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BQ24610六串锂电池充电时频率下降到300K

Other Parts Discussed in Thread: BQ24610

Bq24610冲六串锂电池,电池电压设置25.2V 输入电压26.2V 充电电流1.5A 截止电流0.15A,电感6.8uH 电容20uF

电池充电电流降到1.3A时,能听见明显的电感嘶嘶声,而且开关节点PWM频率由正常时620K下降到300K左右。请问有人遇到过没?

再有,同样一块电路,设置给三串锂电池充电时整个周期很正常,未发现此故障。