B66418

www.DataSheet4U.com Ferrites and accessories EFD 20/10/7 Core and accessories Series/Type: Date: B66417, B66418 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 20/10/7 Core ■ E core with flattened, lower center leg B66417 for especially flat transformer design ■ For DC/DC converters ■ Delivery mode: single units Magnetic characteristics (per set) Σ l/ A le Ae Amin Ve = 1.52 mm–1 = 47 mm = 31 mm2 = 31 mm2 = 1460 mm3 Approx. weight 7.2 g/set Ungapped Material N49 N87 N97 AL value nH 910 +30/–20% 1200 +30/–20% 1250 +30/–20% µe 1100 1440 1510 PV W/set < 0.29 ( 50 mT, 500 kHz, 100 °C) < 1.05 (200 mT, 100 kHz, 100 °C) < 0.80 (200 mT, 100 kHz, 100 °C) Ordering code B66417G0000X149 B66417G0000X187 B66417G0000X197 Gapped Material N87 AL value nH 100 ±10% 160 ±10% µe 120 193 g approx. mm 0.49 0.25 Ordering code B66417U0100K187 B66417U0160K187 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: 61.1 K2 (25 °C) – 0.699 Calculation of saturation current K3 (25 °C) 85.4 K4 (25 °C) – 0.796 K3 (100 °C) K4 (100 °C) 75.7 – 0.873 K1, K2: 0.10 mm < s < 1.40 mm K3, K4: 50 nH < AL < 410...