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bq24650指示灯闪烁代表什么意思？

ZhangGQ
Prodigy 30 points
Other Parts Discussed in Thread: BQ24650

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？

  • 0
    TI__Guru*** 130456 points
    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