BQ25618EVM: BQ25618E充电问题

switch

Intellectual 845 points

Part Number: BQ25618EVM
Other Parts Discussed in Thread: BQ25618

Hi ti team，

我客户在使用BQ25618EVM测试时，遇到两个问题：

1，IC进入CV模式，充电电流在50mA时会有一个微小的突变，请问这是什么原因造成？

2，当电池电压在3.5V左右时，插入Vbus，充电电流会有短暂上下跳动（1S以内），请问这是什么原因造成？如下图

寄存器配置：

5 个月前

0 Star Xu 5 个月前

TI__Guru*** 130456 points

您好，正在询问更了解这款芯片的TI工程师，稍后回复。

0 Star Xu 5 个月前回复 Star Xu

TI__Guru*** 130456 points

您好，请参考下面内容

1. Please provide more background information for these observations. What was the input voltage and battery voltage, was there a system load, how repeatable is this, was this seen on other device etc? Was the device in DPM? Please check the status when this happens.

2.The root of the observation is the BATFET turns off between linear mode and switching mode. The charger gets out of this scenario because the average current is positive. Please lower your PCB trace impedance and battery impedance to fix this issue. If possible lower VSYS_MIN to reduce the transition time to switch from linear mode to switch mode.