20IMX35-1515-9ZI--Datasheet/数据表在线中文翻译

Rugged Environment

DC-DC Converters <40 Watt

IMX 35 Series

35 Watt DC-DC Converters

IMX 35 Series

Input to output electric strength test up to 4 kV DC

Input voltage: 9...36, 18...75 V DC

2, 3 and 4 outputs

Configurable output voltages from 3.3 to 60 V DC

• Extremely wide input voltage ranges

• Electrical isolation, also between outputs

• Emissions below EN 55022, level B

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

• Programmable input undervoltage lock-out

• Shut down input

10.5

0.41"

63.5

76.2

2.5"

3"

• Output voltages adjustable with flexible load distribu-

tion

• Frequency synchronisation

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

• Operating ambient temperature up to –40...85^°C

• Thermal protection

• 3"× 2,5" case with 10.5 mm profile or 8.9 mm open

frame

• Supplementary insulation

8.9

0.35"

47.8

1.88"

72.8

2.87"

Safety according to IEC/EN 60950, UL 1950

LGA

Approvals pending

Summary

tion. Connected to a secondary circuit the 40 IMX 35 types

provide SELV outputs even if the voltage at the converter

input exceeds the SELV-limit of 60 V DC.

The IMX 35 series of board mountable 35 Watt DC-DC con-

verters has been designed according to the latest industry

requirements and standards. The converters are particu-

larly suitable for use in mobile or stationary applications in

transport, railways, industry, or telecommunication where

variable input voltages or high transient voltages are preva-

lent.

The circuit comprises of two planar magnetics devices and

all components are automatically assembled and solidly

soldered onto a single PCB without any wire connection.

Magnetic feedback ensures maximum reliability and

repeatability in the control loop over all operating condi-

tions. Careful considerations of possible thermal stresses

ensure the absence of hot spots providing long life in envi-

ronments where temperature cycles are a reality. The ther-

mal design without using any potting material allows opera-

tion at full load up to an ambient temperature of 71°C in free

air. For extremely high vibration environments the case has

holes for screw mounting. Various options as e.g. extended

temperature range –40...85°C or an alternative pinout pro-

vide a high level of application specific engineering and de-

sign-in flexibility.

Covering a total input voltage range from 9 up to 75 V with

2 different types. The units are available with double, triple

and quadruple outputs, electrically isolated, from 3.3 V up

to 60 V externally adjustable and with flexible load distribu-

tion. A shut down input allows remote converter on-off. Fea-

tures include consistently high efficiency over the entire in-

put voltage range, high reliability and excellent dynamic re-

sponse to load and line changes.

The converters are designed and built according to the in-

ternational safety standards IEC/EN 60950, UL 1950, CAN/

CSA C22.2 No.950-95. LGA, UL and cUL approvals are in

progress. The IMX 35 types provide supplementary insula-

Table of Contents

Page

Auxiliary Functions ......................................................... 11

Electromagnetic Compatibility (EMC) ............................ 13

Immunity to Environmental Conditions........................... 14

Mechanical Data ............................................................ 15

Safety and Installation Instructions ................................ 16

Description of Option...................................................... 18

Summary.......................................................................... 1

Type Survey and Key Data .............................................. 2

Type Key .......................................................................... 3

Functional Description...................................................... 4

Electrical Input Data ......................................................... 6

Electrical Output Data ...................................................... 8

Edition 1/10.99

1/18

IMX 35 Series

DC-DC Converters <40Watt

Rugged Environment

Type Survey and Key Data

Table 1: Type survey

Output 1

Output 2

Output 3

Output 4

Input voltage Eff. Type

Trim

Opt.

U_{o nom}I_{o nom}U_{o nom}I_{o nom}U_{o nom}I_{o nom}U_{o nom}I_{o nom}

U_{i min}...U_{i max}h_typdesignation

[V DC]

[A]

[V DC]

[A]

[V DC]

[A]

[V DC]

[A]

[V DC]

[%]

3.3

4.25

4.5

5

2.7

2.8

-

9...36

18...75

83

20 IMX 35-03-05-9

40 IMX 35-03-05-9

second.

primary

second.

-8

Z

i

5.1

3.3

3.5

5

2.7

2.8

-

9...36

18...75

84

20 IMX 35-05-05-9

40 IMX 35-05-05-9

12

1.3

1.4

12

1.3

1.4

-

9...36

18...75

87

20 IMX 35-1212-9

40 IMX 35-1212-9

15

1.1

1.2

15

1.1

1.2

-

9...36

18...75

20 IMX 35-1515-9

40 IMX 35-1515-9

3.3

4.25

4.5

4.25

4.5

4.25

4.5

5

12

15

1.35

1.4

0.65

0.7

0.55

0.6

5

12

15

1.35

1.4

0.65

0.7

0.55

0.6

-

9...36

18...75

9...36

18...75

9...36

83

86

20 IMX 35-03D05-9

40 IMX 35-03D05-9

20 IMX 35-03D12-9

40 IMX 35-03D12-9

20 IMX 35-03D15-9

40 IMX 35-03D15-9

18...75

5.1

3.3

3.5

3.3

3.5

3.3

3.5

5

12

15

1.35

1.4

0.65

0.7

0.55

0.6

5

12

15

1.35

1.4

0.65

0.7

0.55

0.6

-

9...36

18...75

9...36

18...75

9...36

83

86

20 IMX 35-05D05-9

40 IMX 35-05D05-9

20 IMX 35-05D12-9

40 IMX 35-05D12-9

20 IMX 35-05D15-9

40 IMX 35-05D15-9

second.

18...75

87

5

1.35

1.4

5

1.35

1.4

5

1.35

1.4

5

1.35

1.4

9...35

18...75

86

87

20 IMX 35 D05D05-9 primary

40 IMX 35 D05D05-9

12

0.65

0.7

12

0.65

0.7

12

0.65

0.7

12

0.65

0.7

9...35

18...75

87

89

20 IMX 35 D12D12-9 primary

40 IMX 35 D12D12-9

15

0.55

0.6

15

0.55

0.6

15

0.55

0.6

15

0.55

0.6

9...35

18...75

88

89

20 IMX 35 D15D15-9 primary

40 IMX 35 D15D15-9

Trim

The Trim input on the primary side influences all outputs, while Trim1 on the secondary side influences the first output (U_o1)

only.

For the units IMX 35-12-12 and IMX 35-15-15 primary Trim (pin 5) is the Trim input influencing both outputs, while pin 18 is

not connected.

For the units IMX 35-03-05 and IMX 35-05-05, secondary Trim1 (pin 18) is the Trim1 input influencing only U_o1, while pin 5

is not connected.

Edition 1/10.99

2/18

Rugged Environment

DC-DC Converters <40 Watt

IMX 35 Series

Type Key

Dual output units

20 IMX 35 - 12 - 12 -9 i Z

Input voltage range U_i

9...36 V DC ........................................... 20

18...75 V DC ........................................... 40

Series ...................................................................... IMX 35

Output 1 of double types .............................. 03, 05, 12, 15

Output 2 of double types .................................... 05, 12, 15

Operating ambient temperature range T_A

–40...71°C (standard) ................................. -9

–40...85°C (option) ..................................... -8

Options:

Inhibit ............................................................ i

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

Triple output units

20 IMX 35 - 05 D05 -9 i Z

Input voltage range U_i

9...36 V DC ........................................... 20

18...75 V DC ........................................... 40

Series ...................................................................... IMX 35

Output 1 of triple types ............................................. 03, 05

Output 2 and 3 of triple types ..................... D05, D12, D15

Operating ambient temperature range T_A

–40...71°C (standard) ................................. -9

–40...85°C (option) ..................................... -8

Options:

Inhibit ............................................................ i

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

Quad output units

20 IMX 35 D05 D05 -9 i Z

Input voltage range U_i

9...36 V DC ........................................... 20

18...75 V DC ........................................... 40

Series ...................................................................... IMX 35

Output 1 and 4 of quad types..................... D05, D12, D15

Output 2 and 3 of quad types..................... D05, D12, D15

Operating ambient temperature range T_A

–40...71°C (standard) ................................. -9

–40...85°C (option) ..................................... -8

Options:

Inhibit ............................................................ i

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

Edition 1/10.99

3/18

IMX 35 Series

DC-DC Converters <40Watt

Rugged Environment

Functional Description

The IMX 35 family of DC-DC converters consists of two

feedback controlled interleaved switching flyback power

trains using current mode PWM (pulse width modulation).

Functionally the converters are of three main types. The

dual output types consist of two electrically isolated outputs

Vo1, Vo2. Vo1 and Vo2 derives from two power trains and

are electrically isolated. Voltage regulation for each output

is achieved with passive transformer feedback from the

main transformer of each power train. Adjustment of the

outputs voltages in the range of 80...105% of U_{o nom}is pos-

sible via Trim input on the primary side (See: Block dia-

gram, dual output types.) The triple output types consist of

3 outputs Vo1, Vo2, Vo3 and two configurations. In the first

configuration Vo1 is a power train with a 5.1 V or 3.3 V out-

put and a synchronous rectifier, thus enabling high effi-

ciency. Also there is active magnetic feedback on this out-

put via a pulse transformer which results in very tight and

reliable regulation of the output voltage. The other two out-

puts Vo2 and Vo3 are electrically isolated double outputs.

Vo2, Vo3 are restricted to being of the same output voltage

(i.e. D05, D12, etc.). Voltage regulation is achieved with a

passive transformer feedback from the main transformer of

that power train.

The quadruple output type consists of 4 outputs and two

power trains. Vo1, Vo4 derive from the first power train and

Vo2, Vo3 from the second one (thus each pair of outputs is

independent from the other one). Voltage regulation for

each pair of outputs is achieved with passive transformer

feedback from the main transformer of each power train.

Each pair of outputs are restricted to being of the same out-

put voltage type (i.e. D05, D12, etc.). If both power trains

have the same output voltage, all outputs may be adjusted

by means of the Trim input. (In case of different output volt-

ages, the Trim1 input influences only Vo1 and Vo4. See:

Block diagram, quadruple output types.)

Current limitation is provided by the primary circuit for each

power train and limits the possible output power for each

pair of outputs. In the case of an overload on either of the

power trains which causes the output voltage to fall less

than typically 60% of U_{o nom}, the entire converter will shut

down and automatically restart in short intervals.

Overtemperature protection is provided for each power

train which will shut down the converter in excessive over-

load conditions with automatic restart approximately in

short intervals.

Adjustment of the output voltages is provided for Vo1 via

the Trim1 pin referenced to the secondary side and allows

for programming of the voltage of output 1 in the range of

approx. 80...105% of U_{o nom}. (See: Block diagram, triple

output types)

03100

Vi+

4

17

15

Vo1+

1

5

6

7

8

2

3

PUL

Vo1–

Trim/n.c.

W

PWM

Ref

18

Trim1/n.c.

SD

Vi–

n.c.

13 Vo2+

11

19

16

Vo2–

n.c.

Fig. 1

Block diagram 1, double output types

Edition 1/10.99

4/18

Rugged Environment

DC-DC Converters <40 Watt

IMX 35 Series

03097

4

17

Vi+

Vo1+

1

5

6

7

1

2

3

PUL

n.c.

W

Control

15

18

Vo1–

PWM

Ref

Trim1

SD

Vi–

n.c.

13

Vo2+

14

12

Vo2–

Vo3+

11

19

Vo3–

n.c.

Fig. 2

Block diagram 2, triple output types

03098

Vi+

4

15

Vo1+

1

5

6

7

8

2

PUL

Trim

16

Vo1–

17 Vo4+

18 Vo4–

13 Vo2+

PWM

W

Ref

SD

Vi–

n.c.

14

12

Vo2–

Vo3+

11 Vo3–

19 n.c.

Fig. 3

Block diagram 3, quadruple output types

Edition 1/10.99

5/18

IMX 35 Series

DC-DC Converters <40Watt

Rugged Environment

Electrical Input Data

General conditions:

– T_A= 25°C, unless T_Cis specified.

– Shut down pin left open circuit (not connected).

– Trim not connected.

Table 2: Input Data

Input

20 IMX

40 IMX

Characteristics

Conditions

min

9 ²

typ

max

36

min

18 ²

typ

max

75

Unit

U_i

Input voltage range ¹

T_{A min}...T_Amax

I_o= 0...I_{o nom}

V DC

U_{i nom}

U_{i sur}

t_{start up}

Nominal input voltage

20

40

Repetitive surge voltage

Abs. max input (3 s)

40

0.5

0.1

100

0.5

0.1

Converter

start-up time ²

Switch on

SD high

Worst case condition at

U_{i min}and full load

0.25

s

t_rise

Rise time ³

U_{i nom}resist load

I_{o nom}capac. load

I_o= 0, U_{i min}...U_{i max}

I_o= 0...I_{o nom}

5

ms

mA

10

20

70

30

8

10

20

50

30

9

I_{i o}

No load input current

Reflected ripple current

Inrush peak current ⁴

Input capacitance

I_irr

I_{inr p}

C_i

U_i= U_{i nom}

A

for surge calculation

Unit shut down

Unit operating

1.5

0.75

µF

U_SD

Shut down voltage

–10...0.7

V DC

open or 2...20

approx. 10

open or 2...20

approx. 10

R_SD

I_SD

Shut down input resistance For current calculations

kΩ

Input current if unit

shut down

U_{i min}...U_{i max}

12

6

mA

f_s

Switching frequency

U_{i min}...U_{i max}, I_o= 0...I_{o nom}

EN 55022 ⁵

approx. 200

B ⁶

approx. 200

B

kHz

u_{i RFI}

Input RFI level, conducted

¹U_{i min}will not be as stated if U_ois increased above U_{o nom}by use of Trim input. If the output voltage is set to a higher value,

U_{i min}will be proportionately increased.

²Input undervoltage lock-out at typ. 90% of U_{i min}

.

³Measured with resistive and max. admissible capacitive load.

⁴Source impedance according to prETS 300132-2, version 4.3.

⁵Measured with a lead length of 0.1 m, leads twisted.

⁶External capacitor required.

Edition 1/10.99

6/18

Rugged Environment

DC-DC Converters <40 Watt

IMX 35 Series

Inrush current

Input Transient Voltage Protection

The inrush current has been kept as low as possible by

choosing a very small input capacitance. A series resistor

may be installed in the input line to further reduce this cur-

rent.

A built-in suppressor diode provides effective protection

against input transients which may be caused for example

by short-circuits accross the input lines where the network

inductance may cause high energy pulses.

04022

Table 4: Built-in transient voltage suppressor

I [A]

Type

Breakdown

voltage

V_{Br nom}[V]

Peak power

at 1 ms

Peak pulse

current

I_pp[A]

4

3

2

P_p[W]

20 IMX 35

40 IMX 35

50

1500

22

100

9.7

1

t [µs]

For very high energy transients as for example to achieve

IEC/EN 61000-4-5 or ETR 283 (19 Pfl1) compliance (as per

table: Electromagnetic Immunity) an external inductor and

capacitor are required. The components should have simi-

lar characteristics as listed in table: Components for exter-

nal circuitry for IEC/EN 61000-4-5, level 2 or ETR 283

(19Pfl1) compliance.

0

20

50 60 70 80 90 100

10

30 40

Fig. 4

Typical inrush current at U_{i nom}, P_{o nom}versus time

(40 IMX 35). Source impedance according to

prETS 300132-2, version 4.3 at U_{i nom}

.

Note: The suppressor diode D is only necessary for

20 IMX 35 types.

04008

U_o

t_rise

U_{o nom}

Table 5: Components for external circuitry for IEC/EN

61000-4-5, level 2 or ETR 283 (19Pfl1) compliance.

Type

Inductor (L)

Capacitor (C)

Diode (D)

1.5 k E47A

-

20 IMX 35

40 IMX 35

t

t_{start up}

04036

L

Fig. 5

Converter start-up and rise time

Vi+

+

C

Reverse Polarity Protection

D

The built-in suppressor diode also provides for reverse po-

larity protection at the input by conducting current in the re-

verse direction. An external fuse is required to limit this cur-

rent.

Vi–

Fig. 6

Example for external circuitry to comply with IEC/EN

61000-4-5 or ETR 283 (19Pfl1); the diode D is only neces-

sary for 20 IMX 35 types.

Table 3: Recommended external fuses

Converter type

20 IMX 35

Fuse type

F8.0A

22

40 IMX 35

F4.0A

04052

11.5

23.8

Fig. 7

Dimensions of inductor L for 20 IMX 35 and 40 IMX 35

types (e.g. Coil Craft, PCH-45 series).

Edition 1/10.99

7/18

IMX 35 Series

DC-DC Converters <40Watt

Rugged Environment

Electrical Output Data

General conditions:

– T_A= 25°C, unless T_Cis specified

– Shutdown pin left open circuit (not connected)

– R input not connected

Table 6a: Output data for single synchronous rectifier (main) output.

Output

3.3 V

5.1 V

Characteristics

Conditions

min typ

max

3.32

min typ max

Unit

V DC

A

U_o

Output voltage

U_{i nom}, I_o= 0.5 I_{o nom}3.28

20 IMX U_{i min}...U_{i max}

5.07

5.13

I_{o nom}Output current

4.25

6.0

3.3

3.5

4.5

40 IMX

I_o1L

I_o2L

Current limit ¹

20 IMX U_{i nom}, T_C= 25°C

U_o1= 93% U_{o nom}

I_o1L

I_o2L

40 IMX

6.1

4.6

DU_{o U}Line/load regulation

U_{i min}...U_{i max}

I_o= (0.05...1) • I_{o nom}

,

±1

%

2

u_o1/2

Output voltage noise

U_{i min}...U_{i max}

I_o= I_{o nom}

70

40

80

40

mV_pp

3

U_{o L}

Output overvoltage limit. ⁴

115

130

4000

±200

1

115

130

3300

±250

1

%

µF

C_{o ext}Admissible capacitive load

u_{o d}

t_d

Dynamic

load

Voltage deviat. U_{i nom}

_{o nom}↔ ¹/

I_{o nom}

mV

ms

I

2

Recovery time

regulation

IEC/EN 61204

a_Uo

Temperature coefficient

DU_o/DT_C

U_{i min}...U_{i max}

I_o= 0...I_{o max}

±0.02

%/K

Table 6b: Output data for double output power trains.

Output

2 × 5 V

2 × 12 V

min typ max

2 × 15 V

Characteristics

Conditions

min typ max

Unit

U_o1

U_o2

Output voltage

U_{i nom}

I_o= 0.5 I_{o nom}

4.95

4.94

5.05

5.06

11.88

11.86

12.12

12.14

14.85

14.82

15.15 V DC

15.18

I_{o nom}Output current

20 IMX U_{i min}...U_{i max}

40 IMX

2 × 1.3

2 × 1.4

2.5

2 × 0.65

2 × 0.50

2 × 0.56

A

2 × 0.70

1.8

I_oL

Current limit ¹

20 IMX U_{i nom}, T_C= 25°C

1.5

1.6

U_o= 93% U_{o nom}

40 IMX

3.7

2.0

DU_{o U}Line regulation

DU_{o l}Load regulation

U_{i min}...U_{i max}, I_{o nom}

±1

±3

±1

±3

±1

±3

%

U_{i nom}

I_o= (0.1...1) I_{o nom}

2

u_o1/2

Output voltage noise

U_{i min}...U_{i max}

I_o= I_{o nom}

80

40

120

60

150

70

mV_pp

3

U_{o L}

Output overvoltage limit. ⁴

Min. load 1%

115

130

4000

±250

1

115

130

470

±400

1

115

130

330

±400

1

%

C_{o ext}Admissible capacitive load

µF

mV

ms

u_{o d}

t_d

Dynamic

load

Voltage deviat. U_{i nom}

_{o nom}↔ ¹/

I_{o nom}

I

2

Recovery time

regulation

a_Uo

Temperature coefficient

DU_o/DT_C

U_{i min}...U_{i max}

I_o= 0...I_{o max}

±0.02

%/K

¹The current limit is primary side controlled. In the event of a sustained overload condition the thermal protection may cause the unit to

shutdown (restart on cool-down).

²BW = 20 MHz

³Measured with a probe according to EN 61204

⁴The overvoltage protection is via a primary side second regulation loop, not tracking with Trim control.

Edition 1/10.99

8/18

Rugged Environment

DC-DC Converters <40 Watt

IMX 35 Series

Thermal Considerations

Output Overvoltage Protection

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

stationary air (convection cooling) at the indicated maxi-

mum ambient temperature T_{A max}(see table: Temperature

specifications) and is operated at its nominal input voltage

and output power, the case temperature T_Cmeasured at

the Measuring point of case temperature T_C(see: Mechani-

cal Data) will approach the indicated value T_{C max}after the

warm-up phase. However, the relationship between T_Aand

T_Cdepends heavily on the conditions of operation and inte-

gration into a system. The thermal conditions are influ-

enced by input voltage, output current, airflow, temperature

of surrounding components and the surfaces and proper-

ties of the printed circuit board. T_{A max}is therefore only an

indicative value and under practical operating conditions,

the ambient temperature T_Amay be higher or lower than

this value.

The outputs of the converter are protected against overvolt-

ages by a second control loop. In the event of an overvolt-

age on one of the outputs the unit will shut down and

attempt to restart in short intervals. 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 overvoltage protection is not designed to with-

stand externally applied overvoltages.

Typical Performance Curves

General conditions:

– T_A= 25^oC, unless T_Cis specified.

– Shut down pin left open circuit.

– Trim input not connected.

U_o[V]

05019

5.5

Caution: The case temperature T_Cmeasured at the:

Measuring point of case temperature T_C(see: Mechani-

cal Data) may under no circumstances exceed the

specified maximum value. The installer must ensure that

under all operating conditions T_Cremains within the lim-

its stated in the table: Temperature specifications.

5.0

4.5

4.0

3.5

3.0

Short Circuit Behaviour

The current limit characteristic shuts down the converter

whenever a short circuit is applied to an output. It acts self-

protecting and automatically recovers after removal of the

overload condition (hiccup mode).

0

2

3

4

5

I_o[A]

1

Fig. 8

U_oversus I_o(typ) of units with U_o= 5.1 V.

(40 IMX 35-05D12-9).

Overtemperature Protection

The converters individual power trains are protected from

possible overheating by means of an internal temperature

monitoring circuit. It shuts down the unit above the internal

temperature limit and attempts to automatically restart. This

feature prevents from excessive internal temperature build-

ing up which could occur under heavy overload conditions.

U_o[V]

05020

13

12

11

10

9

Connection in Series

The outputs of one or several single or double output power

trains may be connected in series without any precautions.

8

Connection in Parallel

7

The outputs of one or several double output power trains

(except 3.3 or 5.1 V types) with equal nominal output volt-

age can be connected in parallel. Approximate current

sharing between 2 or several power trains is ensured by

their load dependent output characteristic.

I_{o total}[A]

0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8

0

Fig. 9

U

_o1/2versus I_o1/2of double output power trains

(i.e. 2 × 12 V). See: Block diagram 1

Edition 1/10.99

9/18

IMX 35 Series

DC-DC Converters <40Watt

Rugged Environment

U_o4[V]

13.5

U_o1, U_o2[V]

05164

05039

14

13

12

11

10

13.0

I_o4= 0.035 A

12.5

U_o2

U_o1

12.0

11.5

11.0

I_o4= 0.35 A

I_o1

I_{o1 nom}

[%]

50

75

100

125

150

0

25

0.06

0.20

0.30

0.50 0.60 0.70 I_o1[A]

0.10

0.40

Fig. 10

Fig. 11

Cross load regulation U_o4versus I_o1(typ) for various I_o4for

Vo1, Vo4 on power train 1. See: Block diagram dual out-

put types. (20 IMX 35 D12D12-9)

Flexible load distribution on power train 1 of

40 IMX 35 D12D12-9 (4 ¥ 12 V) with load variation from

0...150% of P_{o1 nom}on output 1 (Vo1). Output 2 (Vo4)

loaded with 50% of P_{o4 nom}

.

h [%]

05152

90

h [%]

U_{i min}

U_{i nom}

05153

90

U_{i min}

80

70

60

U_{i max}

80

U_{i nom}

U_{i max}

70

P_o

100 P_{o total}

[%]

25

50

75

P_o

100 P_{o total}

60

[%]

Fig. 12

25

50

75

Efficiency versus input voltage and load. Typical values

40 IMX 35 D12D12-9

Fig. 13

Efficiency versus input voltage and load. Typical values

20 IMX 35 D12D12-9

05041

U_o[%]

overload short circuit condition

100

switch-off

70

8.5

t [ms]

60.5

Fig. 14

Overload switch off (hiccup mode), typical values.

Edition 1/10.99

10/18

Rugged Environment

DC-DC Converters <40 Watt

IMX 35 Series

Auxiliary Functions

06136

Shut Down Function

Vi+

4

Vo1+

17

The outputs of the converters may be enabled or disabled

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

shut down pin. If the shut down function is not required then

it should be left open-circuit.

R_ext1

Trim1

18

15

R_ext2

Converter operating:

Converter shut down: –10...0.7 V

2.0...20 V

Vi–

Vo1–

2

Programmable Input Undervoltage Lockout PUL

A special feature of these units is the accurate undervoltage

lockout protection which protects the units (and system)

from large currents caused by operation at low voltages.

This ensures easier start-up in distributed power systems.

Fig. 15

Output voltage control for the Trim1 input referenced to

the secondary side.

Table 9: U_o1versus R_extfor U_o1= 80...105% U_{o nom}; typical

values (U_{i nom}, I_o1/2= 0.5 I_{o1/2 nom}

Table 7: Turn on and turn off voltage

)

Type

Trigger level

7...8

Hysteresis

≤0.5

Units

V

U_{o nom}

[V]

R_ext1

R_ext2

20 IMX 35

40 IMX 35

U_o1[V]

[kΩ]

U_o1[V]

[kΩ]

14...15.5

≤1

3.3

2.5

2.46

2.97

1.1

2.1

8

3.3

3.47

3.673

∞

11

5

See: Electrical input data for a description of the turn on

turn off voltage levels of the various types.

5

3.33

3.57

4.08

4.59

0.23

0.45

1.3

5

5.36

5.61

∞

10

5

The under voltage lockout levels may be programmed by

use of an external resistor to Trim up the preset levels as

indicated in the table below.

3.5

The units INX 35-12-12 and IMX 35-15-15 exhibit a Trim

input connected to pin 5. This input influences both outputs

simultaneously. Both power trains have passive trans-

former feedback and the Trim input (pin 5) is referenced to

the primary side. Fig. 16 shows the circuit topology. Adjust-

ment of the output voltage is possible by means of either an

external resistor R_extin the range of 100...105% of U_{o nom}or

an external voltage source in the range of 80...105% of

Table 8: Typical values for R_extand the respective lockout

voltage for input voltage.

20 IMX 35

R_ext[kΩ]

40 IMX 35

R_ext[kΩ]

U_min[V]

10

U_min[V]

22

36

18

12

∞

27

10

0

12

26

14

30

U_{o nom}

.

≤8

∞

≤15.5

06137

Vi+

Vo1+

Vo1–

Vo2+

17

4

5

Adjustable Output Voltage

Trim

15

13

As a standard feature, the IMX 35 offer adjustable output

voltages in the range 80...105% of U_{o nom}by use of a con-

trol input pin. The Trim control is offered either on primary or

secondary side of the converter depending on type.

+

Control

circuit

U_ref= 2.5 V

U_ext

R_ext

Vi–

–

Vo2–

2

11

For the dual output types refer to the block diagram 1.

The units IMX 35-03-05 and IMX 35-05-05 feature a first

power train with magnetic feedback and synchronous recti-

fier. The simplified circuit is shown in Fig. 15.

Fig. 16

Output voltage control for double output units by means of

the Trim input on the primary side.

The Trim1 (pin 18) is secondary referenced and influences

only the first power train. Adjustment of the output voltage is

possible by means of an external resistor R_extbetween the

Trim1 pin and either Vo1+ or Vo1–. If the control input is

left open circuit, the output voltage is set to U_{o1 nom}. Table 9

lists typical values required to program the output voltage to

approximately the values of U_o1indicated.

Edition 1/10.99

11/18

IMX 35 Series

DC-DC Converters <40Watt

Rugged Environment

Synchronisation (W)

a) Adjustment by means of an external resistor R_ext

:

This logic input can be used to synchronise the oscillator to

an external frequency source. This pin is edge triggered

with TTL thresholds, and requires a source frequency of

460...520 kHz (duty cycle 10...90%). The external source

frequency is internally divided by two to define the switching

frequency for the converter. If unused, this pin can be con-

nected to V1– (pin 2) or left open-circuit.

Adjustment of the output voltage by means of an external

resistor R_extis possible within the range of 100...105% of

U_{o nom}. R_extshould be connected between the Trim pin 5

and Vi–. Connection of R_extto Vi+ may damage the con-

verter. The following table indicates suitable resistor val-

ues for typical output voltages under nominal conditions

(U_{i nom}, I_o= 0.5 I_{o nom}).

Table 10: R_ext1for U_o> U_{o nom}

;

Reference (Ref)

approximate values (U_{i nom}, I_o= 0.5 I_{o nom}

)

This option provides a stable 5 V (±0.2 V) reference signal

on pin Ref. It is buffered through a 1.33 kΩ resistor. This

may be used also in conjunction with the Trim input pin 5

(primary side) as a limited external voltage source. We

recommend to connect a filter capacitor (0.1 µF) between

Ref and Vi–, if V_refis used.

U_o[% U_{o nom}

]

R

_ext[kΩ]

105...108 (107 typically)

0

105

104

103

102

101

100

3.3

6.2

10

18

39

∞

b) Adjustment by means of an external voltage source U_ext

.

For external output voltage adjustment in the range

80...105% of U_{o nom}a (0...20 V) source U_extis required,

connected to the Trim pin 5 and Vi–. The table below indi-

cates typical U_oversus U_extvalues. Applying a control

voltage 15...20 V will set the converter into a hiccup

mode. Direct paralleling of the Trim pins of units of the

same type connected in parallel is feasible.

Table 11: U_oversus U_extfor U_o= 80...105% U_{o nom}

typical values (U_{i nom}, I_o= 0.5 I_{o nom}

;

)

U_o[% U_{o nom}

]

U_ext[V]

≥105

102

100

95

85

80

0

1.8

2.5

4.25

8.25

10.2

The block diagram 2 shows the triple output units. They of-

fer a Trim1 input (pin 18) on the secondary side to adjust

U_o1. The other outputs remain unchanged. Pin 18 is not

connected. Refer to Fig. 15 for the schematic and Table 8 to

determine R_ext

.

The quadruple output units are shown in block diagram 3All

types with equal output voltage have the Trim function con-

nected to pin 5 which influences all outputs simultaneously.

The schematics shown Fig. 16, the values of the adjust re-

sistor R_extin Table 10 and the external voltage source in

Table 11.

Edition 1/10.99

12/18

Rugged Environment

DC-DC Converters <40 Watt

IMX 35 Series

Electromagnetic Compatibility (EMC)

which typically occur in many installations, but especially in

battery driven mobile applications.

A suppressor diode together with an input filter form an ef-

fective protection against high input transient voltages

Electromagnetic Immunity

Table 12: Immunity type tests

Phenomenon

Standard ¹

Class

Level

Coupling

mode ²

Value

applied

Waveform

Source

Imped.

Test

procedure

In

oper. form.

Per- ³

Electrostatic

discharge

to case

IEC/EN

61000-4-2

2

3

contact discharge 4000 V_p

(R pin open)

1/50 ns

330 Ω

10 positive and

10 negative

discharges

yes

B

air discharge

(R pin open)

8000 V_p

Electromagnetic IEC/EN

field

antenna

10 V/m

AM 80%

1 kHz

26…1000 MHz

yes

A

61000-4-3

ENV 50204

PM, 50% duty

cycle, 200 Hz

resp. frequ.

900 MHz

Electrical fast

transient/burst

IEC/EN

61000-4-4

4

direct +i/–i

4000 V_pbursts of 5/50 ns 50 Ω

5 kHz rep. rate

1 min positive

1 min negative

transients per

coupling mode

yes

B

transients with

15 ms burst

duration and a

300 ms period

Surge

IEC/EN

61000-4-5 ⁵

3

+i/–i

2000 V_p

10 V_rms

1.2/50 µs

2 Ω

5 pos. and 5 neg.

impulses per

coupling mode

Conducted

disturbancies

IEC/EN

61000-4-6

+i/–i

AM modulated

50 Ω

0.15...80 MHz

yes

A

B

(140 dBµV) 80%, 1 kHz

150 Ω

Transient

ETR 283

(19 Pfl 1) ⁴

150 V_p0.1/0.3 ms

limited to

<100 A

3 positive

¹Related and previous standards are referenced in: Technical Information: Standards.

²i = input, o = output.

³A = normal operation, no deviation from specification, B = temporary deviation from specs. possibe.

⁴For 40 IMX 35 types (additional external components required). Not applicable for 20 IMX 35 types.

⁵External components required.

Electromagnetic Emission

[dBµV]

90

07020

[dBµV/m]

50

07108

80

70

60

50

40

30

20

10

0

A

EN 55022 A

EN 55022 B

40

30

20

10

B

[MHz]

0

MHz

Fig. 17

Fig. 18

Typical disturbance voltage (quasi-peak) at the input ac-

cording to CISPR 11/EN 55011 and CISPR 22/EN 55022,

measured at U_{i nom}and I_{o nom}. Output leads 0.1 m, twisted.

(40 IMX 35-D12D12-9)

Typical radio frequency-interference voltage at U_{i nom}

I_{o nom}, measured with an antenna (distance 10 m).

Output leads 1 m, twisted.

,

Edition 1/10.99

13/18

IMX 35 Series

DC-DC Converters <40Watt

Rugged Environment

CISPR 22/EN 55022, Level B Radiated

Electromagnetic emission requirements according to

EN 55022, class B (radiated emmission) can be achieved

by adding an external common mode choke and (for

20 IMX 35 types) an additional capacitor, see: Input Data.

The filter components should be placed as close as possi-

ble to the input of the converter.

Table 13: Input filter components for EN 55022, level B,

radiated.

Type

Current compensated choke

20 IMX 35

40 IMX 35

07114

15

8.5

L

V+

Vi+

Module

V–

Vi–

Fig. 20

Choke dimensions

Fig. 19

Example for external circuitry to comply with CISPR22/EN

55022, level B, radiated

Immunity to Environmental Conditions

Table 14: Temperature specifications, valid for air pressure of 800...1200 hPa (800...1200 mbar)

Temperature

-7

-9

Option -8 ³

Characteristics

Conditions

Operational ²

min

–25

–40

max

71

min

–40

–55

max

71

min

max

85

Unit

T_A

T_C

T_S

Ambient temperature ¹

–40

–55

°C

Case temperature

Storage temperature ¹

95

105

Non operational

100

¹MIL-STD-810D section 501.2 and 502.2

²See: Thermal Considerations

³Start up at –55°C

Table 15: MTBF and device hours

MTBF

Ground Benign

Ground Fixed

Ground Mobile

MTBF acc. to MIL-HDBK-217F

40 IMX 35

T_C= 40°C

T_C= 70°C

T_C= 50°C

h

Table 16: Mechanical stress

Test Method

Standard

Test Conditions

Status

Ca

Ea

Eb

Fc

Damp heat

steady state

IEC/DIN IEC 60068-2-3

MIL-STD-810D section 507.2 Relative humidity:

Duration:

Temperature:

40 ^±2°C

%

56 days

Unit not

operating

93 ^+2/-3

Shock

(half-sinusoidal)

IEC/EN/DIN EN 60068-2-27

MIL-STD-810D section 516.3 Bump duration:

Number of bumps:

Acceleration amplitude:

100 g_n= 981 m/s²

6 ms

18 (3 each direction)

Unit

operating

Bump

(half-sinusoidal)

IEC/EN/DIN EN 60068-2-29

MIL-STD-810D section 516.3 Bump duration:

Number of bumps:

Acceleration amplitude:

40 g_n= 392 m/s²

6 ms

6000 (1000 each direction)

Unit

operating

Vibration

(sinusoidal)

IEC/EN/DIN EN 60068-2-6

MIL-STD-810D section 514.3

Acceleration amplitude:

0.35 mm (10...60 Hz)

5 g_n= 49 m/s²(60...2000 Hz) operating

10...2000 Hz

Unit

Frequency (1 Oct/min):

Test duration:

7.5 h (2.5 h each axis)

Fda Random vibration IEC 60068-2-35

Acceleration spectral density: 0.05 g_n²/Hz

Unit

wide band

reproducibility

high

Frequency band:

Acceleration magnitude:

Test duration:

20...500 Hz

4.9 g_{n rms}

3 h (1 h each axis)

operating

Kb

Salt mist, cyclic

(sodium chloride

NaCl solution)

IEC/EN/DIN IEC 60068-2-52 Concentration:

5% (30°C)

Unit not

operating

Duration:

Storage:

Storage duration:

Number of cycles:

2 h per cycle

40°C, 93% rel. humidity

22 h per cycle

3

Edition 1/10.99

14/18

Rugged Environment

DC-DC Converters <40 Watt

IMX 35 Series

Mechanical Data

Dimensions in mm. Tolerances ±0.3 mm unless otherwise indicated.

European

Projection

09121

09123

0.8 x 0.8

thread M3

0.8 x 0.8

63.5

72.8

63.5

69.6

76.2

Fig. 22

Case IMX 35 open frame (option Z)

Weight: 43 g

Fig. 21

Case IMX 35 (Standard)

Weight: 67 g

Edition 1/10.99

15/18

IMX 35 Series

DC-DC Converters <40Watt

Rugged Environment

Safety and Installation Instructions

Table 18: Pin allocation

Installation Instructions

Installation of the DC-DC converters must strictly follow the

national safety regulations in compliance with the enclo-

sure, mounting, creepage, clearance, casualty, markings

and segregation requirements of the end-use application.

Pin No.

Double

output

Triple

output

Quadruple

output

1

2

PUL

Vi–

PUL

Vi–

PUL

Vi–

Connection to the system shall be made via a printed circuit

board with hole diameters of 1.5 mm for the pins.

3

n.c.

4

Vi+

The units should be connected to a secondary circuit.

5

Trim or n.c.

W

n.c.

Trim

W

Check for hazardous voltages before altering any connec-

tions.

6

W

Do not open the module.

7

Ref

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

does not result in a hazardous condition. See also: Safety

of operator accessible output circuit.

8

SD or i

Vo2–

n.c.

SD or i

Vo3–

Vo3+

Vo2+

Vo2–

Vo1–

Trim1

Vo1+

–

SD or i

Vo3–

Vo3+

Vo2+

Vo2–

Vo1–

Vo1+

Vo4+

Vo4–

n.c.

11

12

13

14

15

16

17

18

19

Input Fuse

Vo2+

n.c.

To prevent excessive current flowing through the input sup-

ply line in case of a short-circuit across the converter input

an external fuse should be installed in a non earthed input

supply line. We recommend a fast acting fuse F8.0A for

20 IMX 35 types, F4.8 A for 40 IMX 35 types.

Vo1–

n.c.

Vo1+

Trim1 or n.c.

n.c.

Standards and approvals

All DC-DC converters are pending to be UL recognized ac-

cording to UL 1950, UL recognized for Canada to CAN/

CSA C22.2 No. 950-95 and LGA approved to IEC/EN

60950 standards.

n.c.

09122

11

12

13

14

15

16

17

18

19

The units have been evaluated for:

• Building in

1

2

3

4

5

6

7

8

Bottom

view

• Supplementary insulation input to output, based on their

maximum input voltage (IMX 35 types)

• The use in a pollution degree 2 environment

• Connecting the input to a secondary circuit which is sub-

ject to a maximum transient rating of 1500 V

After approvals the DC-DC converters are subject to manu-

facturing surveillance in accordance with the above men-

tioned UL, CSA, EN and with ISO 9001 standards.

Fig. 23

Pin allocation

Isolation

Protection Degree

The electric strength test is performed as factory test in ac-

cordance with IEC/EN 60950 and UL 1950 and should not

be repeated in the field. Melcher will not honour any guar-

antee claims resulting from electric strength field tests.

The protection degree of the DC-DC converters is IP 30

(not for option Z).

Cleaning Agents

Table 17: Electric strength test voltages

In order to avoid possible damage, any penetration of

cleaning fluids should be prevented, since the power sup-

plies are not hermetically sealed.

Characteristic

Input to output

IMX 35

Output to

output

Unit

Electric strength

test voltage 1 s

1.2

1.5

0.1

0.5

-

kV_rms

kV DC

MΩ

Insulation resistance

at 500 V DC

>100

Partial discharge

extinction voltage

Consult factory

-

kV

Edition 1/10.99

16/18

Rugged Environment

DC-DC Converters <40 Watt

IMX 35 Series

Safety of operator accessible output circuit

IEC/EN 60950 up to a configured output voltage (sum of

nominal voltages if in series or +/– configuration) of 42 V.

If the output circuit of a DC-DC converter is operator acces-

sible, it shall be an SELV circuit according to the IEC/EN

60950 related safety standards

However, it is the sole responsibility of the installer to en-

sure the compliance with the relevant and applicable safety

regulations. More information is given in: Technical Infor-

mation: Safety.

The following table shows some possible installation con-

figurations, compliance with which causes the output circuit

of the DC-DC converter to be an SELV circuit according to

Table 19: Insulation concept leading to an SELV output circuit

Conditions Front end

DC-DC converter

Type Measures to achieve the

Result

Supply

voltage

Minimum required grade

of isolation, to be provided DC output safety status of the

Maximum Minimum required

Safety status of

specified safety status of the DC-DC

by the AC-DC front end,

including mains supplied

battery charger

voltage

from the

front end ¹

front end output

circuit

the output circuit

converter output

circuit

Mains

≤250 V AC

Basic

≤60 V

≤75 V

≤60 V

≤75 V

Earthed SELV circuit ²IMX 35 Operational insulation

(provided by the DC-DC

SELV circuit

converter)

Hazardous voltage

secondary circuit

IMX 35 Input fuse ³output sup-

pressor diodes ⁴, and

Earthed SELV

circuit

2

earthed output circuit

Double or reinforced

SELV circuit

IMX 35 Operational insulation

(provided by the DC-DC

converter)

Double or reinforced

insulated unearthed

hazardous voltage

secondary circuit ⁵

IMX 35 Supplementary insulation

based on the maximum

rated output voltage from

the front end (provided by

the DC-DC converter)

¹The front end output voltage should match the specified input voltage range of the DC-DC converter.

²The earth connection has to be provided by the installer according to the relevant safety standard, e.g. IEC/EN 60950.

³The installer shall provide an approved fuse (type with the lowest rating suitable for the application) in a non-earthed input conductor

directly at the input of the DC-DC converter (see fig.: Schematic safety concept). For UL’s purpose, the fuse needs to be UL-listed.