A bootstrap capacitor is a specialized capacitor used in gate driver circuits to provide temporary high-side voltage for MOSFET/IGBT switching.
A bootstrap capacitor is an essential component in half-bridge or full-bridge gate driver circuits, typically connected between the high-side driver supply and the switching node. It stores charge when the low-side switch is on, then provides isolated voltage to power the high-side driver when the high-side switch needs to be activated, enabling efficient switching of power semiconductors without requiring isolated power supplies.
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If the bootstrap capacitor is too small, it may not store enough charge to properly turn on the high-side switch, leading to incomplete switching, increased switching losses, and potential device failure.
Electrolytic capacitors can be used in low-frequency applications, but ceramic capacitors are preferred for most applications due to their lower ESR, better high-frequency performance, and longer lifespan.
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