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TPS54331空载时输出异常

Other Parts Discussed in Thread: TPS54331, TPS61220

如下图TPS54331线路,输入电压低于6.6V时,空载时输出电压为三角波,电感有持续“哒哒”声;带载后正常。空载时输入电流为0.259A。

请问如何使空载时电压正常,避免电感发出响声?