flyback transformer document 733 document 733 revised 05/04/09 for linear technology lt3573 isolated flyback converter inductance inductance leakage input part at 0 a 2 at i pk 3 dcr max (mohms) 4 inductance turns ratio 6 i pk 3 voltage number 1 10% (h) min (h) pri sec bias max (h) 5 pri : sec : bias (a) (v) output 7 ga3429-bl_ 24.0 21.6 95 7.5 123 0.566 4 : 1 : 1 2.1 20 C 28 3.3 v, 1.5 a 1. when ordering, please specify packaging code: ga3429-bl d packaging: d = 13 machine-ready reel. eia-481 embossed plastic tape (250 parts per full reel). b = less than full reel. in tape, but not machine ready. to have a leader and trailer added ($25 charge), use code letter d instead. 2. inductance is for the primary, measured at 250 khz, 0.3 vrms, 0 adc. 3. i pk is peak primary current drawn at minimum input voltage. 4. dcr for the secondary is per winding. 5. leakage inductance measured between pins 3 and 4 with all secondary pins shorted. 6. turns ratio is with the secondary windings connected in parallel. 7. output is with the secondary windings connected in parallel. bias winding output: 3.3 v, 20 ma . 8. electrical specifcations at 25c. refer to doc 362 soldering surface mount components before soldering. 0.080 2,03 1 0.433 11,00 0.50 12,7 0.041 1,05 0.413 10,50 0.600 15,24 max 0.460 11,68 0.024 0,60 0.050 1,27 0.098 2,50 0.098 2,50 max max 8 1 5 4 recommended land p attern dot abo ve pin1 0.004 /0,10 f a267x-al cci xxxx core material ferrite terminations rohs tin-silver over tin over nickel over phos bronze. other terminations available at additional cost. weight 3.9 to 4.1 g ambient temperature C40c to +85c storage temperature component: C40c to +85c. tape and reel packaging: C40c to +80c resistance to soldering heat max three 40 second refows at +260c, parts cooled to room temperature between cycles moisture sensitivity level (msl) 1 (unlimited foor life at <30c / 85% relative humidity) failures in time (fit) / mean time between failures (mtbf) 38 per billion hours / 26,315,789 hours, calculated per telcordia sr-332 packaging 250 per 13 reel plastic tape: 32 mm wide, 0.5 mm thick, 20 mm pocket spacing, 11.2 mm pocket depth pcb washing tested with pure water or alcohol only. for other solvents, see doc787_pcb_washing.pdf ? designed for the lt3573 isolated flyback converter ? 1500 vrms isolation from primary and bias to secondary; 500 vrms isolation from primary to bias, tested for one minute ? the bias winding provides power to the chipset 6 5 8 7 pr i bias sec 4 1 3 2 secondary windings to be connected in parallel on pc board dimensions are in inches mm us uk t aiwan china singapore +1-847-639-6400 sales@coilcraft.com +44-1236-730595 sales@coilcraft-eur ope.com +886-2-2264 3646 sales@coilcraft.com.tw +86-21-6218 8074 sales@coilcraft.com.cn + 65-6484 8412 sales@coilcraft.com.sg ? coilcraft inc. 2013 this pr oduct may not be used in medical or high risk applications without prior coilcraft appr oval. specification subject to change without notice. please check web site for latest infor mation.
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