BQ24295充电电流仅为0.5A

各位专家好：

现在我们在使用BQ24295过程中，发现电池的充电电流最大仅为0.5A左右，使用的电源适配器为3A输出的，电池为3节并联的18650电芯，寄存器从0x00到0x0a读出值依次为：5F 3B 9C F1 B2 8A 93 4B AC 00 C0

请问出现这个问题可能的原因有哪些？

电路图如下：

Star Xu：

even though your charger can provide up to 3A, it is possible that a lot of line impedance can push the voltage as seen by the charger on VBUS, to the VINDPM threshold. The default/standalone value for VINDPM is 4.76V, so it would only take 360mV of drop on the VBUS line to cause this. If the input current is ~360mA, we're talking about 1 Ohm of resistance. Did you measure VIN at your adapter or directly on the VBUS pin of the charger?

Johnsin Tao：

回复 Star Xu:

Hi确认一下输入电流限制和充电电流设置都没有问题？

user5266478：

回复 Star Xu:

hello：

thank you for the reply。

I measured the VIN on the decoupling capacitor, it's 4.95V . and i changed the reg 00 to 1f,to set a lower VINDPM, but the current still is 0.52A, as i measured.

user5266478：

回复 Johnsin Tao:

您好：
输入电流限制和充电电流设置都是设置的3A，ILIM引脚现在是直接短路到GND的。