto a mother board, in many
cases, a converter case is not required. Only converters with
option Z are not varnished, and this allows dipping of the
populated board including the converter into a protection
lacquer.
Note: The converters shall not be exposed to cleaning
processes, as this will damage the glue of the ferrite cores.
If the inhibit function is not used, the inhibit pin should be
connected to Vi–.
NUCLEAR AND MEDICAL APPLICATIONS - Power-One products are not designed, intended for use in, or authorized for use as critical
components in life support systems, equipment used in hazardous environments, or nuclear control systems without the express written
consent of the respective divisional president of Power-One, Inc.
TECHNICAL REVISIONS - The appearance of products, including safety agency certifications pictured on labels, may change depending on
the date manufactured. Specifications are subject to change without notice.
BCD.00002 Rev AH, 17-Aug-2015
MELCHER
The Power Partners.
Page 15 of 15
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