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LM5146: 参考设计中为什么上下桥NMOS选择了两款不一致的型号

Part Number: LM5146


LM5146  DCDC 同步降压参考设计中,上下MOS管为什么选用了两款不一致的型号呢,是有什么讲究吗?我看规格书,在电压电流都满足的情况下,差异比较明显的是内阻,Ciss和Qg,这样设计是为了增大死区时间吗?防止同时导通吗?