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LM5116: 输出24V时,VCCX引脚改怎么接?

Part Number: LM5116

我想用LM5116设计一个48V输入,24V输出,输出电流25A左右。因为电流大,上下管都用多个NMOS并联,如果使用内部7.4V的LDO驱动的话,驱动电流应该不够,但又不能直接接输出(电压大于VCC最大承受电压16V)。请问这种情况我是不是只能增加一个外部电源给到VCCX引脚?