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BQ24610充电问题

Other Parts Discussed in Thread: BQ24610

我用BQ24610制作了一个充电板,长接电源。输入9V挂两节18650(8.4V)。电流500mA。

9V上电后(不接电池负载),RGEN=3.67V   vref=3.3V 此时电流为18mA左右  此时接上电池能充电 ,接上电池后REGN 为6V。

但是我先接上电池(8.22V),在接电源9V 此时VREF=0V 感觉芯片没启动。电流也是0A   请帮忙分析下问题可能出在哪里。谢谢!