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请教,锂电池包欠压保护方案

Other Parts Discussed in Thread: BQ76920

锂电池包带2个PIN脚,代表电源的正极和地。

容量为20V,3Ah,正常输出20V直流电。

请问,如何在该电池包外部设计欠压保护,防止电池过放电导致损坏?看了下TI的bq76920等器件,发现都是为小电压电芯串联的保护IC,没有直接接20V的保护IC。

多谢回答!!!