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BQ24610: 按手册参考电路为什么未接电池时还是有电压跳变

Part Number: BQ24610

   输入电压24V设置充电电压21.2V电流0.97A,上电未接电池时STAT1指示灯闪烁对应电压跳变,不应该没有电压输出吗?接上电池后充电电压也有很大的波动如图3。