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cme series isolated 0.75w single output isolated dc/dc converters kdc_cme.b01 page 1 of 11 www.murata-ps.com www.murata-ps.com/support for full details go to www.murata-ps.com/rohs $ selection guide order code nominal input voltage output voltage output current input current at rated load load regulation ripple & noise ef?ciency isolation capacitance mttf 1 v v ma ma % mv p-p % pf mil. tel. typ. max. typ. max. min. typ. khrs CME0505DC 5 5 150 218 10 12 15 25 67 70 30 3400 cme0505sc 5 5 150 218 10 12 15 25 67 70 30 3400 cme0512sc 5 12 63 195 5 7 20 30 72 77 33 2200 3kvdc isolation options cme0303s3c 3.3 3.3 227 300 9 12 15 25 66 73 30 1230 cme0305s3c 3.3 5 150 300 9 12 15 25 68 73 35 630 cme0505s3c 5 5 150 218 9 12 15 25 65 70 28 2400 cme0512s3c 5 12 63 200 5 7 10 15 70 75 30 630 short circuit protection options cme0505spc 5 5 150 195 7.5 9 11 25 74 76.5 22 2887 47047 cme0505dpc 5 5 150 195 7.5 9 11 25 74 76.5 22 2887 47047 input characteristics parameter conditions min. typ. max. units voltage range continuous operation, 3.3v input types 2.97 3.3 3.63 v continuous operation, 5v input types 4.5 5.0 5.5 input short circuit current short circuit variants 95 ma input re?ected ripple current 3.3v input types 1.5 2 ma p-p 5v input types 2 2.5 short circuit types 3 15 output characteristics parameter conditions min. typ. max. units rated power 2 t a =-40c to 85c, see derating graphs 0.75 w voltage set point accuracy see tolerance envelope line regulation high v in to low v in ; short circuit types 1.15 1.2 %/% high v in to low v in ; all other output types 1.0 1.2 isolation characteristics parameter conditions min. typ. max. units isolation test voltage c versions flash tested for 1 second 1000 vdc 3c versions flash tested for 1 second 3000 resistance viso= 1000vdc 10 g general characteristics parameter conditions min. typ. max. units switching frequency cme0505xc 120 khz short circuit types 91 all other types 135 absolute maximum ratings lead temperature 1.5mm from case for 10 seconds 260c input voltage v in , 3.3v input 5.5v input voltage v in , 5v input 7v 1. calculated using mil-hdbk-217 fn2 and telcordia sr-332 calculation model with nominal input voltage at full load. 2. see derating curve. all speci?cations typical at t a =25c, nominal input voltage and rated output current unless otherwise speci?ed. product overview the cme series are a cost effective 0.75w dc/dc converter series, in industry standard packages with industry standard pinout, popular input and output voltages are available as a lower power alternative to a 1w dc/dc converter. the galvanic isolation allows the device to be con?gured to provide an isolated negative rail in systems where only positive rails exist. the wide temperature range guarantees startup from C40c and full 0.75 watt output at 85c. for the short circuit protected parts (pc) protection is continuous and auto-resetting on removal of the short circuit. features ? short circuit protection options ? ul 60950 recognised ? single isolated output ? 1kvdc or 3kvdc option hi pot test ? wide temperature performance at full ? 0.75w load -40c to 85c ? industry standard pinout ? 3.3v and 5v inputs ? 3.3v, 5v & 12v outputs ? pin compatible with lme, mee1, mee3, nke, nme, & nml series
cme series isolated 0.75w single output isolated dc/dc converters kdc_cme.b01 page 2 of 11 www.murata-ps.com/support temperature characteristics parameter conditions min. typ. max. units speci?cation all output types -40 85 c storage -50 130 case temperature rise above ambient 3.3v & 5v output types 41 12v output types 32 short circuit types (dip) 23 short circuit types (sip) 24 cooling free air convection 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 isola tion. murata power solutions cme series of dc/dc converters are all 100% production tested at their stated isolation voltage. this is 1kvdc for 1 second for c versions and 3kvdc for 1 second for 3c versions. a question commonly asked is, what is the continuous voltage that can be applied across the part in normal operation? the cme has been recognised by underwriters laboratory for functional insulation, both input and output should normally be main tained 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 an element of a safety isolation system. the part could be expected to function correctly with several hundred volts offset applied continuously across the isolation ba rrier; but 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 c ircuits 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 cme series has toroidal isolation transformers, with no additional insulation between primary and secondary 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 insu lation. any material, including this enamel (typically polyurethane) 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 b e 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. safety approval the cme series has been recognised by underwriters laboratory (ul) to ul 60950 for functional insulation in a maximum ambient t emperature of 85oc and/or case temperature limit of 100oc for cmexxxxxc, 130oc for cmexxxxs3c. case temperature measured on the face opposite the pins. the cme series of converters are not internally fused so to meet the requirements of ul 60950 an anti-surge input line fuse sho uld always be used with ratings as de?ned below. cme03xxs3c: 0.9a cme05xxxxc: 0.5a all fuses should be ul recognized and rated to 125v. file number e151252 applies.
cme series isolated 0.75w single output isolated dc/dc converters kdc_cme.b01 page 3 of 11 www.murata-ps.com/support rohs compliance information this series is compatible with rohs soldering systems with a peak wave solder temperature of 260c for 10 seconds. the pin term ination ?nish on the sip package type is tin plate, hot dipped over matte tin with nickel preplate. the dip types are matte tin over nickel p replate. both types in this series are backward compatible with sn/pb soldering systems. for further information, please visit www.murata-ps.com/rohs temperature derating graphs 150 100 50 0 -40 0 0.75 safe operating area 85c ambient temperature (c) output power (w) 150 100 50 0 -40 0 0.75 safe operating area 85c ambient temperature (c) output power (w) 120c 0303, 0305 & short circuit types. all other types.
cme series isolated 0.75w single output isolated dc/dc converters kdc_cme.b01 page 4 of 11 www.murata-ps.com/support efficiency vs load cme0505xc cme0512sc cme0303s3c cme0305s3c cme0505s3c cme0512s3c
cme series isolated 0.75w single output isolated dc/dc converters kdc_cme.b01 page 5 of 11 www.murata-ps.com/support tolerance envelopes 3.3v output types: 5v output types: 100 75 50 25 10 -2% +8% output load current (%) output voltage -10% 0% v nom +12% output load current (%) output voltage -4% +4% v nom 100 75 50 25 10 the voltage tolerance envelope shows typical load regulation characteristics for this product series. the tolerance envelope is the maximum output voltage variation due to changes in output loading. +8% output load current (%) output voltage -3% +3% v nom 100 75 50 25 10 12v output types: +4% +2% output load current (%) -3% +2% 100 +10% output voltage +5% 75 50 25 10 v nom short circuit types: efficiency vs load continued cme0505xpc 0 10 20 30 40 50 60 70 80 90 0 102030405060708090100110 efficiency (%) load (%)
cme series isolated 0.75w single output isolated dc/dc converters kdc_cme.b01 page 6 of 11 www.murata-ps.com/support application notes minimum load the minimum load to meet datasheet speci?cation is 10% of the full rated load across the speci?ed input voltage range. lower th an 10% minimum loading will result in an increase in output voltage, which may rise to typically double the speci?ed output voltage if the output load falls to less than 5%. capacitive loading and start up 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. 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 + + - - typical start-up wave form start-up time s CME0505DC 1000 cme0505sc 1000 cme0512sc 5600 cme0303s3c 540 cme0305s3c 1300 cme0505s3c 1080 cme0512s3c 5000 cme0505xpc 350
cme series isolated 0.75w single output isolated dc/dc converters kdc_cme.b01 page 7 of 11 www.murata-ps.com/support application notes (continued) output ripple reduction by using the values of inductance and capacitance stated, the output ripple at the rated load is lowered to 5mv p-p max. component selection capacitor: it is required that the esr (equivalent series resistance) should be as low as possible, ceramic types are recommend ed. the voltage rating should be at least twice (except for 15v output), the rated output voltage of the dc/dc converter. inductor: the rated current of the inductor should not be less than that of the output of the dc/dc converter. at the rated cur rent, the dc resistance of the inductor should be such that the voltage drop across the inductor is <2% of the rated voltage of the dc/dc converter. the srf (self reso nant frequency) should be >20mhz. dc dc l c load power source inductor capacitor l, h smd through hole c, f CME0505DC 47 82473c 11r473c 4.7 cme0505sc 47 82473c 11r473c 4.7 cme0512sc 68 82683c 11r683c 1 cme0303s3c 10 82103c 11r103c 4.7 cme0305s3c 47 82473c 11r473c 4.7 cme0505s3c 10 82103c 11r103c 4.7 cme0512s3c 68 82683c 11r683c 0.68 cme0505xpc 22 82223c 11r223c 1
cme series isolated 0.75w single output isolated dc/dc converters kdc_cme.b01 page 8 of 11 www.murata-ps.com/support emc filtering and spectra filtering the following ?lter circuit and ?lter table shows the input ?lters typically required to meet en 55022 curve b, quasi-peak emc limit, as shown in the following plots. the following plots show positive and negative quasi peak and cispr22 average limit b (pink line) and quasi peak limit b (green lin e) adherence limits. inductor capacitor part number l, h smd through hole c, f cme0505xc cme0512sc cme0303s3c cme0305s3c cme0505s3c cme0512s3c cme0505xpc 10 82103c 13r103c 1 cme0505xc cme0512sc cme0303s3c cme0305s3c dc dc c l
cme series isolated 0.75w single output isolated dc/dc converters kdc_cme.b01 page 9 of 11 www.murata-ps.com/support emc filtering and spectra cme0505s3c cme0512s3c cme0505xpc 0 10 20 30 40 50 60 70 80 1.00e+05 1.00e+06 1.00e+07 1.00e+08 dbuv frequency (hz)
cme series isolated 0.75w single output isolated dc/dc converters kdc_cme.b01 page 10 of 11 www.murata-ps.com/support package specifications all dimensions in mm (inches) controlling dimension is mm. all pins on a 2.54 (0.100) pitch and within 0. l (0.004) of true position from pin l at seating plane s weight: 1.09g (3c) 1.30g (sc) 1.38g (dc) 1.5g (dpc) 3c package dc package pin connections - 8 pin dip pin function 1-v in 4+v in 5+v out 7-v out sc package pin connections - 4 pin sip pin function 1-v in 2+v in 3-v out 4+v out 1 11.60.15 [0.4570.006] 6.90.15 [0.2720.006] 4.100.5 [0.1610.020] 1.140.25 [0.0450.010] 1.990.25 [0.0780.010] 9.90.15 [0.3900.006] 5.08 [0.200] 0.50.05 [0.0200.002] 0.250.05 [0.0100.002] 7.62 [0.300] 7.62 [0.300] 7 4 5 11.530.2 [0.4540.008] 10.000.25 [0.3940.010] 0.40 [0.016] min 4.100.5 [0.1610.020] (1.13 [0.044]) (2.21 [0.087]) 6.10 +0.15 -0.20 [ 0.240 +0.006 -0.008 ] 2.54 [0.100] 0.500.05 [0.0200.002] 0.250.05 [0.0100.002] 1234 s u s c
cme series isolated 0.75w single output isolated dc/dc converters kdc_cme.b01 page 11 of 11 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. ? 2016 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 (continued) recommended footprint details tube outline dimensions 8 pin dip package 4 pin sip package tube quantity(dc&sc): 35 (3c) : 40 unless otherwise speci?ed all dimensions in mm [inches] 0.55mm [0.022]. tube length (dc&sc): 520mm [20.472] 2.0 [0.079]. tube length (3c): 525mm [20.669] 2.0 [0.079]. 2.54 (0.1) 2.54 (0.1) 1.15 (0.0453) 1.00 (0.0394) 0.1 (0.00394) 4 holes ? 9.3 [0.366] 14.8 [0.583] 4.45 [0.175] 7.7 [0.303] 12.0 [0.472] 14.5 [0.571] 5.071.10[0.2000.04] 5.05 [0.199] 5.0 [0.197] 12.43 [0.489] 18.0 [0.709] 9.3 [0.366] 3c sip 4 pin sip 8 pin dip package 2.54 [0.100] 2.54 [0.100] x4 holes ? 1.15 1.00 [ ? 0.045 0.039 ]

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