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? all specifications are subject to change without notice. (1/15) 001-01 / 20010913 / e6355_srw.fm transformers srw series for power supply (general transformers, barrierless transformer ? ) pin terminal general transformers , barrierless transformer ? the srw series transformer for switching power supplies utilizes ferrite materials, which makes it possible to achieve an incredibly high efficiency in the required frequency range. features by using high efficiency ferrite cores suitable for power conversion with very low power loss and large magnetic flux density it is possible to design transformers that is quite compact in size and high efficiency. a wide variety of shapes and sizes from low output to high output power, gives great flexibility of design switching power supply. bobbins and other components are also available which are capable for a variety of safety regulations such as ul, csa and vde. applications transformers and inductors for switching power supplies used for tvs, crt monitors, vcrs, dvds, printers, air conditioners, ac adaptors, etc. precautionary items regarding the product the maximum output power is a guideline for flyback converter topology operating at 50khz. there may be differences depending upon the circuit topologies. special ferrite materials produced for power transformers with large magnetic flux density are used in the ferrite core, so that temperature rise of transformer is within 45c in standard design condition. transformer temperature may rise even during normal operation, it is advisable that you provide a sufficient mounting distance from parts such as electrolytic capacitors, which do not withstand heat well. a beat sound noise may be generated even under normal operation (no harmful effect on usage). please consult with us concerning usage outside of ratings. the products has not acquired approval for safety regulations, however, it has been constructed with materials and structures that meet with all types of safety regulations. please consult with us about individual categories concerning the acquisition of safety regulations. please make inquiries before use regarding industrial properties outside the ownership of our company regarding the contents stated here. when designing transformers, please feel free to contact with us concerning designs for ferrite materials and standard bobbins, which are not listed. free datasheet http:///
all specifications are subject to change without notice. (2/15) 001-01 / 20010913 / e6355_srw.fm transformers srw series for power supply (general transformers) pin terminal general transformers standard products bobbin material: ul grade(over 94v-2), phenol shapes and dimensions 1-1.srw13es 1-2.srw16es 1-3.srw19es shapes and dimensions fig. no. part no. maximum external dimensions w 14max. 14max. 13.5max. 3typ. pppp p=2.5 0.3 12345 9 10 8 7 6 10- ? 0.6 8.5 0.5 3.5min. pppp 12 345 10 8 7 96 17.5max. 14.5max. 18.5max. p=3.25 0.3 10.5 0.3 10- ? 0.6 p 12345 10 9 6 7 8 20max. 3min. 22.5max. 17max. 12.7 0.5 10- ? 0.7 ppp p=3.81 0.3 dimensions in mm free datasheet http:///
all specifications are subject to change without notice. (3/15) 001-01 / 20010913 / e6355_srw.fm transformers srw series for power supply (general transformers) pin terminal general transformers shapes and dimensions 1-4.SRW25SEC 1-5.srw2820ed-1 (for vcr) 1-6.srw2820ed-2 (for adapter) 1-7.srw2820ed-3 (for air conditioner) 1-8.srw2924ed 1-9.srw2929ed (18-pin) ppp 12 34 8765 20.5max. 22.5max. 3min. p=5 0.3 8- ? 0.8 27.5max. 12.5 0.3 p 24 13 6 57 8 15 16 14 13 11 12 10 9 37max. 27.5max. 27max. 3min. 20 0.5 16- ? 0.8 pppppp p=4 0.3 p 123 456 12 11 10 9 7 pppp p=5 0.3 20 0.5 25max. 26max. 30.5max. 12- ? 0.8 8 3.5min. p 1 p 1 p 1 p 1 p 2 p 2 p 2 p 1 p 1 p 1 p 1 p 2 p 2 p 2 12 34 56 78 1615 14 13 121110 9 27max. 26.5max. 3.5min. 20 0.5 p 1 =3.5 0.3 p 2 =5.5 0.3 35max. 16- ? 0.8 p 12 11 10 9 8 7 123 456 30max. 31max. 31max. 3.5min. 22.5 0.5 p=5 0.3 pppp 12- ? 0.8 p 12345 6789 18 17 16 15 14 13 12 11 10 37.5max. 3.5min. 20 0.5 p=4 0.3 37max. 18- ? 0.8 27.5max. pp pp p pp dimensions in mm free datasheet http:///
all specifications are subject to change without notice. (4/15) 001-01 / 20010913 / e6355_srw.fm transformers srw series for power supply (general transformers) pin terminal general transformers shapes and dimensions 1-10.srw2929ed (12-pin) 1-11.srw3333ed 1-12.srw35ec 1-13 srw40ec 1-14 srw42ec 1-15 srw45lec p 123456 12 11 10987 p=5 0.3 22.5 0.5 3.5min. 37max. 30max. 31max. 12- ? 0.8 pppp p 1 2 3 456 789 20 19 18 17 16 15 14 13 12 11 p=4 0.3 22.5 0.5 50max. 20- ? 1 31.5max. 40max. 3.5min. pppppppp 10 p 123 6 4 578 16 15 14 11 12 13 10 9 pppppp 39.5max. 30max. 39.5max. 3.5min. p=5 0.3 22.5 0.5 16- ? 1 p 123 45 7 689 18 17 16 15 14 12 13 11 10 25 0.5 p=5 0.3 3.5min. 51max. 35max. 47max. ppppppp 18- ? 1 p 12345 6789 18 17 16 15 14 12 13 11 10 25 0.5 54max. 35max. p=5 0.3 3.5min. 47max. ppppppp 18- ? 1 dimensions in mm p 2 1 3456789 17 18 16 15 14 13 12 11 10 18- ? 1 ppppppp 25 0.5 65max. 38max. 50max. p=5 0.3 4min. free datasheet http:///
all specifications are subject to change without notice. (5/15) 001-01 / 20010913 / e6355_srw.fm transformers srw series for power supply (general transformers) pin terminal general transformers shapes and dimensions 1-16.srw49ec 1-17.srw49lec 1-18.srw13epc 1-19.srw17epc 1-20.srw19epc 1-21.srw2220em p 12345 6789 18 17 16 15 14 12 13 11 10 18- ? 1 ppppppp 28 0.5 55max. 37max. 52max. p=5 0.3 4min. 1234 7 689 5 18 17 16 15 12 11 10 14 13 p ppppp p p 18- ? 1 28 0.5 63max. p=5 0.3 4min. 38max. 52max. p 2 1 345 9 10 876 ppp 10.5 0.5 2min. 8.5max. 15max. 15max. p=2.5 0.3 10- 0.49 p 1 p 1 p 1 1234 1098765 p 2 p 2 p 2 p 2 p 2 10- ? 0.6 15 0.15 3.5min. 13max. p 1 =3.75 0.3 p 2 =2.5 0.3 20max. 19.5max. p 1 p 1 p 1 p 1 12345 11 10 9 8 7 6 p 2 p 2 p 2 p 2 p 2 11- 0.49 16.25 0.3 p 1 =3.75 0.3 p 2 =2.5 0.3 3.5min. 13max. 22max. 21max. p 1 p 1 p 1 1234 98765 p 2 p 2 p 2 p 2 9- ? 0.8 14.7 0.5 17.5 0.5 3.5min. p 1 =5 0.3 p 2 =3.75 0.3 17max. 22.5max. 24max. dimensions in mm free datasheet http:///
all specifications are subject to change without notice. (6/15) 001-01 / 20010913 / e6355_srw.fm transformers srw series for power supply (general transformers) pin terminal general transformers shapes and dimensions 1-22.srw27em 1-23.srw28ec (f) p 1 p 1 p 1 p 1 12345 11 10 9 8 7 6 p 2 p 2 p 2 p 2 p 2 11- ? 0.9 25 0.5 3.5min. 17max. 29max. 29max. p 1 =5 0.3 p 2 =4 0.3 ppppp 12 3 456 12 11 8 7 10 9 12- ? 0.8 30 0.5 3.5min. p=5 0.3 26max. 38max. 31max. dimensions in mm free datasheet http:///
all specifications are subject to change without notice. (7/15) 001-01 / 20010913 / e6355_srw.fm transformers srw series for power supply (barrierless transformer ? ) pin terminal barrierless transformer ? standard product shapes and dimensions 2-1.srw24es3 2-2.srw2820ed5 (for vcr and dvd) 2-3.srw2820ed7 (for air conditioner) shapes and dimensions fig. no. part no. maximum external dimensions w d h(mm)max. rated output power (w)max. core sectional area (cm 2 ) number of bobbin divisions no. of pin terminal 2-1 srw24es3 25.5 20 20 15 0.5 3 9 2-2 srw2820ed5 31 31 24 25 0.82 5 14 2-3 srw2820ed7 33 27 26.5 25 0.82 7 16 2-4 srw3020ed5 35.5 33 24 25 0.82 5 16 2-5 srw3741ec9 45 36 48 80 1.03 9 20 2-6 srw4245ec9 51 41 51 130 1.48 9 20 2-7 srw4551ec9 55 43 58 150 1.85 9 22 20max. 3.5 1 20max. 5 1234 25.5max. p 1 =3.5 0.1 p 2 =5 0.3 6 7 8 9 160.5 p 1 p 1 p 1 p 1 p 2 p 2 p 2 9- ? 0.8 p 1 123456 14 13 10 11 12 987 p 2 p 2 p 2 p 2 p 2 p 2 p 2 p 1 p 1 p 1 p 1 200.5 3.5 1 24max. 31max. p 1 =5 0.3 p 2 =3.5 0.3 31max. 14- ? 0.8 p 1 p 1 p 1 p 1 p 1 p 1 p 1 p 1 p 2 p 2 p 2 p 2 p 2 p 2 12 34 56 78 16 15 14 13 12 11 10 9 16- ? 0.8 20 0.5 3.51 p 1 =3.5 0.3 p 2 =5.5 0.3 26.5max. 27max. 33max. dimensions in mm free datasheet http:///
all specifications are subject to change without notice. (8/15) 001-01 / 20010913 / e6355_srw.fm transformers srw series for power supply (barrierless transformer ? ) pin terminal barrierless transformer ? shapes and dimensions 2-4.srw3020ed5 (for vcr and dvd) 2-5.srw3741ec9 2-6.srw4245ec9 2-7.srw4551ec9 p 1 p 2 p 2 p 2 p 2 p 2 p 2 p 2 p 2 p 2 123456 15 16 1413121110 987 p 1 p 1 p 1 p 1 16- ? 0.8 20 0.5 3.5 1 24max. 33max. p 1 =5 0.3 p 2 =3.5 0.3 (31max.) 35.5max. 20 19 18 17 16 15 14 1312 12 ppppppppp 345678910 11 20- ? 1 42max. 45max. 36max. 32max. 22.5 0.5 48max. 4.5 1 p=40.3 20 51max. 50max. 41max. 36max. 25 0.5 51max. 4.5 1 1 ppppppppp p=50.3 2345678910 11 19 18 17 16 15 14 13 12 20- ? 1 dimensions in mm 55max. 55max. 43max. 37.5max. 27.5 0.5 22- ? 1 58max. 4.5 1 22 21 20 19 18 17 16 15 14 13 123456789 10 11 12 p=50.3 pppppppppp free datasheet http:///
all specifications are subject to change without notice. (9/15) 001-01 / 20010913 / e6355_srw.fm transformers srw series for power supply (high voltage transformers) pin terminal high voltage transformers the srw series transformer for switching power supplies utilizes ferrite materials, which makes it possible to achieve an incredibly high efficiency in the required frequency range. features by using high efficiency ferrite cores suitable for power conversion with very low power loss and large magnetic flux density it is possible to design transformers that is quite compact in size and high efficiency. by using pressure-tight materials and highly reliable construction, we achieved to get multi-divided bobbins. applications for tv ? s and crt monitors. high-voltage transformers such as dynamic focus transformers, horizontal output transformers, and dummy coils. precautionary items regarding the product the maximum output power is a guideline for flyback converter topology operating at 50khz. there may be differences depending upon the circuit topologies. special ferrite materials produced for power transformers with large magnetic flux density are used in the ferrite core, so that temperature rise of transformer is within 45 c in standard design condition. transformer temperature may rise even during normal operation, it is advisable that you provide a sufficient mounting distance from parts such as electrolytic capacitors, which do not withstand heat well. a beat sound noise may be generated even under normal operation (no harmful effect on usage). please consult with us concerning usage outside of ratings. please make inquiries before use regarding industrial properties outside the ownership of our company regarding the contents stated here. when designing transformers, please feel free to contact with us concerning designs for ferrite materials and standard bobbins, which are not listed. standard product shapes and dimensions fig. no. part no. maximum external dimensions w d h(mm)max. core sectional area (cm 2 ) number of bobbin divisions primary/secondary no. of pin terminal 3-1 srw16es4-h 17 16 12.5 0.19 1/3 12 3-2 srw1916es6-h 21 17.5 12.5 0.22 1/5 12 3-3 srw2224es6-h 24 26 19.5 0.33 1/5 12 3-4 SRW25SEC4-v 20 27.5 24 0.42 1/3 11 3-5 srw28lec8-v 26.5 31 39 0.77 2/6 5 3-6 srw2929ed5-v 30 31 37 0.82 1/4 12 free datasheet http:///
all specifications are subject to change without notice. (10/15) 001-01 / 20010913 / e6355_srw.fm transformers srw series for power supply (high voltage transformers) pin terminal high voltage transformers shapes and dimensions 3-1.srw16es4-h 3-2.srw1916es6-h 3-3.srw2224es6-h 3-4.SRW25SEC4-v 3-5.srw28lec8-v 3-6.srw2929ed5-v 17max. 3.5 0.5 12.5max. p=2.5 0.1 12- 0.5 1 ppppp 23456 12.5 0.3 16max. 12 7 98 1110 21max. 2.8 0.5 12.5max. p=2.5 0.1 1 ppppp 23456 12 13.5 0.3 17.5max. 12- 0.5 7 11 10 98 24max. 19.5max. 4 1 15.5 0.3 26max. 12 ppppp 3456 12 7 11 10 98 p=3.75 0.1 12- 0.64 or ? 0.8 27.5max. 24max. 4 1 15 0.3 20max. 123 4 5 6 11 7 10 9 8 11- 0.56 p 2 p 2 p 2 p 2 p 2 p 2 p 1 =2.5 0.1 p 2 =5 0.1 p 2 p 1 p 1 31max. 39max. 4.5 1 26.5max. 22 0.3 5- ? 0.7 p=9 0.1 6 2 1 pp 3 4 12 12 ppppp 3456 7 8 9 10 11 12- ? 0.8 31max. 37max. 4.5 1 30max. 22.5 0.3 p=5 0.1 dimensions in mm free datasheet http:///
all specifications are subject to change without notice. (11/15) 001-01 / 20010913 / e6355_srw.fm transformers srw series for power supply (specifications) pin terminal specifications general characteristics reliability testsreliability tests the above listed items are representative examples. the details can be found by referring to the appended individual delivery specifications. temperature ranges operating ? 10 to +60 c storage ? 25 to +85 c humidity ranges operating 30 to 95(%)rh[without dewing] storage 30 to 95(%)rh[without dewing] standard test conditions ambient temperature range +5 to +35 c relative humidity range 45 to 85(%)rh[without dewing] item standard test methods inductance individual specification (tolerance10%) use lcr meter (f=1khz), yhp4261 or equivalent. dc resistance less than 0.05 ? : +30% max. 0.05 to 0.1 ? : +20% max. 0.1 to 0.5 ? : +15% max. 0.5 ? or more: +10% max. use milliohm-meter vp2941 or equivalent. turn ratio and polarity specified value 1 to 20%, individual specification use turn ratio tester trd-0.9 (f=1 to 100khz) or equivalent. withstand voltage no abnormality between the primary and secondary windings, between the primary winding and the core, and so on. apply separately specified ac voltage (50hz) for 1min. insulation resistance 10m ? min. measure by applying dc.500v. use insulation resistance meter sm-5e or equivalent. terminal strength 9.8n min. apply 9.8n load in the direction of terminal axis for 305s. any terminal must not be pulled out or chatter. temperature rise standard design value 45 c max. (thermocouple method) 55 c max. (resistance method) measure the core surface by thermocouple method, and the windings by resistance method or thermocouple method. solderability solder covers more than 90%. dip in solder with the temperature of 2305 c for 20.5s. item standards test methods vibration resistance standard of inductance, insulation resis- tance, withstand voltage must be satis- fied. conform to jis-c 5025. sweep 1.5mm amplitude and 10-to-50-to-10hz in 1min in x, y, and z directions for 2h respectively. heat resistance measure in normal temperature after leaving in 1002 c for 96h. cold resistance measure in normal temperature after leaving in ? 402 c for 96h. humidity resistance measure in normal temperature after leaving in 602 c and 90 to 95(%)rh for 96h. temperature cycle one cycle is ? 25 c for 30min, normal temperature for 30min, and 85 c for 30min; measure after 10 cycles of the test have been performed. free datasheet http:///
all specifications are subject to change without notice. (12/15) 001-01 / 20010913 / e6355_srw.fm transformers srw series for power supply (design reference) pin terminal design reference for switching power transformers maximum allowable temperature the maximum allowable temperature of srw series transformer is classified in e class (120 c) in japan. however, due to the fact that there is no classification known as e class in north america, it is classified in class 105 (105 c). temperature rise in transformers in normal design condition, 55 c or less (using the resistance method) is the target of temperature rise of windings. therefore, the maximum ambient temperature in maximum temperature rise is 65 c in japan and 50 c for products targeted for north america. in case of measuring the temperature of the windings by thermo- couple, 10 to 15 c more would be allowable. concerning of the influence of leakage flux due to the fact that there is always some degree of leakage flux from transformer, designs should be made to keep them apart as much as possible from parts that are easily affected by this. magnetic saturation of the core (1)magnetic operating condition of the core in the transformer are determined by maximum operation temperature (including temperature rise) and driving condition in circuits. if product is used in condition that exceed these conditions, there is a possibility of occurring magnetic saturation of the core. the following items could be possible cause of core saturation. the product is used in conditions that exceed the maximum operating temperature. operating frequencies are lower than the ones initially designed. (longer on time) the input voltage is abnormally higher than the specified values. (2)to check on the saturation of the core it is possible to judge from current waveforms of primary winding. current flowing in the inductor changes in a straight line in relation to time as in the figure a) in accordance with however, in the event that a saturation phenomena has occurred in the core, inductance is reduced causing a rapid and drastic increase of current as shown figure b). (3)in this case, there is possibility that a breakdown may occur due to surpassing the rated current of the switch it is necessary to have over current protection circuit or modify transformer design. dealing with safety regulation designs are made in consideration of materials, structures an so on that the designed transformers are comply with designated safety regulations. (1)regarding the core dentori, ul/csa: designed with reinforced insulation. (depending upon the shape, basic insulation may be applied) iec65, iec950: to be handled in the same manner as basic insulation. (2)distance between transformer and other parts please keep the distance between the transformer and other parts in according with applicable safety standards. damp proofing treatment in order to protect the transformer against humidity as well as securing of the core and bobbin, varnish impregnation is used as standard design. circuit topologies of switching power supply the term ? topology ? refers to the arrangement of the power com- ponents within the switching power supply design. there are sev- eral different kind of circuit topologies as following; forward mode buck converter forward converter push-pull converter half and full-bridge converter flyback mode boost converter buck-boost converter flyback converter l= t. e l +e ip lp a)- normal b)- saturation phenomena free datasheet http:///
all specifications are subject to change without notice. (13/15) 001-01 / 20010913 / e6355_srw.fm transformers srw series for power supply (design reference) pin terminal design reference for switching power transformers which topology of switching power supply to use? each topology has its relative merit in terms of cost and perfor- mance. one topology may have a low parts cost but only be able to provide a limited amount of power; another may have ample power capability but cost more, and so on. the following relationship between output voltage and power give us one suggestion when we need to chose topology in given con- ditions; the deference of power conversion between forward and flyback mode. since the forward mode converter is a system that performs power transmission to the output side during on period of switching tran- sistor, it is possible to work with the large output current. conse- quently, forward converter method is suitable to large current output with relatively lower output voltage. to the contrary, flyback mode converter is a system that input power is stored within the inductor or primary coil in the trans- former as a magnetic energy during on period of switching tran- sistor and the stored energy transmit to output side during off period of switching transistor. accordingly, flyback mode con- verter is suitable to high voltage and low current output, and does not suite to large current output. the stored energy within the inductor. the stored energy in the inductor lp becomes and thus the power is the energy per unit time, resulting in where, lp: inductance of primary winding ip: peak value of primary current f: switching frequency how to decide primary inductance (lp) in flyback con- verter. using the formula , it is possible to calculate the inductance value needed for the desired output p under the fixed ip value. by deriving e t=lp i from the formula , the current which flows through the inductor becomes . by substituting this with p= ...., the formula of results. from this, the formula results. where, e: input voltage t: on time f: switching frequency in actual designs this value is to be slightly lowered in consider- ation of the transformer ? s efficiency. how to decide number of turns of primary winding (1)flyback converter where, emin: lower limit value of input voltage [vdc] a: core cross section area [m 2 ] d: duty ratio tmax: the maximum on time for switching transistor [sec.] ? : operating flux density [t] precautions must be taken as the upper limit value of ? b changes according to core materials, operating temperatures, frequencies, etc. (2)forward converter the calculation formula of primary winding np is same as in case (1). however, in accordance with separate excitation, the on time (tmax.) should be lower than 45% of switching period. further, it is necessary to consider the residual magnetic flux density of the core, ? b should be slightly lower than that with the frlyback converter. on-off type on-off type and on-on type ( 1-transistor type forward ) on-on type ( multi-transistor type ) 0 0 10 100 1000 10 100 1000 output voltage ( w ) output voltage ( v ) on-off type: for high voltage/small current on-on type: for low voltage/large current e ip lp +v 0 w= l p i p 2 [j] 1 2 p= = l p i p 2 f[w] [j] [s] 1 2 p= l p i p 2 f[w] 1 2 e=l p di dt i= e t l p p= l p f= f 1 2 e t l p () 2 1 2 e 2 t 2 l p l p = f e 2 t 2 2 p n p = emin. tmax. ? b a free datasheet http:///
all specifications are subject to change without notice. (14/15) 001-01 / 20010913 / e6355_srw.fm transformers srw series for power supply (design reference) pin terminal design reference for switching power transformers determining of secondary winding (1)flyback converter as it is necessary to consider the voltage drop of the rectifier diode on the secondary side, where, vf: voltage drop of the rectifier diode (2) forward converter output filter inductor must be used at secondary side in the for- ward converter, the voltage drop of the inductor also need to be considered, resulting, where, vl: voltage drop of the output filter inductor example of drive waveforms ringing choke system circuit (rcc) 1-transistor forward type converter n s =n p v o +v f emin. 1 ? d d n s =n p (v o +v f +v l ) 1/d emin. voltage ( v ce ) collector current ( i c ) t r r 1 r 2 d 1 e +v o c + d 2 c 1 c 2 + ? l 1 t 1 t r1 r 1 d 2 d 1 d 3 e o +v o o voltage ( v ce ) collector current ( i c ) free datasheet http:///
all specifications are subject to change without notice. (15/15) 001-01 / 20010913 / e6355_srw.fm transformers srw series for power supply (design reference) pin terminal in order for designing the transformer, the following condi- tions are necessary. it is greatly appreciated customer give us those conditions by filling out required information with the appended ? transformer specifi- cations / inquiry form ? . (1)circuit topology flyback type, forward type, push-pull, half-bridge, etc (2)input voltage range the lower limit of rectified voltage is important, in particular. (3) operating frequency it is especially necessary to determine the lower limit frequency for the maximum load condition in flyback converter. (4) maximum duty ratio it is necessary to specify maximum on time when input voltage is lower limit, approximately 45% should be the maximum for external excitation system. (5)maximum temperature rise this is the allowable temperature rise in the transformer, should be equal to the value that ambient temperature has been taken from the temperature index of the materials which is 120 c(105 c in ul system). (6)required safety regulations structures and materials are chosen to comply with required safety regulations. (7)output voltage/current required for determination of the winding ratios and wire gage. (8)instructions concerning circuit designs and pin configuration of transformer type of the secondary rectifier diode is important in particular because of voltage drop between first recovery and schottky barrier type is different, it will affect to design of number of turns of transformer. free datasheet http:///

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