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关于电源IC温度问题



大神 请教几个问题  

1、Junction temperature,这个结温是指IC塑封表面温度?还是指IC wafer的温度?

2、RθJA Junction-to-ambient thermal resistance、RθJB Junction-to-board thermal resistance、RθJC(top) Junction-to-case (top) thermal resistance这个三个值,如果我大概估算IC表面温度一般选哪个来计算(假设IC功耗1W?)