DC Bias Characteristics of Inductors and MLCCs

What Is the DC Bias Characteristic of an Inductor for Power Circuits?

When DC bias current is applied to an inductor, magnetic permeability decreases as the magnetic material approaches magnetic saturation, which reduces inductance. This is referred to as the DC bias characteristic.

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What is the DC Bias Effect on MLCCs?

Advances in MLCCs (Multilayer Ceramic Chip Capacitors) have allowed manufacturers to achieve very high nominal capacitances. However, they still suffer from from some drawbacks, including a loss of capacitance with increased bias voltage. This video details the “DC-Bias” effect on class two MLCCs:

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Content and images provided courtesy of TDK’s FAQ: