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没有哪个脚损坏,是芯片有最大占空比限制功能,根据外围参数计算,最大占空比能到72%, 但是实际只能到66.4%(好的芯片能到70%) 导致输出电压偏低。不良率比较高,而且有些批次性比较严重,我们又无法筛选,如:DC:2244(SMT),不良数量:19pcs,不良率:19/858=2.21%, 所以发给TI 分析。谢谢!