WRA-YLS-3W WRA-YLS-3W WRA-YLS-3W WRA-YLS-3W WRA-YLS-3W WRA-YLS-3W WRA-YLS-3W WRA-YLS-3W series series http://www.microdc.cn technical enquiries-email:tech@microdc.cn tel:0086-20-86000646 page 1 of 4 selection selection selection selection selection selection selection selection guide guide guide guide guide guide guide guide order code input voltage rated output voltage output current input current 2 effciency (min.) isolation capacitance min load 3 full load v (nom.) v ma ma ma % pf wra2412yls-3w 24 12 32 125 157 81 36 wra2415yls-3w 24 15 25 100 155 82 36 wra4812yls-3w 48 12 32 125 78 78 40 wra4815yls-3w 48 15 25 100 78 78 40 model model model model model model model model selection selection selection selection selection selection selection selection wr wr wr wr wr wr wr wr a a a a a a a a 24 24 24 24 24 24 24 24 12 12 12 12 12 12 12 12 y y y y y y y y l l l l s s s s s s s s - - - - - - - - 3 3 3 3 3 3 3 3 w w w w w w w w product series input voltage output voltage wide ( 2 :1) input range lengthened sip package style rated power wide wide wide wide input,isolated input,isolated input,isolated input,isolated & & & & regulated regulated regulated regulated dual dual dual dual output output output output sip sip sip sip dc/dc dc/dc dc/dc dc/dc converter converter converter converter features features features features features features features features rohs compliant compact sip form factor 2:1 wide range voltage input continuous short circuit protection with current foldback operating operating operating operating temperature temperature temperature temperature range range range range C C C C 40 40 40 40 c c c c to to to to +85 +85 +85 +85 c c c c 0.5% load regulation 1kvdc isolation 24v & 48v nominal input 12v & 15v output power density 1.00w/cm 3 remote on/off no electrolytic capacitors low noise product product product product product product product product overview overview overview overview overview overview overview overview the WRA-YLS-3W series is a range of high performance miniature dc/dc converters having regulated outputs over the wide temperature range of C 40 c to +85 c. the input voltage range is 2:1 and the input to output isolation is 1kvdc. continuous short circuit protection, external control and extremely small sip packaging provide state of the art functionality. the use of ceramic capacitors and a ceramic substrate, and smd construction, provide genuine high reliability. nominal input voltages of 24 and 48v with output voltages of 12 and 15v are available as standard with custom parts on request. the plastic case is rated to ul 94v-0 with encapsulant to ul 94v-1. microdc reserves the copyright input input input input input input input input characteristics characteristics characteristics characteristics characteristics characteristics characteristics characteristics parameter parameter parameter parameter conditions conditions conditions conditions min. min. min. min. typ. typ. typ. typ. max. max. max. max. units units units units voltage range all wra24xx types 18 24 36 v all wra 48 xx types 36 48 72 refected ripple current all wra 24 types when 10 f at input 200 250 ma p-p all wra 48 types when 10 f at input 105 150 shutdown power vin nominal 24xx 8 mw vin nominal 48xx 16 input input input input input input input input characteristics characteristics characteristics characteristics characteristics characteristics characteristics characteristics parameter parameter parameter parameter conditions conditions conditions conditions min. min. min. min. typ. typ. typ. typ. max. max. max. max. units units units units voltage set point accuracy with external input/output capacitors 1 5 % line regulation low line to high line with external input/ output capacitors 0.05 0.2 % load regulation minimum load to rated load with external input/output capacitors 0.2 0.5 % ripple bw = 20hz to 300khz with external input/ output capacitors 15 30 mv rms ripple & noise bw = dc to 20mhz with external input/ output capacitors 90 150 mv p-p cross regulation % voltage change on negative output when positive load varies from 12% to 50% with negative load fxed at 50% 2.1 5.0 % absolute absolute absolute absolute absolute absolute absolute absolute maximum maximum maximum maximum maximum maximum maximum maximum ratings ratings ratings ratings ratings ratings ratings ratings short-circuit protection continuous lead temperature 1.5mm from case for 10 seconds 300 c minimum output load for specifcation 3 25% of rated output control pin input current 15ma input voltage 24 types 1 40v input voltage 48 types 1 80v free air space 10mm min. around component 1. absolute maximum value for 30 seconds. prolonged operation may damage the product. 2. measured at full load with external input/output capacitors. refer to application note. 3. a lower load condition can be used but higher levels of output ripple may be experienced, this condition may also cause the output voltage to exceed its specifcation transiently during power down when the input voltage also falls below its rated minimum. all specifcations typical at ta=25 c, nominal input voltage and rated output current unless otherwise specifed.
WRA-YLS-3W WRA-YLS-3W WRA-YLS-3W WRA-YLS-3W WRA-YLS-3W WRA-YLS-3W WRA-YLS-3W WRA-YLS-3W series series http://www.microdc.cn technical enquiries-email:tech@microdc.cn tel:0086-20-86000646 page 2 of 4 temperature temperature temperature temperature temperature temperature temperature temperature characteristics characteristics characteristics characteristics characteristics characteristics characteristics characteristics parameter parameter parameter parameter conditions conditions conditions conditions min. min. min. min. typ. typ. typ. typ. max. max. max. max. units specifcation -40 85 c operation -40 100 storage -50 130 case temperature rise above ambient 12v & 15v output types @ 100% load 36 mttf mttf mttf mttf mttf mttf mttf mttf (mean (mean (mean (mean (mean (mean (mean (mean time time time time time time time time to to to to to to to to failure) failure) failure) failure) failure) failure) failure) failure) part part part part number number number number mttf mttf mttf mttf units units units units conditions wra2412yls-3w 2077 khrs calculated using mil-hdbk 217f with nominal input at full voltage (ground benign) at 25 c. wra2415yls-3w 2080 wra4812yls-3w 2090 wra4815yls-3w 2045 general general general general general general general general characteristics characteristics characteristics characteristics characteristics characteristics characteristics characteristics parameter parameter parameter parameter conditions conditions conditions conditions min. min. min. min. typ. typ. typ. typ. max. max. max. max. units control pin (ctrl) input current please refer to control pin application note 6 15 ma switching frequency load causing lowest frequencies, 100% load vin min. 100 125 150 khz load causing highest frequencies, 25% load vin max. 300 400 500 isolation isolation isolation isolation isolation isolation isolation isolation characteristics characteristics characteristics characteristics characteristics characteristics characteristics characteristics parameter parameter parameter parameter conditions conditions conditions conditions min. min. min. min. typ. typ. typ. typ. max. max. max. max. units isolation test voltage flash tested for 1 second 1000 vdc resistance viso = 1000vdc 1 g ? technical technical technical technical technical technical technical technical notes notes notes notes notes notes notes notes isolation isolation isolation isolation voltage voltage voltage 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 specif i ed time, across a component designed to provide electrical isolation, to verify the integrity of that isolation. microdc WRA-YLS-3W 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 specif i c agency approvals, such as the WRA-YLS-3W 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 repeated repeated repeated high-voltage high-voltage high-voltage high-voltage isolation isolation isolation isolation testing testing testing 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 WRA-YLS-3W series has an ei ferrite core, 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 specif i 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.
WRA-YLS-3W WRA-YLS-3W WRA-YLS-3W WRA-YLS-3W WRA-YLS-3W WRA-YLS-3W WRA-YLS-3W WRA-YLS-3W series series http://www.microdc.cn technical enquiries-email:tech@microdc.cn tel:0086-20-86000646 page 3 of 4 application application application application application application application application notes notes notes notes notes notes notes notes external external external external capacitance capacitance capacitance capacitance although these converters will work without external capacitors, they are neces- sary in order to guarantee the full parametric performance over the full line and load range. all parts have been tested and characterized using the following values and test circuit. value value value value cin cout 10 f, 200v 47 f, 25v value value value value control control control control pin pin pin pin the WRA-YLS-3W converters have a shutdown feature which enables the user to put the converter into a low power state. the control pin connects directly to the base of an internal transistor. if the pin is left open (high impedance), the converter will be on (there is no allowed low state for this pin), but once a control voltage is applied with suff i cient drive current, the converter will be switched off. a suitable application circuit is shown below. d 1 (eg 1n4001) is required to provide high impedence when the signal is low. from the WRA-YLS-3W specifcation, the drive current to operate this function is recommended to be 6ma, and hence the value of r1 can be derived as follows: cross cross cross cross regulation regulation regulation regulation load regulation is at its best when the positive and negative loads are balanced. when the loads are asymmetric, the negative output is not as tightly regulated as the positive output. to meet ripple specifcation a total minimum load of 25% full load is required, however, the WRA-YLS-3W can be used with much lighter loading at the expense of increased ripple. a small load is required on the negative output of 150mw to ensure the maximum negative output voltage is not exceeded. cross regulation is def i ned as change in the negative output voltage as a percentage of nominal as the positive output load is changed from 12.5% to 50% with the negative load is f i xed at 50% of full load.
WRA-YLS-3W WRA-YLS-3W WRA-YLS-3W WRA-YLS-3W WRA-YLS-3W WRA-YLS-3W WRA-YLS-3W WRA-YLS-3W series series http://www.microdc.cn technical enquiries-email:tech@microdc.cn tel:0086-20-86000646 page 4 of 4 microdc professional power module,inc. tel:0086-20-86000646 e-mail:tech@microdc.cn website:http://www.microdc.cn rohs rohs rohs rohs compliant compliant compliant compliant information information information 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 reach reach reach compliant compliant compliant compliant information information information 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. package package package package package package package package specifications specifications specifications specifications specifications specifications specifications specifications mechanical mechanical mechanical mechanical dimensions dimensions dimensions dimensions mechanical mechanical mechanical mechanical dimensions dimensions dimensions dimensions pin pin pin pin connections connections connections connections pin function 1 -vin 2 +vin 3 ctrl 6 +vout 7 0v 8 n/a 9 -vout package weight: 6.5g n/a - not available for electrical connection all pins on a 0.1(2.54) pitch and within 0.01(0.25) of true position. unless otherwise stated all dimensions in inches(mm) 0.01(0.25).
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