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BQ24600: BQ24600 充电时电感啸叫

Part Number: BQ24600

请问BQ24600在给电池充电时,为何电感会出现啸叫?(设计参数为:输入电压为:19.8V/3.4A,充电电压:4串电池(16.8V,充电电流为:2A)原理图设计如下;