Core Material comparison of Planar Inductor

We usually use MnZn ferrite core to design planar inductor, but for larger inductance and high current inductor, we may face two realistic issues.

i>Ultra high current, as temperature rised, MnZn Ferrite core is easy to be magnetic saturation.

ii>The OCL will be unstable when MnZn Ferrite core need to be having multi gaps. That will be lead many uncontrolled issues when this product introduces to mass production. 

Why choose Al-Si-Fe Alloy core?

I The magnetic flux density of Al-Si-Fe Alloy is much larger than that of MnZn ferrite, which is twice the magnetic flux density of MnZn ferrite. Secondly, the energy stored in the Al-Si-Fe Alloy core is much higher than that in the MnZn ferrite core.

II Under high temperature conditions, the full flux density of Al-Si-Fe Alloy will not decrease, but the full flux density of MnZn ferrite will decrease significantly.

III Al-Si-Fe Alloy has soft and full characteristics, can withstand the current value is higher. If the safe current value is exceeded, the function of the inductor will not be greatly affected.

So it is mainly used in some relatively large current products, such as some relatively large power supply. Because of its current higher, when other inductors can not solve this problem, Al-Si-Fe Alloy will be used to solve this problem.