Philips Components Product specification Ferrite ring cores (toroids) TN25/15/10 RING CORES (TOROIDS) Effective core parameters SYMBOL PARAMETER VALUE UNIT Σ(I/A) core factor (C1) 1.23 mm−1 Ve effective volume 2944 mm3 Ie effective length 60.2 mm Ae effective area 48.9 mm2 m mass of core ≈15 g 25.8 ±0.7 handbook, halfpage Coating ,, ,, ,,,, 14.0 ±0.6 The cores are coated with polyamide 11 (PA11), flame retardant in accordance with “UL 94V-2” ; UL file number E 45228 (M). (≈0.3) coating PA11 10.6 ±0.5 Isolation voltage CBW306 DC isolation voltage: 2000 V. Contacts are applied on the edge of the ring core, which is also the critical point for the winding operation. Dimensions in mm. Fig.1 TN25/15/10 ring core. Ring core data GRADE AL (nH) µi COLOUR CODE TYPE NUMBER 3F3 1840 ±25% ≈1800 blue TN25/15/10-3F3 3C90 2350 ±25% ≈2300 ultramarine TN25/15/10-3C90 3C11 4400 ±25% ≈4300 white TN25/15/10-3C11 3E25 5620 ±25% ≈5500 orange TN25/15/10-3E25 3E5(1) 8680 ±30% ≈8500 yellow/white TL25/15/10-3E5 3E6(1) 10200 ±30% ≈10000 purple/white TL25/15/10-3E6 Note 1. Ring cores in 3E5 and 3E6 are lacquered (polyurethane) and have different dimensions: Outside diameter = 25.25 ±0.7 mm; Inside diameter = 14.75 ±0.6 mm; Height = 10.25 ±0.5 mm; flame retardant in accordance with “UL 94V-2” ; UL file number E 192048. Properties of cores under power conditions B (mT) at CORE LOSS (W) at H = 250 A/m; f = 25 kHz; T = 100 °C f = 25 kHz; ˆ = 200 mT; B T = 100 °C f = 100 kHz; ˆ = 100 mT; B T = 100 °C f = 400 kHz; ˆ = 50 mT; B T = 100 °C 3C90 ≥320 ≤0.33 ≤0.33 − 3F3 ≥320 − ≤0.32 ≤0.56 GRADE 1999 Dec 23 1