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BQ76930: 芯片采样回路异常及芯片发热

Part Number: BQ76930
Other Parts Discussed in Thread: BQ78350, BQ76200,

7串电池组,用BQ76930+BQ78350+BQ76200方案,在组装时会出现2个现象:

1)BQ76930最第一串采样回路异常,即最低1串耗电明显偏大,测试采样回路电阻200Ω左右,相当于芯片管脚短路,经查焊接质量良好,无虚焊及连锡情况。

2)保护板与电池组连接后,BQ76930明显发热,2.5v输出电压1.3V左右,测试2.5V对GND阻抗30Ω。

3)两种异常合计约5%不良。