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Application and selection of ferrite absorbing materials

Author:admin   AddTime:2021-07-08

Application and selection of ferrite absorbing materials

Ferrite suppression component size selection: After selecting the material, generally speaking, the larger the ferrite volume, the better the suppression effect. When the volume is constant, the long and thin shape has greater resistance than the short and thick shape, and the suppression effect is better. The larger the cross-sectional area of the ferrite, the less likely it is to saturate and the greater the bias current it can withstand. The smaller the inner diameter of the ferrite, the better the suppression effect.




Application of ferrite suppression components on circuit boards:

The EMI on the circuit board mainly comes from the digital circuit of the periodic switch, and its high-frequency current produces a common-mode voltage drop between the power line and the ground line, causing common-mode interference. In order to suppress this interference, we add a decoupling capacitor between the power line and the ground wire to short-circuit the high-frequency noise, but the decoupling capacitor usually causes high-frequency resonance and generates new interference. For this reason, it is necessary to add ferrite absorbing material suppression components to the I/O ports on the circuit board to effectively attenuate high-frequency noise.

ferrite sheets:https://www.goodsmaterial.com/

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