Definition and Variation of the Saturation Current of Monolithic Inductors

2023-05-08 10:44

Definition of the Saturation Current for Monolithic Inductors Here, the saturation current refers to the current at which the inductance L decreases by 30% due to magnetic saturation; this current is determined under an applied DC bias. Relationship Between Saturation and Hs in Monolithic Inductors In the initial portion of the powdered‑material magnetization curve, the permeability μ remains relatively stable, and the inductance L varies only slightly with changes in the applied magnetic field strength. In the latter portion, however, the permeability μ increases significantly, causing the inductance L to vary more markedly with changes in the applied magnetic field strength.

Definition of the Saturation Current of a Monolithic Inductor

The current corresponding to a 30% reduction in the saturation-specific L here is the externally applied DC current.

Relationship between Saturation and Hs in Monolithic Inductors

In the first half of the powder material’s magnetization curve, the permeability remains relatively constant, and the inductance varies only slightly with the applied magnetic field strength.

In the latter half, the u‑value exhibits a more pronounced variation, and L varies significantly with the applied magnetic field strength.

For the same powder‑material system, Bs is a constant; Bs ≈ u·Hs is also a constant. The larger Hs is, the more the magnetic tape is stretched toward one side.

The smaller the slope (the smaller the change in the u-value), the higher the saturation.

Hast (fixed value) = LastN/Le

The larger Le is, the higher the saturation (L change rate) → Last↑ = Le↑ * Hast (constant) / N

The larger N is, the lower the saturation (rate of change of L) → Last↓ = Le × Hast (a constant) / N↑

The larger I is, the lower the saturation (L change rate) → L↓ = a↓ * u * Ae * N^2 / Le

Key characteristics of monolithic inductors

1. Low DC resistance and inductance value at this package size.

2. High saturation current

3. High strength and corrosion resistance

4. 100% lead-free, compliant with RoHS standards

 

 

Main applications of monolithic inductors

●DC/DC converters. ●Laptop, desktop, and server applications. ●Battery-powered devices. ●LCD displays, HDDs, DVCSs, DSCs, PDAs, and more.

●Pad, smartphone, Drive, smartwatch, smart glass

●Baseband power supply, amplifiers, power management, modular power supplies, camera power management

 

 

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