board mountable dc-dc converters imp 12 series edition 5/5.2000 1/7 12 watt dc-dc converters imp 12-series input voltage range 4:1 input filter built-in high efficiency up to 82% short-circuit proof no derating 2" 2" metal case low cost summary the imp 12 series of primary controlled single transistor forward dc-dc converters have been developed for powering commercial type of electronic circuits, e.g. tel- ephone systems components, industrial controllers and small appliances. they are suitable for applications with standard battery voltages. the imp 12 converters feature good efficiency and good dynamic response to load changes and at start-up. the imp 12 modules are short-cir- cuit proof. 51 2.0" 51 2.0" 12 0.47" type survey and key data table 1: type survey output 1 output 2 output 3 output power input voltage efficiency 1 type designation u o nom i o nom u o nom i o nom u o nom i o nom t a = 71 c u i min ... u i max h min [v] [ma] [v] [ma] [v] [ma] p o nom [w] [v dc] [%] 5 2400 - - - - 12 10...36 77 24 imp 12-05-7 5 2400 - - - - 18...72 48 imp 12-05-7 12 1000 - - - - 10...36 24 imp 12-12-7 12 1000 - - - - 18...72 48 imp 12-12-7 15 800 - - - - 10...36 24 imp 12-15-7 15 800 - - - - 18...72 48 imp 12-15-7 +5 +1200 ? ?200 - - 10...36 24 imp 12-0505-7 +5 +1200 ? ?200 - - 18...72 48 imp 12-0505-7 +12 +500 ?2 ?00 - - 10...36 24 imp 12-1212-7 +12 +500 ?2 ?00 - - 18...72 48 imp 12-1212-7 +15 +400 ?5 ?00 - - 10...36 24 imp 12-1515-7 +15 +400 ?5 ?00 - - 18...72 48 imp 12-1515-7 +5 1500 +12 +200 ?2 ?00 10...36 24 imp 12-051212-7 +5 1500 +12 +200 ?2 ?00 18...72 48 imp 12-051212-7 +5 1500 +15 +160 ?5 ?60 10...36 24 imp 12-051515-7 +5 1500 +15 +160 ?5 ?60 18...72 48 imp 12-051515-7 1 efficiency at u i nom and i o nom table of contents page summary .......................................................................... 1 type survey and key data .............................................. 1 type key .......................................................................... 2 functional descripion ....................................................... 2 electrical input data ......................................................... 2 page electrical output data ...................................................... 3 electromagnetic compatibility (emc) .............................. 5 immunity to environmental conditions ............................. 5 mechanical data .............................................................. 5 safety and installation instructions .................................. 6 input voltage range up to 72 v dc 1, 2 or 3 outputs up to 30 v dc 1500 v dc i/o electric strength test voltage
board mountable dc-dc converters imp 12 series edition 5/5.2000 2/7 type key type key 24 imp 12 - 12 12 -7 nominal input voltage in volt ................................... 24...48 series ........................................................................... imp nominal output power in watt ......................................... 12 nominal output voltage for output 1 in volt .............. 05...15 nominal output voltage for output 2 in volt .............. 05...15 nominal output voltage for output 3 in volt .............. 12...15 operational ambient temperature range t a 25...71 c .................................................. -7 vi+ vo vi vo+ control shunt diode, filter com 03035 ref. vi+ vo vi vo+ control shunt diode, filter com 03035 ref. fig. 2 dual output converter block diagram fig. 1 single output converter block diagram functional descripion electrical input data general condition: t a = 25 c unless otherwise specified. table 2: input data input 24 imp 12 48 imp 12 characteristics conditions min typ max min typ max unit u i input voltage range t a min ... t a max 10 36 18 72 v dc u i nom nominal input voltage i o = 0... i o nom 24 48 u i abs input voltage 0 45 0 75 without damage i i 0 no load input current u i nom , i o = 0 15 25 ma i i l input current limitation u i nom , full load 1.25 p i nom 1.25 p i nom w response u i rev reverse input voltage u i = negative or shunt diode shunt diode protection reverse polarity use external fuse use external fuse vi+ vo2+ vi vo1+ ref. control shunt diode, filter com 03066 vo3 sd fig. 3 triple output converter block diagram
board mountable dc-dc converters imp 12 series edition 5/5.2000 3/7 electrical output data general condition: t a = 25 c unless otherwise specified. table 3a: output data for single output types output .. imp 12-05 .. imp 12-12 .. imp 12-15 characteristics conditions min typ max min typ max min typ max unit u o output voltage u i nom , i o nom 4.90 5.10 11.76 12.24 14.70 15.30 v i o nom nominal output current u i min ... u i max 2400 1000 800 ma u o output voltage noise u i nom 100 240 300 mv pp (0.2...1) i o nom (bw = 20 mhz) d u o u static line regulation u i min ... u i max 1 1 1% i o nom d u o i static load regulation u i min ... u i max 2 2 2 (0.2...1) i o nom t r transient recovery time i o nom ? 1 / 2 500 500 500 s a uo temperature coefficient u i nom , i o nom 0.02 0.02 0.02 %/k f s switching frequency 200 200 200 khz table 3b: output data for dual output types output .. imp 12-0505 .. imp 12-1212 .. imp 12-1515 characteristics conditions min typ max min typ max min typ max unit u o output voltage u i nom , i o nom 4.90 5.10 11.76 12.24 14.70 15.30 v i o nom nominal output current u i min ... u i max 1200 500 400 ma u o output voltage noise u i nom 100 240 300 mv pp (0.2...1) i o nom (bw = 20 mhz) d u o u static line regulation u i min ... u i max 1 1 1% i o nom d u o i static load regulation u i min ... u i max 5 5 5 (0.2...1) i o nom t r transient recovery time i o nom ? 1 / 2 500 500 500 s a uo temperature coefficient u i nom , i o nom 0.02 0.02 0.02 %/k f s switching frequency 200 200 200 khz table 3c: output data for triple output types output .. imp 12-051212-7 output 1 output 2 output 3 unit characteristics conditions min typ max min typ max min typ max u o output voltage u i nom , i o nom 4.90 5 5.10 11.28 12 12.72 -11.28 -12 -12.72 v i o nom nominal output current u i min ... u i max 200 1500 40 200 40 200 ma u o output voltage noise u i nom 100 240 240 mv pp (0.2...1) i o nom (bw = 20 mhz) d u o u static line regulation u i min ... u i max 2 6 6% i o nom d u o i static load regulation u i min ... u i max 2 6 6 (0.2...1) i o nom t r u o i transient recovery time i o nom ? 1 / 2 500 500 500 s a uo temperature coefficient u i nom , i o nom 0.02 0.02 0.02 %/k f s switching frequency 200 200 200 khz
board mountable dc-dc converters imp 12 series edition 5/5.2000 4/7 table 3d: output data for triple output types output .. imp 12-051515-7 output 1 output 2 output 3 unit characteristics conditions min typ max min typ max min typ max u o output voltage u i nom , i o nom 4.90 5 5.10 14.10 15 15.90 -14.10 -15 -15.90 v i o nom nominal output current u i min ... u i max 200 1500 32 160 32 160 ma u o output voltage noise u i nom 100 300 300 mv pp (0.2...1) i o nom (bw = 20 mhz) d u o u static line regulation u i min ... u i max 2 6 6% i o nom d u o i static load regulation u i min ... u i max 2 6 6 (0.2...1) i o nom t r u o i transient recovery time i o nom ? 1 / 2 500 500 500 s a uo temperature coefficient u i nom , i o nom 0.02 0.02 0.02 %/k f s switching frequency 200 200 200 khz connection in series the outputs of one or more units can be connected in se- ries. no suppressor diodes are required. power-one how- ever recommends to protect each individual output with a zener diode or preferably a suppressor diode, to avoid re- verse polarity that may occur if the output voltages do not rise simultaneously. connection in parallel the outputs of several units can be connected in parallel. however, the use of a single unit with a higher power rating is a better choice because of uneven power distribution among the outputs connected in parallel. it is recom- mended to select converters to be connected in parallel with very small output voltage differences at full load (i.e. < 1%). a decoupling diode is not required but recom- mended. thermal considerations if a converter is operated, the relationship between the am- bient temperature t a and the case temperature t c depends heavily on the conditions of operation and integration into a system. the thermal conditions are influenced by input volt- age, output current, airflow, temperature of surrounding components and surfaces and the properties of the printed circuit board. the specified maximum ambient temperature t a max is therefore only an indicative value and under practi- cal 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 speci- fied maximum value. the installer must ensure that un- der all operating conditions t c remains within the limits stated in the table: temperature specifications. sd-input the output voltages is turned on if the sd pin is floating or a voltage of 8...10 v dc is applied. if the voltage at the sd pin is between 0.3 and 2 v dc, the output voltage is turned off. protection scheme the imp series is continuously short circuit protected by means of input power limitation. the unit will not be dam- aged if started up into a short circuit. after removal of the short circuit, it will resume normal operation. the imp series is also no-load proof, meaning that the regulation is still effective with no load and the output volt- age does not rise. however, due to component tolerances, oscillation could occur and ripple and noise can be outside of specified values. if the converter is used in senitive elec- tronic circuits with no-load conditions, it is recommended to pre-load the outputs with at least 20% of the specified nomi- nal load. unit 1 unit 2 + u o u o vo+ com vo vo+ com vo 05090 fig. 4 outputs connected in series
board mountable dc-dc converters imp 12 series edition 5/5.2000 5/7 electromagnetic compatibility (emc) filter recommendations for compliance with cispr 22/en 55022, class b electromagnetic emission requirements according to en 55022, class b can be easely achieved by adding an exter- nal input filter consisting of three additional capacitors and one common mode ring core choke. the filter components should be placed as close as possi- ble to the input of the converter. table 4: input filter components input voltage c 1 c 2 type l 1 type c i type 24 v dc 3.3 f 3.3 f siemens 5.6 mh siemens 3.3 f siemens 50 v 50 v b 32529- b 82723 50 v b 32529- c5335-k a2202-n1 c5335-k 48 v dc 2.2 f 1 2.2 f 1 siemens 2.2 mh siemens 1 f siemens 100 v 100 v b 32522- b 82722 100 v b 32522- c1225-k a2202-n1 c1105-k 1 only valid for input voltages up to 60 v dc. fig. 5 input filter arrangement c 1 c 2 l 1 vi+ vi c i 07028 immunity to environmental conditions thermal considerations table 5: temperature specifications, valid for air pressure of 800...1200 hpa (800...1200 mbar) temperature standard -7 characteristics conditions min max unit t a ambient temperature u i nom 25 71 c t c case temperature i o = 0... i o nom 25 85 t s storage temperature non operational 40 100 table 6: mtbf mtbf ground benign ground fixed ground mobile mtbf according to mil-hdbk-217f, n2 40 c40 c70 c50 c 2'703'000 h 661'000 h 277'000 h 300'000 h
board mountable dc-dc converters imp 12 series edition 5/5.2000 6/7 table 7: electric strength test voltages, clearance and creepage distances characteristic input to output unit electric strength 1.1 kv rms test voltage 1 s 1.5 kv dc coupling capacitance 400 pf isulation resistance >1000 m ? at 500 v dc safety and installation instructions installation instruction 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 according to: mechanical data . the units should be connected to a secondary circuit. check for hazardous voltages before altering any connec- tions. 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. standards and approvals the units have been evaluated for: building in operational insulation input to output 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. 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 f3.15a for 24 imp 12 types and f1.6a for 48 imp 12 types. cleaning agents in order to avoid possible damage, any penetration of cleaning fluids is to be prevented, since the power supplies are not hermetically sealed. protection degree the protection degree of the dc-dc converters is ip 40. 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. 12 min. 5 1 50.8 20.32 15.24 15.24 vo+ 50.8 5.08 22.86 10.2 10.2 vi vi+ vo 09035 measuring point of case temperature t c com fig. 6 case 2 2" for single or dual output weight: 70 g mechanical data dimensions in mm. tolerances 0.3 mm unless otherwise specified. 12 min. 5 1 50.8 45.72 vo2+ 50.8 5.08 12.7 vi vi+ vo3- 09047 5 x 10.16 10.16 sd com vo1+ measuring point of case temperature t c fig. 7 case 2 2" for triple output types weight: 70 g european projection
board mountable dc-dc converters imp 12 series edition 5/5.2000 7/7 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 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 30 v. however, it is the sole responsibility of the installer to as- sure the compliance with the relevant and applicable safety regulations. more information is given in technical informa- tion: safety . table 8: insulation concept leading to an selv output circuit conditions front end dc-dc converter result supply minimum required grade 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, voltage 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 earthed output circuit 2 earthed selv double or reinforced insu- input fuse 3 and output selv circuit lated unearthed hazardous suppressor diodes 4 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 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 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. 8 schematic safety concept. use fuse, suppressor diode and earth connection as per table safety concept leading to an selv output circuit .
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