DATA-JANS1N5819UR-1 - MICROSEMI

IMX4 Series Data Sheet

4 W att DC-DC Converters

BCD20006-G Rev AE, 16- Sep-2015 Page 1 of 12

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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 trans-

port, industry, or telecom, where variable input volt ages or high

transient voltages are prevalent.

Covering a total input voltage range from 8.4 VDC up to

121 VDC with three different models, the converters are

available with single or dual output from 3.3 up to ±24 VDC

with flexible load distribution. 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 and 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

60950-1 2nd Ed. 70IMX4 models are 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

connection. Thanks to the rigid mechanical design, the

converters withstand an extremely high level of shock and

vibrations. Careful consideration 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, such as open-frame or an alternative industrial

pinout, provide a high level of application-specific engineering

and design-in flexibility.

1.25"

0.8"

8.5

0.34

Description .............................................................................1

Model Selection .....................................................................2

Functional Description ...........................................................3

Electrical Input Data...............................................................4

Electrical Output Data ............................................................6

Electromagnetic Compatibility (EMC) ....................................8

Mechanical Data ....................................................................9

Immunity to Environmental Conditions ................................10

Safety and Installation Instructions......................................1 0

Description of Options ......................................................... 11

Table of Contents Page Page

Features

•RoHS lead-free-solder and lead-solder-exempted

products are available.

•Input voltage ranges up to 121 VDC

•Voltage withstand test 1500 VAC

•1 or 2 isolated outputs up to 48 V

•Extremely wide input voltage ranges

•Immunity according to IEC/EN 61000 -4-2, -3, -4, -5, -6

•High efficiency (typ. 83%)

• Flexible load distribution on outputs

•Outputs no-load, overload, and short-circuit proof

•High reliability

•Operating ambient temperature –40 to +85 °C

•Thermal protection

•Industrial and alternative pinout

• DIL 24 case with 8.5 mm profile

2 70IMX4 models

Safety-approved to IEC 60950-1 2nd Ed and CSA/UL

60950-1 2nd Ed.

IMX4 Series Data Sheet

4 W att DC-DC Converters

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Model Selection

Table 1: Model Selection

Output 1 Output 2 Output power Input volta ge Efficiency Model Options

Vo1 nom Io1 nom Vo2 nom Io2 nom Po nom range ηη

ηη

ηmin ηη

ηη

ηtyp

[VDC] [mA] 1 [VDC] [mA] 1 [W] [VDC] [%] [%]

3.3 900 - - 3.0 8.4 to 36 76 77.5 20IMX4-03-8 Z, G

3.3 900 - - 3.0 16.8 to 75 76 78 40IMX4-03-8 Z, G

5 700 - - 3.5 4.7 to 16.8 76 - 5IMX4-05-8 Z, G

5 700 - - 3.5 8.4 to 36 78 81 20IMX4-05-8 K, Z, G

5 700 - - 3.5 16.8 to 75 78 81 40IMX4-05-8 K, Z, G

5 700 - - 3.5 40 to 121 77 78 70IMX4-05-8 G

12 300 - - 3.6 4.7 to 16.8 79 - 5IMX4-12-8 Z, G

12 340 - - 4.1 8.4 to 36 78 82 20IMX4-12-8 K, Z, G

12 340 - - 4.1 16.8 to 75 78 82 40IMX4-12-8 K, Z, G

12 340 - - 4.1 40 to 121 77 82 70IMX4-12-8 G

15 250 - - 3.75 4.7 to 16.8 79 - 5IMX4-15-8 Z, G

15 280 - - 4.2 8.4 to 36 78 82 20IMX4-15-8 K, Z, G

15 280 - - 4.2 16.8 to 75 78.7 82 40IMX4-15-8 K, Z, G

15 280 - - 4.2 40 to 121 79 80.5 70IMX4-15-8 G

+5 350 –5 350 3.5 8.4 to 36 77 81 20IMX4-0505-8 K, Z, G

+5 350 –5 350 3.5 16.8 to 75 76 81 40IMX4-0505-8 K, Z, G

+5 350 –5 350 3.5 40 to 121 75.5 78 70IMX4-0505-8 G

+12 170 –12 170 4.1 8.4 to 36 76 82 20IMX4-1212-8 K, Z, G

+12 170 –12 170 4.1 16.8 to 75 76 82 40IMX4-1212-8 K, Z, G

+15 140 –15 140 4.2 8.4 to 36 78 82 20IMX4-1515-8 K, Z, G

+15 140 –15 140 4.2 16.8 to 75 76 82 40IMX4-1515-8 K, Z, G

+24 80 –24 80 3.8 8.4 to 36 76 83 20IMX4-2424-8 Z, G

+24 80 –24 80 3.8 16.8 to 75 76 83 40IMX4-2424-8 Z, G

1Flexible load distribution on double-outputs is possible.

Preferred for new designs.

Part Number Description

Input voltage range Vi20 IMX4 - 05 05 -8 K Z G

4.7 to 16.8 VDC ........................................... 5

8.4 to 36 VDC ............................................ 20

16.8 to 75 VDC .......................................... 40

40 to 121 VDC ........................................... 70

Series.........................................................................IMX4

Output voltage of output 1...................... 03, 05, 12, 15, 24

Output voltage of output 2............................ 05, 12, 15, 24

Operating ambient temperature range –40 to 85 °C ...... -8

Options: Alternative pinout.........................................K

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

RoHS compliant for all six substances......... G

Note: The sequence of options must follow the order above. This part number description is descriptive only; it is not inteded for

creating part numbers.

Example: 40IMX4-0505-8KG: 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, RoHS-compliant for all si x substances

IMX4 Series Data Sheet

4 W att DC-DC Converters

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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 (Io nom for single- and the sum

Io1 nom + Io2 nom for 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.

Fig. 2

Block diagram for dual-output models with standard

pinout.

PWM

Vi+

Vi–

Vo+

Vo–

03045

PWM

Vi+

Vi–

Vo+

Vo–

03047

Fig. 4

Block diagram for dual-output models with alternative

pinout (option K).

Fig. 3

Block diagram for single-output models with alternative

pinout (option K).

Fig. 1

Block diagram for single-output models with standard

pinout.

PWM

Vi+

Vi–

Vo+

Vo–

03044

PWM

Vi+

Vi–

Vo+

Vo–

03046

n.c.

IMX4 Series Data Sheet

4 W att DC-DC Converters

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Table 3: Input electrolytic capacitors

Model 20IMX4 40IMX4 70IMX4

Ci100 µF 47 µF 330 µF

50 V 100 V 200 V

Electrical Input Data

General conditions: TA = 25 °C, unless TC is specified.

Table 2: Input Data

Input 5IMX4 20IMX4 40IMX4 70IMX4 Unit

Characteristics Conditions min typ max min typ max min typ max min typ max

ViInput voltage range TC min to TC max 4.7 5.0 16.8 8.4 36 16.8 2 75 40 121 VDC

Vi nom Nominal input voltage Io = 0 to Io nom 5.0 20 40 70

Vi sur Repetitive surge voltage abs. max input (3 s) -- 40 100 150

tstart-up Converter start-up time

1 Worst case condition at 0.25 0.5 0.25 0.5 0.25 0.5 0.3 0.6 s

Vi min and full load

trise Rise time 1 Vi nom resistive load -- 5 5 5 ms

Io nom capacitive load -- 12 12 12

Ii o No-load input current Io = 0, Vi min to Vi max -- 15 20 5 10 5 10 mA

CiInput capacitance -- 0.54 0.3 0.15 µF

Iinr p Inrush peak current Vi = Vi nom 3 3.8 3.7 4.2 5.6 A

fsSwitching frequency Vi min to Vi max, Io = 0 to Io nom 400 400 400 400 kHz

Ii rr Reflected ripple current Io = 0 to Io nom -- 100 60 30 mApp

vi RFI Input RFI level EN 55011/55022 4 -- A A A Class

conducted

1Measured with a resistive or max. admissible capacitive load; see fig. 5

2Operation at lower input voltage possible: Po approx. 80% of Po nom at Vi min = 14.4 V

3Source impedance according to ETS 300132-2, version 4.3.

4External capacitors required according to table 3.

Fig. 5

Converter start-up and rise time

Inrush Current

The inrush current has been kept as low as possible by

choosing a very small input capacitance. A series resistor may

be inserted in the input line to further limit this current.

Fig. 6

Typ. inrush current at Vi nom, Po nom versus time measured

according to ETS 300132-2, version 4.3 (40IMX4).

Fig. 7

Input capacitors

0 10 20 30 40 µ

04034a

Start-up 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).

Vi+

Vi–

04035b

o nom

startup

rise

04008b

IMX4 Series Data Sheet

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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.

In order to protect the converter, a transient voltage sup-

pressor diode is fitted at the input; see table below.

Table 4: Built-in transient voltage suppressor

Model Breakdown Peak power Peak pulse

voltage at 1 ms current

VBR nom PP IPP

5IMX4 -- -- --

20IMX4 40 V 600 W 10.3 A

40IMX4 100 V 600 W 4.1 A

70IMX4 150 V 600 W 2.9 A

Fig. 8

External circuitry to comply with

IEC/EN 61000-4-5, level 2.

Vi+

Vi–

04036b

If transients generating currents above the peak pulse current

IPP 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 comp

onents are specified in table 5.

If 40IMX4 converters should withstand 150 V transients

according to 19Pfl1, the same external circuitry with similar

components as shown in figure 8 can be used.

Fuse and Reverse Polarity Protection

The suppressor diode on the input also protects against

reverse polarity input voltage. An external fast fuse is required

to limit this reverse current; see table below.

Table 6: External input fuse

Model Fuse type

5IMX4 Fast 1.6 A

20IMX4 Fast 1 A

40IMX4 Fast 0.5 A

70IMX4 Fast 0.315 A

Table 5: Components for the circuitry fig. 8

Model 20IMX4 40IMX4 70IMX4

Li330 µH, 0.42 W 330 µH, 0.42 W 330 µH, 0.65 W

1 A 0.6 A 0.3 A

Ci68 µF, 50 V 68 µF, 100 V 100 µF, 200 V

D ON 1.5KE 39 A ON 1.5KE 82 A –

IMX4 Series Data Sheet

4 W att DC-DC Converters

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Electrical Output Data

General conditions: TA = 25 °C, unless TC is specified.

Table 7a: Output data for single-output models

Output Vo nom 3.3 V 5 V 12 V 15 V Unit

Characteristics Conditions min typ max min typ max min typ max min typ max

VoOutput setting voltage Vi nom, Io = 0.5 Io nom 3.27 3.33 4.96 5.04 11.90 12.10 14.88 15.12 V

Io nom Output current (nom.) Vi min to Vi max 5IMX4 -- 700 300 250 mA

others 900 700 340 280

Io L Current limit 2Vi nom 5IMX4 950 1000 375 325

others 1260 1800 955 1400 476 680 392 560

∆Vo V Line regulation Vi min to Vi max, Io nom ±1 ±1 ±1 ±1 %

∆VLoad regulation Vi nom ±3.5 ±3 ±3 ±3

Io = (0.1 to 1) Io nom

voOutput voltage noise Vi min to Vi max 5 80 80 120 150 mVpp

Io = Io nom 6 20 40 20 40 40 60 50 75

Vo clp Output overvoltage Min. load 1% 130 130 130 130 %

limitation

Co ext Admissible capacitive load 0 680 0 680 0 150 0 100 µF

vo d Dynamic Voltage deviat. Vi nom ±250 ±250 ±250 ±250 mV

tdload Recovery time

= (1 to 0.5) I

o nom

1111ms

regulat.

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

∆Vo/∆TCIo = (0.1 to 1) Io nom

Table 7b: Output data for dual-output models

Output Vo nom ±5 V ±12 V ±15 V ±24 V Unit

Characteristics Conditions min typ max min typ max min typ max min typ max

Vo1 Output setting voltage Vi nom 4.96 5.04 11.90 12.10 14.88 15.12 23.81 24.19 V

Vo2 Io1 = Io2 = 0.5 Io nom 4.95 5.05 11.88 12.12 14.85 15.15 23.75 24.25

Io nom Output current (nom.) 1 Vi min to Vi max 2 x 350 2 x 170 2 x 140 2 x 80 mA

Io L Current limit 2 3 Vi nom, TC = 25 °C 1000 474 392 232

∆Vo V Line regulation Vi min to Vi max, Io nom ±1 ±1 ±1 ±1 %

∆VLoad regulation 4 Vi nom ±3 ±3.5 ±3 ±3

Io = (0.1 to 1) Io nom

vo1, 2 Output voltage noise Vi min to Vi max 5 100 140 150 240 mVpp

Io = Io nom 6 40 60 45 70 50 75 40 120

Vo clp Output overvoltage Min. load 1% 130 130 130 130 %

limitation

Co ext Admissible capacitive load 3 0 680 0 150 0 100 0 47 µF

vo d Dynamic Voltage deviat. Vi nom ±250 ±600 ±750 ±750 mV

tdload Recovery time

= (1 to 0.5) I

o nom

1 111ms

regulat.

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

∆Vo/∆TCIo = (0.1 to 1) Io nom

1Each output is capable of delivering full output power.

2The current limit is primary side controlled.

3Sum of both outputs

4Conditions for specified output. Other output loaded with constant current Io = 0.5 Io nom.

5BW = 20 MHz

6Measured with a probe according to EN 61204

IMX4 Series Data Sheet

4 W att DC-DC Converters

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Thermal Considerations

If a converter, mounted on a PCB, is located in free, quasi-

stationary air (convection cooling) at the maximum ambient

temperature TA max (see table Temperature specifications)

and is operated at nominal input voltage and output power,

the case temperature TC measured at the measuring point of

case temperature TC (see Mechanical Data) will approach the

indicated value TC max after the warm-up phase. However, the

relationship between TA and TC depends heavily on the

conditions of operation and integration into a system. The

thermal conditions depend on input voltage, output current,

airflow, temperature of surrounding components and surfaces

and the properties of the printed circuit board. TA max is

therefore only an indicative value, and under practical

operating conditions, the ambient temperature TA may be

higher or lower.

Caution: The case temperature TC measured at the measuring

point of case temperature TC (see Mechanical Dat a) may under no

circumstances exceed the specified maximum. The installer must

ensure that under all operating conditions TC remains within the

limits stated in the table Temperature Specifications.

Short Circuit Behavior

The current limitation shuts down the converter, when a short

circuit is applied to the output. It acts self-protecting, and

automatically recovers after removal of the overload condition.

Output Overvoltage Protection

The outputs are protected against overvoltages by Zener

diodes. In the event of an overvoltage, the converter will shut-

down and attempt to restart automatically. The main purpose

of this feature is to protect against possible overvoltages,

which could occur due to a failure in the feedback control

circuit. The converters are not designed to withstand external

overvoltages applied to the outputs.

Connection in Series

The outputs of single or dual-output models can be connected

in series without any precautions, taking into consideration

that the output voltage should remain below 60 V for SELV

operation.

Fig. 9

Overload switch-off (hiccup mode).

100

[%]

t [ms]

05041a

0.3 s

overload short circuit condition

switch-off

Connection in Parallel

Several converters with equal output voltage can be

connected in parallel and will share their output current quite

equally . However , this may cause st art-up problems and is only

recommended in applications, where one converter is able to

deliver the full load current, e.g., in true redundant systems.

Typical Performance Curves

Fig. 10

Vo versus Io (typ) of single-output models (20I MX4-05)

Fig. 11

Vo versus Io (typ.) of dual-output models (±15 V), with load

connected between Vo+ and Vo–.

Fig. 12

Cross load regulation of dual-output models. Vo1 versus Io1

(typ) for various Io2 (40IMX4-1515).

14.5

15.5

16.5

[V]

20 40 60 80 100 120

140 mA

= 140 mA

= 14 mA

05058a

5.25

5.0

4.75

4.5

4.25

4.0

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 A

[V]

05056b

28.5

29.5

30.5

31.5

Vo1 + Vo2 [V]

20 40 60 80 100 120 140 mA

05057a

IMX4 Series Data Sheet

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Fig. 14

Efficiency versus input voltage and load.

Typical values (40IMX4-1212).

Fig. 13

Flexible load distribution on dual outputs (2 ×12 V) with

load variation from 0 to 150% of Po1 nom on output 1.

Output 2 loaded with 25% of Po2 nom.

[%]

05060a

25 50 75 100

o nom

[%]

i nom

i max

i min

Electromagnetic Comp atibility (EMC)

Electromagnetic Immunity

Table 8: Immunity type tests

Phenomenon Standard Class Coupling Value Waveform Source Test In Per-

level mode applied imped. procedure oper. form. 2

Electrostatic IEC/EN 2 contact discharge 4000 Vp1/50 ns 330 Ω10 positive and yes B

discharge 61000-4-2 3 air discharge 8000 Vp10 negative

to case discharges

Electromagnetic IEC/EN 3 3 antenna 10 V/m AM 80 % n.a. 80 – 1000 MHz yes A

field 61000-4-3 1 kHz

3 antenna 10 V/m PM, 50% duty n.a. 900 MHz yes A

cycle, 200 Hz

repetition frequ.

Electrical fast IEC/E N 4 direct +i/–i ±4000 Vpbursts of 5/50 ns 50 Ω60 s positive yes B

transients/burst 61000-4-4 5 kHz repet. rate, 60 s negative

15 ms burst, coupling mode

300 ms period

Surges IEC/EN 2 4 +i/–i 1000 Vp1.2/50 µs 2 Ω5 pos. and 5 neg. yes B

61000-4-5 surges

RF conducted I E C/EN 3 +i/–i 3 VAC A M 80 % 50 Ω0.15 to 80 MHz yes A

immunity 61000-4-6 (140 dBµV) 1 kHz 150 W

1i = input, o = output

2Performance criterion: A = normal operation, no deviation from specifications, B = temporary loss of function or deviation from specs.

3Corresponds to the railway standard EN 50121-3-2:2000, table 9.1

4External components required.

, V

[V]

05059b

12.8

12.4

11.6

11.2 030

60 90 120

150 % I

o1 no

IMX4 Series Data Sheet

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0.2 0.5 1 2 5 10 20 MHz

dbµV

20IMX4-cond_P

20IMX4-2424-8, Peak Vi+, conducted, 0.15 - 30 MHz, Uster, 30-Jun-06

Ci = 100 µF, Vi = 20 V, Ro = 660 ohm, lead length 10 cm.

EN 55011 A

Fig. 15a

Typical disturbance voltage (peak) at the pos. input according

to EN 55011/55022, measured at Vi nom and Io nom.

Output leads 0.1 m, twisted. Input capacitors see table 3.

(20IMX4-2424-8).

Electromagnetic Emission

Conducted RFI noise at input according to EN 55011/55022

Mechanical Data

Dimensions in mm (inchies).

Tolerances ±0.3 mm, unless noted

Fig. 16

Case with standard or alternative pinout (option K)

Material: Fortron black; weight: <10 g

Fig. 17

Open frame (option Z)

Weight: <10 g

Fig. 15b

Typical disturbance voltage (peak) at the pos. input according

to EN 55011/55022, measured at Vi nom and Io nom.

Output leads 0.1 m, twisted. Input capacitors see table 3.

(40IMX4-05-8Z).

Fig. 15c

Typical disturbance voltage (peak) at the pos. input

according to EN 55011/55022, measured at Vi nom and Io nom.

Output leads 0.1 m, twisted. Input capacitors see table 3.

31 (1.22")

20 (0.79")

13 24

11 x 2.54 (0.1")

S90004a

8.5

(0.33")

0.5 (0.02")

3 (0.12")

15.24 (0.6")

European

Projection

0.2 0.5 1 2 5 10 20 MHz

dbµV

40IMX4-cond_P

40IMX4-05-8Z, Peak Vi+, conducted, 0.15 - 30 MHz, Uster, 30-Jun-06

Ci = 47 µF, Vi = 40 V, Ro = 8.2 ohm, lead length 10 cm.

EN 55011 A

0.2 0.5 1 2 5 10 20 MHz

dbµV

70IMX4-cond_P

70IMX4-15-8, Peak Vi+, conducted, 0.15 - 30 MHz, Uster, 1-Sep-06

Ci = 330 µF, Vi = 70 V, Ro = 68 ohm, lead length 10 cm.

EN 55011 A

33 (1.3")

20 (0.79")

12 1

13 24

11 x 2.54 (0.1")

s09042c

15.24 (0.6")

8.5

+0 /-0.1

(0.33")

0.5 (0.02")

3.1 (0.12.2")

Measuring point

of case temperature T

IMX4 Series Data Sheet

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Immunity to Environment al Conditions

Table 9: Mechanical and climatic stress

Test Method Standard Test conditions Status

Ca Damp heat IEC/EN 60068-2-78 Temperature: 40 ±2 °C Converter

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

Duration: 56 days operating

Ea Shock IEC/EN 60068-2-27 1 Acceleration amplitude: 100 gn = 981 m/s2Converter

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

Number of bumps: 18 (3 each direction)

Eb Bump IEC/EN 60068-2-29 Acceleration amplitude: 40 gn = 392 m/s2Converter

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

Number of bumps: 6000 (1000 each direction)

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

(sinusoidal) 5 gn = 49 m/s2 (60 to 2000 Hz) operating

Frequency (1 Oc t/min): 10 to 2000 Hz

Test duration: 7.5 h (2.5 h each axis)

Fh Vibration, IEC/EN 60068-2-64 Acceleration spectral density: 0.05 gn2/Hz Converter

broad-band Frequency band: 10 to 500 Hz operating

random Acceleration magnitude: 4.9 g n rms

(digital control) Test duration: 3 h (1 h each axis)

Kb Salt mist, cyclic IEC/EN 60068-2-52 Concentration: 5% (30 °C) Converter

(sodium chloride Duration: 2 h per cycle not

NaCl solution) Storage: 40 °C, 93% rel. humidity operating

Cycles and storage duration: 3 days, 22 h per cycle

1Covers also EN 50155/EN 61373 category 1, class B, body mounted (= chassis of coach)

Failure Rates

Table 10: Temperature specifications, valid for air pressure of 800 to 1200 hPa (800 to 1200 mbar)

Temperature Standard (-8) Unit

Characteristics Conditions min max

TAAmbient temperature Operational 1 –40 85 °C

TCCase temperature –40 105

TSStorage temperature Non operational –55 105

1See Thermal Considerations

Temperatures

Table 11: MTBF

MTBF Ground benign Ground fixed Ground mobile Unit

TC = 40 °C TC = 40 °C TC = 7 0 °C TC = 50 °C

40IMX4-05-8 (MIL-HDBK-217F) 890 000 440 000 247 000 362 000 h

40IMX4-1212-8 (Bellcore) 3 535 000 1 768 000 917 000 476 000

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Safety and Installation Instructions

Installation Instruction

Installation of the dc-dc 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; see Mechanical Data.

The converters should be connected to a secondary circuit.

Do not open the converter.

Ensure that a converter failure does not result in a hazardous

condition.

To prevent excessive current flowing through the input lines in

case of a short-circuit, an external fuse specified in table 6

should be installed in the non-earthed input supply line.

Pin Allocation

Fig. 18

Foot print

Table 12: Pin allocation for standard and option Z

Pin Single-output models Dual-output models

2Vi– Vi–

3Vi– Vi–

10 n.c. --

11 -- Vo–

14 Vo+ Vo+

16 Vo– Go

22 Vi+ Vi+

23 Vi+ Vi+

Table 13: Pin allocation for option K

Pin Single-output models Dual-output models

1Vi+ Vi+

2 n.c. --

10 -- Go

11 -- Go

12 Vo– --

13 Vo+ Vo–

15 -- Vo+

24 Vi– Vi–

Table 14: Electric strength test voltages

Characteristic Input to output Unit

5IMX4 20/40IMX4 70IMX4

Factory test >1 s 0.77 1.5 1 1.5 kVAC

Equivalent DC test voltage 1.0 2.0 1 2.0 kVDC

Coupling capacitance 2.2 typ. 1.1 typ. 1.1 nF

Insulation resist. (500 VDC) -- >100 >100 MΩ

1Converters produced 2013 or later; older units were tested with

1.2 kVAC.

13 24

10013b

Bottom view

Standards and Approvals

The converters are approved according to UL/CSA 60950-1 and

IEC/EN 60950-1 2nd Edition.

The converters have been evaluated for:

• Building-in

• Basic insulation input to output, based on their maximum

input voltage

• Pollution degree 2 environment

• Connecting the input to a secondary circuit, which is subject

to a maximum transient rating of 1500 V for 20IMX4 and

40IMX4, and 2000 V for 70IMX4 models.

The converters are subject to manufacturing surveillance in

accordance with the above mentioned standards and with ISO

9001:2008.

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 of the converters (except opt. Z) is IP 40

for models with Revision BA (or later). Older models have IP 30.

In order to avoid possible damage, any penetration of cleaning

fluids should be prevented, since the power supplies are not

hermetically sealed.

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

unlacquered; they may be lacquered by the customer, for

instance together with the mother board. Cleaning agents are

not permitted – except washing at room temperature with

isopropyl alcohol. If necessary, the mother board must be

cleaned, before fitting the open-frame converter.

Note: Cleaning liquids may damage the adhesive joints of the

ferrite cores.

Isolation

The electric strength test is performed in the factory as a routine

test in accordance with EN 50514 and IEC/EN 60950. The

Company will not honor any warranty claims resulting from

incorrectly executed electric strength field tests.

IMX4 Series Data Sheet

4 W att DC-DC Converters

BCD20006-G Rev AE, 16- Sep-2015 Page 12 of 12

MELCHER

The Power Partners.

Description of Options

Option K: Alternative Pinout

This pinout is compatible with other converters on the market.

Option Z: Open Frame

For applications, where the protection of the case is not

necessary or in the case that the motherboard should be

cleaned and lacquered with the converter fitted.

Option G: RoHS-6

Converters with a type designation ending with G are RoHS-

compliant for all six substances.

NUCLEAR AND MEDICAL APPLICATIONS - These products are not designed or intended for use as critical component s in life support systems,

equipment used in hazardous environments, or nuclear control systems.

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.