110IMY70-15-0TG - BEL POWER SOLUTIONS

IMX70, IMY70 Series Data Sheet

70 to 90 Watt DC-DC Converters

BCD.00002 Rev AH, 17-Aug-2015 Page 1 of 15

MELCHER

The Power Partners.

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 con-

verters 24IMX70 and 40IMX70 exhibit basic insulation for the

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 en-

vironments, 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.

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

• 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

• Thermal protection

• Planar technology for best stability

• Metallic case with 12.5 mm profile or open frame with

9.75 mm

76.2

63.5

2.5"

12.5

0.49"

72.7

2.86"

47.8

1.88"

9.75

0.38"

Safety-approved to IEC/EN 60950-1 and UL/CSA 60950-1

2nd Edition. CE mark for 110IMY70.

Table of Contents 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

IMX70, IMY70 Series Data Sheet

70 to 90 Watt DC-DC Converters

BCD.00002 Rev AH, 17-Aug-2015 Page 2 of 15

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Model Selection

Table 1: Model Selection

Output 1 Output 2 Input voltage Effic. ηη

ηη

η1Model Opt.

Vo nom Io nom Vo nom Io nom Vi min

2Vi cont Vi max2min. typ.

[V] [A] [V] [A] [V] [V] [V] [%] [%]

5.1 12 - - 12 15 to 33.6 40.1 24IMX70-05-0TG 3 i, Z

5.1 12 - - 21.6 25 to 72 75 40IMX70-05-0TG 3

5.1 12 - - 43.2 50 to 137.5 154 89.5 91 110IMY70-05-0TG

12 7.0 - - 12 15 to 33.6 40.1 91 93 24IMX70-12-0TG i, Z

12 7.5 - - 21.6 25 to 72 75 40IMX70-12-0TG 3

12 7 .5 - - 43.2 50 to 137.5 154 90 93 110IMY70-12-0TG

15 5.7 - - 12 15 to 33.6 40.1 91 92 24IMX70-15-0TG i, Z

15 6.0 - - 21.6 25 to 72 75 40IMX70-15-0TG 3

15 6 .0 - - 43.2 50 to 137.5 154 90 93 110IMY70-15--0TG

24 1.3 24 1.3 12 15 to 33.6 40.1 87 90 24IMX70-24-24-0G i, Z

24 1.3 24 1.3 21.6 25 to 72 75 40IMX70-24-24-0G 3

24 1.3 24 1.3 43.2 50 to 137.5 154 89 91 110IMY70-24-24-0G

1Efficiency at TA = 25 °C, Vi nom, Io nom

2Short time; see table 2 for details

3Contact the Company for lead times and availability.

Note: The sequence of options/features must follow the order above.

Part Number Description

Input voltage Vi

24 V battery ................................................ 24

36 V and 48 V battery ................................. 4 0

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 ........................... T1

Open frame ................................................. Z

Feature: RoHS-compliant for all 6 substances ......G2

1Standard feature for single-output models, not available for dual-output models

2G is standard and is placed at the end of the part number

Note: The sequence of options/features must follow the order above.

110 IMY70 - 24 - 24 -0 i Z G

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.

IMX70, IMY70 Series Data Sheet

70 to 90 Watt DC-DC Converters

BCD.00002 Rev AH, 17-Aug-2015 Page 3 of 15

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Vi–

Vi+

Primary

control circuit

Isolation

S+

Vo–

S–

Input

filter

JM027c

Ref

Opt. i

81 86

PUL n.c.

n.c.

Vi+

Vi–

Synchr. rect.

drive

Not connected

Connected for 24IMX models only

Vo+

Auxiliary

converter

350 kHz C

Secondary

control circuit

NTC

1 kΩ

Secondary

control circuit

Primary

control circuit

Isolation

Vo2+

Vo2–

Vo1+

Vo1–

Input

filter

JM026c

Ref

Opt. i

81 86

PUL W

n.c.

Not connected

Connected for 24IMX models only

Vi–

Vi+

Vi–

PTC

1 kΩ

Fig. 1

Block diagram of single-output models

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.

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.

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.

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 start-

up can be externally adjusted, which helps to limit the input

current at low input voltage.

Fig. 2

Block diagram of double-output models

IMX70, IMY70 Series Data Sheet

70 to 90 Watt DC-DC Converters

BCD.00002 Rev AH, 17-Aug-2015 Page 4 of 15

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Electrical Input Data

General conditions:

TA = 25°C, shutdown and R pin left open-circuit, unless specified.

Table 2: Input data

Input 24IMX70 40IMX70 Unit

Characteristics Conditions min typ max min typ max

ViOperating input voltage TA min to TA max, Io = 0 – Io nom 15 1 33.6 25 1 72 VDC

Vi nom Nominal input voltage 24 (36) 48

Vi 2s Temporary input voltage for 2 s, no shutdown 12 1 40.1 21.6 1 75

Vi sur Repetitive surge voltage shutdown, no damage 50 100

tstart up Converter Switch on Worst case condition at 500 ms

start-up time S

––

D high Vi min and full load 500

trise Rise time Vi = 0 → Vi nom, Io nom 25

Ii o No-load input current Io = 0, Vi min – Vi max 200 mA

Iirr Reflected ripple current Io = 0 – Io nom 30 mApp

Iinr p Inrush peak current Vi = Vi max 25 A

CiInput capacitance for surge calculation 24 µF

–D

– Shutdown voltage Converter disabled –0.7 to + 0.7 –0.7 to + 0.7 V

Converter operating 2 to 20 (or open-circuit) 2 to 20 (or open-circuit)

–D

– Shutdown pin current – 0.2 mA

Ii S

–D

– Input current at shutdown Vi min – Vi max 2

fsSwitching frequency Vi min – Vi max , Io = 0 – Io nom 200 2210 2200 kHz

Input 110IMY70 Unit

Characteristics Conditions min typ max

ViOperating input voltage TA min to TA max, Io = 0 – Io nom 50 137.5 VDC

Vi nom Nominal input voltage (72, 96,) 1 10

Vi 2s Temporary input voltage for 2 s, no shutdown 43.2 1 154

Vi sur Repetitive surge voltage shutdown, no damage 168

tstart up Converter Switch on Worst case condition at 250 500 ms

start-up time S

––

D high Vi min and full load 500

trise Rise time Vi = 0 → Vi nom, Io nom 25

Ii o No-load input current Io = 0, Vi min – Vi max 25 50 mA

Iirr Reflected ripple current Io = 0 – Io nom 200 mApp

Iinr p Inrush peak current Vi = Vi max 35 A

CiInput capacitance for surge calculation 7.7 µF

–D

– Shutdown voltage Converter disabled –0.7 to + 0.7 V

Converter operating 2 to 20 (or open-circuit)

–D

– Shutdown pin current –0.2 mA

Ii S

–D

– Input current at shutdown Vi min – Vi max 2

fsSwitching frequency Vi min – Vi max, Io = 0 – Io nom 200 2210 2kHz

1Vi 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.

2typ. 240 kHz for single-output models, typ. 300 kHz for models with 5 V output

IMX70, IMY70 Series Data Sheet

70 to 90 Watt DC-DC Converters

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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.

Table 3: Recommended external fuses in the non-earthed

input line

Converter model Fuse type Rating

24IMX70 single-output Littlefuse 166 10 A, 80 V

24IMX70 double-output Littlefuse 166 10 A, 80 V

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

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.

Fig. 3

Inrush current at Vi nom, Po nom versus time (110IMY70-24-24-

8). Source impedance according to ETS 300132-2: L = 10

µH, R = 1.5

Ω

Fig. 4

Converter start-up and rise time

Fig. 5

Example for external circuitry to comply with IEC/EN 61000-

4-5; see table 10

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 Inductor (L) Capacitor (C)

24IMX70 -- 330 µF / 100 V

40IMX70

110 IMY70 -- 150 µ F / 200 V

Input Transients Protection

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

Model Breakdown Peak power Peak pulse

voltage at 1 ms current

VBr nom [V] Pp [kW] Ipp [A]

24IMX70 56 1.5 19.4

40IMX70

110IMY70 176 0.6 2.5

o nom

startup

rise

04008b

JM028

020 40 60 µs

Vi+

Vi–

JM029

IMX70, IMY70 Series Data Sheet

70 to 90 Watt DC-DC Converters

BCD.00002 Rev AH, 17-Aug-2015 Page 6 of 15

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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 12 V Unit

Characteristics Conditions m i n typ m a x min typ m ax

VoOutput voltage Vi nom, 0.5 Io nom 5.07 5.1 5.13 11.94 12.0 12.06 V

Io nom Output current 24IMX Vi min – Vi max 12 7.0 A

40IMX 12 7.5

110IMY 12 7.5

IoL Current limit 1 24IMX Vi nom, TC = 2 5 °C 7.5 8.0 8.5

40IMX Vo = 93% Vo nom

110IMY 13.6 13.9 14.4 8.5 8.8 9.2

∆VoLine/load regulation Vi min – Vi max, ±0.5 ±0.5 %

(0.1 – 1) Io nom

Vo noise Output voltage noise Vi min – Vi max 2 100 150 mVpp

Io = Io nom 3 50 80

Vo OS Output overshot at turn-on Vi min – Vi max 0.1 0.24 V

Vo L Output overvoltage limit Min. load 1% 6.0 7.0 13.5 1 5

Co ext Capacitive load unlimited unlimited µF

Vo d Dynamic Voltage deviat. Vi nom ±10004±18005mV

tdload Recovery time (0 ↔ 0.5) Io nom or 22ms

regulation (0.1 ↔ 0.6) Io nom

αVo Temperature coefficient Vi min – Vi max ±0.02 ±0.02 %/K

∆Vo/∆TCIo = (0.1 to 1) Io nom

1Rectangular characteristic Vo/Io

2BW = 20 MHz, measured with an external capacitor of 1 µF across each pair of output pins.

3Measured with a probe according to EN 61204

4With an output cap Co = 2200 µF: ±250 mV

5With an output cap Co = 1500 µF: ±600 mV

IMX70, IMY70 Series Data Sheet

70 to 90 Watt DC-DC Converters

BCD.00002 Rev AH, 17-Aug-2015 Page 7 of 15

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Table 7: Output data for single- and double-output models; general condition as per table 6.

Output 15 V 2 ××

××

× 24 V Unit

Characteristics Conditions m in typ m a x m in typ max

VoOutput voltage Vi nom, 0.5 Io nom 14.93 15.0 15.08 23.88 24.0 24.12 V

Io nom Output current 24IMX Vi min – Vi max 5.7 2 × ×

× ×

× 1.3 A

40IMX 6.0 2 × ×

× ×

× 1.3

110IMY 6.0 2 × ×

× ×

× 1.3

IoL Current limit 1 24IMX Vi nom, TC = 25 °C 6.2 7.0 3.0 3.15 3.3

40IMX Vo = 93% Vo nom 3.0 3.15 3.3

110IMY 6.6 7.5 3.0 3.15 3.3

∆VoLine/load regulation Vi min – Vi max, ±0.5 ±0.5 %

(0.1 – 1) Io nom

Vo noise Output voltage noise Vi min – Vi max 2 150 200 mVpp

Io = Io nom 3 100 150

Vo OS Output overshot at turn-on Vi min – Vi max 0.3 0.48 V

Vo L Output overvoltage limit Min. load 1% 16.8 18 4

Co ext Admissible capacitive load unlimited 0 1500 6 7 µF

Vo d Dynamic Voltage deviat. Vi nom ±1500 5 ±1500 mV

tdload Recovery time Io nom ↔1/2 Io nom 2 1ms

regulation

αVo Temperature coefficient Vi min – Vi max ±0.0 2 ±0.02 %/K

∆Vo/∆TCIo = (0.1 to 1) Io nom

1The 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).

2BW = 20 MHz, measured with an external capacitor of 1 µF across each output pins.

3Measured with a probe according to EN 61204

4Both outputs of double-output models are protected by a suppressor diode.

5With an output cap Co = 1500 µF: ±750 mV

6Both outputs of double-output models connected in parallel. For series connection, only 1/4 of the capacitance is possible.

71000 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.

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.

The installer must ensure that under all operating conditions TC

(TC Z) remain within the limits stated in the table Temperature

specifications.

1.0

0.8

0.6

0.4

0.2

40 60 80

100 °C

/ I

o nom

JM036b

natural cooling

1 m/s

200 LFM

0.5 m/s

100 LFM

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).

IMX70, IMY70 Series Data Sheet

70 to 90 Watt DC-DC Converters

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Overtemperature Protection

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.

Short Circuit Behavior

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.

Fig. 6b

Maximum allowed output power versus ambient temperature

for 24IMX70-24-24-0Z and 110IMY70-24-24-0Z (with rev. AB

or greater).

1.0

0.8

0.6

0.4

0.2

40 60 80

100 °C

Io / Io nom

JM039b

natural cooling

1 m/s

200 LFM

0.5 m/s

100 LFM

Fig. 6c

Max.allowed output power versus ambient temperature for

converters 110IMY70-12 without opt. Z in vertical position.

1.0

0.8

0.6

0.4

0.2

40 60 80

100 °C

/ I

o nom

JM118

natural cooling

Fig. 6d

Max. allowed output power versus ambient temperature for

converters 110IMY70-12-0Z in vertical position.

1.0

0.8

0.6

0.4

0.2

40 60 80

100 °C

Io / Io nom

JM099b

natural cooling

Fig. 7

Rectangular current limitation of single-output models

Vo nom

0.98

0.5

0.5 1.0 IoL

Io no

JM097

Fig. 8

Current limitation of double-output models with both outputs

connected in parallel

100

[%]

05041c

0.3 s

overload condition

switch-off

Connection in Series

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.

IMX70, IMY70 Series Data Sheet

70 to 90 Watt DC-DC Converters

BCD.00002 Rev AH, 17-Aug-2015 Page 9 of 15

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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.

Cross Regulation of Double-Output Models

See fig. 9. General conditions:

– TA = 25°C, unless TC is specified.

– Shut down and R pin left open-circuit.

Fig. 9

Cross regulation of double-output models (typ.)

Vo2 versus Io2, Io1 = 0.5 Io1 nom

0.85

0.9

0.95

1.0

1.05

1.1

Vo / Vo nom

0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 Io / Io nom

JM030a

Vo2

Vo1

Fig. 10a

Efficiency versus input voltage and load. Typical values

(24IMX70-24-24)

Fig. 10c

Efficiency versus input voltage and load. Typical values

(110IMY70-12)

0.4 0.8 I

/ I

o no

JM096

Vi = 24 V

100

η [%]

0.6

0.2

Vi = 33.6 V

Vi = 15 V

Fig. 10d

Efficiency versus input voltage and load. Typical values

(110IMY70-24-24)

JM098

Vi = 110 V

100

η [%]

Vi = 137 V

Vi = 50 V

/ I

o no

0.4 0.8 I

/ I

o no

JM040a

Vi = 110 V

100

η [%]

0.6

0.2

Vi = 150 V

Vi = 50 V

Efficiency

Fig. 10b

Efficiency versus input voltage and load. Typical values

(110IMY70-05)

JM163

100

η [%]

Vi = 137 V

Vi = 50 V

Io / Io no

Vi = 110 V

IMX70, IMY70 Series Data Sheet

70 to 90 Watt DC-DC Converters

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Auxiliary Functions

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.

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.

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)

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 Vo nom. Single-

output models can be trimmed to Vo ≈ 0 V.

Vo • 2.5 V

Vext ≈ ––––––––

Vo nom

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.

Reference Output (Ref)

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.

Note: It is recommended to connect a filter capacitor (0.1 µF)

between Ref and Vi–, if Ref is used.

Current Sharing (T)

This feature is available for single-output models. Several

parallel connected converters will share their current evenly by

interconnecting the T pins (pin 11).

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).

Sense Lines

The sense inputs of single-output models allow for compensat-

ing 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 (S

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: 2.0 to 20 V

Converter disabled: –0.7 to +0.7 V

Progr. Input Voltage Lockout PUL

A special feature of these converters is the adjustable under-

voltage lockout function, protecting the converter (and system)

from high currents caused by operation at too low input volt-

age. This ensures easier start-up in distributed power systems.

The undervoltage lockout level can be programmed by an

external resistor RPUL (between PUL and Vi–) to increase the

preset levels, as indicated in the table below (with hysteresis).

The overvoltage lockout (OVL) cannot be varied.

Vo+

Vo–

–

4 kΩ

ref

= 2.5 V

Control

logic R

ext1

ext2

06029e

Vi–

Vi+

Table 9: Typical values for RPUL and the respective turn-on

input voltage Vi LO.

24IMX70 RPUL [kΩΩ

ΩΩ

Ω] 40IMX70 RPUL [kΩΩ

ΩΩ

Ω]

ViLO [V] single-op. double-op. Vi LO [ V ] single-op. double-op.

14 ∞∞24 ∞∞

16 40.5 120

18 19.8 62

20 12.8 41

110IMY70 RPUL [kΩΩ

ΩΩ

Ω]RPUL [kΩΩ

ΩΩ

Ω]

Vi LO [V] single-output double-output

46 ∞∞

50 68 270

57 25.5 110

61 18 82

Table 8: Turn-on and shutdown voltage (pin 1 left open)

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

IMX70, IMY70 Series Data Sheet

70 to 90 Watt DC-DC Converters

BCD.00002 Rev AH, 17-Aug-2015 Page 11 of 15

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dbµV

0.2 0.5 1 2 5 10 20 MHz

EN 55022 A qp

JM037

EN 55022 A avr

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).

Electromagnetic Emissions

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.

Electromagnetic Immunity

Table 10: Immunity type tests

Phenomenon Standard Class Coupling Value Waveform Source Test In Perf- 2

Level mode 1 applied imped. procedure oper. crit.

Electrostatic IEC/EN contact discharge ±6000 Vp1/50 ns 330 Ω10 positive and ye s B

discharge 61000-4-2 3 (R pin open) 10 negative

to case 3 air discharge ±8000 Vpdischarges

(R pin open)

Electromagnetic IEC/EN x 4antenna 20 V/m 80% AM, 1 kHz n.a. 80 – 1000 MHz y es A

field 61000-4-3 5antenna 20 V/m 80% AM, 1 kHz n.a. 800 – 1000 MHz yes A

10 V/m 1400 – 2100 MHz

5 V/m 2100 – 2500 MHz

Electrical fast IEC/EN 36 direct coupl. (fig. 9) ±2000 Vp6bursts of 5/50 ns 50 Ω60 s positive y es A

transients/burst 61000-4-4: 4+i/c,

–

i/c,+i/

–

i±4000 Vp5 kHz over 15 ms 60 s negative yes B

2004 burst period: 300 transients per

3 capacit. (fig. 10), o/c ±2000 Vpms coupling mode yes B

Surges IEC/EN 37+i/c, –i/c ±2000 Vp31.2/50 µs 12 Ω5 pos. and 5 neg. ye s B

61000-4-5 surges per

2 7+i/–i ±1000 Vp32 Ωcoupling mode

Conducted IEC/EN 38i, o, signal wires 10 VAC AM 80% 150 Ω0.15 – 80 MHz yes A

disturbances 61000-4-6 ( 140 dB µ V) 1 kH z

1i = input, o = output, c = case (not for option Z)

2A = normal operation, no deviation from specification, B = temporary deviation from specs. possible.

3Corresponds to EN 50121-3-2:2006, table 9.3

4Corresponds to EN 50121-3-2:2006 table 9.1 and exceeds EN 50121-4:2006 table 1.1.

5Corresponds to EN 50121-3-2:2006 table 9.2 and EN 50121-4:2006 table 1.2 (compliance with digital mobile phones).

6Corresponds to EN 50121-3-2:2006 table 7.2 and EN 50121-4:2006 table 2.2.

7Measured with an external input capacitor specified in table 5

8Corresponds to EN 50121-3-2:2006 table 7.1 and EN 50121-4:2006 table 2.2.

typically occur in many installations, but especially in battery-

driven mobile applications.

Electromagnetic Compatibility (EMC)

A suppressor diode together with an input filter form an

effective protection against high input transient voltages which

IMX70, IMY70 Series Data Sheet

70 to 90 Watt DC-DC Converters

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Immunity to Environmental Conditions

Table 11: Mechanical and climatic stress

Test method Standard Test conditions Status

C b Damp heat IEC/EN 60068-2-56 Temperature: 25 °C Converter

steady state Relative humidity: 95 % operating

Duration: 8 h

Cab Damp heat IEC/EN 60068-2-78 T emperature: 40 ±2 °C Converter

steady state MIL-STD-810D section 507.2 Relative humidity: 93 +2/-3 % not

Duration: 56 days operating

Db Damp heat test, EN 50155:2007, clause 12.2.5 Temperature: 55 °C and 25 °C Converter

cyclic IEC/EN 60068-2-30 Cycles (respiration effect): 2 not

Duration: 2× 24 h operating

Bd Dry heat test EN 50155:2007, clause 12.2.4 Temperature: 70 °C Converter

steady state IEC/EN 60068-2-2 Duration: 6 h operating

Ad Cooling test EN 50155:2007, clause 12.2.3 Temperature, duration – 40 °C, 2 h Conv. not

steady state IEC/EN 60068-2-1 Performance test +25 °C operating

-- Salt mist test EN 50155:2007 Temperature: 35±2 °C Converter

sodium chloride clause 12.2.10 Duration: 16 h n ot

(NaCl) solution 2class ST2 2operating

Fc Vibration IEC/EN 60068-2-6 Acceleration amplitude: 0.35 mm (10 – 60 Hz) Converter

(sinusoidal) MIL-STD-810D section 514.3 5 g n = 49 m/s2 (60 - 2000 Hz) operating

Frequency (1 Oct/ min): 10 – 2000 Hz

Test duration: 7.5 h (2.5 h in each axis)

Fh Random vibration IEC/EN 60068-2-64 Acceleration spectral density: 0.05 g n2/Hz Converter

broad-band Frequency band: 8 – 500 Hz operating

(digital control) and Acceleration magnitude: 4.9 grms

guidance Test duration: 1.5 h (0.5 h in each axis)

Eb Bump IEC/EN 60068-2-29 Acceleration amplitude: 25 gn = 245 m/s2Converter

(half-sinusoidal) MIL-STD-810D section 516.3 Bump duration: 6 ms operating

Number of bumps: 6000 (1000 in each direction)

Ea Shock IEC/EN 60068-2-27 Acceleration amplitude: 50 gn = 490 m/s2Converter

(half-sinusoidal) MIL-STD-810D section 516.3 Bump duration: 1 1 ms operating

Number of bumps: 18 (3 in each direction)

-- Shock EN 50155:2007 clause 12.2.11, Acceleration amplitude: 5.1 gnConverter

EN 61373 sect. 10, Bump duration: 30 ms operating

class B, body mounted1Number of bumps: 18 (3 in each direction)

-- Simulated long life EN 50155:2007 clause 12.2.11, Acceleration spectral density: 0.02 g n2 / Hz Converter

testing at EN 61373 sect. 8 and 9, Frequency band: 5 – 150 Hz operating

increased random class B, body mounted1Acceleration magnitude: 0.8 gn rms

vibration levels Test duration: 15 h (5 h in each axis)

1Body mounted = chassis of a railway coach

2Models with option Z have been covered by lacquer (Peters SL1301) to simulate the end-use situation.

IMX70, IMY70 Series Data Sheet

70 to 90 Watt DC-DC Converters

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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

TAAmbient temperature In operation 1 –40 100 1°C

TCCase temperature (without opt. Z) 2–40 105 2

TC Z Component temp. with opt. Z 2–40 115 2

TSStorage temperature Not operational – 55 105

1See Thermal Considerations

2Temperature measurement point; see Mechanical Data

Reliability

Table 13: Calculated MTBF at nominal load

Model Ground benign Ground fixed Ground mobile Device hours Unit

40 °C 40 °C 70 °C 150 °C

24IMX70-24-24 (Bellcore Telc. SR-332) 1 022 000 510 000 162 500 118 500 h

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

110 IMY70-24-24 (Bellcore Telc. SR-332) 1 000 000 632 000 163 000 117 400

1with an air flow of 0.5 m /s

Mechanical Data

Dimensions in mm. Tolerances ±0.3 mm, unless noted.

Fig. 13

Case IMX70/IMY70 (without opt. Z)

Material Zinc

Weight: approx. 140 g

European

Projection

Fig. 14

IMX70/IMY70 open frame (option Z)

Weight: approx. 70 g

63.5

76.2

63.5

0.8 x 0.8

5.08

12.5

JM032a

69.6

56.9

4 threads M3

Bottom

view

≥3.66

5.08

47.8

63.5

72.8

8.9

0.8 x 0.8

JM031

C Z

Core

C Z

Bottom

view

Components

≥5

<9.75

Core

IMX70, IMY70 Series Data Sheet

70 to 90 Watt DC-DC Converters

BCD.00002 Rev AH, 17-Aug-2015 Page 14 of 15

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09122b

Bottom

view

4 treads M3

Table 14: Pin allocation

Pin no. Single-output Double-output

1 PUL PUL

2Vi– Vi–

3 n.c. / Vi– 1 n.c. / Vi– 1

4Vi+ Vi+

5 n.c. / Vi+ 1 n.c. / Vi+ 1

6 W (Sync.) W (Sync.)

7 Ref Ref

8 S D / i 2 SD / i 2

11 T n.c.

12 n.c. n.c.

13 S+ Vo2+

14 Vo– Vo2–

15 Vo– Vo1–

16 Vo+ Vo1+

17 Vo+ n.c.

18 S– n.c.

19 R (adjust) R (adjust)

1Only connected at 24IMX models, n.c. for 40IMX and 110IMY

2i if option i (inhibit) is fitted

Safety and Inst allation Instructions

Pin allocation

Fig. 15

Footprint. The holes in the PCB should have a diameter of

1.5 mm.

Installation Instructions

Installation of the converters must strictly follow the national

safety regulations in compliance with the enclosure,

mounting, creepage, clearance, casualty, markings, and

segregation requirements of the end-use application.

Connection to the system shall be made via a printed circuit

board with hole diameters of 1.5 mm for the pins. Connect both

input pins for 24IMX70 models.

The converters should be connected to a secondary circuit.

Ensure that a converter failure (e.g. by an internal short-circuit)

does not result in a hazardous condition.

case

screw M3 lock washe

PCB

earthed copper area

JM043

Standards and Approvals

The converters are safety agency approved to the standards

IEC/EN 60950 and UL/CSA 60950-1 2nd Edition.

The converters have been evaluated for:

• Building-in

• Basic insulation input to output for 24IMX70 and 40IMX70

models, based on the maximum input voltage;

• Reinforced insulation input to output for 110IMY70

models, basic insulation to the case, based on the input

voltage of 150 V. The case can be reliably connected to PE

(protective earth) – except option Z; see fig. 15.

• Pollution degree 2

• Connecting the input to a secondary circuit, which is

subject to a maximum transient rating of 1500 V.

The converters are subject to manufacturing surveillance in

accordance with the above mentioned standards.

CB scheme is available.

Input Fuse

To prevent excessive current flowing through the input supply

lines in case of a short-circuit in the converter, an external fuse

should be installed in the non-earthed input line; see table 3.

Railway Applications

To comply with Railway standards, all components are

coated with a protective lacquer (except option Z).

Protection Degree and Cleaning Liquids

The protection degree is IP 40 (except option Z).

In order to avoid possible damage, any penetration of

cleaning fluids should be prevented, since the converters are

not hermetically sealed.

However, open-frame models (option Z) leave the factory

unlacquered; they can be lacquered by the customer, for

instance together with the mother board. Cleaning liquids are

not permitted – except washing at room temperature with

isopropyl alcohol and de-ionized /destilled water (1 : 1).

The mother board can also be cleaned, before fitting the open-

frame converter.

Note: Other cleaning liquids can damage the adhesive joints of the

ferrite cores.

Fig. 16

Reliable connection of the metallic case to protection earth

(110IMY70 models). Use at least 2 screws!

IMX70, IMY70 Series Data Sheet

70 to 90 Watt DC-DC Converters

BCD.00002 Rev AH, 17-Aug-2015 Page 15 of 15

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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.

Table 15: Electric strength test voltages

Characteristic Input to Input to Outputs to Between Unit

(outputs+case) (outputs+case) case outputs

20/40IMX70 1110IMY70 1all models 1all models

Factory test >1 s 1.5 23 0.5 0.15 3kVAC

Equivalent DC voltage 2.1 4.2 0.7 0.21 3kVDC

Insulation resistance >100 >100 – – MΩ

at 500 VDC

1For open-frame models (option Z), only the insulation input to outputs is tested.

21.5 kVAC according to IEC 60950, sect. 6.2, Telecom equipment; type test with 1.5 kVAC / 60 s (IEE 802.3).

3The 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

Fig. 17

If the inhibit function is not used, the inhibit pin should be

connected to Vi–.

Vi+

Vi–

06138a

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

Option Z

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.

Isolation

The electric strength test is performed in the factory as a

routine test in accordance with EN 50116, IEC/EN 60950-1,

and UL/CSA 60950-1. The Company will not honor any

warranty claims resulting from incorrectly executed electric

strength field tests.