NCS1 series isolated 1w 4:1 input single output dc/dc converters kdc_NCS1.a02 page 1 of 8 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 ef?ciency 5v or 24v input. ef?ciency 12v input. ripple and noise isolation capacitance mttf 1 nom. min. typ. min. typ. typ. max. v v ma % % % % mvp/p mvp/p pf hrs NCS1s1203sc 12 3.3 303 73 77 71 75 24 70 24 NCS1s1205sc 12 5 200 76 79 74 77 25 50 30 NCS1s1212sc 12 12 83 75 78 75 79 40 120 35 NCS1s2403sc 24 3.3 303 76 78.5 73 76 35 70 28 NCS1s2405sc 24 5 200 79 82 77 80 27 50 42 NCS1s2412sc 24 12 83 80 83 77 80 28 120 42 input characteristics parameter conditions min. typ. max. units voltage range 12v input types 4.5 12 18 v 24v input types 9 24 36 input current NCS1s12xx 5v input voltage 0.26 a 12v input voltage 0.1 NCS1s24xx 12v input voltage 0.1 24v input voltage 0.05 input ripple current NCS1s12xx 5 30 ma p-p NCS1s24xx 5 15 output characteristics parameter conditions min. typ. max. units rated power all output types 1 w minimal load to meet datasheet speci?cation 10 % voltage set point accuracy all output types 1 2 % line regulation low line to high line 0.5 % load regulation all output types 0.5 % transient response peak deviation (12.5-37.5% & 37.5-12.5% swing) 5 %v out settling time (within 5% v out nom.) 2ms isolation characteristics parameter conditions min. typ. max. units isolation test voltage flash tested for 1 minute 1000 vdc resistance viso = 1kvdc 1 g general characteristics 1 parameter conditions min. typ. max. units switching frequency 100 400 khz control pin input module on, pin unconnected or open collector ?oating module off 0.8 v 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 105c with derating ? 1 kvdc isolation ? 3.3v, 5v & 12v outputs ? no electrolytic capacitors ? continuous short circuit protection product overview the NCS1 series of dc/dc converters offers a single output voltage from input voltage ranges of 4.5-18v and 9-36v. the NCS1 is housed in an industry standard package with a standard pinout. applications include telecommunications, battery powered systems, process control and distributed power systems.
NCS1 series isolated 1w 4:1 input single output dc/dc converters kdc_NCS1.a02 page 2 of 8 all enquiries: www.murata-ps.com/support www.murata-ps.com temperature characteristics parameter conditions min. typ. max. units operation -40 105 c storage -50 125 case temperature above ambient 100% load, nom v in , still air 15 22 absolute maximum ratings short-circuit protection (for selv input voltages) continuous control pin input voltage 18v max lead temperature 1.0mm from case for 10 seconds (to jedec jesd22-b106 iss c) 260c input voltage, NCS1 12v input types 25v input voltage, NCS1 24v input types 40v application notes start-up times part no. start-up times ms NCS1s1203sc 6 NCS1s1205sc 9 NCS1s1212sc 20 NCS1s2403sc 12 NCS1s2405sc 7 NCS1s2412sc 12 control pin the NCS1 converters have a shutdown feature which enables the user to put the converter into a low power state. the control pin connects directly to the base of an internal transistor, and the switch off mechanism for the NCS1 works by forward biasing this npn transistor. if the pin is left open (high impedance), the converter will be on (there is no allowed low state for this pin), but once a control voltage is applied with suf?cient drive current, the conver ter will be switched off. a suitable application circuit is shown below. d 1 (e.g. 1n4003) is required to provide high impedence when the signal is low. from the NCS1 speci?cation, the drive current to operate this function is recom- mended to be 3ma, and hence the value of r 1 can be derived as follows: r 1 = assuming v c =5v, v d =0.7v and v q =1v: r 1 = = 1100 NCS1 v in v c ov -v in ctrl r 1 d 1 q 1 r 2 v c - v d - v q i c 5 - 0.7 - 1.0 3 x 10 -3 typical start up times for this series, with a typical input voltage rise time of 2.2s and output capacitance of 10f, are sho wn in the table below. the product series will start into a capacitance of 47f with an increased start time, however the maximum recommended output capacitance is 10f.
NCS1 series isolated 1w 4:1 input single output dc/dc converters kdc_NCS1.a02 page 3 of 8 all enquiries: www.murata-ps.com/support www.murata-ps.com 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 NCS1 series of dc/dc converters are all 100% production tested at their stated isolation voltage. this i s 1.0kvdc 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 NCS1 series, both input and output should normally be maintained wi thin 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 NCS1 series has a toroid core, with no additional insulation between primary and secondary wi ndings 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. any m aterial, including this enamel (typically polyurethane) is susceptible to eventual chemical degradation when subject to very high applied voltages thus implying that the number of tes ts 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% fr om 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 tin plate, hot dipped over matte tin with nickel preplate. the series is backward compatible with sn/ pb soldering systems. 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 + + - -
NCS1 series isolated 1w 4:1 input single output dc/dc converters kdc_NCS1.a02 page 4 of 8 all enquiries: www.murata-ps.com/support www.murata-ps.com efficiency vs load NCS1s1203sc NCS1s1205sc NCS1s1212sc NCS1s2403sc NCS1s2405sc NCS1s2412sc 0 10 20 30 40 50 60 70 80 0 102030405060708090100 efficiency (%) load (%) 4.5 vin 5 vin 12 vin 18 vin 0 10 20 30 40 50 60 70 80 90 0 102030405060708090100 efficiency (%) load (%) 9 vin 12 vin 24 vin 36 vin 0 10 20 30 40 50 60 70 80 90 0 102030405060708090100 efficiency (%) load (%) 4.5 vin 5 vin 12 vin 18 vin 0 10 20 30 40 50 60 70 80 90 0 102030405060708090100 efficiency (%) load (%) 9 vin 12 vin 24 vin 36 vin 0 10 20 30 40 50 60 70 80 90 0 102030405060708090100 efficiency (%) load (%) 4.5 vin 5 vin 12 vin 18 vin 0 10 20 30 40 50 60 70 80 90 0 102030405060708090100 efficiency (%) load (%) 9 vin 12 vin 24 vin 36 vin
NCS1 series isolated 1w 4:1 input single output dc/dc converters kdc_NCS1.a02 page 5 of 8 all enquiries: www.murata-ps.com/support www.murata-ps.com temperature derating NCS1s1203sc NCS1s1205sc NCS1s1212sc NCS1s2403sc NCS1s2405sc NCS1s2412sc 0 10 20 30 40 50 60 70 80 90 100 25 75 95 100 load (%) ambient temperature o c 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 25 75 105 load (%) ambient temperature o c 60 65 70 75 80 85 90 95 100 25 85 105 load (%) ambient temperature o c 0 10 20 30 40 50 60 70 80 90 100 25 85 95 105 load (%) ambient temperature o c 0 10 20 30 40 50 60 70 80 90 100 25 85 95 105 load (%) ambient temperature o c 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 25 75 95 100 load (%) ambient temperature o c
NCS1 series isolated 1w 4:1 input single output dc/dc converters kdc_NCS1.a02 page 6 of 8 all enquiries: www.murata-ps.com/support www.murata-ps.com emc filtering and spectra filtering the module includes a basic level of ?ltering, the following table shows the additional input capacitor and input inductor typi cally required to meet en 55022 curve a quasi-peak emc limit, as shown in the following plots. part number capacitor inductor common mode choke NCS1s1203sc 330nf 500h NCS1s1205sc 330nf 500h NCS1s1212sc 2.2f 2.2mh NCS1s2403sc 330nf 500h 700h NCS1s2405sc 330nf 500h NCS1s2412sc 330nf 500h
NCS1 series isolated 1w 4:1 input single output dc/dc converters kdc_NCS1.a02 page 7 of 8 all enquiries: www.murata-ps.com/support www.murata-ps.com emc filtering and spectra NCS1s1203sc NCS1s1205sc NCS1s1212sc NCS1s2403sc NCS1s2405sc NCS1s2412sc 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)
NCS1 series isolated 1w 4:1 input single output dc/dc converters kdc_NCS1.a02 page 8 of 8 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. ? 2014 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 1-v in 2+v in 3 control 6+v out 7-v out tube outline dimensions recommended footprint details all dimensions in millimetres (inches) 0.5 (0.020) except pin to pin tolerance 0.25 (0.010). all pins on a 2.54 (0.100) pitch and within 0.25 (0.010) of true position. weight: 3.3g all dimensions in mm (inches) 0.25 ( 0.010). all dimensions in millimetres 0.5 (inches 0.01). tube length: 5202 (20.47 inches 0.079). quantity: 23 21.87 [0.861] max 8.2 [0.323] max 11.30 [0.445] max 4.100.50 [0.1610.020] 0.500.05 [0.0200.002] 2.62 1.92 [ 0.103 0.076 ] 3.52 2.87 [ 0.139 0.113 ] 15.24 [0.600] 2 17 6 3 0.40 [0.016] min 2.54 [0.100] 0.250.05 [0 .0100.002] NCS1s1205sc xyyww 5.00 (0.1969) 12.30 (0.484) 2. 00 (0.0787) 2.00 (0.0787) 0.75 (0.0295) 0.20 (0.0079) 8.20 (0.3228) 0 .50 (0.0197) 2.54 [0.100] 2.54 [0.100] 0.1 x6 holes ? 1.15 1.00 [ ? 0.045 0.039 ]
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