Ferrite for Telecommunication
Low THD Materials for xDSL Modem Transformers DN70
The use of xDSL technique becomes wide spread as a high broad-band access to the internet. In order to utilize such network access as sufficient as possible, low THD (Total Harmonic Distortion) of transformer for xDSL modem is quite important to transfer the significant signals. Materials DN70, TDK achieved such requirements recently, are developed to meet low THD over a wide temperature range(0 to 85°C) and wide frequency range( 5kHz). Therefore, They are suitable for the high performance transformer design for xDSL modem applications.
Standardization of A
- Meet low THD over a wide temperature range(0 to 85°C) and wide frequency range ( 5kHz).
- DN70 materials are best suited to high-performance transformers for xDSL modems.
- Selecting an appropriate core for transformer design is made easy by standardization of the Al value in cores that have practical shapes ( EP cores )
- Transformer for xDSL modem
|EP||EP7||40, 63, 100, 160, 250|
|EP10||40, 63, 100, 160, 250|
|EP13||63, 100, 160, 250, 400, 500|
|Initial permeability||µi||25°C||7500 ±25%|
|Relative loss factor [10kHz]||tanδ/µi||25°C||<2.0|
|Temperature factor of intial permeability||αµir||-30 to +70°C||-0.5 to +1.5|
|Saturation magnetic flux density [1000A/m]||Bs (mT)||25°C||390|
|Hysteresis material constant [25°C, 1.5 to 3.0 mT, 10kHz]||10-6 / mT||<0.2|
Graph of THD and Permeability versus Temperature
Ferrites For LAN Pulse Transformers DNW45
Toroidal Cores T Series
TDK toroidal cores find use in many kinds of device—pulse transformers, delay lines, R. F. coils, converter transformers, wideband transformers, impedance—matching transformers and the like. The variety of TDK materials, of which the TDK cores are made, provides a truly wide range of cores for the user’s selection. The core meeting user’s requirement for duty anywhere between the audio range and about 20MHz will be readily found in the TDK toroidal core line.
LAN pulse transformers
|Type (ø A× C× øB)||Dimensions in mm||Parameters|
|T3.05 x 1.27A||3.05±0.2||1.27±0.2||1.27±0.2||5.65||1.06||5.99|
|T3.05 x 2.54A||3.05±0.2||1.27±0.2||2.54±0.2||2.82||2.12||5.99|
|T3.4 x 1.5B||3.40±0.2||1.70±0.2||1.50±0.2||6.04||1.23||7.40|
|T3.4 x 2.5B||3.40±0.2||1.70±0.2||2.50±0.2||3.63||2.04||7.40|
|T3.94 x 1.27C||3.94±0.2||1.78±0.2||1.27±0.2||6.23||1.30||8.10|