BQ24780S: BQ24780SRUYR不充电

你好，

     BQ24780SRUYR这款IC在设计调试阶段发现不充电，请帮忙协助分析一下不充电的原因，谢谢！

测试如下：

电池15.3V，充电电源20V

PIN4 25.5V

PIN5 3.3V

PIN6 在2.8V

V_SYS 20V，说明前端2个MOS管都导通了

PIN26 15.3V，PIN27为15.3V（示波器测试的），这里似乎应该是电荷泵开关，电感储能给电池充电，实际是直流（电池电压）

PIN18 15.3V

R4，C15，C16端 15.3V（电池电压），R4右边接电池正极

Links：

您好，

下面的两个链接与您的这个问题比较相似，请参考

https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/827499/bq24780s-bq24780s-can-not-charge

https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/941778/bq24780s-can-not-charge

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,

Xu Allen：

      你好，这个链接没有获得解决方案。以下疑惑能否帮忙解答一下，谢谢！

1、是否能简单描述下芯片充电时的后端电路上下桥，即LODRV与HIDRV的工作逻辑（控制上下桥N-MOS），及影响他们开关的因素；在充电的绢充、恒流、恒压阶段的逻辑。这部分后端没有打开，是什么原因引起？

2、充电电流的设置，现是参考ILIM端设计，从外部3.3V分压0.717V到此PIN，Rs为10mR。如果DC端，电压19—24V，假定设置输入电流不足，是否会导致不充电？是软件还是硬件哪部分造成，怎么解决？

3、现是4节3.7V串联，即电池电压要调在范围13.2—16.8V。输出端V-BAT电压范围值的软硬件设计关联部分有哪些？

,

Links：

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Czech
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Danish
Japanese
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Dutch
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Estonian
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