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LMZ23605拿给板厂贴装后大部分都损坏了

Other Parts Discussed in Thread: LMZ23605

20块板子贴了20个LMZ23605,拿回来调试板子时,发现只有两个LMZ23605能工作,其余坏了,部分LMZ23605输出管脚对地短路,部分输入输出管教都对地短路,还有的LMZ23605输出电压不对,测了FB引脚电压,不是0.8V,偏低在0.6~0.7之间。原先手工贴过LMZ23605  10个,都没问题。

请问这个LMZ23605机贴有什么特殊要求吗,该如何机贴啊?