EER42,ETD-core,EER-core,EER40,EER20,EER35,EER cores,EER28,EER30,EER34,EER43,EER45,EER50,ETD cores, HOME PRODUCTS PROFILE CONTACT SITEMAP p EER CORES ETD CORES Description of the “E” patterns The "E" patterns are sought that are easy to assemble, could be interleave to minimize gap effects, and would minimize waste. Since “E” cores have two open coil sides, they provide substantial room to bring high current lead wires out from the coil. It is easier to achieve high voltage electrical isolation with an “E” core. In the typical “E” lamination, the center leg (one of three legs) is twice the width of either outer leg. In theory, magnetic flux flowing out of the center leg divides equally and flows into the outer two "E" core legs. Since the outer legs handle half the flux they only need to have half the cross-section that the center leg has. It is easier to achieve high voltage electrical isolation with an “E” core than with a pot core. Presentation of EER-core and ETD-core EER-core and ETD-core are examples of type “E” cores with round center legs. The combined cross section of the two outer legs of EER cores and ETD cores should equal or exceed that of the center leg. The core stack is a stack of laminations and the typical stack has core legs of rectangular cross-section. Typically the inductor or transformer coil is placed over the center core leg. To minimize winding resistance (hence also minimize winding losses) it is desirable to have a round center leg. A round center leg also eliminates the sharp bend encountered when winding wire around a rectangular leg; consequently a round center leg permits use of larger wire. Achieving round center legs with laminations is possible but very impractical. With the development of powdered cores and ferrite cores it became practical to have a round center leg. EER-core and ETD-core type, such as EER42, EER40, EER20, EER35, EER28, EER30, EER34, EER43, EER45, EER50, etc, ferrite cores are developed for higher power higher frequency switching transformers. Application of EER-core and ETD-core EER cores and ETD cores are usually larger, but have a wide winding area, which makes them particularly good for higher power designs or multiple output designs. Remember a larger core size will be needed for a margin wound type transformer than for a triple insulated type to allow room for the margins. EER cores with round center leg offer ideal features for the design of SMPS transformers chokes. We offer various EER cores and ETD cores, including EER42, EER40, EER20, EER35, EER28, EER30, EER34, EER43, EER45, EER50, EER49, EER25.5, EER55, EER54, EER53, ETD29, ETD34, ETD39, ETD49, ETD44, ETD10, ETD41, ETD32, ETD59, ETD31, and ETD22. Please find our details of ETD-core and EER-core by types and dimensions data shown as below. EER25 EER28A EER28B ETD29 EER30 ETD34 EER35A EER35/34B EER35C EER37 ETD39 EER40A EER40B EER40C EER40D A 25.3±0.6 28.5±0.6 28.5±0.6 29.8±0.8 30.0 ± 0.8 34.2 ± 0.8 35.0 ± 0.7 35.0 ± 0.7 36.0 ± 0.7 36.0 ± 0.6 39.1 ± 0.9 40.0 ± 0.8 44.0 ± 0.8 40.0± 0.7 40.2± 0.5 B 9.3±0.3 14.0 ± 0.3 16.9 ± 0.3 15.8 ± 0.2 17.5 ± 0.3 17.3 ± 0.2 21.0 ± 0.3 16.8 ± 0.3 21.6 ± 0.4 20.7 ± 0.3 19.8 ± 0.2 22.4 ± 0.3 22.4 ± 0.3 22.9 ± 0.3 21.4± 0.3 Dimensions(mm) C D 7.5 ± 0.3 7.5 ± 0.3 11.4 ± 0.3 9.9±0.3 11.4 ± 0.3 9.9 ± 0.3 9.5 ± 0.3 9.5 ± 0.3 11.2 ± 0.3 9.9 ± 0.3 10.8 ± 0.3 10.8 ± 0.3 11.3 ± 0.4 11.3 ± 0.3 11.3 ± 0.4 11.3 ± 0.3 11.3 ± 0.4 11.3 ± 0.4 11.3 ± 0.3 11.3 ± 0.3 12.6 ± 0.4 12.5 ± 0.3 13.3 ± 0.3 13.3 ± 0.3 13.3 ± 0.3 13.3 ± 0.3 13.3 ± 0.3 13.3 ± 0.3 15.5± 0.3 15.5± 0.3 E 19.8 21.2 21.2 22.0 22.5 25.6 25.3 25.3 26.5 27.6 29.3 29.0 29.3 29.5 29.4 F 6.2 ± 0.3 9.6±0.3 12.5 ± 0.3 11.0 ± 0.3 12.6 ± 0.3 12.1 ± 0.3 15.0 ± 0.3 10.8 ± 0.3 15.6 ± 0.4 14.7 ± 0.3 14.6 ± 0.4 15.4 ± 0.3 15.4 ± 0.3 15.9 ± 0.3 15.4± 0.3 EER40E 40.0 +0.6 23.0± 0.3 13.3± 0.3 13.3± 0.3 29.0 16.0± 0.3 EER40F 41.0max 22.8±0.3 13.3±0.4 13.3±0.3 29.5 15.8±0.3 EER40G 40.8 +0.1 21.3±0.2 15.0±0.2 14.0±0.25 30.7 15.3±0.2 EER40H 41.0±0.7 24.0 + 0.3 13.0 +0 13.0 +0 30.0 17.0 +0.3 EER49A 49.0 ±0.8 26.2 ±0.4 17.0 ±0.5 17.0 ±0.5 36.5 18.7 +0.3 EER49B ETD49 EER50 49.0 ±1.0 49.0 ±1.0 50.5 ±0.8 27.0 ±0.3 24.7 ±0.3 27.0 ±0.3 17.2 ±0.4 16.3 ±0.4 18.7 ±0.4 17.2 ±0.3 16.3 ±0.4 18.7 ±0.4 36.5 36.1 38.0 18.7 ±0.3 18.1 ±0.4 18.7 ±0.3 EER53 53.2 ±0.8 23.2 ±0.3 21.5 ±0.3 20.0 +0.2 38.7 16.3 ±0.3 EER54 EER55A EER55B 54.2 ±0.8 56.0 ±0.8 55.9 ±1.0 25.1 ±0.4 30.7 ±0.3 29.0 ±0.3 18.9 ±0.4 20.4 ±0.3 24.3 ±0.5 18.9 ±0.3 20.4 ±0.3 20.2 ±0.3 40.5 44.0 43.5 17.5±0.3 22.9±0.3 20.4±0.3 Type -0.5 -0.5 -0 -0.3 -0.3 -0.3 -0 -0.2 CATALOG EER42,ETD-core,EER-core,EER40,EER20,EER35,EER cores,EER28,EER30,EER34,EER43,EER45,EER50,ETD cores, EER49A 49.0 ±0.8 26.2 ±0.4 17.0 ±0.5 17.0 ±0.5 36.5 18.7 +0.3 EER49B ETD49 EER50 49.0 ±1.0 49.0 ±1.0 50.5 ±0.8 27.0 ±0.3 24.7 ±0.3 27.0 ±0.3 17.2 ±0.4 16.3 ±0.4 18.7 ±0.4 17.2 ±0.3 16.3 ±0.4 18.7 ±0.4 36.5 36.1 38.0 18.7 ±0.3 18.1 ±0.4 18.7 ±0.3 EER53 53.2 ±0.8 23.2 ±0.3 21.5 ±0.3 20.0 +0.2 38.7 16.3 ±0.3 EER54 EER55A EER55B 54.2 ±0.8 56.0 ±0.8 55.9 ±1.0 25.1 ±0.4 30.7 ±0.3 29.0 ±0.3 18.9 ±0.4 20.4 ±0.3 24.3 ±0.5 18.9 ±0.3 20.4 ±0.3 20.2 ±0.3 40.5 44.0 43.5 17.5±0.3 22.9±0.3 20.4±0.3 Type Core parameter C1 (mm-1) Ae (mm2 ) Ie (mm) Ve (mm3 ) EER25 1.09 44.3 48.3 2140 EER28A 0.79 82.1 64 5254 EE28B 0.86 85.6 73.2 6266 ETD29 0.95 73.6 70.6 5196 EER30 0.99 85.5 75.4 6673 ETD34 0.81 97.1 78.6 7632 EER35A 0.84 107 90.8 9716 EER35/34B 0.68 107 72.8 7790 EER35C 0.84 107 90 9630 EER37 0.8 112.1 90.5 10149 ETD39 0.737 125 92.1 1151 EER40A 0.66 149 98 14602 EER40B 0.68 149 102 15198 EER40C 0.67 149 100 14900 EER40D 0.50 187.7 93.9 17415 EER40E 0.65 151 98.2 14828 EER40F 0.65 151 98.1 15215 EER40G 0.609 158 96.3 15230 EER40H 0.7 145 102.8 14906 EER42A 0.547 183 96.3 17623 EER42B 0.528 183.7 96.9 17800 EER42/C 0.5 155.3 97.5 15137 EER43A 0.5 194 98.0 19821 EER43B 0.5 194 96.8 19584 ETD44 0.59 173.0 103.0 17720 EER45 0.6 189.5 105.0 19894 EER49A 0.5 235.8 116.0 27357 EER49B 0.5 241 118 28460 ETD49 0.534 217.6 112.2 24417 EER50 0.437 277.5 117.6 32637 EER53 0.338 319.5 105.9 33828 EER54 1.0 594.1 48.7 28958.2 EER55A 0.62 303.1 188.2 41896.1 EER55B 0.36 353.8 128.7 45533 weight (g/pr.) -0.3 -0.2 AL(nH/N2 ) F2B (±25%) F2BD (± 25%) F2B1 ( ±25%) 12 28 33 28 32 40 53 51 55 52.5 60 78 78 78 78 77 78 80 80 94 92 96 105 102 94 108 112 148 124 170 170 181 220 228 2100 3120 2100 2500 2800 2600 2960 3100 3100 2960 3240 / / / 3830 / / / / / / / / / / / / 3500 3700 / / / / / Copyright 2005 YUXIANG Magnetic Materials Ind. Co.,Ltd.All Rights Reserved. Add:16F1,jinyuan building,NO.57,hubin S.Rd.,Xiamen,China.361004 Tel : (86)592 2225286 (86)592 2219816 (86)592 2217138 Fax: (86)592 2207122 Email : [email protected] [email protected] 2050 3080 2660 ≥2100 2600 2450 2580 2770 2700 2580 2800 3500 3500 3400 3800 3300 3300 3600 3200 4500 4400 3500 4500 4500 4110 5000 6800 6500 3700 5730 6200 4800 7100 1920 2870 2520 2200 2500 2400 2600 2770 2700 2600 2700 3500 3500 3400 3300 3300 3300 3600 3200 4500 4400 3400 4500 4500 4000 4670 6250 6030 4400 5300 6200 4800