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BQ25570从备用电池启动问题

Other Parts Discussed in Thread: BQ25570

在使用BQ25570时发现:输入不接太能能,用备用电池(Vb)直接供电时,BQ25570不能正常输出,必须要太阳能接上启动一下才可以,启动之后太阳能再拔掉也可以正常工作。是电路的问题吗?还是芯片本身就是这样设计的?