the copyright and authority for the interpretation of the products are reserved by mornsun wrf_mt-3w 2013.06.26-a/1 page 1 of 6 wrf_mt-3w series 3w wide input, isolated & regulated single output , dc-dc converter patent protected rohs part number system wrf2405mt-3w product series input voltage output voltage package rated power features efficiency up to 83% 2:1 wide input voltage range operating temperature range: -40 ~ +85 no power derating ( 85) 3.0kvdc isolation ultra-miniature, smd package short circuit protection(automatic recovery) low no-load power consumption external on/off control application the wrf_mt- 3w series are specially designed for applications where a wide range input voltage power supplies are isolated from the input power supply in a distributed power supply system on a circuit board. for these dc-dc converters, you can reduce the design point of failure and save the development of micro power supply s manpower, material and time costs, also better ensure product quality stability, protect safety and reliability of the end of products. these products apply to where: 1) input voltage range 2:1; 2) 3.0kvdc input and output isolation; 3) regulated and low ripple noise is required. selection guide input voltage(vdc) output current (ma) input current (ma)(typ.) model nominal (range) max. output voltage (vdc) max. min. @max. load @no load reflected ripple current (ma,typ.) max. capacitive load ( f) efficiency (%, typ.) @max. load wrf1203mt-3w 3.3 909 45 342 2700 74 WRF1205MT-3W 5 600 30 323 2200 77 wrf1212mt-3w 12 250 12 316 680 79 wrf1215mt-3w 12 (9-18) 20 15 200 10 316 20 30 470 79 wrf2403mt-3w 3.3 909 45 166 2700 74 wrf2405mt-3w 5 600 30 156 2200 81 wrf2412mt-3w 12 250 12 152 680 82 wrf2415mt-3w 15 200 10 152 470 82 wrf2424mt-3w 24 (18-36) 40 24 125 6 157 7 110 330 80 wrf4803mt-3w 3.3 909 45 84 2700 74 wrf4805mt-3w 5 600 30 78 2200 80 wrf4812mt-3w 12 250 12 74 680 83 wrf4815mt-3w 48 (36-75) 80 15 200 10 74 7 45 470 83 note: .absolute maximum rating without damage on the converter. input specifications item test conditions min. typ. max. unit 12vdc input -0.7 -- 25 24vdc input -0.7 -- 50 input surge voltage (1sec. max.) 48vdc input -0.7 -- 100 12vdc input 4.5 -- 9 24vdc input 11 -- 18 start-up voltage 48vdc input 24 -- 36 vdc input filter capacitor
the copyright and authority for the interpretation of the products are reserved by mornsun wrf_mt-3w 2013.06.26-a/1 page 2 of 6 models on ctrl open or be insulated ctrl* models off connect high level vol tage,and ensure the current into ctrl to be 5-10ma note: *please refer to "design considerations" as the direction for use of ctrl . output specifications item test conditions min. typ. max. unit output voltage accuracy 5% to 100% load -- 1 3 no-load output voltage accuracy input voltage range -- 1.5 5 line regulation full load, input voltage from low to high -- 0.2 0.5 load regulation 5% to 100% load -- 0.2 0.8 % transient recovery time -- 0.5 3 ms transient response deviation 25% load step change -- 2.5 5 % temperature coefficient 100% load -- 0.02 0.03 %/ c ripple* -- 30 45 noise* 20mhz bandwidth -- 45 100 mvp-p output short circuit protection input voltage range continuous, automatic recovery note:* ripple and noise tested with parallel cable method. see detailed operation instructions at dc-dc application notes. common specifications item test conditions min. typ. max. unit isolation voltage input-output, tested for 1 minute, leakage current less than 1 ma 3000 -- -- vdc isolation resistance input-output, test at 500vdc 1000 -- -- m isolation capacitance input-output,100khz / 0.1v -- 35 45 pf switching frequency(pfm mode) 100% load, nominal input voltage -- 250 -- khz mtbf mil-hdbk-217f@25 1000 -- -- k hours case material epoxy resin (ul94-v0) weight -- 4.8 -- g environme ntal specifications item test conditions min. typ. max. unit storage humidity non condensing -- -- 95 % operating temperature power derating (above85 ,see figure 5) -40 -- 85 storage temperature -55 -- 125 temp. rise at full load ta=25 c -- 25 -- lead temperature 1.5mm from case for 10 seconds -- -- 300 c cooling free air convection emc specifications ce cispr22/en55022 class b(recommended circuit refer to figure1- or figure 3) emi re cispr22/en55022 class b(recommended circuit refer to figure1- or figure 3) esd iec/en61000-4-2 contact 4kv/ air 8kv perf. criteria b rs iec/en61000-4-3 10v/m perf. criteria a iec/en61000-4-4 2kv (recommended circuit refer to figure1- ) perf. criteria b eft iec/en61000-4-4 4kv (recommended circuit refer to figure 3) perf. criteria b surge iec/en61000-4-5 2kv (recommended circuit refer to figure1- or figure 3) perf. criteria b cs iec/en61000-4-6 3 vr.m.s perf. criteria a ems voltage dips, short and interruptions immunity iec/en61000-4-29 0%-70% perf. criteria b
the copyright and authority for the interpretation of the products are reserved by mornsun wrf_mt-3w 2013.06.26-a/1 page 3 of 6 emc recommended circuit ldm2 c0 tvs ldm1 mov fuse c1 + vin gnd +vo 0v eut load c2 cy ctrl cd d1 r ctrl vin gnd (figure 1) recommended external circuit parameters: model vin:12v vin:24v vin:48v fuse slow blow ,choose according to actual input current mov -- s14k35 s14k60 ldm1 -- 56 h 56 h tvs smcj28a smcj48a smcj90a c0 680uf/50v 330 f/50v 330 f/100v c1 4.7 f/50v 4.7 f/100v ldm2 12 h c2 4.7 f/50v 4.7 f/100v cy 1nf/3kv d1 rb160m-60/1a r follows: 300 - 0 . 1 - - c d c i v v r = cd 47nf/100v note: 1. in figure 1, part is the recommended external circuit for ems, and part is for emi. choose according to requirements; 2. if there is no recommended parameters, the model no require the external component; 3. vc is the voltage between ctrl and gnd, vd is the forward conduction voltage drop of d1, ic is the current through ctrl pin which is normally 5-10ma, the external circuit of ctrl is as shown in figure1- . emc recommended circuit pcb layout (figure 2) note: the pad space between input and output gnd (cy) must be 2mm. emc module application circuit eut gnd ctrl -vo +vo -vin +vin ft-a/bx1d load 0v +vo vin cd d1 r ctrl c + -vin +vin fuse ldm c1 ft-a/bx1d is mornsun s eft suppresser. for specific model, please refer to the selection guide. for nominal voltage <48v,c 330 f/50v for nominal voltage =48v,c 330 f/100v ldm=12uh,c1=1nf/3000v (figure 3)
the copyright and authority for the interpretation of the products are reserved by mornsun wrf_mt-3w 2013.06.26-a/1 page 4 of 6 emc module recommended circuit pcb layout (figure 4) emi test waveform (nominal and full load) wrf2405mt-3w ce ( class b, positive line ) wrf2405mt-3w ce ( class b, negative line ) product typical performance curve tolerance envelope graph 120 100 80 60 40 20 0 -40 0 40 85 105120 o u t p u t p o w e r p e r c e n t ( % ) output current percent(%) ambient temp.() temperature derating graph safe operating area (figure 5) 0 50 100 150 200 250 time (sec.) t e m p e r a t u r e ( ) peak.temp 240 10sec max. 60 max (>220) sec 220 . note: the curve only applies to the hot air reflow soldering efficiency vs input voltage curve (full load) 50 55 60 65 70 75 80 85 90 95 100 18202224262830323436 input voltage(v) efficiency(%) wrf2405mt-3w efficiency vs output load curve (vin=vin-nominal) 0 10 20 30 40 50 60 70 80 90 100 102030405060708090100 total output current (%) efficiency(%) wrf2405mt-3w efficiency vs input voltage curve (full load) 50 55 60 65 70 75 80 85 90 95 100 36424548546066697275 input voltage(v) efficiency(%) wrf4815mt-3w efficiency vs output load curve (vin=vin-nominal) 0 10 20 30 40 50 60 70 80 90 100 102030405060708090100 total output current (%) efficiency(%) wrf4815mt-3w
the copyright and authority for the interpretation of the products are reserved by mornsun wrf_mt-3w 2013.06.26-a/1 page 5 of 6 dimensions recommended footprint & packaging test configurations input reflected-ripple current test setup input reflected-ripple current is measured with an inductor lin and capacitor cin to simulate the source impedance. dc cin lin dc load oscilloscope current probe lin(4.7 h) cin(220 f, esr < 1.0 at 100 khz)
the copyright and authority for the interpretation of the products are reserved by mornsun wrf_mt-3w 2013.06.26-a/1 page 6 of 6 design considerations 1) requirement of output load to ensure this module operate efficiently and reliably, during operation, the minimum output load could not be less than 5% of the full load, otherwise ripple maybe increase dramatically. to ensure this module operate normally, the load must be more than 5% of the full load. 2) recommended circuit all the wrf_mt-3w series have been tested according to the following recommended test circuit (see figure 6). if you want to further decrease the input/output ripple, increase a capacitance-values properly or choose capacitors with low esr. however, the capacitance of the output filter capacitor must be proper. if the capacitance is too big, a startup problem might arise. p rovided the safe and reliable operation is ensured, the greatest capacitance of its filter capacitor must be less than the max. capacitive load. recommended circuit refer to"emc recommended circuit". ldm2 c1 vin gnd +vo 0v eut c2 ctrl cd d1 r vc vin gnd cout +vo 0v (figure 6) 3)ctrl terminal when open or high impedance, the converter works well.when this pin is high ,the converter shut down. it should be note that the input current should be between 5-10ma,exceeding the maximum 20ma will cause permanent damage to the converter. the value of r can be derived as follows: 300 - 0 . 1 - - c d c i v v r = for detailed parameter, please refer to "emc recommended circuit". 4)input current when it is used in unregulated power supply, be sure that the fluctuating range of the po wer supply and the rippled voltage do not exceed the module standard. input current of power supply should afford the flash startup current of this kind of dc/dc module (figure 7). general: vin=12v ip =675ma vin=24v ip =320ma vin=48v ip =160ma i n p u t c u r r e n t ( a ) input voltage (v) input voltage range ip (figure 7) 5) it is not recommended to increase the output power capability by connecting two or more converters in parallel. the product is not hot-swappable note: 1. min. load shouldn't be less than 5%, otherwise ripple maybe increased dramatically. if the product operates under min. load, it may not be guaranteed to meet all specifications listed. operation with minimum load will not damage the converter. 2. recommended dual output models unbalanced load is ? 5%, if the product operates > 5%, it may not be guaranteed to meet all specifications listed. please contact our technical support for more details. 3. max. capacitive load is tested at nominal input voltage and full load. 4. all specifications measured at ta=25 c, humidity<75%, nominal input voltage and rated output load unless otherwise specified. 5. in this datasheet, all test methods are based on our corporate standards. 6. all characteristics are for listed models, and non-standard models may perform differently. please contact our technical support for more details. 7. please contact our technical support for any specific requirement. 8. specifications of this product are subject to changes without prior notice. mornsun science & technology co.,ltd. address: no. 5, kehui st. 1, kehui development center, science ave., guangzhou science city, luogang district, guangzhou,p.r.china. tel: 86-20-38601850 fax:86-20-38601272 e-mail: info@mornsun.cn http://www.mornsun-power.com
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