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board mountable dc-dc converters imx 35 series edition 5/08.2001 r1 1/18 35 watt dc-dc converters imx 35 series wide input voltage ranges up to 75 v dc 2...4 isolated outputs up to 60 v dc 1500 v dc i/o electric strength test voltage immunity to iec/en 61000-4-2,-3,-4,-5 and -6 programmable input undervoltage lock-out 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 ?0...85 c thermal protection ?" 2,5" case with 10.5 mm profile or 8.9 mm profile open frame supplementary insulation summary the imx 35 series of board mountable 35 watt dc-dc con- verters has been designed according to the latest industry requirements and standards. the converters are particu- larly suitable for use in mobile or stationary applications in transport, railways, industry, or telecommunication where variable input voltages or high transient voltages are preva- lent. covering a total input voltage range from 9 up to 75 v with 2 different types. the units are available with double, triple and quad outputs, electrically isolated, from 3.3 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 re- sponse 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 imx 35 types provide supplementary insula- tion. connected to a secondary circuit the 40 imx 35 types feature selv outputs even if the voltage at the converter in- put exceeds the selv-limit of 60 v dc. 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 condi- tions. careful considerations of possible thermal stresses ensure the absence of hot spots providing long life in envi- ronments where temperature cycles are a reality. the ther- mal design without using any potting material allows opera- tion up to an ambient temperature of ?0...85 c in free air. for extremely high vibration environments the case has holes for screw mounting. inhibit or open frame mounting provide a high level of application specific engineering and design-in flexibility. safety according to iec/en 60950, ul 1950 approvals pending lga table of contents page summary .......................................................................... 1 type survey and key data .............................................. 2 type key .......................................................................... 3 functional description ...................................................... 4 electrical input data ......................................................... 6 electrical output data ...................................................... 8 page auxiliary functions ......................................................... 11 electromagnetic compatibility (emc) ............................ 13 immunity to environmental conditions ........................... 14 mechanical data ............................................................ 15 safety and installation instructions ................................ 16 description of option ...................................................... 18 76.2 3" 63.5 2.5" 10.5 0.41" 72.8 2.87" 47.8 1.88" 8.9 0.35"
board mountable dc-dc converters imx 35 series edition 5/08.2001 r1 2/18 type survey and key data table 1: type survey output 1 output 2 output 3 output 4 input voltage eff. type trim 1 opt. 2 u o nom i o nom u o nom i o nom u o nom i o nom u o nom i o nom u i min ... u i max h typ designation [v dc] [a] [v dc] [a] [v dc] [a] [v dc] [a] [v dc] [%] 52.752.7---- 9...36 84 20 imx 35-05-05-8 primary 52.852.8---- 18...75 84 40 imx 35-05-05-8 primary 121.3121.3---- 9...36 87 20 imx 35-12-12-8 primary 121.4121.4---- 18...75 87 40 imx 35-12-12-8 primary 151.1151.1---- 9...36 87 20 imx 35-15-15-8 primary 151.2151.2---- 18...75 87 40 imx 35-15-15-8 primary 3.3 3.5 5 1.3 5 1.3 - - 9...36 81 20 imx 35-03d05-8 3 second. i, y 3.3 4.25 5 1.35 5 1.35 - - 18...75 83 40 imx 35-03d05-8 3 second. i, z 3.3 3.5 12 0.65 12 0.65 - - 9...36 84 20 imx 35-03d12-8 3 second. i, y 3.3 4.25 12 0.7 12 0.7 - - 18...75 86 40 imx 35-03d12-8 3 second. i, z 3.3 3.5 15 0.55 15 0.55 - - 9...36 84 20 imx 35-03d15-8 3 second. i, y 3.3 4.25 15 0.6 15 0.6 - - 18...75 86 40 imx 35-03d15-8 3 second. i, z 5.1 2.9 5 1.35 5 1.35 - - 9...36 81 20 imx 35-05d05-8 3 second. i, y 5.1 3.4 5 1.4 5 1.4 - - 18...75 83 40 imx 35-05d05-8 3 second. i, z 5.1 2.9 12 0.65 12 0.65 - - 9...36 84 20 imx 35-05d12-8 3 second. i, y 5.1 3.4 12 0.7 12 0.7 - - 18...75 86 40 imx 35-05d12-8 3 second. i, z 5.1 2.9 15 0.55 15 0.55 - - 9...36 84 20 imx 35-05d15-8 3 second. i, y 5.1 3.4 15 0.6 15 0.6 - - 18...75 87 40 imx 35-05d15-8 3 second. i, z 5 1.35 5 1.35 5 1.35 5 1.35 9...36 86 20 imx 35 d05d05-8 primary 5 1.4 5 1.4 5 1.4 5 1.4 18...75 87 40 imx 35 d05d05-8 primary 5 1.35 12 0.65 12 0.65 5 1.35 9...36 86 20 imx 35 d05d12-8 primary 5 1.4 12 0.7 12 0.7 5 1.4 18...75 88 40 imx 35 d05d12-8 primary 5 1.35 15 0.55 15 0.55 5 1.35 9...36 87 20 imx 35 d05d15-8 primary i, z 5 1.4 15 0.6 15 0.6 5 1.4 18...75 88 40 imx 35 d05d15-8 primary 12 0.65 12 0.65 12 0.65 12 0.65 9...36 87 20 imx 35 d12d12-8 primary 12 0.7 12 0.7 12 0.7 12 0.7 18...75 89 40 imx 35 d12d12-8 primary 15 0.55 15 0.55 15 0.55 15 0.55 9...36 88 20 imx 35 d15d15-8 primary 15 0.6 15 0.6 15 0.6 15 0.6 18...75 89 40 imx 35 d15d15-8 primary 1 for the units imx 35-05-05, imx 35-12-12, imx 35-15-15 and all the quad versions with equal output voltages, the trim input (pi n 5) is on the primary side and influences all outputs simultaneously while pin 18 is not connected. for the quad versions with unequal out- put voltages (e.g. 40 imx 35 d05d12-8) the trim input (pin 5) influences only the first power train i.e. v 01 and v 04 . for the triple ver- sions the trim input (pin 18) is on the secondary side and influences the first output (v 01 ) only. 2 for minimum quantity contact power-one. 3 for lead times contact power-one.
board mountable dc-dc converters imx 35 series edition 5/08.2001 r1 3/18 type key double output units 20 imx 35 - 12 - 12 -8 input voltage range u i 9...36 v dc ........................................... 20 18...75 v dc ........................................... 40 series ...................................................................... imx 35 output 1 of double types (5, 12, 15 v) ............... 05, 12, 15 output 2 of double types (5, 12, 15 v) ............... 05, 12, 15 operating ambient temperature range t a 40...85 c .................................................. -8 triple output units 40 imx 35 - 05 d05 -8 i z input voltage range u i 9...36 v dc ........................................... 20 18...75 v dc ........................................... 40 series ...................................................................... imx 35 output 1 of triple types (3.3, 5 v) ............................. 03, 05 output 2/3 of triple types (3.3, 5 v) ............ d05, d12, d15 operating ambient temperature range t a 40...85 c .................................................. -8 options: inhibit ............................................................ i base plated open frame .............................. y 1 open frame .................................................. z 2 quad output units 40 imx 35 d05 d05 -8 i z input voltage range u i 9...36 v dc ........................................... 20 18...75 v dc ........................................... 40 series ...................................................................... imx 35 output 1/4 of quad types (5, 12, 15 v) ....... d05, d12, d15 output 2/3 of quad types (5, 12, 15 v) ...... d05, d12, d15 operating ambient temperature range t a 40...85 c .................................................. -8 options: inhibit ............................................................ i open frame .................................................. z 2 1 20 imx 35 triple output types. 2 all models except 20 imx 35-triple output types.
board mountable dc-dc converters imx 35 series edition 5/08.2001 r1 4/18 functional description the imx 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 three main types. the double output types consist of two electrically isolated out- puts vo1, vo2. vo1 and vo2 derive 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 u o nom is pos- sible by use of the trim input on the primary side (see: block diagram, dual output types .) the triple output types consist of 3 outputs vo1, vo2 and vo3. vo1 (3.3 or 5.1 v) is generated by a power train using state of the art schottky diode (20 imx 35) or a synchro- nous rectifier technology (40 imx 35) thus enabling high ef- ficiency. also there is active magnetic feedback on this out- put via a pulse transformer which results in very tight and reliable regulation of the output voltage. the other two out- puts vo2 and vo3 are electrically isolated double outputs. vo2, vo3 are restricted to being of the same output voltage (i.e. d05, d12, etc.). voltage regulation is achieved with a passive transformer feedback from the main transformer of that power train. adjustment of the output 1 ( u o1 ) is pro- vided by the trim1 pin referenced to the secondary side and allows for programming of the voltage of output 1 in the range of approx. 80...105% of u o nom . (see: block diagram, triple output types ) the quad 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 inde- pendent from the other one). voltage regulation for each pair of outputs is achieved with passive transformer feed- back 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 volt- ages, the trim1/4 input influences only vo1 and vo4. see: block diagram, quad 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 drop below typically 60% of u o nom , the entire converter will shut down and automatically restart in short intervals. overtemperature protection is provided, which will shut down the converter in excessive overload conditions with automatic restart. pwm 4 8 1 vi+ pul sd 5 trim 6 w 7 ref 2 vi 17 15 16 13 11 19 vo1+ vo1 vo2+ vo2 n.c. 03100 3 n.c. 18 1 12 1 14 n.c. 1 1 internally connected, leave open-circuit fig. 1 block diagram 1, double output types
board mountable dc-dc converters imx 35 series edition 5/08.2001 r1 5/18 pwm 4 8 1 vi+ sd pul 5 trim /trim1/4 6 w 7 ref 2 vi 16 15 17 18 13 14 12 11 vo4 vo1+ vo1 vo4+ vo2+ vo2 vo3+ vo3 03098 3 n.c. 19 n.c. fig. 3 block diagram 3, quad output types pwm 4 1 1 17 15 18 vi+ sd pul vo1+ vo1 trim1 03097 5 n.c. 6 w 7 ref control 2 vi 13 14 vo2+ vo2 12 11 vo3+ vo3 3 n.c. 19 n.c. 16 n.c. fig. 2 block diagram 2, triple output types
board mountable dc-dc converters imx 35 series edition 5/08.2001 r1 6/18 electrical input data general conditions: t a = 25 c, unless t c is specified. shut down pin left open circuit (not connected). trim not connected. table 2: input data input 20 imx 40 imx characteristics conditions min typ max min typ max unit u i input voltage range 1 t a min ... t a max 9 2 36 18 2 75 v dc u i nom nominal input voltage i o = 0... i o nom 20 40 u i sur repetitive surge voltage abs. max input (3 s) 40 100 t start up converter switch on worst case condition at 0.25 0.5 0.25 0.5 s start-up time 2 sd high u i min and full load 0.1 0.1 t rise rise time 3 u i nom resist load 5 5 ms i o nom capac. load 10 20 10 20 i i o no load input current i o = 0, u i min ... u i max 70 50 ma i irr reflected ripple current i o = 0... i o nom 30 30 i inr p inrush peak current 4 u i = u i nom 89a c i input capacitance for surge calculation 2 1.3 f u sd shut down voltage unit shut down 10...0.7 10...0.7 v dc unit operating open-circuit or 2...20 open-circuit or 2...20 r sd shut down input resistance for current calculations approx. 10 approx. 10 k ? i sd input current if unit u i min ... u i max 12 6 ma shut down f s switching frequency u i min ... u i max , i o = 0... i o nom approx. 220 approx. 220 khz u i rfi input rfi level, conducted en 55022 5 b 6 b 6 1 u i min will not be as stated if u o is increased above u o nom by use of trim input. if the output voltage is set to a higher value, u i min will be proportionately increased. 2 input undervoltage lock-out at typ. 90% of u i min . 3 measured with resistive and max. admissible capacitive load. 4 source impedance according to prets 300132-2, version 4.3. 5 measured with a lead length of 0.1 m, leads twisted. 6 external capacitor required.
board mountable dc-dc converters imx 35 series edition 5/08.2001 r1 7/18 inrush current 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. i [a] t [ s] 04022 0 10 20 30 40 50 60 70 80 90 100 4 3 2 1 fig. 4 typical inrush current at u i nom , p o nom versus time (40 imx 35). source impedance according to prets 300132-2, version 4.3 at u i nom . fig. 5 converter start-up and rise time u o nom u o t start up t rise t 04008 input transient voltage protection 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. table 4: built-in transient voltage suppressor type breakdown peak power peak pulse voltage at 1 ms current v br nom [v] p p [w] i pp [a] 20 imx 35 50 1500 22 40 imx 35 100 1500 9.7 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 . note: the suppressor diode d is only necessary for 20 imx 35 types. table 5: components for external circuitry for iec/en 61000-4-5, level 2 or etr 283 (19pfl1) compliance. type inductor (l) capacitor (c) diode (d) 20 imx 35 22 h/5a 470 f/40 v 1.5 k e47a 40 imx 35 68 h/2.7 a 2 x 100 f/100 v - vi+ vi c l d + 04036 fig. 6 example for external circuitry to comply with iec/en 61000-4-5 or etr 283 (19pfl1); the suppressor diode d is only necessary for 20 imx 35 types. 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. table 3: recommended external fuses converter type fuse type 20 imx 35 f8.0a 40 imx 35 f4.0a 22 23.8 11.5 04052 fig. 7 dimensions of inductor l for 20 imx 35 and 40 imx 35 types (e.g. coil craft, pch-45 series).
board mountable dc-dc converters imx 35 series edition 5/08.2001 r1 8/18 electrical output data general conditions: t a = 25 c, unless t c is specified shutdown pin left open-circuit (not connected) trim not connected table 6a: output data for single (main) output. output 3.3 v 5.1 v characteristics conditions min typ max min typ max unit u o output voltage u i nom , i o = 0.5 i o nom 3.28 3.32 5.07 5.13 v dc i o nom output current 20 imx u i min ... u i max 3.5 2.9 a 40 imx 4.25 3.4 i o1l current limit 1 20 imx u i nom , t c = 25 c 5.5 4.2 i o2l u o1 = 93% u o nom i o1l 40 imx 6.1 4.6 i o2l d u o u line/load regulation u i min ... u i max , 1 1% i o = (0.05...1) i o nom u o1/2 output voltage noise u i min ... u i max 2 70 80 mv pp i o = i o nom 3 40 40 u o l output overvoltage limit. 4 115 130 115 130 % c o ext admissible capacitive load 4000 2700 f u o d dynamic voltage deviat. u i nom 250 250 mv t d load recovery time i o nom ? 1 / 2 i o nom 11ms regulation iec/en 61204 a uo temperature coefficient u i min ... u i max 0.02 0.02 %/k d u o / d t c i o = 0.1...1 i o nom table 6b: output data for double output power trains. output 2 5 v 2 12 v 2 15 v characteristics conditions min typ max min typ max min typ max unit u o1 output voltage u i nom 4.95 5.05 11.88 12.12 14.85 15.15 v dc u o2 i o = 0.5 i o nom 4.94 5.06 11.86 12.14 14.82 15.18 i o nom output current 20 imx u i min ... u i max 2 1.35 2 0.65 2 0.55 a 40 imx 2 1.4 2 0.70 2 0.60 i ol current limit 1 20 imx u i nom , t c = 25 c 3.5 1.8 1.5 40 imx u o = 93% u o nom 3.7 2.0 1.6 d u o u line regulation u i min ... u i max , i o nom 1 1 1% d u o l load regulation u i nom 3 3 3 i o = (0.1...1) i o nom u o1/2 output voltage noise u i min ... u i max 2 80 120 150 mv pp i o = i o nom 3 40 60 70 u o l output overvoltage limit. 4 min. load 1% 115 130 115 130 115 130 % c o ext admissible capacitive load 4000 470 330 f u o d dynamic voltage deviat. u i nom 250 400 450 mv t d load recovery time i o nom ? 1 / 2 i o nom 111ms regulation a uo temperature coefficient u i min ... u i max 0.02 0.02 0.02 %/k d u o / d t c i o = 0.1...1 i o nom 1 the current limit is primary side controlled. in the event of a sustained overload condition the thermal protection may cause t he unit to shutdown (restart on cool-down). 2 bw = 20 mhz 3 measured with a probe according to en 61204 4 the overvoltage protection is via a primary side second regulation loop, not tracking with trim control.
board mountable dc-dc converters imx 35 series edition 5/08.2001 r1 9/18 thermal considerations 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 c measured 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 a and t c depends 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 the surfaces and 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 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: mechani- cal data ) may under no circumstances exceed the specified maximum value. the installer must ensure that under all operating conditions t c remains within the lim- its stated in the table: temperature specifications. temperature range full output power from 40...71 c. above 71 c the output power derating below should be observed. the modules will provide the specified output power with free air convec- tion cooling. fig. 9 a u o versus i o (typ) of units with u o = 5.1 v. (40 imx 35-05d12-8). 5.5 5.0 4.5 4.0 3.5 3.0 0 1 2 3 4 5 i o [a] u o [v] 05019 connection in series the outputs of one or several single or double output power trains may be connected in series without any precautions. connection in parallel several outputs of the same converter with equal output voltage (e.g. 5v / 5v) can be put in parallel and will share their output currents almost equally. parallel operation of double outputs of several converters with the same output voltage may cause start-up problems at initial start-up. this is only advisable in applications where one converter is able to deliver the full load current as e.g. required in true redundant systems. the first outputs (5.1v or 3.3 v) of triple output units should not be paralleled, except in true redundant systems using decoupling diodes output overvoltage protection the outputs of the converter are protected against overvolt- ages by a second control loop. in the event of an overvolt- age 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 with- stand externally applied overvoltages. typical performance curves general conditions: t a = 25 c, unless t c is specified. shut down pin left open circuit. trim input not connected. short circuit behaviour the current limit characteristic shuts down the converter whenever a short circuit is applied to an output. it acts self- protecting and automatically recovers after removal of the overload condition (hiccup mode). overtemperature protection the converter is protected against 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. this feature prevents from excessive internal temperature which could occur under heavy overload conditions. 1.2 1.0 0.8 0.6 0.4 0 20 20 60 0.2 40 80 p o / p o max t a [ c] 40 0 11047 fig. 8 maximum allowed output power versus ambient tempera- ture.
board mountable dc-dc converters imx 35 series edition 5/08.2001 r1 10/18 11.0 11.5 12.0 12.5 13.0 13.5 u o4 [v] 0.06 0.20 0.30 0.40 0.50 0.60 0.70 i o1 [a] 0.10 05164 i o4 = 0.35 a i o4 = 0.035 a fig. 10 cross load regulation u o4 versus i o1 (typ) for various i o4 for vo1, vo4 on power train 1. see: block diagram double output types. (20 imx 35 d12d12-8) fig. 11 flexible load distribution on power train 1 of 40 imx 35 d12d12-8 (4 12 v) with load variation from 0...150% of p o nom on output v o1 with v o4 loaded with 50% of p o4 nom . u o1 , u o2 [v] i o1 i o1 nom 05039 14 13 12 11 10 025 50 75 100 150 [%] u o4 u o1 125 60 70 80 90 h [%] 50 75 100 p o p o total 25 05152 [%] u i min u i nom 60 70 80 90 h [%] 50 75 100 p o p o total 25 05153 [%] u i min u i nom fig. 12 efficiency versus input voltage and load. typical values 40 imx 35 d12d12-8 fig. 13 efficiency versus input voltage and load. typical values 20 imx 35 d12d12-8 70 100 u o [%] t [ms] 05041 8 60 60 overload short circuit condition switch-off fig. 14 overload switch off (hiccup mode), approximate values. fig. 9 b u o1/2 versus i o1/2 of double output power trains (i.e. 2 12 v). see: block diagram 1 7 8 9 10 11 12 13 u o [v] 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 i o total [a] 0 05020
board mountable dc-dc converters imx 35 series edition 5/08.2001 r1 11/18 vo1+ vi+ vi vo1 06136 trim1 r ext1 r ext2 4 pul 1 2 17 18 15 r pul fig. 15 input undervoltage lockout adjustment (pul) and output voltage adjustment by use of the trim1 input referenced to the secondary side (triple output units). table 9: u o1 versus r ext for u o1 = 80...105% u o nom ; typical values (u i nom , i o1/2 = 0.5 i o1/2 nom ); triple output units u o nom r ext1 r ext2 [v] u o1 [v] [k ? ] u o1 [v] [k ? ] 3.3 2.8 0.75 3.3 2.97 1.8 3.4 5.6 3.135 4.7 3.46 3.3 5.1 5.0 33 5.1 4.84 9.1 5.36 3 4.59 2.2 5.25 8.5 trim vo1+ vo2 + u ext vi+ vi r ext vo1 vo2+ 06137 control circuit u ref = 2.5 v 4 5 2 17 15 13 11 >7 k ? trim 1/4 fig. 16 output voltage control for double and quad output units by means of the trim input on the primary side. auxiliary functions adjustable output voltage as a standard feature, the imx 35 offer adjustable output voltages in the range 80...105% of u o nom by use of a con- trol pin. the trim control is offered either on primary or sec- ondary side of the converter depending on type. the double output units imx 35-05-05, imx 35-12-12 and imx 35-15-15 have a trim input connected to pin 5. this in- put influences both outputs simultaneously. both power trains have passive transformer feedback and the trim in- put (pin 5) is referenced to the primary side. fig. 16 shows the circuit topology. adjustment of the output voltage is pos- sible by means of either an external resistor r ext in the range of 100...105% of u o nom (table 10) or in the range of 80...105% of u o nom by means of an external voltage source (table 11). the imx 35 triple output units feature a first power train with magnetic feedback. the simplified circuit is shown in fig. 15. the trim1 (pin 18) is secondary referenced and in- fluences only the first power train. adjustment of the output voltage is possible by means of an external resistor r ext between the trim1 and either vo1+ or vo1 . if the trim1 input is left open-circuit, the output voltage is set to u o1 nom . table 9 states typical values required to program the output a) adjustment by means of an external resistor r ext : adjustment of the output voltage by means of an external resistor r ext is possible within the range of 100...105% of u o nom . r ext should be connected between the trim pin 5 and vi . connection of r ext to vi+ may damage the con- verter. table 10 indicates suitable resistor values for typi- cal output voltages under nominal conditions ( u i nom , i o = 0.5 i o nom ). b) adjustment by means of an external voltage source u ext (fig. 16): for external output voltage adjustment in the range 80...105% of u o nom a (0...15 v) source u ext is required, connected to the trim pin 5 and vi . table 11 below indi- cates typical u o versus u ext values. applying a control voltage greater 15 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. (input resis- tor of the trim input is >7 k ? ) table 10: r ext1 for u o > u o nom ; approximate values (u i nom , i o = 0.5 i o nom ) u o r ext [% u o nom ] trim [k ? ] trim1/ 4 [k ? ] 105...108 (107 typically) 0 0 105 2.0 4.3 104 4.2 9.0 103 8.2 18 102 16 33 101 47 91 100 ? table 11: u o versus u ext for u o = 80...105% u o nom ; typical values (u i nom , i o = 0.5 i o nom ) u o u ext [% u o nom ] trim [v] trim1/ 4 [v] 105 0 0 102 1.6 1.5 100 2.5 2.5 95 4.25 4.25 85 8.45 8.25 80 10.5 10.2 voltage u o1 to approximately the values as indicated. the quad output units are shown in block diagram 3. all types with equal output voltage have the trim function con- nected to pin 5 referenced to the primary side which influ- ences all outputs simultaneously. the schematics are shown in fig. 16, the values of the adjust resistor r ext in ta- ble 10 and the external voltage source in table 11. the quad output unit with unequal output voltages have the trim1 input (pin 5) referenced to the primary side influenc- ing only the output of the first power train ( u o1 , u o4 ).
board mountable dc-dc converters imx 35 series edition 5/08.2001 r1 12/18 synchronisation (w) this logic input can be used to synchronise the oscillator to an external frequency source. the input is edge triggered with ttl thresholds, and requires a source frequency of 490...520 khz (duty cycle 10...90%). the external source frequency is internally divided by 2 to define the switching frequency of the converter. if unused, this pin can be con- nected to v1 (pin 2) or left open-circuit. reference (ref) the signal output provides a stable 5 v ( 0.1 v) reference signal on pin ref. it is protected by a 1 k ? resistor. this sig- nal may be used also in conjunction with the trim input pin 5 (primary side) as a limited external voltage reference. then we recommend to connect a filter capacitor (0.1 f) between ref and vi . shut down function 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: 2.0...20 v converter shut down: 10...0.7 v programmable input undervoltage lockout pul a special feature of these units is the accurate undervoltage lockout function which protects the units (and the 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 trigger level hysteresis units 20 imx 35 7...8 0.5 v 40 imx 35 14...15.5 1 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 pull up the preset level as indi- cated in table 8. (see: fig. 15 ). table 8: typical values for r ext and the respective lockout voltage for input voltage. 20 imx 35 40 imx 35 r pul [k ? ] u i min [v] r pul [k ? ] u i min [v] ? 8 ? 15.5 39 10 43 22 19 12 16 26 13 14 10 28 9.1 16 0 32
board mountable dc-dc converters imx 35 series edition 5/08.2001 r1 13/18 electromagnetic immunity table 12: immunity type tests phenomenon standard 1 class coupling value waveform source test in per- 3 level mode 2 applied imped. procedure oper. form. electrostatic iec/en 2 contact discharge 4000 v p 1/50 ns 330 ? 10 positive and yes b discharge 61000-4-2 (r pin open) 10 negative to case 3 air discharge 8000 v p discharges (r pin open) 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 900 mhz cycle, 200 hz resp. frequ. electrical fast iec/en 4 direct +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 transients per 15 ms burst coupling mode duration and a 300 ms period surge iec/en 3 +i/ i 2000 v p 1.2/50 s2 ? 5 pos. and 5 neg. yes b 61000-4-5 5 impulses per coupling mode en 50155 d 1800 v 5/50 s 100 ? triangular yes b g 8400 v 0.05/01 s conducted iec/en 3 +i/ i 10 v rms am modulated 50 ? 0.15...80 mhz yes a disturbancies 61000-4-6 (140 db v) 80%, 1 khz 150 ? 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. possibe. 4 for 40 imx 35 types (additional external components required). not applicable for 20 imx 35 types. 5 external components required. which typically occur in many installations, but especially in battery driven mobile applications. electromagnetic compatibility (emc) a suppressor diode together with an input filter form an ef- fective protection against high input transient voltages fig. 17 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 35-d12d12-9) electromagnetic emission 07020 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
board mountable dc-dc converters imx 35 series edition 5/08.2001 r1 14/18 table 16: environmental testing test method standard test conditions status ca damp heat iec/din iec 60068-2-3 temperature: 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 vibration iec/en/din en 60068-2-6 acceleration amplitude: 0.35 mm (10...60 hz) unit (sinusoidal) 5 g n = 49 m/s 2 (60...2000 hz) operating frequency (1 oct/min): 10...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 mil-std-810d section 514.3 frequency band: 20...500 hz operating random acceleration 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% (30 c) unit not (sodium chloride duration: 2 h per cycle operating nacl solution) storage: 40 c, 93% rel. humidity storage duration: 22 h per cycle number of cycles: 3 cispr 22/en 55022, level b radiated electromagnetic emission requirements according to en 55022, class b (radiated) can be achieved by adding an external common mode choke and (for 20 imx 35 types) an additional capacitor, see: input data . the filter components should be placed as close as possible to the input of the converter. fig. 19 choke dimensions vi+ vi l v+ v module 07114 fig. 18 example for external circuitry to comply with cispr22/en 55022, level b, radiated 18 13 16 0.9 17.5 07120 table 13: input filter components for en 55022, level b, radiated. type current compensated choke 20 imx 35 murata plh 10a 7003r6p02 40 imx 35 murata plh 10a 1112r6p02 table 14: temperature specifications, valid for air pressure of 800...1200 hpa (800...1200 mbar) temperature -8 3 characteristics conditions min max unit t a ambient temperature 1 operational 2 40 85 c t c case temperature 40 105 t s storage temperature 1 non operational 55 105 1 mil-std-810d section 501.2 and 502.2 2 see: thermal considerations 3 start up at 55 c table 15: mtbf and device hours mtbf ground benign ground fixed ground mobile mtbf acc. to mil-hdbk-217f t c = 40 c t c = 40 c t c = 70 c t c = 50 c 40 imx 35-05d12-8 336'000 h 141'000 h 86'000 h 110'000 h immunity to environmental conditions
board mountable dc-dc converters imx 35 series edition 5/08.2001 r1 15/18 mechanical data dimensions in mm. tolerances 0.3 mm unless otherwise indicated. fig. 20 case imx 35 (standard) weight: approx. 70 g 63.5 76.2 63.5 0.8 x 0.8 5.08 5 10.5 09121 69.6 56.9 thread m3 t c 5.08 47.8 63.5 72.8 6.4 8.9 0.8 x 0.8 09123 option z t c 1 t c 2 european projection 6.4 9.9 09129 option y fig. 21 imx 35 open frame (option z) and 20 imx 35 triple output, open frame with base plate (option y)
board mountable dc-dc converters imx 35 series edition 5/08.2001 r1 16/18 safety and installation instructions 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. connection to the system shall be made via a printed circuit board with hole diameters of 1.5 mm for the pins. the units should be connected to a secondary circuit. check for hazardous voltages before altering any connec- tions. 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. input fuse 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 f8.0a for 20 imx 35 types, f4.8 a for 40 imx 35 types. standards and approvals all dc-dc converters are pending to be ul recognized ac- cording to ul 69950, ul recognized for canada to can/ csa c22.2 no. 950-95 and iec/en 60950 standards. the units have been evaluated for: building in supplementary 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 sub- ject to a maximum transient rating of 1500 v. 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. 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. power-one will not honour any guarantee claims resulting from electric strength field tests. table 17: electric strength test voltages characteristic input to output output to unit imx 35 output electric strength 1.2 - kv rms test voltage 1 s 1.5 0.2 kv dc insulation resistance >100 - m ? at 500 v dc partial discharge consult factory - kv extinction voltage table 18: pin allocation pin no. double triple quad output output output 1 pul pul pul 2vi vi vi 3 n.c. n.c. n.c. 4 vi+ vi+ vi+ 5 trim n.c. trim or trim1/4 6w w w 7 ref ref ref 8 sd or i sd or i sd or i 11 vo2 vo3 vo3 12 n.c. vo3+ vo3+ 13 vo2+ vo2+ vo2+ 14 n.c. vo2 vo2 15 vo1 vo1 vo1 16 n.c. n.c. vo1+ 17 vo1+ vo1+ vo4+ 18 n.c. trim1 vo4 19 n.c. n.c. n.c. fig. 22 pin allocation protection degree the protection degree of the dc-dc converters is ip 30 (not for option z). cleaning agents in order to avoid possible damage, any penetration of cleaning fluids should be prevented, since the power sup- plies are not hermetically sealed. notwithstanding this, units with opt. z leaving the factory unlqacquered may be cleaned and lacquered by the cus- tomer. 09122 1 2 3 4 5 6 7 8 11 12 13 14 15 16 17 18 19 bottom view
board mountable dc-dc converters imx 35 series edition 5/08.2001 r1 17/18 table 19: insulation concept leading to an selv output circuit conditions front end dc-dc converter result supply minimum required grade maximum minimum required type measures to achieve the safety status of voltage of isolation, to be provided dc output safety status of the specified safety status of the dc-dc by the ac-dc front end, voltage front end output the output circuit converter output including mains supplied from the circuit circuit battery charger front end 1 mains basic 60 v earthed selv circuit 2 imx 35 operational insulation selv circuit 250 v ac (provided by the dc-dc converter) 75 v hazardous voltage imx 35 input fuse 3 output sup- earthed selv secondary circuit pressor diodes 4 , and circuit earthed output circuit 2 double or reinforced 60 v selv circuit imx 35 operational insulation (provided by the dc-dc converter) 75 v double or reinforced imx 35 supplementary insulation insulated unearthed based on the maximum hazardous voltage rated output voltage from secondary circuit 5 the front end (provided by the dc-dc converter) safety of operator accessible output circuit 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 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 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 en- sure the compliance with the relevant and applicable safety regulations. more information is given in: technical infor- mation: safety . 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 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 . 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 at least basic insulation according to the relevant safety standard, based on the maximum out put 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. 23 schematic safety concept. use fuse, suppressor diode and earth connection as per table: safety concept leading to an selv output circuit .
board mountable dc-dc converters imx 35 series edition 5/08.2001 r1 18/18 option i inhibit 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 out- put (active low logic, fail safe). converter operating: 10 v...0.8 v converter inhibited or inhibit pin left open circuit: 2.4 v... u i max fig. 25 if the inhibit is not used, the inhibit pin should be con- nected to vi vi+ vi i 06138 4 8 2 description of options table 20: survey of options option function of option types y base-plated open frame 20 imx 35 triple output types only z open frame all models except 20 imx 35 triple output types i inhibit -

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