1999 dec 23 1 philips components product speci?cation ferrite ring cores (toroids) tn23/14/7 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) 1.81 mm - 1 v e effective volume 1722 mm 3 i e effective length 55.8 mm a e effective area 30.9 mm 2 m mass of core ? 8.4 g fig.1 tn23/14/7 ring core. dimensions in mm. handbook, halfpage cbw307 13.1 0.6 7.5 0.45 coating pa11 ( ? 0.3) 23.7 0.7 ring core data 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 a l value is specified. for the application in magnetic amplifiers a l is not a critical parameter. grade a l (nh) m i colour code type number 4c65 87 25% ? 125 violet tn23/14/7-4c65 4a11 485 25% ? 700 pink tn23/14/7-4a11 3r1 (1) -? 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 warning do not use grade 3r1 cores close to their mechanical resonant frequency. for more information refer to 3r1 material speci?cation in this data handbook.
1999 dec 23 2 philips components product speci?cation ferrite ring cores (toroids) tn23/14/7 properties of cores under power conditions 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 0.19 0.19 - 3f3 3 320 - 0.19 0.33 b ? b ? b ?
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