the copyright and authority for the interpretation of the products are reserved by mornsun wrb_lt-3wr2 2013.03.12-a/1 page 1 of 6 wrb_lt-3wr2 series 3w, wide input, isolated & regulated single output dc/dc converter patent protected rohs part number system rated power package style output voltage input voltage product series features ultra-small size, smd packag 2:1 wide input voltage range operating temperature range: -40 c ~ +85 c 1.5kvdc isolation short circuit protection (automatic recovery) high power density meet ul94-v0 application the wrb_lt-3wr2 s eries 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. 1) these products apply to where: input voltage range 2:1; 2) 1.5kv 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 wrb1205lt-3wr2 5 600 30 333 3300 75 wrb1212lt-3wr2 12 250 12 325 1800 77 wrb1215lt-3wr2 12 (9-18) 22 15 200 10 316 22 1000 79 wrb2405lt-3wr2 5 600 30 164 3300 76 WRB2412LT-3WR2 12 250 12 154 1800 81 wrb2415lt-3wr2 24 (18-36) 40 15 200 10 156 12 1000 80 wrb4805lt-3wr2 5 600 30 81 3300 77 wrb4812lt-3wr2 12 250 12 78 1800 80 wrb4815lt-3wr2 48 (36-75) 80 15 200 10 78 8 30 1000 80 note: . absolute maximum rating without damage on the converter, but it isn't recommended. intput 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 8 9 24vdc input 11 16 18 start-up voltage 48vdc input 24 33 36 vdc input filter pi filter output specifications item test conditions min. typ. max. unit output voltage accuracy 5% to 100% load -- 1 3 vo 5v -- 1.5 5 no-load output voltage accuracy vo 5v -- 1.5 3 line regulation full load, input voltage from low to high -- 0.2 0.4 load regulation 5% to 100% load -- 0.2 0.75 %
the copyright and authority for the interpretation of the products are reserved by mornsun wrb_lt-3wr2 2013.03.12-a/1 page 2 of 6 transient recovery time -- 0.5 1 ms transient response deviation 25% load step change -- 2 5 % temperature coefficient 100% load -- 0.02 0.03 %/ c ripple* -- 20 35 noise* 20mhz bandwidth -- 45 60 mvp-p output short circuit protection 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 tested for 1 minute , leakage current less than 1 ma 1500 -- -- vdc isolation resistance test at 500vdc 1000 -- -- m isolation capacitance input/output,100khz/0.1v -- 1 -- nf switching frequency(pfm mode) 100% load, nominal input voltage -- 350 -- khz mtbf mil-hdbk-217f@25 1000 -- -- k hours case material epoxy resin ul94-v0 weight -- 5.2 -- g environmental specifications item test conditions min. typ. max. unit storage humidity non condensing -- -- 95 % operating temperature power derating (above 85 ,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 emi ce cispr22/en55022 class b external circuit refer to figure1- or figure 3 re cispr22/en55022 class b external circuit refer to figure1- or figure 3 esd iec/en61000-4-2 contact 4kv perf. criteria b rs iec/en61000-4-3 10v/m perf. criteria a iec/en61000-4-4 2kv perf. criteria b external circuit refer to figure1- ? eft iec/en61000-4-4 4kv perf. criteria b external circuit refer to figure 3 surge iec/en61000-4-5 2kv perf. criteria b external circuit refer to figure1- or figure 3 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 emc recommended circuit ldm2 c0 tvs ldm1 mov fuse c1 vin + vin gnd +vo 0v eut load c2 gnd (figure1)
the copyright and authority for the interpretation of the products are reserved by mornsun wrb_lt-3wr2 2013.03.12-a/1 page 3 of 6 recommended external circuit parameters model vin:12v vin:24v vin:48v fuse choose according to practical input current mov -- 10d560 10d101 ldm1 -- 56 h tvs smcj28a smcj48a smcj90a c0 680 f/25v 120 f/50v 120 f/100v ldm2 12 h c1 4.7uf/50v 4.7uf/100v c2 4.7uf/50v 4.7uf/100v note: 1. in figure 1,part is ems recommended external circuit, part is emi recommended external circuit. choose according to requirements; 2. if there is no recommended parameters, the model no require the external component. emc recommended circuit pcb layout (figure 2) emc module application circuit eut gnd -vo +vo -vin +vin ft-a/bx1d load 0v +vo vin c + -vin +vin fuse nominal input voltage<48v, c 330uf/50v nominal input voltage=48v, c 330uf/100v ft-a/bx1d is mornsun s eft suppresser (figure 3) emc module recommended circuit pcb layout (figure 4) emi test waveform (nominal and full load) wrb2405lt-3wr2 with external circuit power+ (class b) wrb2405lt-3wr2 with external circuit power- (class b)
the copyright and authority for the interpretation of the products are reserved by mornsun wrb_lt-3wr2 2013.03.12-a/1 page 4 of 6 wrb4815lt-3wr2 with external circuit power+ (class b) wrb4815lt-3wr2 with external circuit power- (class b) 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 ( c ) 60 max (>220 c) sec 220 c 10 max sec peak.temp 240 c remark: the curve applies only to the hot air reflow soldering efficiency vs input voltage curve (full load) 50 55 60 65 70 75 80 85 90 95 100 18 21 24 27 30 33 36 input voltage(v) efficiency(%) wrb2405lt-3wr2 efficiency vs output load curve (vin=vin-nominal) 0 10 20 30 40 50 60 70 80 90 100 10 20 30 40 50 60 70 80 90100 total output current (%) efficiency(%) wrb2405lt-3wr2 efficiency vs input voltage curve (full load) 50 55 60 65 70 75 80 85 90 95 100 364044485256606468727680 input voltage(v) efficiency(%) wrb4815lt-3wr2 efficiency vs output load curve (vin=vin-nominal) 0 10 20 30 40 50 60 70 80 90 100 10 20 30 40 50 60 70 80 90100 total output current (%) efficiency(%) wrb4815lt-3wr2
the copyright and authority for the interpretation of the products are reserved by mornsun wrb_lt-3wr2 2013.03.12-a/1 page 5 of 6 outline dimensions,recommended footprint & package diagram 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 wrb_lt-3wr2 2013.03.12-a/1 page 6 of 6 design considerations 1) requirement on output load to ensure this module can operate efficiently and reliably, during operation, the minimum output load could not be less than 5% of the full load, o therwise ripple maybe increase dramatically. if the actual output power is very small, please connect a resistor with proper resistance at the output end in parallel to increase the load, suppose to use the resistance of 5% rated power,or use our company s products with a lower rated output power. 2) recommended circuit all the wrb_lt-3wr2 series have been tested according to the following recommended test circuit before leaving the factory(see figure 6). if you want to further decrease the input/output ripple, you can 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. general: cin: 12v 100 f 24v&48v 10 f~47 f cout: 10 f/100ma dc dc vin gnd +vo 0v cin cout (figure 6) 3 ) input current when it is used in unregulated power supply, be sure that the fluctuating range of the power 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 =640ma 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) 4 ) 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 under minimum load will not damage the converter. 2. max. capacitive load is tested at input voltage range and full load. 3. all specifications measured at ta=25 c, humidity<75%, nominal input voltage and rated output load unless otherwise specified. 4. in this datasheet, all test methods are based on our corporate standards. 5. all characteristics are for listed models,and non-standard models may perform differently.please contact our technical support for more details. 6. please contact our technical support for any specific requirement. 7. 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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