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Magnetic chokes are key for a successful filter design and the filter attenuation characteristics must be matched with the EMI source. The variable noise spectrum requires two paths: Common mode and differential mode. The magnetic material makes it possible to achieve the desired attenuation characteristic.
Amorphous and nanocrystalline materials have the highest permeability, with permeability decreasing gradually as frequency increases. They both have lower electrical resistivity, and therefore less stable permeability characteristics.
Mn-Zn ferrite permeability drops sharply at a frequency of about 200 kHz. The electrical resistivity is lower, and the permeability characteristics therefore also lower.
Key Properties:
● High saturation magnetic induction (Bs=1.56T)
● Low core loss compared to other core materials
● Good frequency and temperature characteristics,usable to 3000KHz
● Good DC Bias characteristics
● Low leakage flux
● Size saving and lighter weight, compared to others
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