IMR 15-Family DC-DC Converters <40 W Benign Environment DC-DC Converters IMR 15-Family Input to output isolation test voltage 500 V DC Single or dual output * Input voltage range 2:1 * Input filter built-in * High efficiency up to 82 % * Short-circuit-proof * No derating * 2"x 2" metal case * Low cost Table of Contents Page Type Survey Table 1: Type survey Output 1 Uo nom Io nom 5V 12 V 15 V 3000 mA 1250 mA 1000 mA 12 V 15 V 625 mA 500 mA Input voltage range Ui 12 IMR 15: 24 IMR 15: 48 IMR 15: 9...18 V DC 18...36 V DC 36...72 V DC 1 Nominal input voltage Ui nom Input to output isolation 12 V DC 24 V DC 48 V DC Test voltage: 500 V DC min. Resistance: 1000 M min. Type .. IMR 15-05-2 .. IMR 15-12-2 .. IMR 15-15-2 .. IMR 15-1212-2 .. IMR 15-1515-2 12 IMR 15: Output current Io nom see "Output Data" Description Vi+ Vo+ Fig. 1: Single output converter block diagram 6 - 84 Vi+ n.c. Control Vi- with standard battery voltages. The IMR 15 converters feature good efficiency and good dynamic response to load changes and at start-up. The IMR 15 modules are short-circuit-proof. Ref. Vo- Vo+ Shunt diode, Filter The IMR 15 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 Shunt diode, Filter 6.3 Type Survey .............................................................. 6 - 84 Description ................................................................ 6 - 84 Safety and Installation Instructions ........................... 6 - 85 Immunity to Environmental Conditions ...................... 6 - 86 Electrical Input and Output Data ............................... 6 - 86 Mechanical Data ....................................................... 6 - 88 Type Key and Product Marking ................................. 6 - 88 Ref. COM Control Vo- Vi- Fig. 2: Dual output converter block diagram MELCHER The Power Partners. Edition 2/96 - (c) Melcher AG Benign Environment DC-DC Converters <40 W IMR 15-Family 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 60 V DC). 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) Minimum required grade of isolation, to be provided by the AC-DC front end, including mains supplied battery charger 250 V Basic Maximum output voltage from the front end Double or reinforced 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 Resulting safety status of the DC-DC converter output circuit 60 V Earthed SELV circuit 1 Operational SELV circuit 2 72 V Unearthed hazardous voltage secondary circuit 3 Operational Earthed SELV circuit 1 2 60 V SELV circuit Operational SELV circuit 72 V Double or reinforced insu- Operational lated unearthed hazardous voltage secondary circuit, supplying an SELV circuit 4 2 1 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. 3 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. 4 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. 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 one current compensated circular double choke. The filter components should be placed as close as possible to the input of the converter. Vi+ Vi+ C1 C1 L1 Ci L1 IMR 15 C2 IMR 15 C2 Vi- Vi- Fig. 3 Input filter arrangement for 12, 24 and 40 V DC types Fig. 4 Input filter arrangement for 48 V DC types Table 3: Input filter components C1 C2 Type L1 Type Ci Type 2.2 F 100 V 2.2 F 100 V Siemens B 32522 C1225-K 2.2 mH Siemens B 82722 A2202-N1 2.2 F 100 V Siemens B 32522 C1225-K 2.2 F 1 100 V 2.2 F 1 100 V Siemens B 32522 C1225-K 2.2 mH Siemens B 82722 A2202-N1 - Input voltage 12, 24, 40 V DC 48 V DC 1 Only valid for input voltages up to 60 V DC. Edition 2/96 - (c) Melcher AG MELCHER The Power Partners. 6 - 85 6.3 2 IMR 15-Family DC-DC Converters <40 W 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 simultaneously. Benign Environment 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 max TA Ambient temperature 50 Case temperature Ui nom Io = 0...Io nom -10 TC -10 80 TS Storage temperature Not operational - 25 100 Unit C Table 5: MTBF Values at specified Case Temperature Ground Benign 6.3 MTBF according to MIL-HDBK-217F, N2 Ground Fixed Ground Mobile 40C 40C 50C 2'932'000 695'900 261'800 Unit h Electrical Input and Output Data General condition: - TA = 25 C unless otherwise specified. Table 6a: Input data Input 12 IMR 15 Characteristics Conditions min Ui Input voltage range TA min... TA max, Io = 0...Io nom Ui nom Nominal input voltage Ii 0 No load input current Ui nom , Io = 0 Ii L Input current limitation response Ui nom , full load Ui rev Reverse input voltage protection Ui = negative or reverse polarity typ 9 24 IMR 15 max min 18 18 typ max Unit 36 V DC 12 24 35 26 mA 1.25 P i nom 1.25 P i nom W shunt diode use external fuse shunt diode use external fuse Table 6b: Input data Input 48 IMR 15 Characteristics Conditions min Ui Input voltage range TA min... TA max , Io = 0... Io nom 36 Ui nom Nominal input voltage Ii 0 No load input current Ui nom , Io = 0 Ii L Input current limitation response Ui nom , full load Ui rev Reverse input voltage protection Ui = negative or reverse polarity 6 - 86 typ max Unit 72 V DC 48 26 mA 1.25 P i nom W shunt diode use external fuse MELCHER The Power Partners. Edition 2/96 - (c) Melcher AG Benign Environment DC-DC Converters <40 W IMR 15-Family Table 7a: Output data Output .. IMR 15-05 Characteristics Conditions min Uo nom Nominal output voltage Ui nom, I o nom 4.90 Io nom typ .. IMR 15-12 max min 5.10 11.76 typ .. IMR 15-15 max min 12.24 14.70 typ max Unit 15.30 V Nominal output current: - 12 IMR 15 types - other types Ui min...Ui max 2000 3000 834 1250 667 1000 mA uo Output voltage noise (BW = 20 MHz) Ui nom I o = 0.2 Io nom 100 240 300 mVpp Uo U Static line regulation U i min...U i max I o nom 1 1 1 Uo I Static load regulation U i nom , I o = 0 Io nom 2 2 2 tr Transient recovery time I o =10.5 Io nom uo Temperature coefficient U i nom , I o nom fs Switching frequency 500 500 0.02 s 500 0.02 % 0.02 %/K 200 200 200 kHz 63 70 65 76 65 78 % .. IMR 15-1212 .. IMR 15-1515 Efficiency - 12 IMR 15 types - other types U i nom , I o nom Table 7b: Output data Characteristics Conditions Uo nom Nominal output voltage Ui nom, Io nom I o nom Nominal output current: - 12 IMR 15 types - other types min typ 11.76 max 12.24 min 417 625 Ui min... Ui max 0.2 I o nom typ 14.70 max 15.30 Unit V 334 500 mA 300 mVpp I o min Minimum output current each output 0.2 I o nom uo Output voltage noise (BW = 20 MHz) Ui nom, Io = 0.2 I o nom Uo U Static line regulation U i min...U i max, Io nom 1 1 U o I Static load regulation U i nom, Io = 0.2 I o nom 5 5 tr Transient recovery time Io =10.5I o nom uo Temperature coefficient U i nom, I o nom fs Switching frequency 240 500 s 500 0.02 % 0.02 %/K 200 200 kHz 73 80 75 80 % Efficiency - 12 IMR 15 types - other types Edition 2/96 - (c) Melcher AG U i nom, I o nom MELCHER The Power Partners. 6 - 87 6.3 Output IMR 15-Family DC-DC Converters <40 W Benign Environment Mechanical Data Dimensions in mm. Tolerances 0.3 mm unless otherwise specified. European Projection 50.8 22.86 5.08 15.24 20.32 Vi- Vi+ NC (COM) Vo- 50.8 12 o1 min. 5 Vo+ 15.24 10.2 10.2 6.3 Fig. 5 Case 2" x 2" Weight: 70 g min. 5 12 Bottom view o1 Type Key and Product Marking Type Key 24 IMR 15 - 12 12 - 2 Nominal input voltage in volt ................................... 12...48 Blank .................................................................................. Family .......................................................................... IMR Nominal output power in watt ......................................... 15 Nominal output voltage for output 1 in volt ................ 5...15 Nominal output voltage for output 2 in volt .............. 12...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. 6 - 88 MELCHER The Power Partners. Edition 2/96 - (c) Melcher AG