wra-yqd-20& wra-yqd-20& wra-yqd-20& wra-yqd-20& wra-yqd-20& wra-yqd-20& wra-yqd-20& wra-yqd-20& wrb-yqd- wrb-yqd- wrb-yqd- wrb-yqd- wrb-yqd- wrb-yqd- wrb-yqd- wrb-yqd- 2 2 2 2 2 2 2 2 0w 0w 0w 0w 0w 0w 0w 0w series series http://www.microdc.cn technical enquiries-email:tech@microdc.cn tel:0086-20-86000646 page 1 of 3 microdc reserves the copyright 2 2 2 2 0 0 0 0 w, w, w, w, wide wide wide wide input, input, input, input, isolated isolated isolated isolated & & & & regulated regulated regulated regulated dual/ dual/ dual/ dual/ single single single single output output output output dc-dc dc-dc dc-dc dc-dc converter converter converter converter features features features features features features features features wide 2:1 dc input range in/out capacitance1000pf protections : short circuit / overload / over voltage 1 5 00vdc i/o isolation for d/d cooling by free air convection built-in remote on-off control 100% full load burn-in test fixed switching frequency at 225khz lost cost mtbf>1000khours high reliability 3 year warranty applications applications applications applications applications applications applications applications model model model model model model model model selection selection selection selection selection selection selection selection wrb wrb wrb wrb wrb wrb wrb wrb 24 24 24 24 24 24 24 24 12 12 12 12 12 12 12 12 y y y y y y y y q q q q q q q q d d d d d d d d - - - - - - - - 2 2 2 2 2 2 2 2 0w 0w 0w 0w 0w 0w 0w 0w ( ( ( ( ( ( ( ( 1667 1667 1667 1667 1667 1667 1667 1667 ) ) ) ) ) ) ) ) product series input voltage output voltage wide ( 2 :1) input range 2" 2" dip package style rated power (output current) the wr a(b) - yq d- 20 w series of dc/dc converters has been designed for a wide range of applications including communications, industrial systems and battery powered mobile equipments. key features are high power density and 2:1 wide input ranges of 18~ 36 vdc and 36~ 7 2 vdc. (but also can do high power density and 4:1 ultrawide input ranges of 9~ 36 vdc and 18~ 7 2 vdc. ) selection selection selection selection selection selection selection selection guide guide guide guide guide guide guide guide order code input voltage range (vdc) output voltage (vdc) output current max. (ma) efficiency typ. (%) wra1205yqd-20w 9~18 5 2 000 78 wra1212yqd-20w 9~18 12 833 82 wra1215yqd-20w 9~18 1 5 667 80 wra1224yqd-20w 9~18 24 417 83 wra2405yqd-20w 18 ~ 36 5 2 000 79 wra2412yqd-20w 18 ~ 36 12 833 82 wra2415yqd-20w 18 ~ 36 1 5 667 83 wra2424yqd-20w 18 ~ 36 24 417 78 wra4805yqd-20w 36 ~ 72 5 2 000 80 wra4812yqd-20w 36 ~ 72 12 833 84 wra4815yqd-20w 36 ~ 72 1 5 667 85 wra4824yqd-20w 36 ~ 72 24 417 78 wrb1205yqd-20w 9~18 5 4000 79 wrb1212yqd-20w 9~18 12 1667 80 wrb1215yqd-20w 9~18 1 5 1333 80 wrb1224yqd-20w 9~18 24 833 78 wrb2405yqd-20w 18 ~ 36 5 4000 82 wrb2412yqd-20w 18 ~ 36 12 1667 82 wrb2415yqd-20w 18 ~ 36 1 5 1333 83 wrb2424yqd-20w 18 ~ 36 24 833 78 wrb4805yqd-20w 36 ~ 72 5 4000 80 wrb4812yqd-20w 36 ~ 72 12 1667 84 wrb4815yqd-20w 36 ~ 72 1 5 1333 85 WRB4824YQD-20W 36 ~ 72 24 833 79 specification specification specification specification specification specification specification specification output r ipple&noise (max.) ( note.2 ) 100mvp-p l ine regulation ( note.3 ) 0.5% l oad regulation ( note.4 ) 0.5% protection overload above 105% rated output power protection type : over power limiting, recovers automatically after fault condition is removed o ver voltage xx 03 :3.8~4.95v xx05 :5.75 ~ 7.5v xx12:13.8 ~ 18v xx15:17.25 ~ 22.5v protection type : shut off o/p voltage, clamping by zener diode s hort c ircuit protection type : constant current limiting, recovers automatically after fault condition is removed function on/off c ontrol logic "1" or open: power on logic "0" short to vin-: power off environment w orking temp. -25~+85 (refer to output load derating curve) s torage t emp.,humidity -25~+85 , 0~95% rh t emp. coefficient 0.03%/ 0~50 safety &emc (note 5 ) s afety standards design refer to lvd i solation voltage i/p-o/p:1.5kvdc i solation resistance i/p-o/p:100m ohms/500vdc others mtbf 322.4k hrs min. mil-hdbk-217f (25 ) d imension 50.8 50.8 16mm (2" 2" 0.63") (l w h) p acking 110 g ; 150pcs/15.8kg/0.97cuft note 1. all parameters are specified at normal input, rated load, 2570% rh ambient. 2. ripple & noise are measured at 20mhz of bandwidth by using a 12" twisted p air-wire terminated with a 0.1uf & 47uf parallel capacitor. 3.line regulation is measured from low line to high line at rated load. 4.load regulation is measured from 10% to 100%rated load 5 . please prevent the converter from operating in overload or short circuit condition for more than 30 seconds.
wra-yqd-20& wra-yqd-20& wra-yqd-20& wra-yqd-20& wra-yqd-20& wra-yqd-20& wra-yqd-20& wra-yqd-20& wrb-yqd- wrb-yqd- wrb-yqd- wrb-yqd- wrb-yqd- wrb-yqd- wrb-yqd- wrb-yqd- 2 2 2 2 2 2 2 2 0w 0w 0w 0w 0w 0w 0w 0w series series http://www.microdc.cn technical enquiries-email:tech@microdc.cn tel:0086-20-86000646 page 2 of 3 single single single single output(wrb-yqd-20w) output(wrb-yqd-20w) output(wrb-yqd-20w) output(wrb-yqd-20w) pin assignment pin assignment 1 +vin 6 +v out 2 -vin 7 -v out 3,5 no pin 8 trim 4 c trl ( on/off ) application application application application application application application application note note note note note note note note requirement requirement requirement requirement on on on on output output output output load load load load in order to ensure the product operate efficiently and reliably,in addition to a max load(namely full load), a minimum load is specified for this kind of dc/dc converter.make sure the specified range of input voltage is not exceeded,the minimum output load no less than 10% load.if the actual load is less than the specified minimum load, the output ripple may increase sharply while its efficiency and reliability will reduce greatly.if the actual output power is very small,please add an appropriate resistor as extra loading,or contact our company for other lower output power products. recommended recommended recommended recommended circuit circuit circuit circuit all the wr -yq d- 20 w series have been tested a ccording to the following recommended testing circuit before leaving factory.this series should be tested under load(see figure 1). if you want to further decrease the input/output ripple,you can increase capacitance 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.for every channel of output,provided the safe and reliable operation is ensured,the greatest capacitance of its filter capacitor sees (table 1).general: cin: 10 f-47 f c out : 10 f/100ma ctrl ctrl ctrl ctrl terminal terminal terminal terminal when open or high impedance,the converter work well; when this pin is high ; the converter shutdown; it should be note that the input current (ic) should between 5-10ma, exceeding the maximum 20ma will cause permanence damage to the converter. the value of r can be derived as follows : input input input input current current current current while using unstable power source,please ensure the output voltage and ripple voltage do not exceed indexes of the converter.the preceding power source must be able to provide for converter sufficient starting current ip. general:ip 1. 6 *iin-max no no no no parallel parallel parallel parallel connection connection connection connection or or or or plug plug plug plug and and and and play play play play mechanical mechanical mechanical mechanical mechanical mechanical mechanical mechanical specification specification specification specification specification specification specification specification unit:mm pin section tolerances: 0.10mm general tolerances: 0.25mm typical typical typical typical typical typical typical typical characteristics characteristics characteristics characteristics characteristics characteristics characteristics characteristics temperature derating graph ambient temperature ( ) external external external external external external external external output output output output output output output output trimming trimming trimming trimming trimming trimming trimming trimming outputmayoptionallybe e xternallytrimmed(10%) a fixed resister oran externaltrimpotas shown on/off on/off on/off on/off on/off on/off on/off on/off control control control control control control control control pin pin pin pin pin pin pin pin control input.....................................pin4 control common................................pin2 logic compatibility......cmos or open collector ttl control control control control voltage voltage voltage voltage on....... .............................. .....+5.5vdc min or open circuit off.... ................................ ..+2.5vdc max. or short to pin2 dual dual dual dual output(wra-yqd-20w) output(wra-yqd-20w) output(wra-yqd-20w) output(wra-yqd-20w) pin assignment pin assignment 1 +vin 5 +v out 2 -vin 6 common 3 no pin 7 -v out 4 c trl ( on/off ) 8 trim
wra-yqd-20& wra-yqd-20& wra-yqd-20& wra-yqd-20& wra-yqd-20& wra-yqd-20& wra-yqd-20& wra-yqd-20& wrb-yqd- wrb-yqd- wrb-yqd- wrb-yqd- wrb-yqd- wrb-yqd- wrb-yqd- wrb-yqd- 2 2 2 2 2 2 2 2 0w 0w 0w 0w 0w 0w 0w 0w series series http://www.microdc.cn technical enquiries-email:tech@microdc.cn tel:0086-20-86000646 page 3 of 3 outline outline outline outline outline outline outline outline dimensions dimensions dimensions dimensions dimensions dimensions dimensions dimensions footprint footprint footprint footprint footprint footprint footprint footprint details details details details details details details details fosc:225khz recommended recommended recommended recommended recommended recommended recommended recommended footprint footprint footprint footprint footprint footprint footprint footprint grid:2.54 2.54mm(0.1 0.1inch) diameter:1.00mm(0.039inch) tube tube tube tube tube tube tube tube outline outline outline outline outline outline outline outline dimensions dimensions dimensions dimensions dimensions dimensions dimensions dimensions unit :mm[inch] general tolerances: 0.50mm[ 0.020inch] l= 230 mm[ 9.055 inch] tube quantity: 7 pcs 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.
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