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Benign Environment
DC-DC Converters <40 W
IMR 6-Family
DC-DC Converters
Input to output isolation test voltage 500 V DC Single or dual output * Input voltage range up to 3:1 * Input filter * High efficiency up to 75 % * * * * Outputs short-circuit-proof No derating 2" x 2" plastic case Low cost
IMR 6-Family
Table of Contents
Page
Type Survey .............................................................. 6 - 79 Description ................................................................ 6 - 79 Safety and Installation Instructions ........................... 6 - 80 Immunity to Environmental Conditions ...................... 6 - 81 Electrical Input and Output Data ............................... 6 - 81 Mechanical Data ....................................................... 6 - 83 Type Key and Product Marking ................................. 6 - 83
Table 1: Type survey
Output
Uo nom
5V 12 V 15 V 5 V 12 V 15 V
Io nom
1000 mA 500 mA 400 mA 500 mA 250 mA 200 mA
Input voltage range Ui 12 IMR 6: 24 IMR 6: 40 IMR 6: 48 IMR 6: 9...18 V DC 18...36 V DC 20...60 V DC 36...72 V DC
Nominal input voltage Ui nom 12 V DC 24 V DC 36 V DC 48 V DC
Input to output isolation Test voltage: 500 V DC min. Resistance: 1000 M min.
Type .. IMR 6-05-2 .. IMR 6-12-2 .. IMR 6-15-2 .. IMR 6-0505-2 .. IMR 6-1212-2 .. IMR 6-1515-2
Description
The IMR 6 family of DC-DC converters have been developed for powering commercial type of electronic circuits, e.g. telephone systems components, industrial controllers and small appliances. They are suitable for applications with standard battery voltages. The IMR 6 converters feature good efficiency and good dynamic response to load changes and at start-up. The IMR 6 modules are short-circuit and no-load proof.
Vi+ Shunt diode, Filter
Vo+
Vi+
Vo+
Shunt diode, Filter
Ref. Control COM
Control Ref.
n.c.
Vi-
Vo-
Vi-
Vo-
Fig. 1: Single output converter block diagram
Fig. 2: Dual output converter block diagram
Edition 2/96 - (c) Melcher AG
MELCHER
The Power Partners.
6 - 79
6.3
Type Survey
IMR 6-Family
DC-DC Converters <40 W
Benign Environment
Safety and Installation Instructions
Safety If the output circuit of a DC-DC converter is operator-accessible according to the IEC 950 related safety standards, it shall be an SELV circuit (Safety Extra Low Voltage circuit, i.e. a circuit, separated from mains by at least basic insulation, that is so designed and protected that under normal and single fault conditions, the voltage between any two conductors and between any conductor and earth does not exceed DC 60 V). In the following section an interpretation is provided of the IEC 950 safety standard with respect to the safety status of the output circuit. However, it is the sole responsibility of the installer or user to assure the compliance with the relevant and applicable safety standards. If the following table is observed, the output of any DC-DC converter is considered to be an SELV.
Table 2: Insulation concept for SELV circuits
Nominal mains supply voltage (AC) 250 V Minimum required grade of isolation, to be provided by the AC-DC front end, including mains supplied battery charger Basic Maximum output voltage from the front end 60 V 72 V Double or reinforced 60 V 72 V Minimum required safety status of the front end output circuit Minimum required grade of isolation between the input and the output of the DC-DC converter, provided by the converter Operational Operational Operational Resulting safety status of the DC-DC converter output circuit SELV circuit 2 Earthed SELV circuit 1 2 SELV circuit
2
Earthed SELV circuit 1 Unearthed hazardous voltage secondary circuit 3 SELV circuit
Double or reinforced insu- Operational lated unearthed hazardous voltage secondary circuit, supplying an SELV circuit 4
1 2
3 4
The earth connection has to be provided by the installer according to the relevant safety standard, e.g. IEC 950. The output has to be protected against overvoltages higher than 60 V by external means, e.g. an overvoltage suppressor diode. Has to be insulated from earth by at least basic insulation according to the relevant safety standard, based on the maximum input voltage of the DC-DC converter. Has to be insulated from earth by double or reinforced insulation according to the relevant safety standard, based on the maximum input voltage of the DC-DC converter.
6.3
Filter recommendations for compliance with EN 55022, class B Electromagnetic emission requirements according to EN 55022, class B can be easely achieved by adding an external input filter consisting of two additional capacitors and current compensated circular choke.
Vi+
The filter components should be placed as close as possible to the input of the converter.
L1 C1
Vi+
C1 L1 C2
Vi-
Ci
IMR 6
IMR 6
C2
Vi-
Fig. 3 Input filter arrangement for 12, 24 and 40 V DC types Table 3: Input filter components
Input voltage 12, 24, 40 V DC
Fig. 4 Input filter arrangement for 48 V DC types
C1
2.2 F 100 V 1 F 1 100 V
C2
2.2 F 100 V 1 F 1 100 V
Type Siemens B 32522 C1225-K Siemens B 32522 C1105-K
L1
2.2 mH
Type Siemens B 82722 A2202-N1 Ticomel SO 17-0.63 -500
Ci
2.2 F 100 V -
Type Siemens B 32522 C1225-K
48 V DC
0.5 mH
1
Only valid for input voltages up to 60 V DC.
6 - 80
MELCHER
The Power Partners.
Edition 2/96 - (c) Melcher AG
Benign Environment
DC-DC Converters <40 W
IMR 6-Family
Connection in Series The outputs of one or more units can be connected in series. No suppressor diodes are required. Melcher, however recommends to protect each individual output with a Zener diode or preferably a suppressor diode, to avoid reverse polarity that may occur if the output voltages do not rise sinultaneously.
Connection in Parallel The outputs of several units can be connected in parallel. However, the use of a single unit with a higher power rating is a better choice, because of uneven power distribution among the outputs connected in parallel. It is recommended to select converters to be connected in parallel with very small output voltage differences at full load (i.e. < 1%). A decoupling diode is not required but recommended.
Immunity to Environmental Conditions
Thermal Considerations
Table 4: Temperature specification
Characteristics Conditions min -10 -10 -25 max 50 80 100 Unit C
TA TC TS
Ambient temperature Case temperature Storage temperature
Ui nom Io = 0...Io nom
Not operational
Table 5: MTBF
Values at specified Case Temperature MTBF according to MIL-HDBK-217F, N2 Ground Benign 40C 3'332'000 Ground Fixed 40C 647'200 Ground Mobile 50C 244'600 h Unit
Electrical Input and Output Data
General condition: - TA = 25C unless otherwise specified.
Table 6a: Input data
Input Characteristics Conditions min 9 12 12 IMR 6 typ max 18 min 18 24 26 1.25 P i nom shunt diode use external fuse mA W 24 IMR 6 typ max 36 Unit V DC
Ui U i nom Ii 0 Ii L Ui rev
Input voltage range Nominal input voltage No load input current Input current limitation response Reverse input voltage protection
TA min...TA max, Io = 0...Io nom
Ui nom , I o = 0 Ui nom , full load Ui = negative or reverse polarity
22 1.25 P i nom shunt diode use external fuse
Table 6b: Input data
Input Characteristics Conditions min 20 38 40 IMR 6 typ max 60 min 36 48 26 1.25 P i nom shunt diode use external fuse mA W 48 IMR 6 typ max 72 Unit V DC
Ui U i nom Ii 0 Ii L U i rev
Input voltage range Nominal input voltage No load input current Input current limitation response Reverse input voltage protection
TA min...TA max, Io = 0...I o nom
Ui nom, Io = 0 Ui nom, full load Ui = negative or reverse polarity
26 1.25 P i nom shunt diode use external fuse
Edition 2/96 - (c) Melcher AG
MELCHER
The Power Partners.
6 - 81
6.3
IMR 6-Family
Table 7a: Output data
Output Characteristics Conditions
DC-DC Converters <40 W
Benign Environment
.. IMR 6-05 min 4.90 1000 100 150 typ max 5.10
.. IMR 6-12 min 11.76 500 100 150 typ max 12.24
.. IMR 6-15 min 14.70 400 100 150 typ max 15.30 Unit V mA mVpp
Uo nom Nominal output voltage Io nom uo
Nominal output current Output voltage noise
Ui nom, I o nom Ui min...Ui max Ui nom I o = 0.2Io nom BW = 20 MHz U i min...U i max I o nom U i nom I o = 0 Io nom U i nom , Io nom
Uo U Uo I uo
Static line regulation Static load regulation Temperature coefficient Switching frequency
1 2 0.02 50 50 2
1 2 0.02 50
1
%
0.02
%/K kHz
fs
Efficiency - 12 IMR 6 types - other types
U i nom , I o nom
63 72
68 72
68 72
%
Table 7b: Output data
Output Characteristics Conditions .. IMR 6-0505 min 4.90 500 100 150 typ max 5.10 .. IMR 6-1212 min 11.76 250 100 150 typ max 12.24 .. IMR 6-1515 min 14.70 200 100 150 typ max 15.30 Unit V mA mVpp
Uo nom Nominal output voltage I o nom uo
Nominal output current Output voltage noise
Ui nom, Io nom Ui min...Ui max Ui nom Io = 0.2I o nom BW = 20 MHz U i min...U i max Io nom U i nom, Io = 0.2I o nom U i nom, I o nom
6.3
Uo U Uo I uo
Static line regulation Static load regulation Temperature coefficient Switching frequency
1 5 0.02 50 50 5
1 5 0.02 50
1
%
0.02
%/K kHz
fs
Efficiency - 12 IMR 6 types - other types
U i nom, I o nom
67 73
70 75
70 75
%
6 - 82
MELCHER
The Power Partners.
Edition 2/96 - (c) Melcher AG
Benign Environment Mechanical Data
DC-DC Converters <40 W
IMR 6-Family
Dimensions in mm. Tolerances 0.3 mm unless otherwise specified.
50.8 min. 5 12 22.86 5.08
European Projection
o1
Vi- 20.32
Vi+ 50.8 Vo+
NC (COM) Vo-
15.24
15.24 10.2 10.2 Bottom view
Type Key 24 IMR 6 - 12 12 -2 Nominal input voltage in volt ................................... 12...48 Blank .................................................................................. Family .......................................................................... IMR Nominal output power in watt ........................................... 6 Nominal output voltage for output 1 in volt ................ 5...15 Nominal output voltage for output 2 in volt ................ 5...15 Operational ambient temperature range ......................... -2
Product Marking Main face: Melcher name, data code on separate label, type of converter, input voltage range and pin assignment.
Edition 2/96 - (c) Melcher AG
MELCHER
The Power Partners.
6 - 83
6.3
Type Key and Product Marking
min. 5
Fig. 5 Case 2"x 2" Weight: 50 g
12
o1

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