20IMX15-05-05-7R_技术文档

Rugged Environment

DC-DC Converters <40 Watt

IMX/IMY 15 Series

15 Watt DC-DC Converters

IMX 15 Series

IMY 15 Series

Input to output electric strength test up to 4 kV DC

Input voltage: 8.4...36, 16.8...75, 50...150 V DC

Single, dual and double outputs

Configurable output voltages from 3.3 to 48 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

• High efficiency (typ. 87%)

10.5

0.42"

40.6

1.5"

51

2.0"

• Input undervoltage lock-out

• Shut down input, output voltages adjustable

• Flex power: Flexible load distribution on outputs

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

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

• Thermal protection

• 2" × 1.6" case with 10.5 mm profile

• Supplementary insulation: 20/40 IMX 15 types

• Double or reinforced insulation: 110 IMY 15 types

Safety according to IEC/EN 60950, UL 1950

LGA

1

Approvals pending

¹For 110 IMY 15 types

Summary

40 IMX 15 types provide SELV outputs even if the bus volt-

age at the converter input exceeds the SELV-limit of

60 V DC. The 110 IMY 15 types provide double insulation

and are CE marked. They may be connected to e.g. a recti-

fied 110 V AC source without any further isolation barrier.

The IMX 15 and IMY 15 series of board mountable 15 Watt

DC-DC converters has been designed according to the lat-

est industry requirements and standards. The converters

are particularly suitable for use in mobile or stationary appli-

cations in transport, railways, industry, or telecommunica-

tion where variable input voltages or high transient voltages

are prevalent.

The circuit comprises of integrated planar magnetics and

all components are automatically assembled and solidly

soldered onto a single PCB without any wire connection.

Magnetic feedback ensures maximum reliability and re-

peatability in the control loop over all operating conditions.

Careful considerations 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 71°C in free air without using any potting material. For

extremely high vibration environments the case has holes

for screw mounting. Various options as e.g. extended tem-

perature range –40...85°C or an alternative pinout provide

a high level of application specific engineering and design-

in flexibility.

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

with 3 different types, the units are available with single,

dual and electrically isolated double outputs from 3.3 up to

48 V externally adjustable, with flexible load distribution on

dual and double output units. A shut down input allows re-

mote converter on-off. Features include consistently high

efficiency over the entire input voltage range, high reliability

and excellent dynamic response to load and line changes.

The converters are designed 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 20 IMX 15 and 40 IMX 15 types provide sup-

plementary insulation. Connected to a secondary circuit the

Table of Contents

Page

Auxilliary Functions ........................................................ 10

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

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

Mechanical Data ............................................................ 13

Safety and Installation Instructions ................................ 14

Description of Option...................................................... 16

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

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

Type Key and Product Marking ........................................ 2

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

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

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

Edition 6/7.99

1/16

MELCHER

The Power Partners.

IMX/IMY 15 Series

DC-DC Converters <40Watt

Rugged Environment

Type Survey and Key Data

Table 1: Type survey

Output 1

Output 2

Output

power

P_{o nom}[W]

Input voltage

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

[V DC]

Efficiency

h_typ

Type designation

Options ²

1

U_{o nom}

I_{o nom}

[A]

U_{o nom}

I_{o nom}

[A]

[V DC]

[%]

3.3

4.5

-

14.9

8.4...36

16.8...75 ³

50...150 ⁴

85

84

20 IMX 15-03-9RG

40 IMX 15-03-9RG

110 IMY 15-03-9RG

-9, -8, i

5.1

3.5

-

17.8

8.4...36

16.8...75 ³

50...150 ⁴

87

86

20 IMX 15-05-9RG

40 IMX 15-05-9RG

110 IMY 15-05-9RG

-9, -8, i

5.1

2.3

2.5

-

11.7

12.8

8.4...36

16.8...75 ³

50...150 ⁴

85

83

20 IMX 15-05-7R

40 IMX 15-05-7R

110 IMY 15-05-7R

-9, -8, i

5.1

1.35

1.5

3.3

1.35

1.5

11.3

12.6

8.4...36

16.8...75 ³

50...150 ⁴

84

82

20 IMX 15-0503-7R

40 IMX 15-0503-7R

110 IMY 15-0503-7R

-9, -8, i

5

1.3

1.4

5

1.3

1.4

13.0

14.0

8.4...36

16.8...75 ³

50...150 ⁴

86

20 IMX 15-05-05-7

40 IMX 15-05-05-7

110 IMY 15-05-05-7

-9, -8, R, K, i

-9, -8, R, i

12

0.65

0.7

12

0.65

0.7

15.6

16.8

8.4...36

16.8...75 ³

50...150 ⁴

88

87

20 IMX 15-12-12-7

40 IMX 15-12-12-7

110 IMY 15-12-12-7

-9, -8, R, K, i

-9, -8, R, i

15

0.5

0.56

15

0.5

0.56

15.0

16.8

8.4...36

16.8...75 ³

50...150 ⁴

88

87

20 IMX 15-15-15-7

40 IMX 15-15-15-7

110 IMY 15-15-15-7

-9, -8, R, K, i

-9, -8, R, i

24

0.32

0.35

24

0.32

0.35

15.4

16.8

8.4...36

16.8...75 ³

50...150 ⁴

86

20 IMX 15-24-24-7

40 IMX 15-24-24-7

110 IMY 15-24-24-7

-9, -8, R, K, i

-9, -8, R, i

¹Flexible load distribution on dual and double outputs possible up to 75% of the total output power P_{o nom}on one of the 2 outputs.

IMX/IMY 15-0503 types have reduced load distribution flexibility; 1.8 A max. on one of the 2 outputs. The other output should not ex-

ceed the difference to the total output power P_{o nom}

²See: Description of Options.

.

³Short-time operation down to U_{i min}≥14.4 V possible. P_oreduced to approx. 85% of rated output power.

⁴Short-time operation down to U_{i min}≥43.2 V possible. P_oreduced to approx. 85% of rated output power.

Type Key and Product Marking

20 IMX 15 - 05 - 05 -7 R G K i

Input voltage range U_i

8.4...36 V DC ........................................... 20

16.8...75 V DC ........................................... 40

50...150 V DC ......................................... 110

Series ......................................................... IMX 15, IMY 15

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

Dash designates double output unit with two

independent electrically isolated outputs ...... - ¹

Output voltage type output 2 .................. 03, 05, 12, 15, 24

Operating ambient temperature range T_A

–25...71°C (standard) ................................. -7

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

–40...85°C (option) ..................................... -8 ²

Options and features:

R input and magnetic feedback .................. R ^{2 3}

Synchronous rectification............................ G

Alternative pinout .........................................K ^{2 4}

Inhibit ............................................................ i ^{2 5}

¹Not applicable with option K or -0503- types. ²For delivery lead times contact factory. Some types require a minimum order quantity.

³Standard features for single output and -0503- types. Optional for double output units. Excludes option K.

⁴Option K excludes option R. ⁵Option inhibit excludes shut down and option K.

Edition 6/7.99

MELCHER

2/16

The Power Partners.

Rugged Environment

DC-DC Converters <40 Watt

IMX/IMY 15 Series

Examples: 20 IMX 15-05-05-7: DC-DC converter, input voltage range 8.4...36 V, 2 electrically isolated outputs each pro-

viding 5 V, 1.3 A.

110 IMY 15-0503-7R: DC-DC converter, input voltage range 50...150 V, 2 outputs with common return provid-

ing +5.1 V, 1.5 A and +3.3 V, 1.5 A. Unit fitted with magnetic feedback for tight output voltage regulation.

Product Marking

Basic type designation, output voltages and currents, applicable safety approval and recognition marks, Melcher patent

nos. and company logo. Date code and serial no.

Functional Description

The IMX/IMY 15 series of DC-DC converters are magnetic

feed-back controlled flyback converters using current mode

PWM (Pulse Width Modulation). The -05- and -0503- output

voltage versions as well as all double output versions fitted

with option R feature an active magnetic feedback loop via

a pulse transformer which results in very tight regulation of

the output voltage (see fig.: Block diagram, single output

types, -0503- types and double output types with option R).

The output voltages of these versions can be adjusted via

the R input. The R input is referenced to the secondary side

and allows for programming of the output voltages in the

range of approximately 80 to 105% of U_{o nom}using either an

external resistor or an external voltage source.

diagram, for double output types). The output voltages can

be adjusted via the Trim input. The Trim input is referenced

to the primary side of the converter and allows for program-

ming of the output voltages in the range 100 to 105% of

U_{o nom}by an external resistor or within 75 to 105% using an

external voltage source. The load regulation output charac-

teristic allows for paralleling of one or several double output

units with equal output voltages.

Current limitation is provided by the primary circuit, thus

limiting the total output power of double output types. The

shut down input allows remote converter on/off.

Overtemperature protection will shut down the unit in ex-

cessive overload conditions with automatic restart approxi-

mately every 50 to 60 ms.

The voltage regulation on the dual and double output ver-

sions without option R is achieved with a passive trans-

former feedback from the main transformer (see fig.: Block

03089

03039

1

3

Vi+

Vo+

1

13

Vo1+

PWM

4

3

SD

15

11

Go

PWM

5

Vo–

Vo2+

n.c.

2 × 2200 pF

1500 V

2

Vi–

2

12

17

Go

R

2 × 2200 pF

Fig. 1

Block diagram, single output types

03088

Fig. 3

Block diagram, -0503- types.

Vi+

1

11

Vo+

Go

4

3

SD

PWM

13

Trim

Vi–

2

15

17

Vo–

n.c.

2 × 2200 pF

Fig. 2

Block diagram, dual output types, alternative K-pinout.

Edition 6/7.99

3/16

MELCHER

The Power Partners.

IMX/IMY 15 Series

DC-DC Converters <40Watt

Rugged Environment

03092

03090

Vi+

1

11

13

Vo1+

4

3

4

3

SD

12

13

12

11

Vo1–

PWM

Vo2+

Trim

n.c.

Vi–

2

15

17

2

15

17

Vo2–

n.c.

2 × 2200 pF

Fig. 4

Block diagram, double output types, standard pinout.

R

Fig. 5

Block diagram, double output types with option R.

Electrical Input Data

General conditions:

– T_A= 25°C, unless T_Cis specified.

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

– Trim or R input not connected.

Table 2: Input Data

Input

20 IMX

40 IMX

110 IMY

Characteristics

Conditions

min typ max

Unit

U_i

Input voltage range ¹

T_{A min}...T_Amax

I_o= 0...I_{o nom}

8.4 ⁵

36 16.8 ^{5 6}

75

40

50 ^{5 7}

150

V DC

U_{i nom}

U_{i sur}

t_{start up}

Nominal input voltage

20

110

9

Repetitive surge voltage

Abs. max input (3 s)

40

100

168

Converter

start-up time ²

Switch on

SD high

Worst case condition at

U_{i min}and full load

0.25 0.5

s

0.1

5

0.1

5

0.1

5

t_rise

Rise time ²

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}

ms

mA

10

20

40

30

8

10

20

30

9

10

20

10

20

10

I_{i o}

No load input current

Reflected ripple current

Inrush peak current ³

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

0.35

µF

U_SD

Shut down voltage

–10...0.7

V DC

open or 2...20

approx. 10

6

open or 2...20

approx. 10

3

open or 2...20

approx. 10

1

R_SD

I_SD

Shut down input resistance For current calculations

kΩ

Input current if unit

shut down

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

mA

f_s

Switching frequency

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

EN 55022 ⁴

approx. 300

B ⁸

approx. 300

B

approx. 300

B

kHz

u_{i RFI}

Input RFI levelconducted

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

U_{i min}will be proportionately increased.

²Measured with resistive and max. admissible capacitive load.

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

⁴Measured with a lead length of 0.1 m, leads twisted. Double output units with both outputs in parallel.

⁵Input undervoltage lock-out at typ. 80% of U_{i min}

.

⁶Short time operation down to U_{i min}>14.4 V possible. P_oreduced to approx. 85% of P_{o nom}

⁷Short time operation down to U_{i min}>43.2 V possible. P_oreduced to approx. 85% of P_{o nom}

.

⁸20 IMX 15 types require 4.7 µF/50 V capacitance accross the input (Polyester, Philips 372 series).

⁹See: Transient ETR 283 (19Pfl1), Electromagnetic Immunity.

Edition 6/7.99

MELCHER

4/16

The Power Partners.

Rugged Environment

DC-DC Converters <40 Watt

IMX/IMY 15 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 5: 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 15

40 IMX 15

110 IMY 15

40

1500

600

22

9.7

0.5

100

167

1

t [µs]

0

20

50 60 70 80 90 100

10

30 40

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.

Fig. 6

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

(40 IMX 15). Source impedance according to

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

.

04008

U_o

t_rise

Note: The suppressor diode D is only necessary for

20 IMX 15 types.

U_{o nom}

Table 6: Components for external circuitry for IEC/EN

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

Type

Inductor (L)

68 µH, 2.7 A

Capacitor (C)

330 µF, 63 V

Diode (D)

20 IMX

40 IMX

110 IMY

1.5 k E47A

t

t_{start up}

220 µH, 1.3 A

330 µH, 0.43 A

2 × 100 µF, 100 V

2 × 100 µF, 200 V

-

Fig. 7

Converter start-up and rise time

04036

L

Input Undervoltage Lockout

Vi+

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.

+

C

D

Vi–

Table 3: Turn on and turn off voltage

Fig. 8

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 15 types.

Type

Turn On

7.5...8

Turn Off

7...7.5

Units

V

20 IMX

40 IMX

110 IMY

12.5...13.5

40...42.5

12...13

10

5

38...40.5

Reverse Polarity Protection

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.

Fig. 9

Dimensions of inductor L for 110 IMY 15 types

(e.g. TOKO 494LYF-0098K).

22

Table 4: Recommended external fuses

Converter type

20 IMX 15

Fuse type

F4.0A

04052

11.5

23.8

40 IMX 15

F2.0A

Fig. 10

110 IMY 15

F1.0A

Dimensions of inductor L for 20 IMX 15 and 40 IMX 15

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

Edition 6/7.99

5/16

MELCHER

The Power Partners.

IMX/IMY 15 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 7a: Output data for single output units and -0503- types.

Output

3.3 V (RG)

5.1 V

5.1 V (RG)

5.1/3.3 V

Characteristics

Conditions

min typ max min typ max min typ max min typ max

Unit

U_o1

U_o2

Output voltage

U_{i nom}

I_o= 0.5 I_{o nom}

3.28

3.32 5.07

5.13 5.07

5.13

5.0

3.13

5.12 V DC

3.46

I_{o nom}Output current ¹

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

4.5

2.3

2.5

3.5

2 × 1.35

2 × 1.5

2.7

A

40 IMX/110 IMY

I_o1L

I_o2L

Current limit ^{2, 4}

20 IMX U_{i nom}, T_C= 25°C

6.0

±1

3.2

3.6

±1

4.6

±1

U_o1<4.75 V

3.8

I_o1L

I_o2L

40 IMX/110 IMY

2.9

4.0

DU_{o U}Line/load regulation

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

I_o= (0.05...1) • I_{o nom}

,

%

5.1 V U_{i nom}

+3, –5

±4.5

80

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

3.3 V

5

6

u_o1/2

Output voltage noise

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

I_o= I_{o nom}

100

60

70

40

100

60

mV_pp

40

U_{o L}

Output overvoltage limit. ⁷

115

130

4000

±250

1

115

130

4000

±250

1

115

130

4000

±250

1

115

130

%

µF

mV

ms

C_{o ext}Admissible capacitive load

total: 4000 ³

u_{o d}

t_d

Dynamic

load

Voltage deviat. U_{i nom}

_{o nom}↔ ¹/

I_{o nom}

±150

I

2

Recovery time

1

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

±0.02 %/K

¹Flexible load distribution: 20 IMX 15-0503-7; 1.6 A max. and 40 IMX 15/110 IMY 15-0503-7 types; 1.8 A max. on one of the 2 outputs,

the other output should not be loaded such that the total output power exceeds P_{o nom}according to table: Type survey.

²The 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 ).

³For -0503- types: total capacitance, of both outputs.

⁴Conditions for specified output. Other output loaded with constant current I_o= 0.5 I_{o nom}

⁵BW = 20 MHz

.

⁶Measured with a probe according to EN 61204

⁷The overvoltage protection is via a primary side second regulation loop. It is not tracking with R control

Edition 6/7.99

MELCHER

6/16

The Power Partners.

Rugged Environment

DC-DC Converters <40 Watt

IMX/IMY 15 Series

Table 7b: Output data for dual and double output units.

Output

2 × 5 V

2 × 12 V

2 × 15 V

2 × 24 V

Characteristics

Conditions

min typ max min typ max min typ max 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 11.90

5.06 11.88

12.10 14.88

12.12 14.85

15.12 23.80

15.15 23.75

24.20 V DC

24.25

I_{o nom}Output current ¹

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

2 × 1.3

2 × 1.4

3.0

2 × 0.65

2 × 0.70

1.6

2 × 0.50

2 × 0.56

1.3

2 × 0.32

2 × 0.35

0.85

A

40 IMX/110 IMY

Current limit ^{2, 4}

20 IMX U_{i nom}, T_C= 25°C

40 IMX/110 IMY U_o= 93% U_{o nom}

I_oL

3.2

±1

±3

1.7

±1

±3

1.4

±1

±3

0.90

±1

DU_{o U}Line regulation

DU_{o l}Load regulation

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

%

U_{i nom}

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

±3

5

u_o1/2

Output voltage noise

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

I_o= I_{o nom}

80

40

120

60

150

70

240 mV_pp

120

6

U_{o L}

Output overvoltage limit. ⁷

Min. load 1%

115

130

4000

±250

1

115

130

620

±300

1

115

130

470

±300

1

115

130

180

±600

1

%

µF

C_{o ext}Admissible capacitive load ³

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

a_Uo

Temperature coefficient

DU_o/DT_C

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

I_o= 0...I_{o max}

±0.02

±0.02 %/K

Table 7c: Output data for double output units fitted with option R.

Output

2 × 5 V

2 × 12 V

2 × 15 V

2 × 24 V

Characteristics

Conditions

min typ max min typ max min typ max min typ max

Unit

U_o1

U_o2

Output voltage

U_{i nom}

I_o= 0.5 I_{o nom}

4.96

4.95

5.04 11.94

5.05 11.90

12.06 14.92

12.10 14.88

15.08 23.88

15.12 23.80

24.12 V DC

24.20

I_{o nom}Output current ^{1, 8}20 IMX U_{i min}...U_{i max}

40 IMX/110 IMY

2 × 1.3

2 × 1.4

3.0

2 × 0.65

2 × 0.70

1.6

2 × 0.50

2 × 0.56

1.3

2 × 0.32

2 × 0.35

0.85

A

I_oL

Current limit ^{2, 4}

20 IMX U_{i nom}, T_C= 25°C

40 IMX/110 IMY U_o= 93% U_{o nom}

3.2

±1

1.7

±1

1.4

±1

0.90

±1

DU_{o U}Line regulation

DU_{o l}Load regulation

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

%

U_{i nom}

±1

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

5

u_o1/2

Output voltage noise

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

I_o= I_{o nom}

80

40

120

60

150

70

240 mV_pp

120

6

U_{o L}

Output overvoltage limit. ⁷

Min. load 1%

115

130

4000

±250

1

115

130

620

±300

1

115

130

470

±300

1

115

130

180

±600

1

%

µF

C_{o ext}Admissible capacitive load ³

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

a_Uo

Temperature coefficient

DU_o/DT_C

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

I_o= 0...I_{o max}

±0.02

±0.02 %/K

¹Flexible load distribution: With double or dual output units each output is capable of delivering 75% of the total output power.

The other output should not be loaded such that the total output power exceeds P_{o nom}according to table: Type survey.

²The 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).

³Measured with both outputs connected in parallel.

⁴Conditions for specified output. Other output loaded with constant current I_o= 0.5 I_{o nom}

⁵BW = 20 MHz

.

⁶Measured with a probe according to EN 61204

⁷The overvoltage protection is via a primary side second regulation loop, not tracking with Trim control.

⁸Minimum load of 10% on output 1 recommended to prevent the two output voltages to drop in unbalanced load conditions.

Edition 6/7.99

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DC-DC Converters <40Watt

Rugged Environment

Thermal Considerations

outputs track each other the protection diode is only pro-

vided in one of the outputs. The main purpose of this fea-

ture is to protect against possible overvoltages which could

occur due to a failure in the feedback control circuit. The

output overvoltage protection is not designed to withstand

externally applied overvoltages.

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 surfaces and the 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.

Overtemperature Protection

The converters are protected from possible overheating by

means of an internal temperature monitoring circuit. It shuts

down the unit above the internal temperature limit and at-

tempts to automatically restart every 50 to 60 ms. This fea-

ture prevents from excessive internal temperature building

up which could occur in heavy overload conditions.

Short Circuit Behaviour

The current limit characteristic shuts down the converter

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

protecting and automatically recovers after removal of the

overload condition (hiccup mode).

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.

Connection in Series

The outputs of one or several single or double output units

can be connected in series without any precautions, taking

into consideration that the highest output voltage should

remain below 42 V to ensure that the output remains SELV.

Output Overvoltage Protection

The output of single output units as well as -0503- and

-05-05- types are protected against overvoltages by a sec-

ond control loop. In the event of an overvoltage on one of

the outputs the unit will shut down and attempt to restart

approximately every 50 to 60 ms. Double and dual output

units (with exception of the -0503- and -05-05- types) are

protected against overvoltages by a Zener diode across the

second output. Under worst case conditions the Zener di-

ode will short circuit. Since with double output units both

Connection in Parallel

The outputs of one or several double output units (except

-0503- types) with equal nominal output voltage can be

connected in parallel. Approximate current sharing be-

tween 2 or several units is ensured by their load dependent

output characteristic. The two outputs of a double output

unit fitted with option R can be connected in parallel to

configure a single output with tight regulation at full load.

Typical Performance Curves

General conditions:

– T_A= 25^oC, unless T_Cis specified.

– Shut down pin left open circuit.

– Trim or R input not connected.

U_o[V]

05019

05020

13

5.5

12

11

10

9

5.0

4.5

4.0

3.5

3.0

8

7

I_{o total}[A]

0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8

0

0.4

1.2 1.6 2.0 2.4 2.8 3.2 3.6 4.0 I_o[A]

0.8

Fig. 12

Fig. 11

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

(110 IMY 15-05-7R)

U_oversus I_o(typ) of double output units (2 × 12 V), with

both outputs in parallel. (110 IMY 15-12-12-7)

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IMX/IMY 15 Series

U_o1[V]

13.5

U_o1, U_o2[V]

05021

05039

14

13

12

11

10

13.0

I_o2= 0.035 A

12.5

U_o2

U_o1

12.0

I_o2= 0.35 A

11.5

I_o1

I_{o1 nom}

11.0

[%]

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. 13

Fig. 17

Cross load regulation U_o1versus I_o1(typ) for various I_o2

(2 × 12 V).

Flexible load distribution on double outputs (2 ¥ 12 V) with

load variation from 0...150% of P_{o1 nom}on output 1.

Output 2 loaded with 50% of P_{o2 nom}

.

U_o[V]

05150

U_o1, U_o2[V]

13

05151

12

11

10

9

14

13

12

11

10

U_o2

U_o1

8

I_o1

I_{o1 nom}

7

[%]

50

75

100

125

150

0

25

I_{o total}[A]

0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8

0

Fig. 14

Fig. 18

U_oversus I_o(typ) of double output units with option R

(2 × 12 V), with both outputs in parallel.

110 IMY 15-12-12-7R.

Flexible load distribution on double outputs with option R

(2 × 12 V) with load variation from 0...150% of P_{o1 nom}on

output 1. Output 2 loaded with 50% of P_{o2 nom}

.

110 IMY 15-12-12-7R.

Note: Minimum load of approx. 10% on output 1 prevents

voltage drop in unballanced load condition.

h [%]

05152

90

U_{i min}

U_{i nom}

h [%]

05153

90

80

70

60

U_{i min}

U_{i max}

80

U_{i nom}

U_{i max}

P_o

100 P_{o total}

70

[%]

25

50

75

Fig. 15

P_o

60

[%]

Efficiency versus input voltage and load. Typical values

40 IMX 15-12-12-7

25

50

75

100 P_{o total}

Fig. 19

Efficiency versus input voltage and load. Typical values

110 IMY 15-12-12-7

05041

U_o[%]

overload short circuit condition

100

switch-off

70

8.5

t [ms]

60.5

Fig. 16

Overload switch off (hiccup mode), typical values.

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DC-DC Converters <40Watt

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Auxilliary Functions

Shut Down Function

Single output units, -0503- types and double output units fit-

ted with option R:

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.

The R input is referenced to the secondary side of the con-

verter. Adjustment of the output voltage is possible by

means of either an external resistor or a voltage source.

Converter operating:

2.0...20 V

a) Adjustment by means of an external resistor R_ext.

Converter shut down: –10...0.7 V

Depending upon the value of the required output voltage,

the resistor shall be connected.

Adjustable Output Voltage

either: Between the R pin and Vo– to achieve an output

voltage adjustment range of approximately

– R input for single output units using synchronous rectifi-

cation (G)

– R input for single output units and -0503- types; optional

for double output units

U_o= 80...100% U_{o nom}

.

U_o

R

_ext1≈ 4 kΩ • –––––––––

U_{o nom}– U_o

or: Between the R pin and Vo+ to achieve an output volt-

– Trim input for double output units

As a standard feature, the single and double output units of-

fer adjustable output voltage(s) by using the control input R

or Trim. If the control input is left open-circuit the output volt-

age is set to U_{o nom}. For output voltages U_o> U_{o nom}, the

minimum input voltage U_{i min}(see: Electrical Input Data) in-

age range of approximately U_o= 100...105% U_{o nom}

.

(U_o– 2.5V)

2.5 V • (U_o/U_{o nom}– 1)

R

_ext2≈ 4 kΩ • ––––––––––––––––––

b) Adjustment by means of an external voltage U_extbe-

tween Vo– and R pins.

creases proportionally to U_o/U_{o nom}

.

The control voltage range is 1.96...2.62 V and allows for

an adjustment in the range of approximately 80...105%

Single output units using synchronous rectification (G):

The R input is referenced to the secondary side of the con-

verter. Adjustment of the output voltage is possible by

means of an external resistor connected between the R pin

and either Vo+ or Vo–.

of U_{o nom}

.

U_o• 2.5 V

_ext≈ –––––––––

U_{o nom}

U

Attempting to adjust the output below this range will

cause the converter to shut down (hiccup mode).

Note: For the units with synchronous rectification U_oad-

justment is different from the standard single output units

and -0503- types.

Note: Applying an external control voltage >2.75 V may

damage the converter.

06131

06029

Vo+

R

Vi+

Vo+

R

R_ext2

R_ext1

U_ref2.5 V

4 kΩ

+

control

circuit

U_ext

R_ext1

R_ext2

–

Vi–

Vo–

Vi–

Vo–

Fig. 20

Fig. 21

Output voltage control for single output units synchronous

rectification.

Output voltage control for single output units, -0503- types

and double output units fitted with option R by means of

the R input.

Table 8: U_oversus U_extapproximate values

Double output units with Trim input:

U_{o nom}

Typ. values of R_ext1

Typ. values of R_ext2

[V]

U_o[% of U_{o nom}

]

R_ext1[kΩ] U_o[% of U_{o nom}R_ext2[kΩ]

]

The Trim input is referenced to the primary side. The figure

below shows the circuit topology. Adjustment 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 volt-

3.3

75

80

90

1.1

2.2

8.2

100

105

110

∞

11

5.1

age source in the range of 75...105% of U_{o nom}

.

5.1

75

80

90

0.47

1.3

3.6

100

105

110

∞

10

5.1

06089

Vi+

Vo1+

Vo1–

Trim

+

Vo2+

Control

circuit

U_ref2.5 V

U_ext

R_ext

Vi–

–

Vo2–

Fig. 22

Output voltage control for double output units by means of

the Trim input.

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DC-DC Converters <40 Watt

IMX/IMY 15 Series

a) Adjustment by means of an external resistor R_ext

:

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

Programming of the output voltage by means of an exter-

nal resistor R_extis possible within a limited range of

100...105% of U_{o nom}. R_extshould be connected between

the Trim pin and Vi–. Connection of R_extto Vi+ may dam-

age the converter. The following table indicates suitable

resistor values for typical output voltages under nominal

conditions (U_{i nom}, I_o= 0.5 I_{o nom}), with either paralleled

outputs or equal load conditions on each outputs.

For external output voltage programming in the range

75...105% of U_{o nom}a (0...20 V) source U_extis required,

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

cates typical U_oversus U_extvalues under nominal condi-

tions (U_{i nom}, I_o= 0.5 I_{o nom}), with either paralleled outputs

or equal load conditions on each output. Applying a con-

trol voltage >20 V will set the converter into a hiccup

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

nected in parallel is feasible.

Table 9a: R_ext1for U_o> U_{o nom}

;

Table 9b: U_oversus U_extfor U_o= 75...105% U_{o nom}

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

;

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

)

U_o[% U_{o nom}

]

R

_ext[kΩ]

U_o[% U_{o nom}

]

U_ext[V]

105...108 (107 typically)

0

≥105

102

95

85

75

0

105

104

103

102

101

100

1.5

5.6

12

27

68

∞

1.6

4.5

9

13

Electromagnetic Compatibility (EMC)

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

fective protection against high input transient voltages

which typically occur in many installations, but especially in

battery driven mobile applications.

Electromagnetic Immunity

Table 10: 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 15 types (additional external components required). Not applicable for 20 IMX 15 types.

⁵External components required.

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IMX/IMY 15 Series

DC-DC Converters <40Watt

Rugged Environment

Electromagnetic Emission

[dBµV]

90

07020

[dBµV/m]

50

07108

80

70

60

50

40

30

20

10

0

A

EN 55022 A

40

B

EN 55022 B

30

20

10

[MHz]

0

MHz

Fig. 23

Fig. 24

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 15-05-7R)

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

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

Output leads 1 m, twisted.

,

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 15 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 11: Input filter components for EN 55022, level B,

radiated.

Type

Current compensated choke

20 IMX 15

40 IMX 15

110 IMY 15

1 mH, 2A

e.g. Tokin, type SC-02-10GS

07114

L

V+

Vi+

15

8.5

Module

V–

Vi–

Fig. 25

Example for external circuitry to comply with CISPR22/EN

55022, level B, radiated

Fig. 26

Choke dimensions

Immunity to Environmental Conditions

Table 12: 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 13: MTBF and device hours

MTBF

Ground Benign

Ground Fixed

Ground Mobile

MTBF acc. to MIL-HDBK-217F

40 IMX 15

T_C= 40°C

T_C= 70°C

T_C= 50°C

h

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Table 14: Mechanical stress

Test Method

Standard

Test Conditions

Status

Ca

Ea

Eb

Fc

Damp heat

steady state

IEC/DIN IEC 60068-2-3

Temperature:

MIL-STD-810D section 507.2 Relative humidity:

Duration:

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)

2

Fda Random vibration IEC 60068-2-35

Acceleration spectral density: 0.05 g_n/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:

Duration:

Storage:

Storage duration:

Number of cycles:

5% (30°C)

Unit not

operating

2 h per cycle

40°C, 93% rel. humidity

22 h per cycle

3

Mechanical Data

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

European

Projection

45.72

09011

11

0.8 x 0.8

1

4

Bottom view

17

Fixing hole for

M2 or KA 22

self tapping screws

>5 10.5

47

50.8

Measuring point of case temperature T_C

Fig. 27

Case IMX 15, IMY 15

Weight: <35 g

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DC-DC Converters <40Watt

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Safety and Installation Instructions

Table 15: 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.

Single

output

-0503-

output

Double

output

Dual

output

option K

1

2

Vi+

Vi–

-

Vi+

Vi–

n.c.

SD

Vi+

Vi–

Vi+

Vi–

-

Connection to the system shall be made via a printed circuit

board with hole diameters of 1.4 mm ±0.1 mm for the pins.

3

Trim

SD

The units should be connected to a secondary circuit.

4

SD

-

SD

Vo+

-

Check for hazardous voltages before altering any connec-

tions.

11

12

13

15

17

Vo2+

Go

Vo1+

Vo1–

Vo2+

Vo2–

n.c./R

-

Do not open the module.

Vo+

Vo–

R

Vo1+

Go

Vo–

n.c.

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.

R

Input Fuse

10005

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 F4.0A for

20 IMX 15 types, F2.0 A for 40 IMX 15 types and a fuse

F1.0A for 110 IMY 15 types.

11

12

13

1

2

3

4

Bottom view

15

17

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.

Fig. 28

Pin allocation

The units have been evaluated for:

• Building in

• Supplementary insulation input to output, based on their

maximum input voltage (IMX 15 types)

• Reinforced insulation input to output, based on their

maximum input voltage (IMY 15 types)

Protection Degree

The protection degree of the DC-DC converters is IP 40.

Cleaning Agents

• 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 (IMX 15

types)

In order to avoid possible damage, any penetration of

cleaning fluids should be prevented, since the power sup-

plies are not hermetically sealed.

• Connecting the input to a primary circuit which is subject

to a maximum transient rating of 2500 V (IMY 15 types)

Isolation

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.

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.

Table 16: Electric strength test voltages

Characteristic

Input to output

Output to Unit

output

IMX 15

IMY 15

Electric strength

test voltage 1 s

1.2

3.0

0.1

0.15

-

kV_rms

kV DC

MΩ

1.5

4.0

Insulation resistance

at 500 V DC

>100

Partial discharge

extinction voltage

Consult factory

-

kV

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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 17: 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

Operational (i.e. there is

≤150 V

Primary

IMY 15 Double or reinforced

insulation, based on

150 V AC and DC (pro-

vided by the DC-DC

converter)

SELV circuit

≤150 V AC no need for electrical iso-

lation between the mains

supply voltage and the

DC-DC converter input

voltage)

Mains

≤250 V AC

Basic

≤60 V

≤75 V

≤150 V

Earthed SELV circuit ²IMX 15 Operational insulation

IMY 15 (provided by the DC-DC

converter)

Hazardous voltage

secondary circuit

IMX 15 Input fuse ³output sup-

pressor diodes ⁴, and

Earthed SELV

circuit

2

earthed output circuit

IMY 15 Supplementary insulation SELV circuit

based on 250 V AC and

double or reinforced

insulation, based on the

maximum rated output

voltage from the front end

(provided by the DC-DC

converter)

Double or reinforced

≤60 V

≤75 V

SELV circuit

IMX 15 Operational insulation

IMY 15 (provided by the DC-DC

converter)

Double or reinforced

insulated unearthed

hazardous voltage

secondary circuit ⁵

IMX 15 Supplementary insulation

based on the maximum

rated output voltage from

the front end (provided by

the DC-DC converter)

≤120 V

≤150 V

TNV-2 circuit

IMY 15 Double or reinforced

insulation, based on the

maximum rated output

voltage from the front end

(provided by the DC-DC

converter)

Double or reinforced

insulated earthed or

unearthed hazardous

voltage secondary

circuit

¹The front end output voltage should match the specified input

voltage range of the DC-DC converter.

10004

Fuse

²The earth connection has to be provided by the installer accord-

ing to the relevant safety standard, e.g. IEC/EN 60950.

³The installer shall provide an approved fuse (type with the low-

est 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. See also: Input Fuse.

+

~

Mains

Suppressor

diode

AC-DC

front

end

DC-DC

con-

verter

Battery

SELV

–

~

Earth

connection

Earth

connection

⁴Each suppressor diode should be dimensioned in such a way,

that in the case of an insulation fault the diode is able to limit the

output voltage to SELV (<60 V) until the input fuse blows (see

fig.: Schematic safety concept).

⁵Has to be insulated from earth by at least basic insulation ac-

cording to the relevant safety standard, based on the maximum

output voltage from the front end.

Fig. 29

Schematic safety concept. Use fuse, suppressor diode

and earth connection as per table Safety concept leading

to an SELV output circuit.

Edition 6/7.99

15/16

MELCHER

The Power Partners.

IMX/IMY 15 Series

DC-DC Converters <40Watt

Rugged Environment

Description of Option

Option -8

Option K

Extended Temperature Range

Alternative Pinout

Extension of the temperature range from standard

–25...71°C to –40...85°C. In the upper temperature range

the output power derating below should be observed. The

modules will provide the specified ouptut power with free air

convection cooling.

Option K configures the electrically isolated double outputs

to the alternative pinout with outputs connected in series

(Vo+/Go/Vo–) and common ground.

However instead of using units with option K, it is recom-

mended to use the standard double output units by provid-

ing the printed circuit board with an additional pin hole (for

pin 12 of double output units) connected to pin hole 13. This

will provide more design-in flexibility since by that both

pinouts may be used on the same PCB.

P_o/P_{o max}

11047

1.2

1.0

0.8

0.6

Option i

Inhibit

Excluces shut down and option K.

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

unit 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).

0.4

0.2

0

–40

T_A[°C]

–20

0

80

20

40

60

Fig. 30

Converter operating:

Converter inhibited

or inhibit pin left open:

–10 V...0.8 V

Maximum allowed output power versus ambient tempera-

ture.

2.4 V...U_{i max}

Option -9

06070

Extended ambient temperature range –40...71°C.

Vi+

Option R

R Input and Magnetic Feedback

i

R specifies magnetic feedback from the output for closer

regulation of the output voltages of double output units. It is

especially suited for applications where the two outputs are

either connected in parallel or in series to form one strong

and tight regulated output. It enables the adjustment of the

output voltages via the R-input on the secondary side by an

external resistor or an external voltage source in the range

of approximative 80...105% of U_{o nom}. Option R excludes

the Trim input (see also table: Pin allocation), option K as

well as the possibility to operate several converters with the

outputs connected in parallel.

Vi–

Fig. 31

If the inhibit is not used the inhibit pin should be con-

nected to Vi–

Edition 6/7.99

16/16

MELCHER

The Power Partners.


型号：	20IMX15-05-05-7R
厂家：	BEL FUSE INC.
描述：	DC-DC Regulated Power Supply Module, 2 Output, 13W, Hybrid 局域网
文件：	总16页 (文件大小：401K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

20IMX15-05-05-7R [BEL]

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