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BQ20Z45问题再提问

Other Parts Discussed in Thread: BQMTESTER, BQ20Z45

1.电池2串应用中,如果电池组电压低于7V时进行2A电流校准,会发现校准过程中MOS管发烫,如果电池组电压大于8.2V时2A电流校准则不会出现发烫的现象,请问是什么原因造成的?