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TPS61020 IC损坏

Other Parts Discussed in Thread: TPS61020

TPS61020 在生产PCM测试时没有发现问题,但在半成品组装接上电芯后测试PCM板发烫,经测试发现TPS61020 的VIN脚对地短路或者阻抗在100欧以内,出现这种现象的原因可能是什么?急盼解决