SD12-220-R

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Fixed inductors are a common type of passive electrical component that store energy when the current passes through them. Fixed inductors come in all shapes and sizes, and are used in almost all electronic applications. The particular type of fixed inductor discussed here is the SD12-220-R.

The SD12-220-R is a ring core inductor that uses a ferrite as its core material, typically silicone. It is mainly used in DC/DC converters and recenters, and is popular in wide range of electronic devices due to its relatively small core size and high power. Its rated inductance is 12μH, and the max DC current is 4.5μH.

As the name indicates, the amount of inductance for a fixed inductor does not change with the current levels. Therefore, it stores the same amount of energy each time current is passed through the inductor. To explain the working principle of the SD12-220-R, let\'s use Faraday\'s law of induction. This law states that the voltage induced in any closed loop is proportional to the rate of change of flux linked to the circuit.

In the case of the SD12-220-R, when a current is applied to the loop, the ferrite core material of the inductor creates a magnetic field that induces a voltage. This change in voltage is opposite of the current and creates a back EMF that opposes the applied current. This back EMF is what stores the energy within the inductor and is also the reason why the inductor appears to have a fixed inductance.

The SD12-220-R is also designed with an air gap, which affects the inductance. The air gap reduces the inductance of the SD12-220-R, compared to fixed inductors without an air gap. This is because the air gap is insulated from the core and does not allow the magnetic flux to travel through it.

Fixed inductors are important components in many electronics, and the SD12-220-R is one of the more widely used types today. Its miniature size makes it versatile and allows for designs with small space constraints. The SD12-220-R has great performance in DC/DC converters and recenters, and its ability to store energy through the use of back EMF creates reliability in applications where current levels vary.

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