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TPS54360: BOOT-SW的自举电容电压问题

Part Number: TPS54360

自举电容是给高侧MOS管提供启动电压。在仿真和实测中BOOT-SW端口电压一直是6V左右,而在数据手册中BOOT-SW电压会有3V的曲线,请问自举电容两端电压是由什么决定的?输出电流吗?并且在什么情况下自举电容电压会降到3V,是只有3V还是一个变化值。