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关于LP2951散热的Tj测量

Other Parts Discussed in Thread: LP2951

关于LP2951散热,大部分应该是从底层铜箔散热,我们在评估Tj的时候,有两种办法:不知道哪种更合理?

 

1.测量Top case的温升,假设40%的功耗由TOP散热来计算的,这样计算Rthja=Rthjc+Rthca,再算出Tj,结果是173Cfail

2.测试Bot case(测量靠近Bottom case的铜箔温度),用热阻RQJC计算,暂时我们还未按这种办法测试

下面是我们测试Top case的温度数据:

是否有其他的最准确的测量方法去计算Tj?