Hi:
产品接入适配器(输入电压12V),负载端断开,仅为电池端充电,当电池充满时,管脚STAT输出高电平。此时拔下适配器再插上时,STAT管脚出现异常,波形如下图所示
SW节点处的波形如下图所示,工作频率与设置的1.5MHz相差甚远,并且能听到电感啸叫声
为什么STAT管脚会异常?直接接LED作为充电状态指示会造成充电状态的不确定性,部分电路设计如下图所示
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