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rev. aug 05, 2004 page 1 of 12 www.power-one.com imx4 dc-dc series data sheet 4-watt dc-dc converters input voltage ranges up to 121 v dc 1 or 2 outputs up to 48 v dc up to 2000 vdc i/o electric strength test ? extremely wide input voltage ranges rated to basic isolation electrical isolation, single and dual outputs immunity to iec/en 61000-4-2, -3, -4, -5 and -6 high efficiency (typ. 82%) ? flex power: flexible load distribution no load and short-circuit proof high reliability and no derating operating ambient temperature ?40 to +85 c industrial and alternative pinout dil 24 case with 8.5 mm profile safety according to iec/en 60950, ul 1950 1 1 for 70imx4 types description the imx4 series of board-mountable, 4 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, industry or telecom where variable input voltages or high transient voltages are prevalent. covering a total input voltage range from 8.4 v dc up to 121 v dc with three different types the units are available with single and dual outputs from 3.3 up to 24 v dc with flexible load distribution on dual outputs. features include efficient input and output filtering with unsurpassed transient and surge protection, low output ripple and noise, consistently high efficiency over the entire input voltage range, high reliability as well as excellent dynamic response to load and line changes. the converters exhibit basic insulation and are designed and built according to the international safety standards iec/en 60950, ul 1950, can/csa c22.2 no.950-95 and are lga and ul marked. 70imx4 types have are also ce marked. a special feature is their small case size, dil 24 with only 8.5 mm profile. the circuit comprises integrated planar magnetics and all components are automatically assembled and solidly soldered onto a single pcb without any wire connections. thanks to the rigid mechanical design the units withstand an extremely high level of shock and vibrations. 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 85c in free air without using any potting material. various options as e.g., extended temperature range ?40 to 85c, or k-pinout, an alternative to the standard industrial pinout, provide a high level of application specific engineering and design-in flexibility. table of contents page description ...................................................................................... 1 model selection .............................................................................. 2 part number description ................................................................ 2 functional description .................................................................... 3 electrical input data ....................................................................... 4 electrical output data .................................................................... 6 page electromagnetic compatibility (emc) ................................. 8 mechanical data .................................................................. 9 immunity to environmental conditions ............................. 10 safety and installation instructions .................................... 11 description of options ....................................................... 12 32 1.25" 20 0.8" 8.5 0.34" lga features
rev. aug 05, 2004 page 2 of 12 www.power-one.com imx4 dc-dc series data sheet 4-watt dc-dc converters model selection table 1: model selection output 1 output 2 output po wer input voltage efficiency mode l options 2 v o1 nom i o1 nom v o2 nom i o2 nom p o nom range h typ [v dc] [a] 1 [v dc] [a] 1 [w] [v dc] [%] 3.3 900 - - 3.0 8.4 to 36 79 20imx 4-03-9 -8, z 3.3 900 - - 3.0 16.8 to 75 80 40imx 4-03-9 -8, z 5 700 - - 3.5 8.4 to 36 81 20imx 4-05-9 -8, k, z 5 700 - - 3.5 16.8 to 75 81 40imx 4-05-9 -8, k, z 5 700 - - 3.5 40 to 121 81 70imx4-05-9 -8 12 340 - - 4.1 8.4 to 36 82 20imx 4-12-9 -8, k 12 340 - - 4.1 16.8 to 75 82 40imx 4-12-9 -8, k 12 340 - - 4.1 40 to 121 82 70imx4-12-9 -8 15 280 - - 4.2 8.4 to 36 82 20imx 4-15-9 -8, k 15 280 - - 4.2 16.8 to 75 82 40imx 4-15-9 -8, k 15 280 - - 4.2 40 to 121 82 70imx4-15-8 +5 350 ?5 350 3.5 8.4 to 36 81 20imx4-0505-9 -8, k, z +5 350 ?5 350 3.5 16.8 to 75 81 40imx4-0505-9 -8, k, z +5 350 ?5 350 3.5 40 to 121 81 70imx4-0505-8 +12 170 ?12 170 4.1 8.4 to 36 82 20imx4-1212-9 -8, k, z +12 170 ?12 170 4.1 16.8 to 75 82 40imx4-1212-9 -8, z +15 140 ?15 140 4.2 8.4 to 36 82 20imx4-1515-9 -8, k, z +15 140 ?15 140 4.2 16.8 to 75 82 40imx4-1515-9 -8, k, z +24 80 ?24 80 3.8 8.4 to 36 83 20imx4-2424-9 -8, z +24 80 ?24 80 3.8 16.8 to 75 83 40imx4-2424-9 -8, z 1 flexible load distribution on double outputs possible. 2 not all options/combinations exist; to check if option exists and/or for minimum order quantity and lead time contact power-o ne. part number description 20 imx4 - 05 05 -9 k z input voltage range v i 8.4 to 36 v dc ........................................... 20 16.8 to 75 v dc ......................................... 40 40 to 121 v dc .......................................... 70 series ......................................................................... imx4 output voltage type for output 1 ........... 03, 05, 12, 15, 24 output voltage type for output 2 .................. 05, 12, 15, 24 operating ambient temperature range t a ?40 to 71c ................................................ -9 ?40 to 85c ................................................ -8 options: alternative pinout ......................................... k open frame ................................................. z example: 40imx4-0505-8k: dc-dc converter, input voltage range 16.8 to 75 v, 2 outputs providing 5 v, 350 ma, temperature range ?40 to 85c, alternative pinout.
rev. aug 05, 2004 page 3 of 12 www.power-one.com imx4 dc-dc series data sheet 4-watt dc-dc converters functional description the imx4 dc-dc modules are feedback controlled flyback converters using current mode pwm (pulse width modulation). the converter input is protected against transients by means of a suppressor diode. the output voltage is monitored by a separate transformer winding close to the secondary windings and fed back to the control circuit. current limitation is provided by the primary circuit, thus limiting the total output current ( i o nom for the single and fig. 2 block diagram for dual output types. standard industrial pinout. fig. 1 block diagram for single output types. standard industrial pinout. pwm v i+ v i? vo+ vo? 22 3 14 16 10 23 2 03044 pwm v i+ v i? vo+ vo? go 23 22 2 3 14 16 11 03045 pwm vi+ vi? vo+ vo? 1 24 13 12 2 03046 n .c. pwm v i+ v i? vo+ vo? go 1 24 15 10 13 03047 11 fig. 4 block diagram for dual output types. special pinout (option k). fig. 3 block diagram for single output types. special pinout (option k). i o1 nom + i o2 nom for the dual output types). the close magnetic coupling provided by the planar construction ensures very good regulation and allows for flexible load distribution on dual output types.
rev. aug 05, 2004 page 4 of 12 www.power-one.com imx4 dc-dc series data sheet 4-watt dc-dc converters table 3: input filter components (en 55022) ref. 20imx4 40imx4 70imx4 c 1 4.7 f , 63 v, 2.2 f , 100 v, 2.2 f , 150 v, 85c 85c 85c type ceramic or film electrical input data general conditions: t a = 25c, unless t c is specified. table 2: input data input 20imx4 40imx4 70imx4 characteristics conditions min typ max min typ max min typ max unit v i input voltage range t c min to t c max 8.4 36 16.8 4 75 40 121 v dc v i nom nominal input voltage i o = 0 to i o nom 20 40 70 v i sur repetitive surge voltage abs. max input (3 s) 40 100 150 t start up converter start-up time 1 worst case condition at 0.25 0.5 0.25 0.5 0.25 0.5 s v i min and full load t rise rise time 1 v i nom resistive load 5 5 5 ms i o nom capacitive load 12 12 12 i i o no load input current i o = 0, v i min to v i max 15 20 5 10 5 10 ma c i input capacitance f or surge calculation 0.54 0.3 0.15 f i inr p inrush peak current v i = v i nom 3 3.7 4.2 5.6 a f s switching frequency v i min to v i max , i o = 0 to i o nom approx. 400 approx. 400 approx. 400 khz i i rr reflected ripple current i o = 0 to i o nom 100 60 30 ma pp u i rfi input rfi level en 55022 2 b 1 b 1 a conducted and radiated 1 measured with a resistive or max. admissible capacitive load. (see fig.: converter start-up and rise time ) 2 external filter required. (see: filter recommendations for compliance with en 55022 ) 3 source impedance according to prets 300132-2, version 4.3. 4 operation at lower input voltage possible: p o approx. 80% of p o nom at v i min = 14.4 v fig. 5 converter start-up and rise time 1 a/div. 5 s/div. 04034 0 1 2 3 4 inrush current the inrush current has been kept as low as possible by choosing a very small input capacitance. a series resistor may be inserted in the input line to limit this current further. fig. 6 typical inrush current at v i nom , p o nom versus time (40imx4) measured according to prets 300132-2, version 4.3. reverse polarity protection at input the suppressor diode on the input also provides for reverse polarity protection by conducting current in the reverse direction, thus protecting the unit. an external fuse is required to limit this current: ? for 20imx4 a fast 1 a (f1a) fuse is recommended ? for 40imx4 a fast 0.63 a (f0.63a) fuse is recommended ? for 70imx4 a fast 0.35 a (f035a) fuse is recommended filter recommendations for compliance with en55022 electromagnetic emission requirements according to table input data can be achieved by adding an external capacitor as close as possible to the input terminals. fig. 7 input filter arrangement vi+ vi? c i 04035 v o nom v o t start up t rise t 04008
rev. aug 05, 2004 page 5 of 12 www.power-one.com imx4 dc-dc series data sheet 4-watt dc-dc converters table 5: components for external circuitry (iec/en 61000-4-5) circuit ref. 20imx4 40imx4 70imx4 l 330 h, 0.42 ? , 0.6 a 330 h, 0.42 ? , 0.6 a 330 h, 0.65 ? , 0.62 a tdk tsl1110-331kr55 tdk tsl1110-331kr55 toko, 494lxf-0098k c 68 f, 63 v, 85c 68 f, 100 v, 85c 100 f, 150 v, 85c d motorola 1.5ke 39 a motorola 1.5ke 82 a ? input transient voltage protection in many applications transient voltages on the input of the converter are always a possibility. these may be caused for example by short circuits between vi+ and vi? where the network inductance may cause high energy pulses. in order to protect the converter a large transient voltage suppressor has been fitted to the input of the imx4 types. specifications as on table below. table 4: built-in transient voltage suppressor type breakdown peak power peak pulse voltage at 1 ms current v br nom p p i pp 20imx440 v 600 w 10.3 a 40imx4 100 v 600 w 4.1 a 70imx4 150 v 600 w 2.9 a fig. 9 dimensions for inductor l vi+ vi? c l d + 04036 11.5 5 10.5 5 ? 0.7 0402 9 fig. 8 example for external circuitry to comply with iec/en 61000-4-5, level 2. if transients generating currents above the peak pulse current i pp are possible then an external limiting network such as the circuit recommended for iec/en 61000-4-5 level 2 compliance is necessary. to achieve iec/en 61000-4-5, level 2 compliance an additional transzorb, inductor and capacitor should be provided externally as shown in the figure below. the components should have similar characteristics as listed in the table below. to withstand the 150 v transient according to 19 pfl 1, applicable for 40imx4 types, the same external circuitry with similar components as for iec/en 61000-4-5, level 2 compliance can be used.
rev. aug 05, 2004 page 6 of 12 www.power-one.com imx4 dc-dc series data sheet 4-watt dc-dc converters electrical output data general conditions: t a = 25c, unless t c is specified. table 6a: output data for single output units output v o nom 3.3 v 5.0 v 12.0 v 15.0 v characteristics conditions min typ max min typ max min typ max min typ max unit v o output voltage v i nom, i o = 0.5 i o nom 3.27 3.33 4.96 5.04 11.90 12.10 14.88 15.12 vdc i o nom output current v i min to v i max 900 700 340 280 ma i o l current limit 2 v i nom , t c = 25 c 1800 1400 680 560 d v o v line regulation v i min to v i max , i o nom 1 1 1 1 % d v load regulation v i nom 3.5 3 3 3 i o = (0.1 to 1) i o nom v o1, 2 output voltage noise v i min to v i max 5 80 80 120 150 mv pp i o = i o nom 6 20 40 20 40 40 60 50 75 v o clp output overvoltage min. load 1% 130 130 130 130 % limitation c o ext admissible <680 <680 <150 <100 f capacitive load 3 v o d dynamic voltage deviat. v i nom 250 250 250 250 mv t d load recovery time i o nom to 1 / 2 i o nom 1111ms regulat. a vo temperature coefficient v i min to v i max 0.02 0.02 0.02 0.02 %/k d v o / d t c i o = 0 to i o nom table 6b: output data for dual output units output v o nom 5 v 12 v 7 15 v 7 24 v 7 8 characteristics conditions min typ max min typ max min typ max min typ max unit v o1 output voltage v i nom 4.96 5.04 11.90 12.10 14.88 15.12 23.81 24.19 vdc v o2 i o1 = i o2 = 0.5 i o nom 4.95 5.05 11.88 12.12 14.85 15.15 23.75 24.25 i o nom output current 1 v i min to v i max 2 x 350 2 x 170 2 x 140 2 x 80 ma p o l power limit 2 3 v i nom , t c = 25c 2 x 3.5 2 x 4.0 2 x 4.2 2 x 4.0 w d v o v line regulation v i min to v i max , i o nom 1 1 1 1 % d v load regulation 4 v i nom 3 3.5 3 3 i o = (0.1 to 1) i o nom v o1, 2 output voltage noise v i min to v i max 5 100 140 150 240 mv pp i o = i o nom 6 40 60 45 70 50 75 40 120 v o clp output overvoltage min. load 1% 130 130 130 130 % limitation c o ext admissible <680 <150 <100 <47 f capacitive load 3 v o d dynamic voltage deviat. v i nom 250 600 750 750 mv t d load recovery time i o nom to 1 / 2 i o nom 1111ms regulat. a vo temperature coefficient v i min to v i max 0.02 0.02 0.02 0.02 %/k d v o / d t c i o = 0 to i o nom 1 each output capable of delivering full output power. 2 the current limit is primary side controlled. 3 sum of both outputs. 4 conditions for specified output. other output loaded with constant current i o = 0.5 i o nom . 5 bw = 20 mhz 6 measured with a probe according to en 61204. 7 not available for 70imx4 types.
rev. aug 05, 2004 page 7 of 12 www.power-one.com imx4 dc-dc series data sheet 4-watt dc-dc converters thermal considerations if a converter, mounted on a pcb, is located in free, quasi- stationary air (convection cooling) at the indicated maximum ambient temperature t a max (see table: temperature specifications) and is operated at its nominal input voltage and output power, the case temperature t c measured at the: measuring point of case temperature t c (see: mechanical data ) will approach the indicated value t c max after the warm-up phase. however, the relationship between t a and t c 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 surfaces and the properties of the printed circuit board. t a max is therefore only an indicative value and under practical operating conditions, the ambient temperature t a may be higher or lower than this value. caution: the case temperature t c measured at the measuring point of case temperature t c (see: mechanical data ) may under no circumstances exceed the specified maximum value. the installer must ensure that under all operating conditions t c remains within the limits stated in the table: temperature specifications. short circuit behavior 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. output overvoltage protection the outputs of the imx4 converters are protected against overvoltages by zener diodes. in the event of an overvoltage on the output, the unit will shut-down and attempt to restart automatically. 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 units are not designed to withstand external overvoltages applied to the outputs. connection in series the outputs of single or dual output units can be connected in series without any precautions, taking into consideration that the highest output voltage should remain below 60 v for selv operation. connection in parallel several converters with equal output voltage can be connected in parallel and will share their output current quite equally. however, this may cause start-up problems at initial start-up, and is only recommended in applications where one converter is able to deliver the full load current, e.g, in true redundant systems. fig. 10 v o versus i o (typ) of single output units (example for 20/40imx4-05) fig. 11 v o versus i o (typ) of dual output units (15 v), with 30 v load connected to vo+ and vo?. fig. 12 cross load regulation of dual output units. v o1 versus i o1 (typ) for various i o2 (40imx4-1515). fig. 13 flexible load distribution on dual outputs (2 12 v) with load variation from 0 to 150% of p o1 nom on output 1. output 2 loaded with 25% of p o2 nom . typical performance curves 5.25 5.0 4.75 4.5 4.25 4.0 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 i o [a] v o [v] 05056 14 14.5 15 15.5 16 16.5 v o1 [v] 20 40 60 80 100 120 140 i o1 [ma] 0 i o2 = 140 ma i o2 = 14 ma 05058 28.5 29 29.5 30 30.5 31 31.5 v o1 + v o2 [v] 20 40 60 80 100 120 140 i o [ma] 0 05057 v o1 , v o2 [v] i o1 i o1 no 05059 12.8 12.4 12 11.6 11.2 030 60 90 120 150 [%] v o2 v o1
rev. aug 05, 2004 page 8 of 12 www.power-one.com imx4 dc-dc series data sheet 4-watt dc-dc converters electromagnetic compatibility (emc) electromagnetic immunity table 7: immunity type tests phenomenon standard 1 class coupling value waveform source test in per- level mode 2 applied imped. procedure oper. form. 3 electrostatic iec/en 2 contact discharge 4000 v p 1/50 ns 330 ? 10 positive and yes b discharge 61000-4-2 3 air discharge 8000 v p 10 negative to case discharges electromagnetic iec/en 3 antenna 10 v/m am 80% 26?1000 mhz yes a field 61000-4-3 1 khz env 50204 pm, 50% duty 300 mhz cycle, 200 hz resp. frequ. electrical fast iec/en 4 +i/?i 4000 v p bursts of 5/50 ns 50 ? 1 min positive yes b transient/burst 61000-4-4 5 khz rep. rate 1 min negative transients with bursts per 15 ms burst coupling mode duration and a 300 ms period surge iec/en 2 +i/?i 1000 v p 1.2/50 s2 ? 5 pos. and 5 neg. yes a 61000-4-5 5 surges per coupling mode conducted iec/en 3 +i/?i 3 v rms am 80% 50 ? 0.15 to 80 mhz yes a disturbancies 61000-4-6 (140 db v) 1 khz 150 ? transient 19 pfl 1 4 +i/?i 150 v p 0.1/0.3 ms limited to 3 positive yes a <100 a 5 repetitions 1 related and previous standards are referenced in: technical information: standards. 2 i = input, o = output 3 a = normal operation, no deviation from specification, b = temporary deviation from specs possible. 4 for 40imx4 types (additional external components required). not applicable for 20imx4 types 5 external components required fig. 14 overload switch-off (hiccup mode). frequency of pulses: 16.5 hz, puls duration: 8.5 ms. fig. 15 efficiency versus input voltage and load. typical values (40imx4-1212). 40 50 60 70 80 90 p o1 p o nom [%] v i nom v i max v i min 70 100 v o [%] t [ms] 05041 8.5 60.5 60.5 overload short circuit condition switch-off
rev. aug 05, 2004 page 9 of 12 www.power-one.com imx4 dc-dc series data sheet 4-watt dc-dc converters fig. 16 typical disturbance voltage (quasi-peak) at the input ac- cording to cispr 11/en 55011 and cispr 22/en 55022, measured at v i nom and i o nom . output leads 0.1 m, twisted. external capacitor at the input required (see: recommendations for compliance with en 55022) (40imx4-1515). fig. 17 typical radio frequency interference voltage at v i nom , i o nom , measured with an antenna (distance 10 m). output leads 0.1 m, twisted (40imx4-1515). 07033 en 55022 a en 55022 b 90 80 70 60 50 40 30 20 10 0 0 .01 0 .05 0.1 0.5 1 2 5 10 20 30 [ db v] mhz 0 .02 en 55022 b 50 40 30 20 10 0 30 50 100 200 500 1000 fre q uenc y [ mhz ] [db v/m] 07034 electromagnetic emission conducted rfi noise at input according to en 55022 radiated rfi noise according to en 55022. mechanical data dimensions in mm. tolerances 0.3 mm unless otherwise indicated. fig. 18 standard or alternative pinout (0.5mm pin diameter) weight: <10 g fig. 19 open frame (option z) weight: <10 g 33 (1.3") 1 20 (0.79") 12 1 13 24 11 x 2.54 (0.1") s09042 15.24 (0.6") 8.5 (0.33") 0.5 (0.02") 3 (0.12") measurin g point of case temperature t c 31 (1.22") 1 20 (0.79") 12 13 24 11 x 2.54 (0.1") s90004 8.5 (0.33") 0.5 (0.02") 3 (0.12") 15.24 (0.6") european projection
rev. aug 05, 2004 page 10 of 12 www.power-one.com imx4 dc-dc series data sheet 4-watt dc-dc converters immunity to environmental conditions table 8: environmental testing test method standard test conditions status ca damp heat iec/din iec 60068-2-3 temper ature: 40 2 c unit not steady state mil-std-810d section 507.2 relative humidity: 93 +2/-3 % operating duration: 56 days ea shock iec/en/din en 60068-2-27 acceleration amplitude: 100 g n = 981 m/s 2 unit (half-sinusoidal) mil-std-810d section 516.3 bump duration: 6 ms operating number of bumps: 18 (3 each direction) eb bump iec/en/din en 60068-2-29 acceleration amplitude: 40 g n = 392 m/s 2 unit (half-sinusoidal) mil-std-810d section 516.3 bump duration: 6 ms operating number of bumps: 6000 (1000 each direction) fc vibratio n iec/en/din en 60068-2-6 acceleration amplitude: 0.35 mm (10 to 60 hz) unit (sinusoidal) 5 g n = 49 m/s 2 (60 to 2000 hz) operating frequency (1 oct/min): 10 to 2000 hz test duration: 7.5 h (2.5 h each axis) fh vibration, iec/en 60068-2-64 acceleration spectral density: 0.05 g n 2 /hz unit broad-band din 40046 part 23 f requency band: 10 to 500 hz operating random mil-std-810d section 514.3 acceler ation magnitude: 4.9 g n rms (digital control) test duration: 3 h (1 h each axis) kb salt mist, cyclic iec/en/din iec 60068-2-52 concentration: 5% (30c) unit not (sodium chloride dur ation: 2 h per cycle operating nacl solution) storage: 40c, 93% rel. humidity storage duration: 22 h per cycle number of cycles: 3 table 9: temperature specifications, valid for air pressure of 800 to 1200 hpa (800 to 1200 mbar) temperature standard -9 option -8 characteristics conditions min max min max unit t a ambient temperature 1 operational 2 ?40 71 ?40 85 c t c case temperature ?40 95 ?40 105 t s storage temperature 1 non operational ?40 100 ?55 105 1 mil-std-810d section 501.2 and 502.2 2 see thermal considerations table 10: mtbf and device hours (mil-std) mtbf ground benign ground fixed ground mobile mtbf acc. to mil-hdbk-217f t c = 40c t c = 40c t c = 70c t c = 50c 40imx4-05-9 2'651'000 h 349'000 h 124'000 h 119'000 h mtbf acc. to bellcore t c = 40c t c = 40c t c = 70c t c = 50c 40imx4-1212-9 3'535'000 h 1'768'000 h 917'000 h 476'000 h
rev. aug 05, 2004 page 11 of 12 www.power-one.com imx4 dc-dc series data sheet 4-watt dc-dc converters table 11: pin allocation for standard industrial pinout and option z pin single output units dual output units 2 vi? vi? 3 vi? vi? 10 n.c. - 11 - vo? 14 vo + vo+ 16 vo? go 22 vi+ vi+ 23 vi+ vi+ table 12: pin allocation for option k pin single output units dual output units 1 vi+ vi+ 2 n.c. - 10 - go 11 - go 12 vo? - 13 vo + vo? 15 - vo+ 24 vi? vi? table 14: electric strength test voltages characteristic input - output unit 20/40imx4 70imx4 electric strength 1.2 1.5 kv rms test voltage 1 s 1.5 2.0 kv dc coupling ~1.1 ~1.1 nf capacitance insulation resist. >100 >100 m ? at 500 v dc partial discharge consult factory kv extinction voltage safety and installation instructions installation instruction installation of the dc-dc converters must strictly follow the national safety regulations in compliance with the enclosure, mounting, creepage, clearance, casualty, markings and segregation requirements of the end-use application. connection to the system shall be made via a printed circuit board according to: mechanical data . the units should be connected to a secondary circuit. check for hazardous voltages before altering any connections. do not open the module. 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. 1 12 13 24 1001 3 bottom view fig. 20 pin numbering input fuse to prevent excessive current flowing through the input supply 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 f1a for 20imx4, f0.5a for 40imx4 and f0.315a for 70imx4 types. safety of operator accessible output circuits if the output circuit of a dc-dc converter is operator accessible, it shall be an selv circuit according to iec/en 60950 related safety standards the insulation concept table on next page 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 48 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 . standards and approvals all dc-dc converters are ul recognized according to ul 1950, ul recognized for canada to can/csa c22.2 no. 950-95 and lga approved to iec/en 60950 standards. the units have been evaluated for: building in basic insulation input to output, based on their maximum input voltage the use in a pollution degree 2 environment connecting the input to a secondary circuit which is subject to a maximum transient rating of 1500 v for 20imx4 and 40imx4, 2000 v for 70imx4 types. the dc-dc converters are subject to manufacturing surveillance in accordance with the above mentioned ul, csa, en and iso 9001 standards. cleaning agents in order to avoid possible damage, any penetration of cleaning fluids has to be prevented, since the power supplies are not hermetically sealed. protection degree the protection degree of the dc-dc converters is ip 30. isolation the electric strength test is performed as factory test in accordance with iec/en 60950 and ul 1950 and should not be repeated in the field. power-one will not honor any guarantee claims resulting from electric strength field tests.
rev. aug 05, 2004 page 12 of 12 www.power-one.com imx4 dc-dc series data sheet 4-watt dc-dc converters description of options table 16: survey of options option function of option characteristic ?8 extended operational ambient temperature range t a = ?40 to 85c k alternative pinout not available for all types z open frame not av ailable for all types table 15: insulation concept leading to an selv output circuit conditions fr ont end dc-dc converter result supply minimum required gr ade maximum minimum required safety measures to achieve the safety status of voltage of isolation, to be provided dc output status of the front end specified safety status of the the dc-dc by the ac-dc front end, v oltage output circuit output circuit converter output including mains supplied from the circuit battery charger front end 1 mains basic <60 v earthed selv circuit 2 operational insulation, pro- selv circuit -250 v ac vided by the dc-dc converter elv circuit input fuse 3 output suppressor earthed selv >60 v hazardous voltage diodes 4 , and earthed circuit secondary circuit output circuit 2 double or reinforced <60 v selv circuit operational insulation, pro- selv circuit vided by the dc-dc converter >60 v tnv-2 circuit basic insulation, based on the double or reinforced insu- maximum input voltage, pro- lated unearthed hazardous vided by the dc-dc converter voltage secondary circuit 5 1 the front end output voltage should match the specified input voltage range of the dc-dc converter. 2 the earth connection has to be provided by the installer according to the relevant safety standard, e.g. iec/en 60950. 3 the installer shall provide an approved fuse (type with the lowest rating suitable for the application) in a non-earthed input line 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 . 4 each suppressor diode should be dimensioned in such a way, that in the case of an insulation fault the diode is able to limit t he output voltage to selv (<60 v) until the input fuse blows (see fig.: schematic safety concept ). 5 has to be insulated from earth by double or reinforced insulation according to the relevant safety standard, based on the maxim um output voltage from the front end. ac-dc front end dc-dc con- verter mains fuse battery earth connection suppressor diode selv earth connection + ? ~ ~ 10004 fig. 21 schematic safety concept. use fuse, suppressor diode and earth connection as per table: safety concept leading to an selv output circuit . option -8 extension of the temperature range from standard (?40 to 71c) to (?40 to 85c). the modules will provide full output power with free air convection cooling. option k alternative pinout. this option defines an alternative pinout, i.e. compatible with ips 3 series.

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