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BQ24170充电电路的PWM问题

Other Parts Discussed in Thread: BQ24170

调试了好几块电路板,都出现相似的问题,i电池充电几分钟后,BQ24170就烧坏了。

表现有两种:

1、sw信号和PGND导通了

2、sw信号输出为固定13.8v电压,充电输入电压为15v

哪位能帮着分析一下,是什么问题

ps:电路时参考datasheet搭的