shenzhen sunyuan technology co., ltd. wrexxxxs-2w series dc-dc converter copyright @ shenzhen sunyuan technology co., ltd. edition-szsy-07-01 printed in p.r.c january 2007 page 1 of 4 rated 2w output high power density sip 10 package dual output industrial standard pin-out no heat sink required 3kvdc isolation wide input regulated output pcb mounting over current&short circuit protection electrical specifications all specifications tested typically @ 25c, humidity<75% , nominal input and rated output unless otherwise noted. common specifications items testing condition min typ. max operating temperature range -40c +85c output specifications items: testing condition min typ max output accuracy: at full load and nominal vin 2% output power: 0.2w 2w line regulation: input voltage from low to full load 2% load regulation: from 20% to full load 0.5% ripple and noise: 20mhzbandwidth 20 mv p-p temperature drift: 0.02 %/c minimum load 10% switching frequency 100khz over load protection % of fl at nominal input 120 short circuit protection >30seconds input specifications items: testing condition min typ max 5vdc nominal input 4.5-7.25vdc 9vdc nominal input 8-14 vdc 12vdc nominal input 10-16vdc 15vdc nominal input 12-18 vdc input voltage range 24vdc nominal input 19.6-30vdc input filter pi start-up time 500ms
shenzhen sunyuan technology co., ltd. wrexxxxs-2w series dc-dc converter copyright @ shenzhen sunyuan technology co., ltd. edition-szsy-07-01 printed in p.r.c january 2007 page 2 of 4 storage temperature range -55c +105c humidity <75% cooling free air convection isolation voltage (vdc) input to output 3,000 isolation resistance (ohms) 10 9 isolation capacitance (pf) 60 efficiency (%) see product list 60 85 case material non-conductive black plastic potting material epoxy resin ul94-v0 packing material tube dimension (mm / inch) 27.5*8.80*11.00 (1.08*0.34*0.43) weight (g) 10 mtbf (hrs) >1,000,000 product list input voltage (vdc) output part number range nominal max. current (ma) voltage (vdc) efficiency (%, typ.) package wre0503s-2w 5 7.25 303 3.3 63 sip wre0505s-2w 5 7.25 200 5 67 sip wre0509s-2w 5 7.25 111 9 71 sip wre0512s-2w 5 7.25 83 12 74 sip wre0515s-2w 5 7.25 67 15 75 sip wre0524s-2w 4.5-7.25 5 7.25 41 24 76 sip wre0903s-2w 9 14 303 3.3 64 sip wre0905s-2w 9 14 200 5 67 sip wre0909s-2w 9 14 111 9 69 sip wre0912s-2w 9 14 83 12 75 sip wre0915s-2w 9 14 67 15 79 sip wre0924s-2w 8-14 9 14 41 24 79 sip wre1203s-2w 12 16 303 3.3 64 sip wre1205s-2w 12 16 200 5 68 sip wre1209s-2w 12 16 111 9 71 sip wre1212s-2w 12 16 83 12 73 sip wre1215s-2w 12 16 67 15 74 sip wre1224s-2w 10-16 12 16 41 24 79 sip wre1503s-2w 15 18 303 3.3 64 sip wre1505s-2w 15 18 200 5 69 sip wre1509s-2w 15 18 111 9 73 sip wre1512s-2w 15 18 83 12 80 sip wre1515s-2w 15 18 67 15 81 sip wre1524s-2w 12-18 15 18 41 24 82 sip wre2403s-2w 19.6-30 24 30 303 3.3 65 sip wre2405s-2w 24 30 200 5 71 sip wre2409s-2w 24 30 111 9 75 sip wre2412s-2w 24 30 83 12 79 sip wre2415s-2w 24 30 67 15 84 sip wre2424s-2w 19.6-30 24 30 41 24 84 sip
shenzhen sunyuan technology co., ltd. wrexxxxs-2w series dc-dc converter copyright @ shenzhen sunyuan technology co., ltd. edition-szsy-07-01 printed in p.r.c january 2007 page 3 of 4 connecting dc-dc converters in series galvanic isolation of the output allows multiple converters to be connected in series simply by connecting the positive output of one converter to the negative of another (see figure 1). in this way, non-standard voltage rails can be ge nerated, however, the current output of th e highest output voltage converter should not be exceeded. when conve rters are connected in series, additional filtering is strongl y recommended as the converters switching circuits are not synchronized. as well as a summation of the ri pple voltages, the output could also produce relatively large be at frequencies. a capacitor across the output will help , as will a series inductor. connecting dc-dc converters in parallel if the available power output from a single converter is inadequate for the application, then multiple converters can be parall eled to produce a higher output power. however, it is not recommended to parallel converters to generate a hi gher power output, please select our higher power output modules or contact us fo r a customized solution. it should be noted that it is always preferable to parallel mu ltiple converters of the same type. for instance, if a 2.5w conve rter is required, then either 2pcs axxxxs-2w should be used or 3 axxxxs-1w, not an a xxxxs-2w and an axxxxs-1w. the reas on for this is that the output voltages are not sufficiently well matched to guarantee that an axxxxs-2w would suppl y twice as much as an axxxxs -1w and the situation would occur where there was only 1w being drawn from the axxxxs-2 w and 1.5w from axxxxs-1w. even with para lleled converters of the same type, loa ding will be uneven, however, there is only likely to be around a 10% differen ce in output load when the output voltages are well matched. when connecting converter outputs, it should be remembered that the switching will not be synchronous, hence some form of coupl ing should be employed. one possible solution is to use a diode feed, this is suitable mainly for 12v and 15v output types only where the dio de voltage drop (typically 0.6v) will not significantly af fect the circuit functionality (see figure 2). with 5v and 9v supplies the diode drop is generally too large to consider as a suitable means of connecting paralleled converters. this method also has a beat frequency that will superimpose i tself over the ripple of the two converters, this can be reduced by using an external capacitor at the paralleled ou tput. the preferred method of con necting converters in parallel is via series inductors on the out put (see figure 3). this configuration not only has a lower loss of voltage than the diode method, but by suitable choice of inductor and an additional external capacitor, the beat frequency can be significantly reduced, as will the ripple from each converter. suitable values are given in the table below (see ta ble 1), these typically reduce the beat and ripple frequencies b y a factor of 10. isolation one of the main features of the majority of sunyuan components dc-dc converters is th e high galvanic isol ation capability. this allows several variations on circuit topography by using a single dc-dc converter. the basic input to output isolation can be used to provide either a simple isolated output power source, or to gene rate different voltage rails and /or dual pol arity rails. these configurations are most often found in data processing, instrumentation and other noise sensitive circuits where it is necessary to isolate the load and noise presented to the local power supply rails from that of an entire system. usually local supply noise appears as common mode noise at the converter and does not poll ute the main system power supply rails. the isolated positive output can be connected to the input ground rail to generate a negative supply rail i f required. since the output is isolated from the input the choice of reference for the output side can be relatively arbitrary, for example an addit ional single rail can be generated above the main supply rail or offset by some other dc value. regulated converters need more consideration than the unregulat ed type for mixing the reference level. essentially the single s upply rail has a regulator in its positive output rail only, hence referring the is olated ground will only work if all the current return is thr ough the dc-dc and not via other external components, such as diode bi as, resistor feed. have an alternative re turn path can upset the regulation and the performance of the system may not equal that of the converter. in one word, the is olation features are to generate two completely independent powe r supply but also united perfectly through the modern technology . this has been widely used in the appl ication of mixed circuits, a/d, d/a and ot her circuits that are sensitive to noise. filtering all sunyuan isolated dc-dc converters have a fixed characteristic frequency at which the device operates. this fixed frequency allows filtering that is relatively simple compared to pul se-skipping types. in a pulse-skipping convert er a large range of frequencies are enco untered as the device adjusts the pulse interval for loading conditions.
shenzhen sunyuan technology co., ltd. wrexxxxs-2w series dc-dc converter copyright @ shenzhen sunyuan technology co., ltd. edition-szsy-07-01 printed in p.r.c january 2007 page 4 of 4 nomenclature temperature derating graph typical connection outline dimension pins description shenzhen sunyuan technology co., ltd. 3f, 3bldg, duoli industrial zone, meihua rd. futian district, shenzhen 518049, china tel: +86-755-83100080 fax: +86-755-83116652 email: info@szsunyuan.com www.szsunyuan.com pin connection 1 +vin input 2 gnd input 7 +vo output 10 0v output 9 -vo output -vin cin dc-dc converter +vo -vo 0v +vin c out2 120 100 80 60 40 20 0 -40 0407185120 safe operating area o utput power % operating temp (celsius)
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