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Hi
在这些芯片的datasheet里面热阻底下的说明中给出一些文档和工具能帮到你：
http://www.ti.com/lit/an/spra953c/spra953c.pdf
http://www.ti.com/adc/docs/midlevel.tsp?contentId=76735&DCMP=hpa_design_center&HQS=Tools+OT+pcbthermalcalc
