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ncs12 series isolated 12w 4:1 input single & dual output dc/dc converters kdc_ncs12c.a02 page 1 of 14 all enquiries: www.murata-ps.com/support www.murata-ps.com for full details go to www.murata-ps.com/rohs $ www.murata-ps.com selection guide order code input voltage output voltage output current load regulation ef?ciency mttf 1 positive output negative output positive output negative output nom. typical max min. typ. v v a % % % % % hrs ncs12s1203c 12 3.3 3.64 1 1.5 78 83.5 269,492 ncs12s1205c 12 5 2.40 0.5 1 85 88 313,578 NCS12S1212C 12 12 1.00 0.1 0.3 83 84.5 230,569 ncs12s1215c 12 15 0.80 0.1 0.3 83 85.5 195,596 ncs12s4803c 48 3.3 3.64 1.2 2 81 85.5 341,943 ncs12s4805c 48 5 2.40 0.5 1 85 87.5 418,117 ncs12s4812c 48 12 1.00 0.1 0.3 82 84.5 296,593 ncs12s4815c 48 15 0.80 0.1 0.3 84 85 259,485 ncs12d1205c 12 5 1.2 0.15 0.3 0.3 2 80 81.5 182,655 ncs12d1212c 12 12 0.5 0.05 0.2 0.3 1.5 83 85 158,750 ncs12d1215c 12 15 0.4 0.05 0.1 0.3 1 84 86 140,435 ncs12d4805c 48 5 1.2 0.15 0.5 0.3 2 78 80 165,931 ncs12d4812c 48 12 0.5 0.05 0.4 0.3 1 83 85 215,533 ncs12d4815c 48 15 0.4 0.05 0.4 0.3 1.5 83 85 146,257 selection guide (continued) order code input current ripple and noise 10% load 10% load 100% load typ. 12/48v typ. 24v typ. 12/48v typ. max a a a mvp/p mvp/p ncs12s1203c 0.15 0.1 1.2 60 125 ncs12s1205c 0.1 0.16 1.1 50 125 NCS12S1212C 0.1 0.06 1.2 80 125 ncs12s1215c 0.06 0.1 1.2 100 125 ncs12s4803c 0.05 0.08 0.3 100 125 ncs12s4805c 0.05 0.08 0.3 90 125 ncs12s4812c 0.03 0.06 0.3 75 125 ncs12s4815c 0.03 0.06 0.3 90 125 ncs12d1205c 0.04 0.07 1.25 35 100 ncs12d1212c 0.04 0.07 1.2 40 100 ncs12d1215c 0.05 0.07 1.5 55 100 ncs12d4805c 0.03 0.07 0.3 70 100 ncs12d4812c 0.03 0.07 0.3 84 100 ncs12d4815c 0.03 0.07 0.4 55 100 input characteristics parameter conditions min. typ. max. units voltage range 12v input types 9 24 36 v 48v input types 18 48 75 under voltage lock out turn on threshold 12v input types 8.5 v turn off threshold 12v input types 7.5 turn on threshold 48v input types 16.7 turn off threshold 48v input types 15.8 power consumption at shutdown ncs12x12 10 mw ncs12x48 100 re?ected ripple current 48v dual output types 15 ma p-p all other types 10 1 calculated using mil-hdbk-217 fn2, parts stress method with nominal input voltage at full load. all speci?cations typical at ta=25c, nominal input voltage and rated output current unless otherwise speci?ed. features ul 60950 recognition pending 4:1 wide range voltage input operating temperature range -40c to 85c typical load regulation from 0.05% 1.5kvdc isolation 3.3v, 5v, 12v & 15v outputs ul 94v-0 package materials no electrolytic capacitors thermal shutdown under voltage lock out current fold back product overview the ncs12 series of dc/dc converters offers single & dual output voltages from input voltage ranges of 9-36v and 18-75v. the ncs12 is housed in an industry standard package with a standard pinout. the ncs12 is packaged in a metal case for improved emi shielding and is also encapsulated for superior thermal performance. applications include telecommunications, battery powered systems, process control and distributed power systems.
ncs12 series isolated 12w 4:1 input single & dual output dc/dc converters kdc_ncs12c.a02 page 2 of 14 all enquiries: www.murata-ps.com/support www.murata-ps.com output characteristics parameter conditions min. typ. max. units rated power all output types 12 w minimal load to meet datasheet speci?cation 10 % voltage set point accuracy positive outputs 2 negative outputs 3 % line regulation low line to high line positive outputs 0.04 0.1 % negative outputs 0.3 1 cross regulation d1205 & d4805 4 6.5 % d1212, d1215 ,d4812, d4815 2 5 transient response peak deviation (12.5-37.5% & 37.5-12.5% swing) 5 %v out settling time (within 1% v out nom.) single output types 500 s dual output types 250 isolation characteristics parameter conditions min. typ. max. units isolation test voltage flash tested for 1 seconds 1500 vdc resistance viso = 1kvdc 1 g capacitance s1203, s1205, s4803, s4805 600 pf all other types 230 absolute maximum ratings short-circuit protection (for selv input voltages) 30 minutes control pin input voltage 18v max lead temperature 1.0mm from case for 10 seconds (to jedec jesd22-b106 iss c) 260c input voltage, ncs12 12v input types 40v input voltage, ncs12 48v input types 80v general characteristics 1 parameter conditions min. typ. max. units switching frequency s1203, s1205, s4803 & s4805 340 khz all other types 220 control pin input module on, pin unconnected or open collector ?oating module off 0.8 v temperature characteristics parameter conditions min. typ. max. units operation with derating - see derating graph -40 85 c storage -50 125 case temperature above ambient 100% load, nom v in , still air ncs12s1203c 65 ncs12s1215c, ncs12d1205c, ncs12d4805c 60 all other types 44 thermal shutdown case temperature single 3.3v & 5v outputs 135 all other types 120
ncs12 series isolated 12w 4:1 input single & dual output dc/dc converters kdc_ncs12c.a02 page 3 of 14 all enquiries: www.murata-ps.com/support www.murata-ps.com application notes output capacitance and start-up times the ncs12 series does not require output capacitors to meet datasheet speci?cation. to meet datasheet speci?cation, total outpu t capacitance should not exceed: part no. maximun load capacitance (per output) start-up times f ms ncs12s1203c 470 16 ncs12s1205c 470 22 NCS12S1212C 220 7 ncs12s1215c 220 8.5 ncs12s4803c 470 14 ncs12s4805c 470 22 ncs12s4812c 220 8 ncs12s4815c 220 8.5 ncs12d1205c 220 5 ncs12d1212c 100 8 ncs12d1215c 100 9 ncs12d4805c 220 5 ncs12d4812c 100 7.5 ncs12d4815c 100 7 technical notes isolation voltage hi pot test, flash tested, withstand voltage, proof voltage, dielectric withstand voltage & isolation test voltage are all terms that relate to the same thing, a test voltage, applied for a speci? ed time, across a component designed to provide electrical isolation, to verify the integrity of that isol ation. murata power solutions ncs12 series of dc/dc converters are all 100% production tested at their stated isolation voltage. this is 1.5kvdc for 1 second. a question commonly asked is, what is the continuous voltage that can be applied across the part in normal operation? for a part holding no speci? c agency approvals, such as the ncs12 series, both input and output should normally be maintained within selv limits i.e. less than 42.4v peak, or 60vdc. the isolation test voltage represents a measure of immunity to transient voltages and the part should never be used as a n element of a safety isolation system. the part could be expected to function correctly with several hundred volts offset applied continuously across the isolation barrier; bu t then the circuitry on both sides of the barrier must be regarded as operating at an unsafe voltage and further isolation/insulation systems must form a barrier between these circui ts and any user-accessible circuitry according to safety standard requirements. repeated high-voltage isolation testing it is well known that repeated high-voltage isolation testing of a barrier component can actually degrade isolation capability, to a lesser or greater degree depending on materials, construction and environment. the ncs12 series has an er ferrite core, with no additional insulation between primary and second ary windings of enameled wire. while parts can be expected to withstand several times the stated test voltage, the isolation capability does depend on the wire insulation. an y material, including this enamel (typically polyure- thane) is susceptible to eventual chemical degradation when subject to very high applied voltages thus implying that the number of tests should be strictly limited. we therefore strongly advise against repeated high voltage isolation testing, but if it is absolutely required, that the voltage be reduced by 20% from speci? ed test voltage. this consideration equally applies to agency recognized parts rated for better than functional isolation where the wire enamel insulation is always supplemented by a further insulation system of physical spacing or barriers. rohs compliance information this series is compatible with rohs soldering systems with a peak wave solder temperature of 260oc for 10 seconds. the pin term ination ?nish on this product series is a gold ?ash (0.05-0.10 micron) over nickel preplate. the series is backward compatible with sn/pb sol dering systems. for further information, please visit www.murata-ps.com/rohs
ncs12 series isolated 12w 4:1 input single & dual output dc/dc converters kdc_ncs12c.a02 page 4 of 14 all enquiries: www.murata-ps.com/support www.murata-ps.com characterisation test methods ripple & noise characterisation method ripple and noise measurements are performed with the following test con?guration. c1 1f x7r m ultilayer ceramic capacitor, voltage rating to be a minimum of 3 times the output voltage of the dc/dc converter c2 10f tantalum capacitor, voltage rating to be a minimum of 1.5 times the output voltage of the dc/dc converter with an esr of l ess than 100m at 100 khz c3 100nf multilayer ceramic capacitor, general purpose r1 450 resistor, carbon ?lm, 1% tolerance r2 50 bnc termination t1 3t of the coax cable through a ferrite toroid rload resistive load to the maximum power rating of the dc/dc converter. connections should be made via twisted wires measured values are multiplied by 10 to obtain the speci?ed values. differential mode noise test schematic oscilloscope y input supply c1 c2 c3 r1 t1 r2 input output dc/dc converter r load + + - -
ncs12 series isolated 12w 4:1 input single & dual output dc/dc converters kdc_ncs12c.a02 page 5 of 14 all enquiries: www.murata-ps.com/support www.murata-ps.com efficiency vs load ncs12s1203c ncs12s1205c NCS12S1212C ncs12s1215c ncs12s4803c ncs12s4805c ncs12s4812c ncs12s4815c 50 55 60 65 70 75 80 85 90 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% efficiency (%) load (%) 24v 12v 60 65 70 75 80 85 90 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% efficiency (%) load (%) 48v 24v 45 50 55 60 65 70 75 80 85 90 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% efficiency (%) load (%) 24v 12v 45 50 55 60 65 70 75 80 85 90 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% efficiency (%) load (%) 48v 24v 70 72 74 76 78 80 82 84 86 88 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% efficiency (%) load (%) 24v 12v 60 65 70 75 80 85 90 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% efficiency (%) load (%) 48v 24v 68 70 72 74 76 78 80 82 84 86 88 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% efficiency (%) load (%) 24v 12v 60 65 70 75 80 85 90 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% efficiency (%) load (%) 48v 24v
ncs12 series isolated 12w 4:1 input single & dual output dc/dc converters kdc_ncs12c.a02 page 6 of 14 all enquiries: www.murata-ps.com/support www.murata-ps.com efficiency vs load ncs12d1205c ncs12d1212c ncs12d1215c ncs12d4805c ncs12d4812c ncs12d4815c 10% 20% 30% 40% 50% 60% 70% 80% 90% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% efficiency (%) load (%) 24v 12v 10% 20% 30% 40% 50% 60% 70% 80% 90% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% efficiency (%) load (%) 48v 24v 20% 30% 40% 50% 60% 70% 80% 90% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% efficiency (%) load (%) 24v 12v 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% efficiency (%) load (%) 48v 24v 20% 30% 40% 50% 60% 70% 80% 90% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% efficiency (%) load (%) 24v 12v 5% 15% 25% 35% 45% 55% 65% 75% 85% 95% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% efficiency (%) load (%) 48v 24v
ncs12 series isolated 12w 4:1 input single & dual output dc/dc converters kdc_ncs12c.a02 page 7 of 14 all enquiries: www.murata-ps.com/support www.murata-ps.com temperature derating ncs12s1203c ncs12s1205c NCS12S1212C ncs12s1215c 0 2 4 6 8 10 12 -40-20 0 20406080 input voltage range = 9-36v still air 100 lfm 200 lfm 400 lfm 0 2 4 6 8 10 12 -40-20 0 20406080 input voltage range = 9-36v still air 100 lfm 200 lfm 400 lfm 0 2 4 6 8 10 12 -40-20 0 20406080 input voltage range = 9-36v still air 100 lfm 200 lfm 400 lfm 0 2 4 6 8 10 12 -40-20 0 20406080 input voltage range = 9-36v still air 100 lfm 200 lfm 400 lfm 0 2 4 6 8 10 12 -40-20 0 20406080 input voltage = 12v still air 100 lfm 200 lfm 400 lfm 0 2 4 6 8 10 12 -40-20 0 20406080 input voltage = 12v still air 100 lfm 200 lfm 400 lfm 0 2 4 6 8 10 12 -40-20 0 20406080 input voltage = 12v still air 100 lfm 200 lfm 400 lfm 0 2 4 6 8 10 12 -40-20 0 20406080 input voltage = 12v still air 100 lfm 200 lfm 400 lfm
ncs12 series isolated 12w 4:1 input single & dual output dc/dc converters kdc_ncs12c.a02 page 8 of 14 all enquiries: www.murata-ps.com/support www.murata-ps.com temperature derating ncs12s4803c ncs12s4805c ncs12s4812c ncs12s4815c 0 2 4 6 8 10 12 -40-20 0 20406080 input voltage range = 18-75v still air 100 lfm 200 lfm 400 lfm 0 2 4 6 8 10 12 -40-20 0 20406080 input voltage range = 18-75v still air 100 lfm 200 lfm 400 lfm 0 2 4 6 8 10 12 -40-20 0 20406080 input voltage range = 18-75v still air 100 lfm 200 lfm 400 lfm 0 2 4 6 8 10 12 -40-20 0 20406080 input voltage range = 18-75v still air 100 lfm 200 lfm 400 lfm 0 2 4 6 8 10 12 -40-20 0 20406080 input voltage = 48v still air 100 lfm 200 lfm 400 lfm 0 2 4 6 8 10 12 -40-20 0 20406080 input voltage = 48v still air 100 lfm 200 lfm 400 lfm 0 2 4 6 8 10 12 -40 -20 0 20 40 60 80 input voltage = 48v still air 100 lfm 200 lfm 400 lfm 0 2 4 6 8 10 12 -40-20 0 20406080 input voltage = 48v still air 100 lfm 200 lfm 400 lfm
ncs12 series isolated 12w 4:1 input single & dual output dc/dc converters kdc_ncs12c.a02 page 9 of 14 all enquiries: www.murata-ps.com/support www.murata-ps.com temperature derating ncs12d1205c ncs12d1212c ncs12d1215c ncs12d4805c 0 2 4 6 8 10 12 -40-20 0 20406080 input voltage range = 9-36v still air 100 lfm 200 lfm 400 lfm 0 2 4 6 8 10 12 -40-20 0 20406080 input voltage range = 9-36v still air 100 lfm 200 lfm 400 lfm 0 2 4 6 8 10 12 -40-20 0 20406080 input voltage range = 9-36v still air 100 lfm 200 lfm 400 lfm 0 2 4 6 8 10 12 -40-20 0 20406080 input voltage range = 18-75v still air 100 lfm 200 lfm 400 lfm 0 2 4 6 8 10 12 -40-20 0 20406080 input voltage = 12v still air 100 lfm 200 lfm 400 lfm 0 2 4 6 8 10 12 -40-20 0 20406080 input voltage = 12v still air 100 lfm 200 lfm 400 lfm 0 2 4 6 8 10 12 -40-20 0 20406080 input voltage = 12v still air 100 lfm 200 lfm 400 lfm 0 2 4 6 8 10 12 -40-20 0 20406080 input voltage = 48v still air 100 lfm 200 lfm 400 lfm
ncs12 series isolated 12w 4:1 input single & dual output dc/dc converters kdc_ncs12c.a02 page 10 of 14 all enquiries: www.murata-ps.com/support www.murata-ps.com temperature derating ncs12d4812c ncs12d4815c 0 2 4 6 8 10 12 -40-20 0 20406080 input voltage range 18-75v still air 100 lfm 200 lfm 400 lfm 0 2 4 6 8 10 12 -40-20 0 20406080 input voltage range = 18-75v still air 100 lfm 200 lfm 400 lfm 0 2 4 6 8 10 12 -40-20 0 20406080 input voltage = 48v still air 100 lfm 200 lfm 400 lfm 0 2 4 6 8 10 12 -40-20 0 20406080 input voltage = 48v still air 100 lfm 200 lfm 400 lfm
ncs12 series isolated 12w 4:1 input single & dual output dc/dc converters kdc_ncs12c.a02 page 11 of 14 all enquiries: www.murata-ps.com/support www.murata-ps.com emc filtering and spectra filtering the module includes a basic level of ?ltering, suf?cient for many applications. where lower noise levels are desired, ?lters ca n easily be added to achieve any required noise performance. a dc/dc converter generates noise in two principle forms: that which is radiated from its body and that conducted on its extern al connections. there are three separate modes of conducted noise: input differential, output differential and input-output. this last appears as common mode at the input and the output, and cannot therefore be removed by ?ltering at the input or outpu t alone. the ?rst level of ?ltering is to connect capacitors between input and output returns, to reduce this form of noise. it typically contains high harmonics of the switching frequency, which tend to appear as spikes on surrounding circuits. the voltage rating of this capacitor must match the required isolation voltage. (due to the great variety in isolation voltage and required noise performance, this capacitor has not been included within the converter.) input ripple is a voltage developed across the internal input decoupling capacitor. it is therefore measured with a de?ned supp ly source impedance. although simple series inductance will provide ?ltering, on its own it can degrade the stability. a shunt capacitor is therefore recommended ac ross the converter input terminals, so that it is fed from a low impedance. if no ?ltering is required, the inductance of long supply wiring could also cause a problem, requiring an input decoupling capa citor for stability. an electrolytic will perform well in these situations. the input-output ?ltering is performed by the common-mode choke on the primary. this could be placed on the output, but would then degrade the regulation and produce less bene?t for a given size, cost, and power loss. radiated noise is present in magnetic and electrostatic forms. the latter is suppressed by the metal case, which is connected t o the output return, typically a zero-volt point. thanks to the small size of these units, neither form of noise will be radiated ef?ciently, so will not normally cause a problem. any question of this kind usually better repays attention to conducted signals. emc filter and values to obtain spectra as shown c1 l1 c2 c3 dc dc c4 c5 c1, c2 1f polyester or ceramic capacitor c3 47f electrolytic capacitor c4 & c5 10nf 250 vac y rated (15nf sxx03 & sxx05) l1 1h common-mode choke (murata part number 51105c) the following ?lter circuit shows the input ?lter typically required to meet cispr22 quasi-peakcurve b.
ncs12 series isolated 12w 4:1 input single & dual output dc/dc converters kdc_ncs12c.a02 page 12 of 14 all enquiries: www.murata-ps.com/support www.murata-ps.com emc filtering and spectra ncs12s1203c ncs12s1205c NCS12S1212C ncs12s1215c ncs12s4803c ncs12s4805c ncs12s4812c ncs12s4815c 0 10 20 30 40 50 60 70 80 1.00e+05 1.00e+06 1.00e+07 1.00e+08 dbuv frequency (hz) 0 10 20 30 40 50 60 70 80 1.00e+05 1.00e+06 1.00e+07 1.00e+08 dbuv frequency (hz) 0 10 20 30 40 50 60 70 80 1.00e+05 1.00e+06 1.00e+07 1.00e+08 dbuv frequency (hz) 0 10 20 30 40 50 60 70 80 1.00e+05 1.00e+06 1.00e+07 1.00e+08 dbuv frequency (hz) 0 10 20 30 40 50 60 70 80 1.00e+05 1.00e+06 1.00e+07 1.00e+08 dbuv frequency (hz) 0 10 20 30 40 50 60 70 80 1.00e+05 1.00e+06 1.00e+07 1.00e+08 dbuv frequency (hz) 0 10 20 30 40 50 60 70 80 1.00e+05 1.00e+06 1.00e+07 1.00e+08 dbuv frequency (hz) 0 10 20 30 40 50 60 70 80 1.00e+05 1.00e+06 1.00e+07 1.00e+08 dbuv frequency (hz)
ncs12 series isolated 12w 4:1 input single & dual output dc/dc converters kdc_ncs12c.a02 page 13 of 14 all enquiries: www.murata-ps.com/support www.murata-ps.com efficiency vs load ncs12d1205c ncs12d1212c ncs12d1215c ncs12d4805c ncs12d4812c ncs12d4815c 0 10 20 30 40 50 60 70 80 1.00e+05 1.00e+06 1.00e+07 1.00e+08 dbuv frequency (hz) 0 10 20 30 40 50 60 70 80 1.00e+05 1.00e+06 1.00e+07 1.00e+08 dbuv frequency (hz) 0 10 20 30 40 50 60 70 80 1.00e+05 1.00e+06 1.00e+07 1.00e+08 dbuv frequency (hz) 0 10 20 30 40 50 60 70 80 1.00e+05 1.00e+06 1.00e+07 1.00e+08 dbuv frequency (hz) 0 10 20 30 40 50 60 70 80 1.00e+05 1.00e+06 1.00e+07 1.00e+08 dbuv frequency (hz) 0 10 20 30 40 50 60 70 80 1.00e+05 1.00e+06 1.00e+07 1.00e+08 dbuv frequency (hz)
ncs12 series isolated 12w 4:1 input single & dual output dc/dc converters kdc_ncs12c.a02 page 14 of 14 all enquiries: www.murata-ps.com/support www.murata-ps.com/support murata power solutions, inc. makes no representation that the use of its products in the circuits described herein, or the use of other technical information contained herein, will not infringe upon existing or future patent rights. the descriptions contained her ein do not imply the granting of licenses to make, use, or sell equipment constructed in accordance therewith. speci?cations are subject to chan ge without notice. ? 2013 murata power solutions, inc. murata power solutions, inc. 11 cabot boulevard, mans?eld, ma 02048-1151 u.s.a. iso 9001 and 14001 registered this product is subject to the following operating requirements and the life and safety critical application sales policy : refer to: http://www.murata-ps.com/requirements/ package specifications mechanical dimensions pin connections pin function single dual 1 control control 2-v in -v in 3-v in -v in 9 no pin 0v 11 n/c -v out 14 +v out +v out 16 0v 0v 22 +v in +v in 23 +v in +v in tube outline dimensions recommended footprint details all dimensions in inches (mm) 0.020 (0.5) except pin to pin tolerance 0.010 (0.25). all pins on a 0.100 (2.54) pitch and within 0.010 (0.25) of true position. the copper case is connected to the 0v pin(s). care is needed in the design of this circuit board on which the converter is mou nted. top side tracks must not contact the edge of the case on the underside of the unit. weight: 17g all dimensions in mm (inches) 0.25 ( 0.010). tube length 520 (20.47) all dimensions in mm (inches) 0.25 (0.010). quantity: 15 0.02 (0.5) 0.787 (20.0) 1.26 (32.0) 0.394 (10.0) 0.600 (15.24) 0.1 (2.54) 0.166-0.207 (4.21-5.26) 0.020 (0.50) 0.100 (2.54) 0.200 (5.08) bottom view 0.176-0.208 (4.46-5.27) 14 16 22 23 11 9 2 3 1 xyyww ncs12s1205c 1.000.15 (0.040.006) 23.0 (0.906) 8.5 (0.335) 20.5 (0.807) 2.54 (0.1) ? 8 holes 1.0mm 2.54 (0.1)

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