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LM5175 电感发热 ,CCM DCM如何选择?

您好!我电路输入20(电池)到28V输入,输出24V,设计输出电流要达到9A,只是偶尔需要这么大电流(电机启动时)。昨天刚调试,发现在空载时,电感发热,这个是怎么回事? 另外CCM DCM模式如何选择?我现在是MODE脚接93.1K电阻到地。