B66421

www.DataSheet4U.com Ferrites and accessories EFD 25/13/9 Core and accessories Series/Type: Date: B66421, B66422 September 2006 Data Sheet  EPCOS AG 2006. Reproduction, publication and dissemination of this data sheet and the information contained therein without EPCOS’ prior express consent is prohibited. www.DataSheet4U.com EFD 25/13/9 Core ■ E core with flattened, lower center leg B66421 for especially flat transformer design ■ For DC/DC converters ■ Delivery mode: single units Magnetic characteristics (per set) Σ l/ A le Ae Amin Ve = 0.98 mm–1 = 57 mm = 58 mm2 = 57 mm2 = 3310 mm3 Approx. weight 16.6 g/set Ungapped Material N87 N97 AL value nH 2000 +30/–20% 2100 +30/–20% µe 1560 1640 PV W/set < 1.8 (200 mT, 100 kHz, 100 °C) < 1.5 (200 mT, 100 kHz, 100 °C) Ordering code B66421G0000X187 B66421G0000X197 Gapped Material N87 AL value nH 160 ±10% 250 ±10% 315 ±10% µe 125 195 246 g approx. mm 0.55 0.30 0.22 Ordering code B66421U0160K187 B66421U0250K187 B66421U0315K187 The AL 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 (for formulas, see “E cores: general information”) Material Relationship between air gap – AL value K1 (25 °C) N87 Validity range: 103 K2 (25 °C) – 0.734 Calculation of saturation current K3 (25 °C) 154 K4 (25 °C) – 0.796 K3 (100 °C) K4 (100 °C) 138 – 0.873 K1, K2: 0.10 mm < s < 1.40 mm K3, K4: 50 nH < AL < 410 nH Please read Cautions and warnings an...