1999 dec 23 1 philips components product speci?cation ferrite ring cores (toroids) tn25/15/10 ring cores (toroids) effective core parameters coating the cores are coated with polyamide 11 (pa11), flame retardant in accordance with ul 94v-2 ; ul file number e 45228 (m). isolation voltage 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. symbol parameter value unit s (i/a) core factor (c1) 1.23 mm - 1 v e effective volume 2944 mm 3 i e effective length 60.2 mm a e effective area 48.9 mm 2 m mass of core ? 15 g fig.1 tn25/15/10 ring core. dimensions in mm. handbook, halfpage cbw306 14.0 0.6 10.6 0.5 coating pa11 ( ? 0.3) 25.8 0.7 ring core data 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 grade a l (nh) m i 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 grade b (mt) at core loss (w) at h = 250 a/m; f = 25 khz; t = 100 c f = 25 khz; = 200 mt; t = 100 c f = 100 khz; = 100 mt; t = 100 c f = 400 khz; =50mt; t = 100 c 3c90 3 320 0.33 0.33 - 3f3 3 320 - 0.32 0.56 b ? b ? b ?
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