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bq24650指示灯闪烁代表什么意思?

用bq24650做太阳能收集与管理,MPPT电压设置为5.5V,太阳能电池板开路电压7V,锂电池充电电压4.2V。

正常充电时,STAT1亮,STAT2灭,与datasheet里描述的一样。但是,电池充电到4.05V时,STAT1便开始有规律的闪烁,STAT2灭,不再为电池充电了,这是什么问题?STAT1闪烁,STAT2灭,代表什么状态?

还有一个问题,我参考官方设计设计的电路板,元器件全部和官方设计的方案一样。我设置的最大充电电流为2A,但是锂电池电压在3.9V以下时,太阳能电池板输出在5.5V,350mA时,bq24650的充电电流只有300mA左右,效率明显不对。采用外接电源的方式测试,输入12V,5A,充电电流也只有450mA左右,请问可能那些原因导致了充电电流这么低?

Star Xu:

STAT1闪烁,STAT2关闭,看起来充电器在充电和故障状态之间进出
Please check the following
8.3.7 Enable and Disable Charging The following conditions have to be valid before charging is enabled:
• Charge is allowed (MPPSET > 175 mV)
• Device is not in undervoltage lockout (UVLO) mode and VCC is above the VCCLOWV threshold
• Device is not in SLEEP mode (that is, VCC > SRN)
• VCC voltage is lower than AC overvoltage threshold (VCC < VACOV)
• 30-ms delay is complete after initial power-up
• REGN LDO and VREF LDO voltages are at correct levels
• Thermal Shut (TSHUT) is not valid
• TS fault is not detected
One of the following conditions stops on-going charging:
• Charge is disabled (MPPSET < 75 mV)
• Adapter is removed, causing the device to enter VCCLOWV or SLEEP mode
• Adapter voltage is less than 100 mV above battery
• Adapter is over voltage
• REGN or VREF LDO voltage is not valid
• TSHUT IC temperature threshold is reached
• TS voltage goes out of range indicating the battery temperature is too hot or too cold

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