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| nph25s series isolated 25w single output dc/dc converters kdc_nph25s.h01 page 1 of 8 www.murata-ps.com www.murata-ps.com/support for full details go to www.murata-ps.com/rohs $ selection guide order code 1 nominal input voltage output voltage output current current limit ef?ciency mttf 2 recommended alternative v v a a (min.) a (max.) % khrs NPH25S2403EIC 24 3.4 7.3 7.5 11.0 81 334 uei30-033-q48n-c nph25s2403ic 24 3.4 7.3 7.5 11.0 81 334 uei30-033-q48n-c nph25s2405eic 24 5.1 5.0 5.0 7.5 84 290 uei30-050-q48n-c nph25s2405ic 24 5.1 5.0 5.0 7.5 84 290 uei30-050-q48n-c nph25s2412eic 24 12.1 2.1 2.5 3.7 86 291 uei30-120-q48n-c nph25s2412ic 24 12.1 2.1 2.5 3.7 86 291 uei30-120-q48n-c nph25s2415eic 24 15.1 1.7 2.0 3.0 87 290 uei30-150-q48n-c nph25s2415ic 24 15.1 1.7 2.0 3.0 87 290 uei30-150-q48n-c obsolete nph25s4803eic 48 3.4 7.3 7.5 11.0 83 369 uei25-033-d48p-c nph25s4803ic 48 3.4 7.3 7.5 11.0 83 369 uei25-033-d48p-c nph25s4805eic 48 5.1 5.0 5.0 7.5 85 366 uei25-050-d48p-c nph25s4805ic 48 5.1 5.0 5.0 7.5 85 366 uei25-050-d48p-c nph25s4812eic 48 12.1 2.1 2.5 3.7 88 368 uei25-120-d48p-c nph25s4812ic 48 12.1 2.1 2.5 3.7 88 368 uei25-120-d48p-c nph25s4815eic 48 15.1 1.7 2.0 3.0 89 366 contact murata nph25s4815ic 48 15.1 1.7 2.0 3.0 89 366 contact murata input characteristics parameter conditions min. typ. max. units voltage range continuous operation, 24v input types 18 24 36 v continuous operation, 48v input types 36 48 75 output characteristics parameter conditions min. typ. max. units voltage set point error 50% load 0.5 % overall voltage error case temperature -40oc to 110oc load 0% - 100%, input speci?ed range 2.5 % temperature coef?cient of output voltage (slope) 250 ppmoc deviation of output voltage temperature min-max 0.5 1 % line regulation operating voltage range, 50% load 0.1 % load regulation 0% - 100% rated load 0.5 ripple rms 70 mv isolation characteristics parameter conditions min. typ. max. units isolation test voltage flash tested for 1 second 1500 vdc resistance viso = 500vdc 1 g absolute maximum ratings input voltage, 24v input types -0.5v to 40v 3 input voltage, 48v input types -0.5v to 80v 3 output voltage -0.3v to regulated voltage output trim control -1v to +30v synchronisation/shutdown control 15v relative to input return 1. parts ending with eic have optional trim and ss pins ?tted. 2. calculated using mil-hdbk-217f with nominal input voltage at full load. 3. absolute maximum value for 30 seconds. prolonged operation may damage the product. all speci?cations typical at t a =25c, nominal input voltage and rated output current unless otherwise speci?ed. features rohs compliant high ef?ciency to 89% power density up to 1.78w/cm 3 ul94 v-0 package material industry standard pinout ul 1950 recognized non latching current limit constant 350khz frequency 1.5kv input to output isolation versatile control options continuous rating to 30w at 60oc without heatsink operation to zero load protected against load faults internal over temperature protection uses no electrolytic capacitors description the nph25s series of dc/dc converters combines ease of application with versatility. the pin pattern is based on the popular industry standard, but two additional pins may optionally be ?tted to provide a variety of features not commonly found on units of this type. high ef?ciency enables full rating to be achieved in a small package without heat- sinking, and a high surge capability will provide for start-up and transient loads, whilst being thermally protected against sustained overload. overload protection of the constant current type ensures start-up into complex load conditions. the copper case achieves ef?cient heat transfer and screening. the product range has been recog- nised by underwriters laboratory (ul) to ul 1950 for operational insulation, ?le number e151252 applies. w s s s s
nph25s series isolated 25w single output dc/dc converters kdc_nph25s.h01 page 2 of 8 www.murata-ps.com/support control characteristics parameter conditions min. typ. max. units voltage trimming range 1 at rated load, trim control at either output 10 % remote switch input (voltage relative to input negative) 1 not operating -15 0 1.5 v operating, open circuit voltage 9 10 11 start delay time from application of valid input voltage to output being in speci?- cation 25 50 ms synchronisation 1 speci?ed drive signal 320 440 khz khz switching frequency 330 350 395 temperature characteristics parameter conditions min. typ. max. units case temperature full load -40 110 oc storage absolute max. internal temperature -40 125 relative humidity non condensing 85oc 85 % thermal protection operates at case temperature 110 oc thermal characteristics ul 1950 recognition: max. permissable loads for a given ambient temperature for any nph25s model. temperature (oc) power (w) temperature (oc) power (w) 40 25.0 80 13.9 50 22.2 85 12.5 60 19.4 90 11.1 70 16.6 max. power rating with case temperature maintained by external means (e.g. forced air cooling). part number case temperature units 100oc 105oc 110oc nph25s2403xxx 24 20 15 w nph25s2405xxx 25 22 18 nph25s2412xxx 30 24 21 nph25s2415xxx 30 27 22 nph25s4803xxx 25 20 16 w nph25s4805xxx 25 24 20 nph25s4812xxx 30 29 24 nph25s4815xxx 30 30 26 thermal performance 24v input 48v input 1. optional - where ?tted. 5 f n q f s b u v s f ? $ 5 f n q f s b u v s f ? $ 0 v u q v u 1 p x f s 8 0 v u q v u 1 p x f s 8 nph25s series isolated 25w single output dc/dc converters kdc_nph25s.h01 page 3 of 8 www.murata-ps.com/support application notes output voltage adjustment v nom 3.4 5.1 12.1 15.1 s 22.2973 20.59761 28.79096 39.95902 t 10.1351 9.36255 15.42373 20.77869 r 17.9994 24.49487 94.9661 147.7314 l -1.6241 -2.48374 -5.942857 -7.990244 trim up trim down when the output voltage is trimmed up, output current must be derated so that the maximum output power is not exceeded. example to decrease output voltage of nph25s4805eic by 0.1v: set voltage the output voltage of all units is set to 100mv above nominal, to offset resistive losses and thus assist with worst case error calculations. for the eic versions, this allowance can be altered with a single ?xed resistor, connected from the trimming pin to one of the output pins. shutdown frequency control when the shutdown pin (ss) is shorted to the negative input, the converter will stop. its current consumption will then be less than 1ma at nominal supply voltage. the voltage must be less than 1.5v to ensure that the unit stops, and must be able to sink at least 1ma. the unit will restart if the control pin is left open circuit or raised to a value close to its normal open circuit voltage. this is typically 10v. note however, that the unit will not meet speci?cation while a signi?cant current drain from this pin remains. if the shutdown pin is to be connected to a long wire, it is recommended that a capacitor decouples the pin to the supply common in order to avoid the risk of injecting noise into the converter circuit. a series resistor may also be helpful. values of 10nf and 1k may be used. many nph series converters may be switched together simply by linking the primary control pins. the primary common pins must also be linked. if the primary side dc control voltage is pulled away from its open circuit voltage, the converter frequency will be changed, approximately in proportion to the voltage. with +8.5vdc voltage to ss pin, the typical switching frequency will be 300khz. if this is raised to 15vdc, the switching frequency will typically be 510khz. the frequency may thus be moved away from a sensitive value or into a safe area. deviation of at least C10% to +30% is achievable, though the ef?ciency will decline with signi?cant changes. also note that if the frequency is lowered, the switching frequency component of output ripple will increase. since the design uses no large electrolytic capacitors, any use of a lower frequency must allow for the effects of increased ripple. additional external ?ltering may be required. +v in +v out - v out trim r up nph25s the trim resistor equations are: rup = (r/vup) - s k rdown = (l x t ) - t - s k v down +v in +v out trim r down nph25s - v out r down = -2.48374 x 9.36255 - 9.36255 - 20.59761 = 203.18k ( ) -0.1 nph25s series isolated 25w single output dc/dc converters kdc_nph25s.h01 page 4 of 8 www.murata-ps.com/support application notes (continued) synchronization the converter frequency may be synchronised to an external frequency by connecting a negative going pulse to the ss pin. the dr ive signal is typically 8v to 12v amplitude and 100ns to 200ns duration. a suitable circuit consists of a cmos timer (tlc555) connected as an oscillato r or as a pulse shaper. its logic output (not the discharge output) should be connected via a 4.7nf capacitor to the converter pin. the synchronised fr equency is above the free running value. however, the free running frequency can be lowered, so that sychronisation may include frequencies near or below the natural value. an example of a practical circuit is shown below, which uses a zener diode to lower the natural frequency. several converters of t his family may be syn- chronised from the same reference provided the waveform can be maintained by the use of an adequate driver circuit. if the rise time is more than 20ns, for example, synchronisation may not be achieved over the speci?ed frequency range. for best ef?ciency, set the frequency within the speci?ed range of its natural state. 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 nph25s series of dc/dc converters are all 100% production tested at their stated isolation voltage. this is 1500 vdc for 1 second. a question commonly asked is, what is the continuous voltage that can be applied across the part in normal operation? the nph25s series has been recognized by underwriters laboratory, both input and output should normally be maintained within se lv 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 eleme nt of a safety isolation system. the part could be expected to function correctly with several hundred volts offset applied continuously across the isolation barrier; but then th e 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 circuits and any u ser-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 materi- als, construction and environment. while manufactured parts can withstand several times the stated test voltage, the isolation capability does depend on the wire insulation. any material, including this enamel (typically polyurethane) is susceptible to eventual chemical degradation when subject to very h igh 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 ab solutely required, that the voltage be reduced by 20% from speci?ed test voltage. 7 0 7 $ o ' 7 4 f u ' s f r v f o d z 3 l 7 3 l 3 3 $ q ' 7 $ o ' 7 $ o ' 7 4 4 % / ; % # ; 9 $ 7 0 7 nph25s series isolated 25w single output dc/dc converters kdc_nph25s.h01 page 5 of 8 www.murata-ps.com/support 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 a capacitor 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 across th e 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 component reference c1 c2 c3 c4 l1 l2 l3 nph25s2403 10f 100v 2.2f 63v 47f 63v 10f 25v mps 18r333c 33h 2a 4.7h nph25s2405 10f 100v 2.2f 63v 47f 63v 10f 25v mps 18r333c 33h 2a 10h nph25s2412 10f 100v 2.2f 63v not required 10f 25v mps 18r333c 33h 2a mps 49330c 33h 2.5a nph25s2415 10f 100v 2.2f 63v 47f 63v 10f 25v mps 18r333c 33h 2a mps 18r333c 33h 2.00a nph25s4803 10f 100v not required not required 10f 25v mps 18r104c 100h 1.2a 4.7h nph25s4805 10f 100v not required not required 10f 25v mps 18r104c 100h 1.2a 10h nph25s4812 10f 100v not required not required 10f 25v mps 18r104c 100h 1.2a mps 49330c 33h 2.5a nph25s4815 10f 100v not required not required 10f 25v mps 18r104c 100h 1.2a mps 18r333c 33h 2.00a c1, c2 & c4 : electrolytic capacitors c3 : polyester or ceramic capacitor emc spectra red limit line is en 55022 curve b quasi-peak average limit. $ o ' 7 " $ : s b u f e n ) " - - $ % $ % $ - o ' 7 " $ : s b u f e $ $ nph25s series isolated 25w single output dc/dc converters kdc_nph25s.h01 page 6 of 8 www.murata-ps.com/support emc filtering and spectra (continued) nph25s2403 nph25s2405 nph25s2412 nph25s2415 nph25s4803 nph25s4805 ' s f r v f o d z ) [ $ p o e v d u f e & n j t t j p o t e # v 7 ' s f r v f o d z ) [ $ p o e v d u f e & n j t t j p o t e # v 7 ' s f r v f o d z ) [ $ p o e v d u f e & n j t t j p o t e # v 7 ' s f r v f o d z ) [ $ p o e v d u f e & n j t t j p o t e # v 7 ' s f r v f o d z ) [ $ p o e v d u f e & n j t t j p o t e # v 7 ' s f r v f o d z ) [ $ p o e v d u f e & n j t t j p o t e # v 7 nph25s series isolated 25w single output dc/dc converters kdc_nph25s.h01 page 7 of 8 www.murata-ps.com/support emc filtering and spectra (continued) nph25s4812 nph25s4815 ' s f r v f o d z ) [ $ p o e v d u f e & n j t t j p o t e # v 7 ' s f r v f o d z ) [ $ p o e v d u f e & n j t t j p o t e # v 7 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 soldering systems. for further information, please visit www.murata-ps.com/rohs nph25s series isolated 25w single output dc/dc converters kdc_nph25s.h01 page 8 of 8 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 1-v in 2+v in 3* ss 4+v out 5* trim 6-v out * optional pins recommended footprint details tube outline dimensions ? ? ? ? ? ? ? ) 0 - & 4 weight: 45g all dimensions in inches 0.01 (mm 0.25mm) all pins on a 0.10 (2.54) pitch and within 0.01 (0.254) of true position * optional control pins the copper case is internally connected to the output (-v out ) pin. care is needed in the design of this circuit board on which the converter is mounted. top side tracks must not contact the edge of the case on the underside of the unit. please note that from 2010 onwards you may receive either a blue or a black case ?nish. all dimensions in inches 0.01 (mm 0.25mm) tube length: 530 (20.866) 2 (0.079) tube material: antistatic coated clear pvc tube quantity: 15 all dimensions in inches 0.01 (mm 0.25mm) * optional control pins 0.800 (20.32) 0.584 (14.84) 0.394 (10.00) 1.378 (35.00) 0.041 (1.04) 0.035 (0.90) 1.969 (50.00) 0.18 (4.50) 0.15 (3.70 ) 0.800 (20.32) 0.200 (5.08) 0.200 (5.08) 0.589 (14.96) 0.200 (5.08) * * ? 3 2 1 4 6 5 0.29 (7.34) xyyww nph25s2412ic |
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