556 siemens matsushita components l e core with flattened, lower center leg for especially flat transformer design l for dc/dc converters l efd cores are supplied as single units magnetic characteristics (per set) s l/a = 0,99 mm C1 l e = 68 mm a e = 69 mm 2 a min = 69 mm 2 v e = 4 690 mm 3 approx. weight 24 g/set ungapped gapped the a l value in the table applies to a core set comprising one ungapped core (dimension g =0)and one gapped core (dimension g > 0). calculation factors (see page 423 for formulas) validity range: k1 , k2 : 0,10 mm < s < 2,00 mm k3 , k4 : 70 nh < a l < 630 nh material a l value nh m e a l1min nh p v w/set ordering code n67 2050 + 30/C 20 % 1610 1280 3,00 (200 mt, 100 khz, 100 ?c) b66423-g-x167 n87 2050 + 30/C 20 % 1610 1280 2,60 (200 mt, 100 khz, 100 ?c) b66423-g-x187 material a l value nh m e g approx. mm ordering code ** = 67 (n67) = 87 (n87) n67, 160 10 % 125 0,71 b66423-u160-k1** n87 250 10 % 196 0,38 b66423-u250-k1** 315 10 % 246 0,27 b66423-u315-k1** material relationship between air gap C a l value calculation of saturation current k1 (25 ?c) k2 (25 ?c) k3 (25 ?c) k4 (25 ?c) k3 (100 ?c) k4 (100 ?c) n67 125 C 0,712 172 C 0,820 166 C 0,881 n87 125 C 0,712 176 C 0,796 161 C 0,873 efd 30/15/9 core b66423
siemens matsushita components 557 coil former material: gfr thermosetting plastic (ul 94 v-0, insulation class to iec 60085: f max. operating temperature 155 ?c), color code green solderability: to iec 60068-2-20, test ta, method 1 (aging 3): 235 ?c, 2 s resistance to soldering heat: to iec 60068-2-20, test tb, method 1b: 350 ?c, 3,5 s winding: see page 156 square pins yoke l material: stainless spring steel (0,45 mm) coil former yoke coil former ordering code sections a n mm 2 l n mm a r value mw pins 1 52,3 56,7 37,3 12 b66424-b1012-d1 yoke (ordering code per piece, 2 are required) b66424-b2000 mounting holes marking of pin 1 view a cusn6, tinned thermosetting plastic efd 30/15/9 accessories b66424
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