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Which failure results when a voltage spike causes dielectric breakdown in a capacitor within a SMPS?

A)Oscillatory ringing in switching frequency
B)Capacitance value shifts to negative
C)Increased equivalent series resistance
D)Capacitor exhibits lower self-inductance

💡 Explanation

An overvoltage leads to dielectric breakdown, causing a degradation of the insulating layer’s properties which manifests as dramatically increased equivalent series resistance, because the leakage current increases; therefore ESR rises rather than oscillatory changes or a negatively shifted capacitance.

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