Plain-language answer: Ferrite saturation occurs when magnetic flux in a core approaches the material limit and incremental permeability collapses.
Why the real component differs from the ideal
The transformer or choke can lose inductance, distort waveforms, heat quickly, and stop presenting the intended impedance even below a published thermal limit.
What to verify
Use the specified mix, core area, turns, frequency, power, load, and duty cycle; stop for rapid heating or changed behavior.
The common mistake
Assuming a physically large ferrite core cannot saturate.
Component boundary
Use frequency-specific ratings and the exact topology, material, geometry, load, power, duty cycle, and cooling. Begin at low power and stop for heating, odor, arcing, distortion, or unstable measurements.
