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IMX7, IMS7 Series Data Sheet

7-Watt DC-DC Converters

BCD20007-G Rev AF, 31-Jul-2015 Page 1 of 14

MELCHER

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50.8

2.0"

25.4

1.0"

10.5

0.42"

Features

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

products are available.

•Input voltage ranges up to 150 VDC

•1 or 2 isolated outputs up to 48 V

•1500 to 2000 VAC voltage withstand test

•Extremely wide input voltage ranges

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

•High efficiency (typ. 84%)

• Input undervoltage lockout

• Inhibit input, adjustable output voltages

• Flex power: flexible load distribution on outputs

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

•High reliability and no derating

•Operating ambient temperature –40 to +85 °C

•Thermal protection

• Supplementary insulation

• Planar technology for best mechanical stability

• 2” × 1” case with 10.5 mm profile

Description

The IMX7/IMS7 Series of board-mountable 7 Watt DC-DC

converters have been designed according to the latest

industry requirements and standards. The converters are

particularly suit able for use in mobile or stationary applications

in transport, railways, industry, or telecom, where variable

input voltages or high transient voltages are prevalent.

Covering a total input voltage range from 8.4 V to 150 V with

six different models, the converters are available with single

and electrically-isolated double outputs from 3.3 up to 48 V

with flexible load distribution on double outputs. A shutdown

input allows remote on/off.

Features include efficient input and output filtering with good

transient and surge protection, low output ripple and noise,

consistently high efficiency over the entire input volt age range,

and high reliability as well as excellent dynamic response to

load and line changes.

The converters provide supplementary insulation with SELV

outputs as for instances required in battery-supported

systems, where the bus voltage may exceed the SELV limit of

60 V. The models 70IMX7 and 110IMX7 are CE-marked.

The circuitry is comprised of integral planar magnetics. All

components are automatically assembled and securely

soldered onto a single PCB without any wire connections.

Magnetic feedback ensures maximum reliability and

repeatability in the control loop over all operating conditions.

Careful considerations of possible thermal stresses ensure the

absence of hot spots, providing long life in environment s, 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. For extremely high

vibration environments the case has holes for screw mounting.

Several options, such as open-frame, provide a high level of

application-specific engineering and design-in flexibility.

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

2nd Ed.

1 70/1 10IMX7 models

Table of Contents Page Page

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

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

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

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

Electrical Output Data ............................................................7

Auxiliary Functions.................................................................9

Electromagnetic Compatibility (EMC) .................................. 11

Immunity to Environmental Conditions ................................12

Mechanical Data ..................................................................1 3

Safety and Installation Instructions......................................1 3

Description of Options .........................................................1 4

IMX7, IMS7 Series Data Sheet

7-Watt DC-DC Converters

BCD20007-G Rev AF, 31-Jul-2015 Page 2 of 14

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Model Selection

Table 1: Model Selection

Ou tput 1 Ou tput 21 Output power Input voltage Efficiency Model Options

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

ηη

ηmin ηη

ηη

ηtyp

[V] [A] [V] [A] 1 [W] [V] [%] [%]

3.3 1.5 - - 5 8.4 – 36 74 78 20IMX7-03-8 Z, G

3.3 1.5 - - 5 14 – 36 75.5 79 24IMS7-03-9 Z, G

3.3 1.5 - - 5 16.82 – 75 74.7 79 40IMX7-03-8 Z, G

3.3 1.5 - - 5 36 – 75 77 79 48IMS7-03-9 Z, G

3.3 1.5 - - 5 40 – 121 76 78 70IMX7-03-8 Z, G

3.3 1.5 - - 5 60 – 150274.5 78 110IMX7-03-8 Z, G

5.1 1.2 - - 6.1 8.4 – 36 75.5 78 20IMX7-05-8 M, Z, G

5.1 1.2 - - 6.1 14 – 36 77 80 24IMS7-05-9 Z, G

5.1 1.2 - - 6.1 16.82 – 75 79 81 40IMX7-05-8 M, Z, G

5.1 1.2 - - 6.1 36 – 75 78 81 48IMS7-05-9 Z, G

5.1 1.2 - - 6.1 40 – 121 75.5 78 70IMX7-05-8 M, Z, G

5.1 1.2 - - 6.1 60 – 150376 79 110IMX7-05-8 M, Z, G

5 0.6 5 0.6 6 8.4 – 36 77 81 20IMX7-05-05-8 M, Z, G

5 0.7 5 0.7 7 14 – 36 79 82 24IMS7-05-05-9 Z, G

5 0.7 5 0.7 7 16.82 – 75 79.5 82 40IMX7-05-05-8 M, Z, G

5 0.7 5 0.7 7 36 – 75 81.5 83 48IMS7-05-05-9 Z, G

5 0.7 5 0.7 7 40 – 121 81 82 70IMX7-05-05-8 M, Z, G

5 0.7 5 0.7 7 60 – 150378 80 110IMX7-05-05-8 M, Z, G

12 0.25 12 0.25 6 8.4 – 36 80.5 83 20IMX7-12-12-8 M, Z, G

12 0.3 12 0.3 7.2 14 – 36 81.5 85 24IMS7-12-12-9 Z, G

12 0.3 12 0.3 7.2 16.82 – 75 82.5 84 40IMX7-12-12-8 M, Z, G

12 0.3 12 0.3 7.2 36 – 75 82 84 48IMS7-12-12-9 Z, G

12 0.3 12 0.3 7.2 40 – 121 83 85 70IMX7-12-12-8 M, Z, G

12 0.3 12 0.3 7.2 60 – 150380 83 110IMX7-12-12-8 M, Z, G

15 0.2 15 0.2 6 8.4 – 36 81 83 20IMX7-15-15-8 M, Z, G

15 0.24 15 0.24 7.2 14 – 36 81.5 84 24IMS7-15-15-9 Z, G

15 0.24 15 0.24 7.2 16.82 – 75 81 84 40IMX7-15-15-8 M, Z, G

15 0.24 15 0.24 7.2 36 – 75 82 84 48IMS7-15-15-9 Z, G

15 0.24 15 0.24 7.2 40 – 121 81.5 83 70IMX7-15-15-8 M, Z, G

15 0.24 15 0.24 7.2 60 – 150379 82 110IMX7-15-15-8 M, Z, G

24 0.13 24 0.13 6.2 8.4 – 36 79 83 20IMX7-24-24-8 M, Z, G

24 0.15 24 0.15 7.2 14 – 36 82 84 24IMS7-24-24-9 Z, G

24 0.15 24 0.15 7.2 16.82 – 75 82 84 40IMX7-24-24-8 M, Z, G

24 0.15 24 0.15 7.2 36 – 75 82 84 48IMS7-24-24-9 Z, G

24 0.15 24 0.15 7.2 40 – 121 80 83 70IMX7-24-24-8 M, Z, G

24 0.15 24 0.15 7.2 60 – 150381 84 110IMX7-24-24-8 M, Z, G

1Flexible load distribution on double-outputs possible. If only one output is used, connect both outputs of double-output models in parallel.

2Operation at low input voltage possible, if Po is reduced to approx. 80% of Po nom at Vi min = 14.1 V.

3U p to 154 V for 2 s

NFND: Not for new designs. Preferred for new designs

Note: Use 20IMX7 to replace 24IMS7 and 40IMX7 to replace 48IMS7.

IMX7, IMS7 Series Data Sheet

7-Watt DC-DC Converters

BCD20007-G Rev AF, 31-Jul-2015 Page 3 of 14

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Functional Description

The IMX7/IMS7 Series DC-DC converters are feedback-

controlled flyback converters using current mode PWM (Pulse

Width Modulation).

In the case of single-output models, the output is directly

sensed and fed back to the primary control circuit via a pulse

transformer, resulting in tight regulation of the output voltage.

The R input is referenced to the secondary side and allows for

programming the output voltages in the range 75 to 105% of

Vo nom, using either an external resistor or an external voltage

source.

For double-output models, the output voltage is sensed by a

separate transformer winding close to the secondary and fed

Fig. 2

Block diagram of double-output models

Fig. 1

Block diagram of single-output models

back to the primary control circuit. Close magnetic coupling is

provided by the planar construction, ensuring very good

regulation, and allowing for flexible load distribution. The Trim

input of double-output models is referenced to the primary side,

and allows for programming the output voltages in the range of

100 to 105% of Vo nom by means of an external resistor , or within

75 to 100% of Vo nom, using an external voltage source.

Current limitation is provided by the primary circuit, thus limiting

the total output current (Io nom for the single- and the sum Io1 nom

+ Io2 nom for double-output models).

The inhibit input i allows remote control of the outputs; pin i

must be connected to Vi– to activate the converter.

Part Number Description

Input voltage range Vi

8.4 – 36 V .............................................. 2 0

14 – 36 V ............................................... 2 4

16.8 – 75 V ............................................ 40

36 – 75 V ............................................... 4 8

40 – 121 V ............................................. 7 0

60 – 150 V ........................................... 110

Series.............................................................. IMX7, IMS7

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

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

Operating ambient temperature TA

–40 to 85 °C ............................................... -8

–40 to 71 °C ...............................................-9

Options: Surface mount version1............................................M

Open frame1.....................................................................Z

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

Obsolete option: C-pinout ............................................... C

1Option M and Z exclude each other.

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

Example: 40IMX7-05-05-8ZG: DC-DC converter, input voltage range 16.8 – 75 V, 2 outputs providing each 5 V, 700 mA,

temperature range –40 to 8 5 °C, open frame, RoHS compliant for all six substances.

40 IMX7 - 05 - 05 -8 Z G

PWM

2 × 2200 pF

1500 V

Vi+

Vi–

n.c.

Vo+

–

n.c.

03025a

PWM

2 × 2200 pF 14

Vi+

Trim

Vi –

Vo1+

Vo1–

Vo2+

Vo2–

n.c.

03042b

IMX7, IMS7 Series Data Sheet

7-Watt DC-DC Converters

BCD20007-G Rev AF, 31-Jul-2015 Page 4 of 14

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Electrical Input Data

General conditions:

–T

A = 25 °C, unless TC is specified.

– Connector pin i connected with Vi–.

– Trim or R input not connected.

Table 2a: Input data of IMX7

Input 20IMX7 40IMX7 70IMX7 110IMX7 Unit

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

ViInput voltage range1TC min – TC max 8.4 36 16.8 6 75 40 121 60 150 7V

Vi nom Nominal input voltage Io = 0 – Io nom 20 40 70 110

Vi sur Repetitive surge voltage abs. max input (3 s) 50 5 100 150

tstart up Converter 2 switch on Worst case condition at 0.25 0.5 0.25 0.5 0.25 0.5 0.25 0.5 s

start-up time inh. release Vi min and full load 0.1 0.1 0.1 0.1

trise Rise time 2 Vi nom resistive load 5 5 5 5 m s

Io nom capacitive load 12 12 12 12

Ii o No load input current Io = 0, Vi min – Vi max 15 30 8 15 8 15 8 15 mA

CiInput capacitance (for surge calculation) 4.7 0.5 0.2 0.2 µ F

Vinh Inhibit voltage converter operating –10 +0.8 –10 +0.8 –10 +0.8 –10 +0.8 V

converter inhibited 2.4 Vi max 2.4 Vi max 2.4 Vi max 2.4 Vi max

or open or open or open or open

Iinh Inhibit current converter operating – 0.5 –0.5 – 0.5 –0.5 mA

converter inhibited 1 1 1 1

Ii inh Input current when the Vi min – Vi max 3333

converter is inhibited

Iinr p Inrush peak current Vi = Vi nom 4 3.8 3.7 4.2 5.6 A

fsSwitching frequency Vi min – Vi max, Io = 0 – Io nom approx. 400 approx. 400 approx. 400 approx. 300 kHz

Ii rr Reflected ripple current Io = 0 – Io nom 50 30 20 10 mApp

Vi RFI Input RFI level conducted EN 55022 3 AAAA

1Vi min will not be as stated, if Vo is increased above Vo nom by use of the R or Trim input. If the output voltage is set to a higher value, Vi min

will be proportionally increased.

2Measured with a resistive and the max. admissible capacitive load.

3Measured with a lead length of 0.1 m, leads twisted. Double-output models with both outputs in parallel. 70/110 IMX7 models need an

external capacitor at the input, e.g., 1 µF film or ceramic.

4Source impedance according to ETS 300132-2, version 4.3, at Vi nom.

5The DC-DC converter shuts down automatically at approx. 38 V.

6Operation at lower input voltage possible: Po approx. 80% of Po nom at Vi min = 14.4 V.

7U p to 154 V for 2 s

Fig. 3

Converter start-up and rise time

o nom

start up

rise

04008a

IMX7, IMS7 Series Data Sheet

7-Watt DC-DC Converters

BCD20007-G Rev AF, 31-Jul-2015 Page 5 of 14

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Table 2b: Input data of IMS7; general conditions as in table 2a

Input 24IMS7 48IMS7 Unit

Characteristics Conditions min typ max min typ max

ViInput voltage range 1TC min – TC max 14 36 36 75 V

Vi nom Nominal input voltage Io = 0 – Io nom 24 48

Vi sur Repetitive surge voltage abs. max input (3 s) 50 100

tstart up Converter 2 switch on Worst case condition at 0.4 0.6 0.3 0.6 s

start-up time inh. release Vi min and full load 0.1 0.1

trise Rise time 2 Vi nom resistive load 5 5 m s

Io nom capacitive load 12 12

Ii o No load input current Io = 0, Vi min – Vi max 12 24 6 12 mA

CiInput capacitance (for surge calculation) 0.8 0.5 µ F

Vinh Inhibit voltage converter operating –10 +0.8 –10 +0.8 V

converter inhibited 2.4 Vi max 2.4 Vi max

or open or open

Iinh Inhibit current converter operating – 0.5 – 0.5 mA

converter inhibited 1 1

Ii inh Input current when the Vi min – Vi max 33

converter is inhibited

Iinr p Inrush peak current Vi = Vi nom 4 4.0 3.9 A

fsSwitching frequency Vi min – Vi max, Io = 0 – Io nom approx. 330 approx. 330 kHz

Ii rr Reflected ripple current Io = 0 – Io nom 40 30 mApp

Vi RFI Input RFI level conducted EN 55022 3 AA

1Vi min will not be as stated, if Vo is increased above Vo nom by use of the R or Trim input. If the output voltage is set to a higher value, Vi min

will be proportionally increased.

2Measured with a resistive and the max. admissible capacitive load.

3Measured with a lead length of 0.1 m, leads twisted. Double-output models with both outputs in parallel. 70/110 IMX7 models need an

external capacitor at the input, e.g. 1 µF film or ceramic.

4Source impedance according to ETS 300132-2, version 4.3, at Vi nom

IMX7, IMS7 Series Data Sheet

7-Watt DC-DC Converters

BCD20007-G Rev AF, 31-Jul-2015 Page 6 of 14

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Input Transient Voltage Protection

In many applications transient voltages on the input of the

converter may occur and are possibly caused by short circuits

between Vi+ and Vi–, where the network inductance may

cause high energy pulses.

In order to protect the converters, transient suppressors are

fitted to the input; see table below:

Table 3: Built-in transient voltage suppressor

Model Breakdown Peak Power Peak Pulse

Voltage at 1 ms Current

VBR nom PPIPP

20IMX7 1 overvoltage lockout at approx. 38 V

24IMS7 2 53 V 600 W 7.7 A

40IMX7 2 100 V 1500 W 11 A

48IMS7 2 100 V 600 W 4.1 A

70IMX7 2 144 V 600 W 2.9 A

110IMX7 2 167 V 600 W 2.5 A

1The built-in overvoltage trigger shuts down the converter at

approx. 38 V protecting the input up to 50 V. For higher transient

voltages an external suppressor or voltage limiting circuit as, e.g.,

for IEC/EN 61000-4-5, level 2 compliance should be provided.

2If transients generating currents above the peak pulse current are

possible, an external limiting network such as the circuit

recommended for IEC/EN 61000-4-5, level 2 compliance, is

necessary.

To achieve IEC/EN 61000-4-5, level 2 compliance, an

additional inductor and capacitor should be provided externally

as shown in the figure below. The components should have

similar characteristics as listed in table 4.

Input Fuse and Reverse Polarity Protection

The suppressor diode on the input also provides for reverse

polarity protection by conducting current in the reverse

direction, thus protecting the converter. An external fuse is

required to limit this current. We recommend for:

– 20IMX7 and 24IMS7 a fast 2 A (F2A) fuse

– 40IMX7 and 48IMS7 a fast 1 A (F1A) fuse

– 70IMX7 a fast 0.63 A (F.63A) fuse

– 110IMX7 a fast 0.63 A (F.63A) fuse.

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 limit this current further.

Fig. 5

Typical inrush current at Vi nom, Po nom measured according to

ETS 300132-2 (40IMX7).

0 20 40 60 80 µs

04030a

Table 4: Components for external circuitry to comply with

IEC/EN 61000-4-5, see table 8

Model L C D

20IMX7 330 µ H, 1 A, 0.115 Ω68 µF, 63 V 1.5KE39A

24IMS7 – – –

40IMX7 330 µ H, 0.6 A, 0.42 Ω47 µF, 100 V 1.5KE100A

48IMS7 – – –

70IMX7 1000 µH, 0.6 A, 0.42 Ω22 µF, 160 V 1.5KE120A

110IMX7 330 µH, 0.2 A 22 µF, 200 V 1.5KE170A

Note: Suppressor diode D is only necessary for 20IMX7 models.

To withstand 150 V transients according to 19 Pfl 1, applicable for

40IMX7 models, the same external circuitry with similar

components as for IEC/EN 61000-4-5, level 2 compliance can be

used.

Fig. 4

Example for external circuitry to comply with IEC/EN

61000-4-5, level 2 (transzorb D only for 20IMX7).

Vi+

Vi–

07064

IMX7, IMS7 Series Data Sheet

7-Watt DC-DC Converters

BCD20007-G Rev AF, 31-Jul-2015 Page 7 of 14

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Electrical Output Data

General conditions:

–T

A = 25 °C, unless TC is specified.

– Pin i connected with Vi–; Trim or R input left open-circuit.

Table 5a: Output data for single-output models

Output Vo nom 3.3 V 5.1 V Unit

Characteristics Conditions min typ max min typ max

VoOutput voltage setting Vi nom 3.28 3.32 5.07 5.13 V

Io nom Output current (nom.) Vi min – Vi max 1.5 1.2 A

Io L Current limit2Vi nom 1.78 2.7 1.56 2.0

∆VoLine and load regulation Vi min – Vi max ±1 ±1 %

Io = (0.05 – 1 ) Io nom

voOutput voltage noise Vi min – Vi max 570 70 mVpp

other models Io = Io nom 620 40 20 40

110IMX7 40 50 40 50

Vo clp Output overvoltage limit 7 Minimum load 1% 115 130 115 130 %

Co ext

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

tdload Recovery time Io nom ↔ 1/2 Io nom 11ms

regulation

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

∆Vo/∆TC (TC min to TC max)Io = (0.05 – 1 ) Io nom

Table 5b: Output data for double-output models

Output Vo nom 2 × 5 V 2 × 12 V 2 ×15 V 2 × 24 V Unit

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

Vo1 Output voltage IMX7 Vi nom 4.96 5.04 11.90 12.10 14.88 15.12 23.81 24.19 V

Vo2 setting Io1 = I o2 = 0.5 Io nom 4.95 5.05 11.88 12.12 14.85 15.15 23.75 24.25

Vo1 IMS7 Vi nom 4.92 5.08 11.82 12.18 14.78 15.22 23.64 24.36

Vo2 Io1 = I o2 = 0.5 Io nom 4.92 5.08 11.82 12.18 14.78 15.22 23.64 24.36

Io nom Output current 20IMX7 Vi min – Vi max 2 × 0.6 2 × 0.25 2 × 0.2 2 × 0.13 A

(nom.)1other models 2 × 0.7 2 × 0.3 2 × 0.24 2 × 0.15

Io L Current 20IMX7 Vi nom 1.8 2.1 0.7 0.9 0.5 0.7 0.35 0.45

limit 2 3 other models 1.8 2.0 0.8 1.0 0.55 0.9 0.38 0.5

∆Vo1 Line regulation Vi min – Vi max, Io nom ±1 ±1 ±1 ±1 %

∆Vo l Load regulation 4Vi nom, (0.1 – 1) Io nom ±3 ±3 ±3 ±3

vo1, 2 Output voltage noise Vi min – Vi ma 580 120 150 240 mVpp

Io = Io nom 620 40 25 50 30 60 50 100

Vo clp Output overvoltage limit 7 Minimum load 1% 115 130 115 130 115 130 115 130 %

Co ext Admissible capacitive loa d30 2000 0 300 0 200 0 100 µF

Vo d Dynamic Voltage deviat. Vi nom ±150 ±330 ±350 ±600 mV

tdload Recovery time Io nom ↔ 1/2 Io nom 11 1 1ms

regulation

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

of output voltage (0.05 – 1) Io nom

1Each output is capable of delivering full output power Po nom according to table Model Selection.

2The current limit is primary side controlled. Io L is defined when Vo dropped to 85 to 94%.

3Measured with both outputs connected in parallel.

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.

7The overvoltage protection is not tracking with the R control.

Admissible capacitive load 0 2500 0 2000 µF

IMX7, IMS7 Series Data Sheet

7-Watt DC-DC Converters

BCD20007-G Rev AF, 31-Jul-2015 Page 8 of 14

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Thermal Considerations

If the 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 (see Mechanical Data) will approach 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, such as 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, TA may be higher or lower.

Caution: The case temperature TC measured at the measuring

point of case temperature (see Mechanical Data) 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.

Fig. 8a

Vo versus Io (typ.) of single-output models with Vo = 5.1 V

Fig. 8b

Vo versus Io (typ.) of double-output models (2 ×12 V) with both

outputs in parallel

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 overvoltage 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 overvoltage, 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 or Parallel

The outputs of single- or double-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.

Both outputs of double-output models can be connected in

parallel without any precautions. Several converters (single- or

double-output models) with equal output voltage can be put in

parallel and will share their output current quite equally.

However, this may cause start-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.

Fig. 7

Overload switch-off (hiccup mode).

5.5

5.0

4.5

4.0

3.5

3.0

00.4 0.8 1.2 1.6 I

[A]

[V]

05087a

1.0

0.8

0.6

0.4

0.2

40 60 80

100 °C

o max

JM017

0.5 m/s

100 LFM

natural cooling

100

[%]

05041b

0.3 s

overload short-circuit condition

switch-off

Fig. 6

Maximum allowed output power versus ambient temperature

Vo [V]

0.2 0.4 0.6 0.8 Io total [A]

05086b

IMX7, IMS7 Series Data Sheet

7-Watt DC-DC Converters

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Fig. 10

Flexible load distribution on double-outputs models (2 ×12 V)

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

Output 2 loaded with 25% of Po2 nom.

Vo1, Vo2 [V]

Io1

Io1 nom

05059a

12.8

12.4

11.6

11.2 030

60 90 120 150 [%]

Vo2

Vo1

Typical Performance Curves

Fig. 9

Cross load regulation (typ.) of double-output models (2 ×12

V). The cross-load effect is negligible.

11.5

12.5

13.5

[V]

0.10 0.15 0.20 0.25 0.3 I

[A]

0.05

05088a

= 0.3 A

= 0.03 A

Fig. 11

Efficiency versus input voltage and load.

Typical values (40IMX7-12-12-8).

90 05052a

25 50 75 100 %

Po nom

Vi nom

Vi max

Vi min

η [%]

Auxiliary Functions

Inhibit Function

The output(s) of the converter may be enabled or disabled by

means of a logic signal (TTL, CMOS, etc.) applied to the inhibit

pin. No output voltage overshoot will occur , when the converter

is turned on. If the inhibit function is not required, the inhibit pin

should be connected to Vi– to enable the output (active low

logic, fail safe).

Converter operating: –10 V to 0.8 V

Converter inhibited

or inhibit pin i left open: 2.4 V to Vi max (20/40IMX7,

24/48IMS7)

2.4 V to 75 V (70/110IMX7)

Adjustable Output Voltage

As a standard feature, all IMX7 and IMS7 converters offer

adjustable output voltage(s) by using a control pin. If this pin is

left open-circuit, the output voltage is set to Vo nom. The output

voltage is adjustable in the range of 75 to 105% of Vo nom.The

circuit works for single- and double-output models in a different

way. For output voltages Vo >Vo nom, the minimum input voltage

Vi min (see Electrical Input Data) increases proportionally to Vo/

Vo nom.

IMX7, IMS7 Series Data Sheet

7-Watt DC-DC Converters

BCD20007-G Rev AF, 31-Jul-2015 Page 10 of 14

MELCHER

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Fig. 12

Output voltage adjust for single-output models

Single-output models with R-input:

The R-input (pin 13) is referenced to the secondary side of the

converter. Adjustment of the output voltage is possible by

means of either an external resistor or a voltage source.

Trim

Vo1+

Vo2–

Vext

–

Vi+

Vi–

Rext

Vo1–

Vo2+

06089a

Control

circuit

ref

2.5 V

Fig. 13

Output voltage adjust for double-output models

Double-output models with Trim input:

The T rim input (pin 4) of double-output models is referenced to

the primary side. Figure 13 shows the circuitry. Adjustment of

the output voltage is possible in the range of 100 to 105% of Vo

nom using an external resistor, or in the range of 75 to 105% of

Vo nom using an external voltage source.

a) Adjustment by means of an external resistor Rext.

Programming of the output voltage by means of an

external resistor Rext1 is possible within a limited range of

b) Adjustment by means of an external voltage source Vext.

For external output voltages in the range of 75 to 105% of

Vo nom a voltage source Vext (0 to 20 V) is required,

connected to the Trim-input (pin 4) and Vi–. The table

below indicates typical Vo versus Vext values under

nominal conditions (Vi nom, Io = 0.5 Io nom), with paralleled

outputs or equal load conditions on each output. Direct

paralleling of the Trim-inputs of converters connected in

parallel is feasible.

100 to 105% Vo nom. Rext should be connected between pin

4 and Vi–. The following table indicates suitable resistor

values for typical output voltages under nominal

conditions (Vi nom, Io = 0.5 Io nom), with paralleled output s or

equal load conditions on each output.

Caution: Connection of Rext to Vi+ may damage the converter.

Vo+

Vo–

–

4 kΩ

ref

= 2.5 V

Control

logic R

ext1

ext2

06029e

Vi–

Vi+

a) Adjustment by means of an external resistor:

Depending upon the value of the required output voltage,

a resistor Rext1 or Rext2 shall be connected as shown in the

figure below:

Either: Rext1 between the R pin and Vo– to achieve an

output voltage adjustment range of Vo = 75 to 100% of

Vo nom (85 to 100% for 3.3 V outputs):

Rext1 ≈ 4 kΩ • –––––––––

Vo nom – Vo

or: Rext2 between the R pin and Vo+ to achieve an output

voltage range of approximately 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– and R pin.

The control voltage is 1.96 to 2.62 V and allows for

adjustment in the range of 75 to 105% of Vo nom.

Vo • 2.5 V

Vext ≈ ––––––––

Vo nom

Caution: Applying an external voltage >2.75 V may damage the

converter.

Note: Attempting to adjust the output below this range will cause

the converter to shut down (hiccup mode).

Table 6: Rext for Vo > Vo nom

approximate values (Vi nom, Io1 = Io2 = 0.5 Io1/2 nom)

Vo [% Vo nom]Rext [kΩΩ

ΩΩ

Ω]

105 to 108 (107 typically) 0

105 1.5

104 5.6

103 12

102 27

101 68

100 ∞

Note: Applying a control voltage greater than 20 V will set the

converter into a hiccup mode.

Table 7: Vext for Vo = 75 to 105% Vo nom;

typical values (Vi nom, Io1 = Io2 = 0.5 Io1/2 nom)

Vo [% Vo nom]Vext [V]

≥105 0

102 1.6

95 4.5

85 9

75 13

IMX7, IMS7 Series Data Sheet

7-Watt DC-DC Converters

BCD20007-G Rev AF, 31-Jul-2015 Page 11 of 14

MELCHER

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Electromagnetic Emissions

typically occur in many installations, but especially in battery-

driven mobile applications.

Electromagnetic Comp atibility (EMC)

A suppressor diode together with an input filter form an

effective protection against high input transient volt ages, which

Fig. 14a

20IMX7-15-15-8: Typical conducted emissions (peak) at the

input at Vi nom and Io nom according to EN 55011/22. Output

leads 0.1 m, twisted. External input capacitor (1 µF ceramic +

100 µF electrolytic cap)

Electromagnetic Immunity

Table 8: Immunity type tests

Phenomenon Standard Class Coupling Value Waveform Source Test In Perf-

level mode1applied imped. procedure oper. crit. 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 5discharges

Electromagnetic IEC/EN 3 6 antenna 10 V/m AM 80 % n.a. 80 – 1000 MHz yes A

field 2 3 3 V/m 3 1 kHz

ENV 50204 3 antenna 10 V/m PM, 50% duty n.a. 900 MHz yes A

2 3 3 V/m 3 cycle, 200 Hz

repetition frequ.

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

transients/burst 61000-4-4 3 3 2000 Vp 3 5 kHz repet. rate, 60 s negative

transients with transients per

15 ms burst coupling mode

duration, and

300 ms period

Surges IEC/EN 2 4 +i/–i 1000 Vp1.2/50 µs 42 Ω5 pos. and 5 neg. yes B

61000-4-5 13 4 500 Vp 3 0.5 µF surges

RF conducted IEC/EN 3 +i/–i 10 VAC AM modul. 80% 50 Ω0.15 to 80 MHz yes A

immunity 61000-4-6 2 3 3 VAC 1 kHz 150 Ω

1i = input, o = output

2Performance criterion: A = normal operation, no deviation from specifications, B = temporary deviation from specs possible

3Valid for 24IMS7 and 4 8IMS7

4External components required

5R or Trim pin open, i pin connected with Vi–

6Corresponds to the railway standard EN 50121-3-2:2000, table 9.1

PMM 8000 PLUS Date: 5.9.07 Time: 08:00

40IMX7D24-con-p

dbµV

0.2 0.5 1 2

5 10 20 MHz

EN 55022 A

40IMX7-24-24-8 Peak

Name: 40_7_24

20IMX7-15-15-8 Peak

PMM 8000 PLUS

Name: 20_7_15

Date: 5.9.07 Time: 08:18

20IMX7D15-con-p

dbµV

0.2 0.5 1 2

5 10 20 MHz

EN 55022 A

Fig. 14b

40IMX7-24-24-8: Typical conducted emissions (peak) at the

input at Vi nom and Io nom according to EN 55011/22. Output

leads 0.1 m, twisted. External input capacitor (1 µF ceramic +

47 µF electrolytic cap)

IMX7, IMS7 Series Data Sheet

7-Watt DC-DC Converters

BCD20007-G Rev AF, 31-Jul-2015 Page 12 of 14

MELCHER

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PMM 8000 PLUS Date: 5.9.07 Time: 08:00

110IMX7-05-con-p

dbµV

110IMX7-05-8 Peak

Name: 110_7_05

0.2 0.5 1 2

5 10 20 MHz

EN 55022 A

Immunity to Environment al Conditions

Table 9: Mechanical and climatic stress

Test Method Standard Test conditions Status

Cab 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 Oct/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 gn 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, 9 3% rel. humidity operating

Storage duration: 22 h per cycle

Number of cycles: 3

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

Temperature -9 -8 Unit

Characteristics Conditions min max min max

TAAmbient temperature Operational 1 –40 71 –40 85 °C

TCCase temperature –40 95 –40 105

TSStorage temperature Non operational –55 100 –55 105

1See Thermal Considerations

Temperatures

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

Fig. 15

48IMS7-15-15-8: Typical conducted emissions (peak) at the

input at Vi nom and Io nom according to EN 55011/22. Output

leads 0.1 m, twisted. External input capacitor (1 µF ceramic +

47 µF electrolytic cap).

PMM 8000 PLUS Date: 5.9.07 Time: 09:10

dbµV

48IMS7-15-15-8 Peak

Name: 48_7_15

0.2 0.5 1 2

5 10 20 MHz

EN 55022 A

Fig. 14c

110IMX7-05-8: Typical conducted emissions (peak) at the

input at Vi nom and Io nom according to EN 55011/22. Output

leads 0.1 m, twisted. External input capacitor (0.15 µF

ceramic + 4.7 µF electrolytic cap).

IMX7, IMS7 Series Data Sheet

7-Watt DC-DC Converters

BCD20007-G Rev AF, 31-Jul-2015 Page 13 of 14

MELCHER

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50.8 (2")

3.81(0.15")

5 × 3.81

(0.15")

20.3 (0.8")

3 × 5.08 (0.2")

PT 2.2

self tapping screws

410

0.8 × 1.2 (0.03 × 0.05") pins

∅ 1.6 (0.06) PCB holes

10.5

(0.41")

3.4 (0.13")

45.7 (1.8")

25.4 (1")

4.6 (0.18")

S09030b

Measuring point

of case temperature TC

Mechanical Data

Dimensions in mm (inches).

Tolerances ±0.3 mm,

unless otherwise noted.

Material: PPS Fortron 1140L6

Weight: <20 g

Fig. 16

Case IMX7/IMS7 with

standard pinout

European

Projection

Failure Rates

Safety and Inst allation Instructions

Pin Allocation

Fig. 19

Footprint

Bottom view

410

10011

311

Table 12: Pin allocation

Pin Single output Double output

1Vi+ Vi+

2Vi– Vi–

3i i

4 n.c. Trim

10 Vo– Vo1–

11 Vo+ Vo1+

12 Vo– Vo2–

13 R Vo2+

14 n.c. n.c.

Fig. 18

Open-frame

model (option Z)

Fig. 17

SMD pins (option M)

Table 11: MTBF and device hours

Model Standard Ground benign Ground fixed Ground mobile Unit

TC = 40 °C TC = 40 °C TC = 70 °C TC = 50 °C

24IMS7-05-9 MIL-HDBK-217F 634 000 321 000 188 000 271 000 h

40IMX7-12-12-8 MIL-HDBK-217F 851 000 395 000 253 000 342 000

Bellcore 3 019 000 1 510 000 809 000 409 000

40IMX7-05-05-8 Bellcore 3 320 000 1 660 000 871 000 447 000

43.2 (1.7")

S90002b

48 (1.9")

1.27 (0.05")

23 (0.9")

5 x 3.81

(0.15")

8.25

(0.32")

3 x 5.08

(0.2")

410

3.5 ±0.1 (0.14")

1.2 (0.5")

Bottom view

TC Z

Core

50.8

3.81

5.08

3.81

410

0.8 × 1.2 Pins

25.4

4.2

0.8

11.0

42.4

09031a

Measuring point

case temper. T

Bottom view

IMX7, IMS7 Series Data Sheet

7-Watt DC-DC Converters

BCD20007-G Rev AF, 31-Jul-2015 Page 14 of 14

MELCHER

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Standards and Approvals

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

CSA 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 20IMX7, 24IMS7, 40IMX7, 48IMS7

- 2000 V for 70IMX7

- 2500 V for 110IMX7.

The converters are subject to manufacturing surveillance in

accordance with the above mentioned standards.

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 is IP 30, except open-

frame models (option Z).

In order to avoid possible damage, any penetration of cleaning

fluids should be prevented, since the power supplies are not

hermetical 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, and

should not be repeated in the field. The Comp any will not honor

any warranty claims resulting from electric strength field tests.

Installation Instruction

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; 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

conditions.

To prevent excessive current flowing through the input lines in

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

Input Fuse and Reverse Polarity Protection should be installed

in the non-earthed input supply line.

NUCLEAR AND MEDICAL APPLICATIONS - These products are not designed or intended for use as critical components 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.

Table 12: Electric strength test voltages

Characteristic Input to output o/o3Unit

20/40IMX 20/40IMX2110IMX

24/48IMS 70IMX

Factory test >1 s 1.2 1.512.0 0.1 kVAC

Equivalent DC volt. (1.5) (2.1) (2.5) 0.15 kVDC

Coupling 1.2 1.2 1.2 – nF

capacitance

Insulation resist. >100 >100 >100 – MΩ

at 500 VDC

11.5 kVAC according to IEC 60950, sect. 6.2, Telecom equipment;

type test with 1.5 kVAC / 60 s (IEE 802.3).=

220/40IMX7 produced 2014 or later.

3The test voltage between outputs is not applied as routine test.

Description of Options

Option M: SMD pins

This option allows surface mounting of the converters.

Option Z: Open Frame

For applications, where the protection by a housing is not

necessary or in the case that the motherboard should be

lacquered after fitting the converter; see Cleaning Liquids.

Option G: RoHS-6

Converters with a type designation ending by G are RoHS-

compliant for all six substances.