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When the capacitance of a bootstrap capacitor is too large, depending on the performance of the internal power supply, the rise of the boot voltage is delayed. Why does this occur?
The boot voltage is determined by the amount of electric charge flowing into the capacitor. Hence when ability of the internal power supply to provide current is limited, the increase of the boot voltage is slowed. It is recommended that a value close to the recommended value of the data sheet be used.