110IMY35D05D05-8

Board Mountable DC-DC Converters 35 Watt DC-DC Converters IMY 35 Series IMY 35 Series Input to output electric strength test up to 2.5 kV DC Input voltage: 60...150 V DC 2, 3 and 4 outputs Configurable output voltages from 5 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 63.5 2.5" 10.5 0.41" 76.2 3" • Shut down input • Output voltages adjustable with flexible load distribution • 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 • Double or reinforced insulation 47.8 1.88" Safety according to IEC/EN 60950, UL 1950 8.9 0.35" 72.8 2.87" LGA Approvals pending Summary The IMY 35 series of board mountable 35 Watt DC-DC converters has been designed according to the latest industry requirements and standards. The converters are particularly suitable for use in mobile or stationary applications in transport, railways, industry, or telecommunication where variable input voltages or high transient voltages are prevalent. With a total input voltage range from 60...150 V, the units are available with double and quadruple outputs, electrically isolated, from 5 V up to 60 V externally adjustable and with flexible load distribution. A shut down input allows remote 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 international safety standards IEC/EN 60950, UL 1950, CAN/ CSA C22.2 No.950-95. LGA, UL and cUL approvals are in progress. Table of Contents Page Summary .......................................................................... 1 Type Survey and Key Data .............................................. 2 Type Key .......................................................................... 2 Functional Description ..................................................... 3 Electrical Input Data ......................................................... 4 Electrical Output Data ...................................................... 6 Edition 2/5.2000 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 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 without using any potting material allows operation 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 provide a high level of application specific engineering and design-in flexibility. Page Auxiliary Functions ........................................................... 9 Electromagnetic Compatibility (EMC) ............................ 10 Immunity to Environmental Conditions .......................... 11 Mechanical Data ............................................................ 12 Safety and Installation Instructions ................................ 13 Description of Option ..................................................... 15 1/15 Board Mountable DC-DC Converters IMY 35 Series Type Survey and Key Data Table 1: Type survey Output 1 Uo nom Io nom [V DC] [A] Output 2 Uo nom Io nom [V DC] [A] Output 3 Uo nom Io nom [V DC] [A] Output 4 Uo nom Io nom [V DC] [A] Input voltage Ui min...Ui max [V DC] Eff. htyp [%] Type designation Trim Opt. 5 2.8 5 2.8 - - - - 60...150 84 110 IMY 35-05-05-9 primary -8, Z, i 12 1.4 12 1.4 - - - - 60...150 86 110 IMY 35-12-12-9 primary -8, Z, i 15 1.2 15 1.2 - - - - 60...150 86 110 IMY 35-15-15-9 primary -8, Z, i 5 1.4 5 1.4 5 1.4 5 1.4 60...150 87 110 IMY 35 D05D05-9 primary -8, Z, i 12 0.7 12 0.7 12 0.7 12 0.7 60...150 89 110 IMY 35 D12D12-9 primary -8, Z, i 15 0.6 15 0.6 15 0.6 15 0.6 60...150 89 110 IMY 35 D15D15-9 primary -8, Z, i Trim The Trim input on the primary side (Trim, pin 5) influences all outputs. Type Key Dual output units 110 IMY 35 - 12 - 12 -9 i Z Input voltage range Ui 60...150 V DC .......................................... 110 Series ...................................................................... IMY 35 Output 1 of double types .................................... 05, 12, 15 Output 2 of double types .................................... 05, 12, 15 Operating ambient temperature range TA –40...71°C (standard) ................................. -9 –40...85°C (option) ..................................... -8 Options: Inhibit ............................................................ i Open frame .................................................. Z Quad output units 110 IMY 35 D05 D05 -9 i Z Input voltage range Ui 60...150 V DC .......................................... 110 Series ...................................................................... IMY 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 TA –40...71°C (standard) ................................. -9 –40...85°C (option) ..................................... -8 Options: Inhibit ............................................................ i Open frame .................................................. Z Edition 2/5.2000 2/15 Board Mountable DC-DC Converters IMY 35 Series Functional Description The IMY 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 two 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 Uo nom is possible via Trim input on the primary side (See: Block diagram, dual output types.) 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 output 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 voltages, 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 Uo 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 overload conditions with automatic restart approximately in short intervals. 03100 Vi+ 4 17 Vo1+ PUL 1 15 Vo1— Trim/n.c. 5 W 6 PWM Ref 7 18 Trim1/n.c. SD 8 12 n.c. Vi— 2 n.c. 3 13 Vo2+ 14 n.c. 11 Vo2— 19 n.c. 16 n.c. Fig. 1 Block diagram 1, double output types 03098 Vi+ 4 16 Vo1+ PUL 1 15 Vo1— Trim 5 W 6 PWM 17 Vo4+ Ref 7 SD 8 18 Vo4— Vi— 2 n.c. 3 13 Vo2+ 14 Vo2— 12 Vo3+ 11 Vo3— 19 n.c. Fig. 2 Block diagram 3, quadruple output types Edition 2/5.2000 3/15 Board Mountable DC-DC Converters IMY 35 Series Electrical Input Data General conditions: – TA = 25°C, unless TC is specified. – Shut down pin left open circuit (not connected). – Trim not connected. Table 2: Input Data Input 110 IMY Characteristics Conditions 1 min typ 2 Ui Input voltage range Ui nom Nominal input voltage TA min...TA max Io = 0...Io nom Ui sur Repetitive surge voltage Abs. max input (3 s) t start up Converter Switch on start-up time 2 SD high Worst case condition at Ui min and full load Rise time 3 Ui nom resist load 5 Io nom capac. load 10 t rise 60 max Unit 150 V DC 110 168 0.25 0.5 s 0.1 ms 20 Ii o No load input current Io = 0, Ui min...Ui max 10 Iirr Reflected ripple current Io = 0...Io nom 20 Iinr p Inrush peak current 4 Ui = Ui nom 10 Ci Input capacitance for surge calculation U SD Shut down voltage Unit shut down R SD Shut down input resistance For current calculations I SD Input current if unit shut down Ui fs Switching frequency Ui min...Ui max, Io = 0...Io nom ui RFI Input RFI level, conducted EN 55022 5 mA A 0.35 µF –10...0.7 V DC approx. 10 kΩ Unit operating 1 2 3 4 5 min...Ui max 1 approx. 220 mA kHz B Ui min will not be as stated if Uo is increased above Uo nom by use of Trim input. If the output voltage is set to a higher value, Ui min will be proportionately increased. Input undervoltage lock-out at typ. 90% of Ui min. Measured with resistive and max. admissible capacitive load. Source impedance according to prETS 300132-2, version 4.3. Measured with a lead length of 0.1 m, leads twisted. Edition 2/5.2000 4/15 Board Mountable DC-DC Converters IMY 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 current. 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. I [A] Table 4: Built-in transient voltage suppressor 04022 Type 4 3 110 IMY 35 2 1 t [µs] 0 20 10 30 40 50 60 70 80 90 100 Fig. 3 Typical inrush current at Ui nom, Po nom versus time. Source impedance according to prETS 300132-2, version 4.3 at Ui nom. Breakdown voltage VBr nom [V] Peak power at 1 ms Pp [W] Peak pulse current Ipp [A] 167 600 0.5 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 similar characteristics as listed in table: Components for external circuitry for IEC/EN 61000-4-5, level 2 or ETR 283 (19Pfl1) compliance. Table 5: Components for external circuitry for IEC/EN 61000-4-5, level 2 or ETR 283 (19Pfl1) compliance. Uo t rise Uo nom 04008 Type 110 IMY 35 Inductor (L) Capacitor (C) L = 560 µH/0.84 A OCR = 0.38 Ω 2 x 100 µF/200 V t t start up 04063 L Vi+ Fig. 4 Converter start-up and rise time C + Vi– Reverse Polarity Protection The built-in suppressor diode also provides for reverse polarity protection at the input by conducting current in the reverse direction. An external fuse is required to limit this current. Fig. 5 Example for external circuitry to comply with IEC/EN 61000-4-5 or ETR 283 (19Pfl1). 22 Table 3: Recommended external fuses Converter type 110 IMY 35 Fuse type F2.0A 04052 11.5 23.8 Fig. 6 Dimensions of inductor L for 110 IMY 35 types (e.g. Coil Craft, PCH-45 series). Edition 2/5.2000 5/15 Board Mountable DC-DC Converters IMY 35 Series Electrical Output Data General conditions: – TA = 25°C, unless TC is specified – Shutdown pin left open circuit (not connected) – R input not connected Table 6: Output data for double output power trains. 2×5V Output Characteristics 3 4 2 × 12 V max min typ 5.05 5.06 11.88 11.86 2 × 15 V max min typ 12.12 12.14 14.85 14.82 max Unit 15.15 15.18 V DC Io nom Output current 2 × 1.4 2 × 0.70 2 × 0.60 IoL Current limit 1 3.7 2.0 1.6 DUo U Line regulation Ui min...Ui max, Io nom ±1 ±1 ±1 DUo l Load regulation Ui nom Io = (0.1...1) Io nom ±3 ±3 ±3 uo1/2 Output voltage noise Ui min...Ui max Io = Io nom 2 80 120 150 3 40 60 70 Uo L Output overvoltage limit. 4 Co ext Admissible capacitive load uo d Dynamic load regulation Ui nom Io = 0.5 Io nom typ Output voltage aUo 2 min Uo1 Uo2 td 1 Conditions Min. load 1% Voltage deviat. Ui nom I ↔ 1/2 Io nom Recovery time o nom Temperature coefficient DUo/DTC Ui min...Ui max Io = 0...Io max 4.95 4.94 115 130 115 130 115 A % mVpp 130 % 4000 470 330 µF ±250 ±400 ±450 mV 1 1 1 ms ±0.02 ±0.02 ±0.02 %/K The 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). BW = 20 MHz Measured with a probe according to EN 61204 The overvoltage protection is via a primary side second regulation loop, not tracking with Trim control. Edition 2/5.2000 6/15 Board Mountable DC-DC Converters IMY 35 Series Thermal Considerations Output Overvoltage Protection If a converter, mounted on a PCB, is located in free, quasistationary air (convection cooling) at the indicated maximum ambient temperature TA max (see table: Temperature specifications) and is operated at its nominal input voltage and output power, the case temperature TC measured at the Measuring point of case temperature TC (see: Mechanical Data) will approach the indicated value TC max after the warm-up phase. However, the relationship between TA and TC depends heavily on the conditions of operation and integration into a system. The thermal conditions are influenced by input voltage, output current, airflow, temperature of surrounding components and the surfaces and properties of the printed circuit board. TA max is therefore only an indicative value and under practical operating conditions, the ambient temperature TA may be higher or lower than this value. The outputs of the converter are protected against overvoltages by a second control loop. In the event of an overvoltage 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 withstand externally applied overvoltages. Caution: The case temperature TC measured at the: Measuring point of case temperature TC (see: Mechanical Data) may under no circumstances exceed the specified maximum value. The installer must ensure that under all operating conditions TC remains within the limits stated in the table: Temperature specifications. Short Circuit Behaviour The current limit characteristic shuts down the converter whenever a short circuit is applied to an output. It acts selfprotecting and automatically recovers after removal of the overload condition (hiccup mode). Overtemperature Protection The converters individual power trains are protected against 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 building up which could occur under heavy overload conditions. Typical Performance Curves General conditions: – TA = 25 oC, unless TC is specified. – Shut down pin left open circuit. – Trim input not connected. Uo [V] 5.0 4.5 4.0 3.5 3.0 0 3 4 5 Io [A] 05020 13 12 11 10 9 8 7 Edition 2/5.2000 2 Uo [V] The outputs of one or several single or double output power trains may be connected in series without any precautions. The outputs of one or several double output power trains (except 3.3 or 5.1 V types) with equal nominal output voltage can be connected in parallel. Approximate current sharing between 2 or several power trains is ensured by their load dependent output characteristic. 1 Fig. 7 Uo versus Io (typ) of units with Uo = 5.1 V. Connection in Series Connection in Parallel 05019 5.5 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 Io total [A] Fig. 8 Uo1/2 versus Io1/2 of double output power trains (i.e. 2 × 12 V). See: Block diagram 1 7/15 Board Mountable DC-DC Converters Uo4 [V] 05164 13.5 IMY 35 Series Uo1, Uo2 [V] 05039 14 13.0 12.5 Io4 = 0.035 A 13 12.0 Io4 = 0.35 A 12 11.5 Uo2 Uo1 11 11.0 0.06 0.10 0.30 0.20 0.40 0.50 0.70 Io1 [A] 0.60 Fig. 9 Cross load regulation Uo4 versus Io1 (typ) for various Io4 for Vo1, Vo4 on power train 1. See: Block diagram dual output types. (IMY 35 D12D12-9) h [%] 05152 90 Ui min Ui nom 10 0 25 50 75 100 125 150 Io1 [%] Io1 nom Fig. 10 Flexible load distribution on power train 1 of IMY 35 D12D12-9 (4 ¥ 12 V) with load variation from 0...150% of Po1 nom on output 1 (Vo1). Output 2 (Vo4) loaded with 50% of Po4 nom. h [%] 90 05153 Ui min 80 80 Ui nom 70 70 60 25 50 Po [%] 100 Po total 75 Fig. 11 Efficiency versus input voltage and load. Typical values IMY 35 D12D12-9 Uo [%] 05041 60 25 50 75 Po [%] 100 Po total Fig. 12 Efficiency versus input voltage and load. Typical values IMY 35 D12D12-9 overload short circuit condition 100 switch-off 70 8.5 t [ms] 60.5 60.5 Fig. 13 Overload switch off (hiccup mode), typical values. Edition 2/5.2000 8/15 Board Mountable DC-DC Converters IMY 35 Series Auxiliary Functions Shut Down Function a) Adjustment by means of an external resistor Rext: 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. Converter operating: Converter shut down: 2.0...20 V –10...0.7 V 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. Table 7: Turn on and turn off voltage Type 110 IMY 35 Trigger level Hysteresis Units 40...42.5 ≤1 V See: Electrical input data for a description of the turn on turn off voltage levels of the various types. 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. Table 8: Typical values for Rext and the respective lockout voltage for input voltage. Rext [kΩ] Umin [V] 27 22 10 26 Rext [kΩ] 0 3.3 6.2 10 18 39 ∞ b) Adjustment by means of an external voltage source Uext. For external output voltage adjustment in the range 80...105% of Uo nom a (0...20 V) source Uext is required, connected to the Trim pin 5 and Vi–. The table below indicates typical Uo versus Uext values. 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. 0 30 Uo [% Uo nom] Uext [V] ≤15.5 ≥105 102 100 95 85 80 0 1.8 2.5 4.25 8.25 10.2 For the dual output types refer to the block diagram 1. The units IMY 35-12-12 and IMY 35-15-15 exhibit a Trim input connected to pin 5. This input influences both outputs simultaneously. Both power trains have passive transformer feedback and the Trim input (pin 5) is referenced to the primary side. Fig. 16 shows the circuit topology. Adjustment of the output voltage is possible by means of either an external resistor Rext in the range of 100...105% of Uo nom or an external voltage source in the range of 80...105% of Uo nom. Trim 4 17 5 15 + Control circuit Uref = 2.5 V Rext Vi– 2 13 11 The quadruple output units are shown in block diagram 3. All types with equal output voltage have the Trim function connected to pin 5 referenced to the primary side which influences all outputs simultaneously. The schematics are shown in fig. 16, the values of the adjust resistor Rext in Table 10 and the external voltage source in Table 11. Synchronisation (W) Vo1– 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 480...540 kHz (duty cycle 10...90%). The external source frequency is internally divided by 2 to define the switching frequency for the converter. If unused, this pin can be connected to V1– (pin 2) or left open-circuit. Vo2+ Reference (Ref) 06137 Vi+ Vo1+ Vo2– Fig. 14 Output voltage control for double output units by means of the Trim input on the primary side. Edition 2/5.2000 Uo [% Uo nom] 105...108 (107 typically) 105 104 103 102 101 100 ∞ As a standard feature, the IMY 35 offer adjustable output voltages in the range 80...105% of Uo nom by use of a control input pin. The Trim control is offered either on primary or secondary side of the converter depending on type. – Table 9: Rext1 for Uo > Uo nom; approximate values (U i nom, Io = 0.5 Io nom) Table 10: Uo versus Uext for Uo = 80...105% Uo nom; typical values (Ui nom, Io = 0.5 Io nom) Adjustable Output Voltage Uext Adjustment of the output voltage by means of an external resistor Rext is possible within the range of 100...105% of Uo nom. Rext should be connected between the Trim pin 5 and Vi–. Connection of Rext to Vi+ may damage the converter. The following table indicates suitable resistor values for typical output voltages under nominal conditions (Ui nom, Io = 0.5 Io nom). This option provides a stable 5 V (±0.2 V) reference signal on pin Ref. It is protected by 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 reference. We recommend to connect a filter capacitor (0.1 µF) between Ref and Vi–, if Vref is used. 9/15 Board Mountable DC-DC Converters IMY 35 Series Electromagnetic Compatibility (EMC) A suppressor diode together with an input filter form an effective protection against high input transient voltages which typically occur in many installations, but especially in battery driven mobile applications. Electromagnetic Immunity Table 11: Immunity type tests Phenomenon Standard 1 Class Level Coupling mode 2 Value applied Waveform Source Imped. Test procedure Electrostatic discharge to case IEC/EN 61000-4-2 2 contact discharge (R pin open) 4000 Vp 1/50 ns 330 Ω yes B 3 air discharge (R pin open) 8000 Vp 10 positive and 10 negative discharges 3 antenna 10 V/m AM 80% 1 kHz 26…1000 MHz yes A PM, 50% duty cycle, 200 Hz resp. frequ. 900 MHz Electromagnetic IEC/EN field 61000-4-3 ENV 50204 1 2 3 4 In Per- 3 oper. form. Electrical fast transient/burst IEC/EN 61000-4-4 4 direct +i/–i 4000 Vp bursts of 5/50 ns 5 kHz rep. rate transients with 15 ms burst duration and a 300 ms period 50 Ω 1 min positive 1 min negative transients per coupling mode yes B Surge IEC/EN 61000-4-5 4 3 +i/–i 2000 Vp 1.2/50 µs 2Ω 5 pos. and 5 neg. impulses per coupling mode yes B Conducted disturbancies IEC/EN 61000-4-6 3 +i/–i 50 Ω 0.15...80 MHz 150 Ω yes A Transient ETR 283 (19 Pfl 1) limited to 100 - MΩ Consult factory - kV Insulation resistance at 500 V DC Partial discharge extinction voltage Edition 2/5.2000 Unit Bottom view 11 12 13 14 15 16 17 18 19 The protection degree of the DC-DC converters is IP 30 (not for option Z). In order to avoid possible damage, any penetration of cleaning fluids should be prevented, since the power supplies are not hermetically sealed. 13/15 Board Mountable DC-DC Converters IMY 35 Series Safety of operator accessible output circuit If the output circuit of a DC-DC converter is operator accessible, it shall be an SELV circuit according to the IEC/EN 60950 related safety standards The following table shows some possible installation configurations, compliance with which causes the output circuit of the DC-DC converter to be an SELV circuit according to IEC/EN 60950 up to a configured output voltage (sum of nominal voltages if in series or +/– configuration) of 42 V. However, it is the sole responsibility of the installer to ensure the compliance with the relevant and applicable safety regulations. More information is given in: Technical Information: Safety. Table 18: Insulation concept leading to an SELV output circuit Conditions Front end Supply voltage Minimum required grade of isolation, to be provided by the AC-DC front end, including mains supplied battery charger Minimum required safety status of the front end output circuit Type Measures to achieve the specified safety status of the output circuit Safety status of the DC-DC converter output circuit Mains Operational (i.e. there is ≤150 V AC no need for electrical isolation between the mains supply voltage and the DC-DC converter input voltage) ≤150 V Primary IMY 35 Double or reinforced insulation, based on 150 V AC and DC (provided by the DC-DC converter) SELV circuit Mains Basic ≤250 V AC ≤60 V Earthed SELV circuit 2 IMY 35 Double or reinforced 2 Result Maximum DC output voltage from the front end 1 ≤150 V 1 DC-DC converter Operational insulation (provided by the DC-DC converter) IMY 35 Supplementary insulation 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) ≤60 V SELV circuit IMY 35 Operational insulation (provided by the DC-DC converter) ≤120 V TNV-2 circuit IMY 35 ≤150 V Double or reinforced insulated earthed or unearthed hazardous voltage secondary circuit Double or reinforced insulation, based on the maximum rated output voltage from the front end (provided by the DC-DC converter) SELV circuit The front end output voltage should match the specified input voltage range of the DC-DC converter. The earth connection has to be provided by the installer according to the relevant safety standard, e.g. IEC/EN 60950. ~ Mains ~ 10004 Fuse AC-DC front end Battery Earth connection + DC-DC converter Suppressor diode SELV – Earth connection Fig. 20 Schematic safety concept. Use fuse, suppressor diode and earth connection as per table: Safety concept leading to an SELV output circuit. Edition 2/5.2000 14/15 Board Mountable DC-DC Converters IMY 35 Series Description of Options Table 19: Survey of options Option Function of option Characteristic -8 Extended operational ambient temperature range TA = –40...85°C Z Open frame All models are available without case i Inhibit - Option -8 Extended Temperature Range Option i Inhibit Extension of the temperature range from standard –40...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. The output 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 8) should be connected to Vi– to enable the output (active low logic, fail safe). Po /Po max Converter operating: Converter inhibited or inhibit pin left open circuit: 11047 1.2 1.0 –10 V...0.8 V 2.4 V...Ui max 06138 0.8 4 Vi+ 0.6 8 i 0.4 0.2 0 –40 2 Vi– –20 0 20 40 60 80 TA [°C] Fig. 21 Maximum allowed output power versus ambient temperature. Edition 2/5.2000 Fig. 22 If the inhibit is not used the inhibit pin should be connected to Vi– 15/15