a a -xt -xt series series http://www.microdc.cn technical enquiries-email:tech@microdc.cn tel:0086-20-86000646 page 1 of 6 1. calculated using mil-hdbk-217f with nominal input voltage at full load. all specifications typical at ta=25 , nominal input voltage and rated output current unless otherwise specified. model model selection selection a a 05 05 05 05 x x t t product series input voltage output voltage fixed input smd package microdc r eserves the copyright 1 w, fixed input, isolated dual output smd dc - dc converter features features footprint over pins 1.64cm 2 short circuit protection(automatic recovery) i/o isolation voltage 1 000vdc operating temperature: -40 85 high efficiency up to 78% toroidal magnetics small smd package with footprint power density 1.36w/cm 3 lead frame technology multi-layer ceramic capacitors custom solutions available applications applications selection selection guide guide order code input output efficiency isolation capacitance mttf 1 voltage(vdc) current (ma) voltage (vdc) current (ma) (%.typ.) nominal rated load pf khrs a 0 3 03 xt 3.3 402 3.3 1 52 81 29 1005 a 0 3 0 5xt 3.3 388 5 100 83 30 399 a 0 309 xt 3.3 405 9 55 74 34 827 a 0 312 xt 3.3 390 12 42 76 40 375 a 0 315 xt 3.3 392 15 33 81 42 206 a 05 03 xt 5 259 3.3 15 2 85 31 964 a 05 0 5xt 5 290 5 100 83 33 1697 a 05 0 5 n xt 5 251 5 100 86 42 367 a 05 09 xt 5 267 9 55 85 38 682 a 05 12 xt 5 260 12 42 74 44 343 a 05 1 5xt 5 256 15 33 78 43 188 a 12 0 5xt 12 121 5 100 80 50 559 a 12 09 xt 12 113 9 55 80 72 375 a 121 2 xt 12 111 12 42 85 89 243 a1215 xt 12 110 15 33 81 100 154 the a -xt series are miniature,1w dc/dc converters with high isolation in a smd package. with a new package design these converters are qualif i ed for the higher temperatures requested by lead-free ref l ow solder processes. with the small footprint, these converters are the ideal solution for board level power distribution,mainly for applications in the industrial and telecom field. for automated smd production lines the devices can be supplied in standard tape and reel package. input input characteristics characteristics parameter conditions min. typ. max. units voltage range continuous operation, 3v input 2.97 3.3 3.63 vdc continuous operation, 5v input 4.5 5 5.5 vdc continuous operation, 12v input 10.8 12 13.2 vdc start up time 41 50 ma p-p i i solation solation characteristics characteristics parameter conditions min. typ. max. units isolation voltag e flash tested for 1 secon d 1000 vdc resistanc e viso= 1000vd c 10 g ? general general characteristics characteristics parameter conditions min. typ. max. units switching frequency 0312, 0315 100 khz 0303, 0305, 0503, 0505 110 khz all other variant s 115 khz absolute absolute maximum maximum ratings ratings parameter conditions lead temperature 1.5mm from case for 10 second s 300 internal power dissipation 700mw input voltage v , a03 types 5.5v input voltage v in , a05 types 7v input voltage v in , a12 types 15v
a a -xt -xt series series http://www.microdc.cn technical enquiries-email:tech@microdc.cn tel:0086-20-86000646 page 2 of 6 output output specifications specifications parameter conditions min. typ. max. units rated power ta=-40 c to 85 c 0.1 1.0 w voltage set point see tolerance envelope line regulation high vin to low vin 1.0 1.2 %% load regulation 1 10% load to rated load, 0303& 0503 10 15 % 10% load to rated load, 5v output type s 10 12 % 10% load to rated load, 0309 9.0 10 % 10% load to rated load, 0509 & 1209 6.5 8.0 % 10% load to rated load, 0312 & 0315 11 14 % 10% load to rated load, 0512 & 1212 6.0 8.5 % 10% load to rated load, 0515 & 1215 6.0 7.0 % ripple noise bw=dc to 20mhz, 3.3v output types, a0305 & a0505 40 80 mv p-p bw=dc to 20mhz, all other 5v output type s 50 100 mv p-p bw=dc to 20mhz, 9v output type s 35 80 mv p-p bw=dc to 20mhz, 12v output type s 50 110 mv p-p bw=dc to 20mhz, 15v output type s 65 110 mv p-p note:1 12v input types have typically 3% less load regulation change. temperature temperature characteristics characteristics parameter conditions min. typ. max. units specification all output type s -40 85 storage -55 125 case temperature rise above ambient 0305, 0505, 0312, 0315 19 0303, 0309, 0503 25 0505, 1205 46 all other variants 35 cooling free air convection technical technical notes 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 spec ifie d time, across a component designed to provide electrical isolation, to verify the integrity of that isolation. professional power module a -xt series of dc/dc converters are all 100% production tested at their stated isolation voltage. this is 1kvdc 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 spe cifi c agency approvals, such as the a -xt series, both input and output should normally be maintained 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 barrier; 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 circuits 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 a -xt 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 insulation. 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 be reduced by 20% from spec ifi 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. temperature temperature derating derating graph graph
a a -xt -xt series series http://www.microdc.cn technical enquiries-email:tech@microdc.cn tel:0086-20-86000646 page 3 of 6 http://www.microdc.cn technical enquiries-email:tech@microdc.cn tel:0086-20-86000646 page 1/3 application application notes notes minimum load the minimum load to meet datasheet specification is 10% of the full rated load across the specified input voltage range. lower than 10% minimum loading will result in an increase in output voltage, which may rise to typically double the specified 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 2.2 s and output capacitance of 10 f, are shown in the table below. the product series will start into a capacitance of 47 f with an increased start time, however, the maximum recommended output capacitance is 10 f. start-up time start-up time s s a0303xt 1630 a0509xt 6850 a0305xt 1359 a0512xt 11560 a0309xt 3435 a0515xt 15640 a0312xt 6590 a1205xt 1154 a0315xt 25340 a1209xt 4050 A0503XT 1599 a1212xt 7995 a0505xt 2185 a1215xt 11200 a0305nxt 1395 ripple & noise characterisation method ripple and noise measurements are performed with the following test con ? guration. c1 1 f x7r multilayer ceramic capacitor, voltage rating to be a minimum of 3 times the output voltage of the dc/dc converter c2 10 f tantalum capacitor, voltage rating to be a minimum of 1.5 times the output voltage of the dc/dc converter with an esr of less 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 specified values. differential mode noise test schematic
a a -xt -xt series series http://www.microdc.cn technical enquiries-email:tech@microdc.cn tel:0086-20-86000646 page 4 of 6 application application notes notes 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 recommended. 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 current, 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 resonant frequency) should be >20mhz. inductor capacitor l, h smd through hole c, f a0303xt 10 82103c 11r103c 4.7 a0305xt 22 82223c 11r223c 2.2 a0309xt 22 82223c 11r223c 2.2 a0312xt 47 82473c 11r473c 1 a0315xt 220 82474c 11r474c 0.22 A0503XT 10 82103c 11r103c 4.7 a0505xt 10 82103c 11r103c 4.7 a0305nxt 10 82103c 11r103c 4.7 a0509xt 22 82223c 11r103c 2.2 a0512xt 47 82473c 11r223c 1 a0515xt 220 82474c 11r473c 0.22 a1205xt 10 82103c 11r474c 4.7 a1209xt 22 82223c 11r223c 2.2 a1212xt 47 82473c 11r473c 1 a1215xt 220 82474c 11r474c 0.22 tolerance tolerance envelopes envelopes 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.
a a -xt -xt series series http://www.microdc.cn technical enquiries-email:tech@microdc.cn tel:0086-20-86000646 page 5 of 6 outline outline dimensions dimensions footprint footprint details details solder solder pad pad dimension dimension dimensions in [mm], () = inch pin pitch tolerances: 0.13 ( 0.005) other tolerances: 0.25 ( 0.01) footprint footprint details details pin dual 1 -vin 3 +vin 5 n a 7 0v 9 -vout 10 n a 12 +vout 14 n a 16 n a 18 n a na - not available for electrical connection. tube tube outline outline dimensions dimensions unless otherwise stated all dimensions in mm 0.5 (inches 0.02). tube length : 475 2.0 (18.70 0.07). tube quantity :25 mechanical mechanical dimensions dimensions note: unit:mm[inch] pin section toleranc e s: 0.10mm[ 0.004inch] general tolerances: 0.25mm[ 0.010inch] weight: 1.53g specif i cations can be changed any time without notice. no parallel connection or plug and play. note: 1. the load shouldn't be less than 10%, otherwise ripple will increase dramatically. 2. operation under 10% load will not damage the converter; however, they may not meet all specification listed. 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 the test methods of indications are based on corporate standards. 5. only typical models listed, other models may be different, please contact our technical person for more details.
a a -xt -xt series series http://www.microdc.cn technical enquiries-email:tech@microdc.cn tel:0086-20-86000646 page 6 of 6 microdc professional power module,inc. tel:0086-20-86000646 e-mail:tech@microdc.cn website:http://www.microdc.cn microdc professional power module,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. specifications are subject to change without notice. ? 2010 microdc professional power module, inc. guangzhou rohs compliant information this series is compatible with rohs soldering systems with a peak wave solder temperature of 300 c for 10 seconds. the pin termination finish on the sip package type is tin plate, hot dipped over matte tin with nickel preplate. the dip types are matte tin over nickel preplate. both types in this series are backward compatible with sn/pb soldering systems. reach compliant information this series has proven that this product does not contain harmful chemicals, it also has harmful chemical substances through the registration, inspection and approval. tape tape & & reel reel specifications specifications reel packaging details product orientation pin 1, located nearest to carrier drive sprocket. reel quantity : 500 reel outline dimensions tape outline dimensions
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