Philips Components Product specification Ferrite ring cores (toroids) TN23/14/7 RING CORES (TOROIDS) Effective core parameters SYMBOL PARAMETER VALUE UNIT Σ(I/A) core factor (C1) 1.81 mm−1 Ve effective volume 1722 mm3 Ie effective length 55.8 mm Ae effective area 30.9 mm2 m mass of core ≈8.4 g 23.7 ±0.7 handbook, halfpage ,, ,, ,,,, 13.1 ±0.6 Coating (≈0.3) The cores are coated with polyamide 11 (PA11), flame retardant in accordance with “UL 94V-2” ; UL file number E 45228 (M). coating PA11 7.5 ±0.45 Isolation voltage CBW307 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 TN23/14/7 ring core. Ring core data GRADE AL (nH) 4C65 87 ±25% 4A11 485 ±25% 3R1(1) − µi COLOUR CODE TYPE NUMBER ≈125 violet TN23/14/7-4C65 ≈700 pink TN23/14/7-4A11 ≈800 black TN23/14/7-3R1 3F3 1250 ±25% ≈1800 blue TN23/14/7-3F3 3C90 1600 ±25% ≈2300 ultramarine TN23/14/7-3C90 3C11 3000 ±25% ≈4300 white TN23/14/7-3C11 3E25 3820 ±25% ≈5500 orange TN23/14/7-3E25 Note 1. Due to the rectangular BH-loop of 3R1, inductance values strongly depend on the magnetic state of the ring core and measuring conditions. Therefore no AL value is specified. For the application in magnetic amplifiers AL is not a critical parameter. WARNING Do not use grade 3R1 cores close to their mechanical resonant frequency. For more information refer to “3R1” material specification in this data handbook. 1999 Dec 23 1 Philips Components Product specification Ferrite ring cores (toroids) TN23/14/7 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 ≤0.19 ≤0.19 − 3F3 ≥320 − ≤0.19 ≤0.33 GRADE 1999 Dec 23 2