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junctin to ambient的热阻



Hi

   请问, TI内部是否有提供电源芯片(主要是LDO/DC/DC芯片)热阻与PCB 散热GND面积的测试报告?

    原因是很多datasheet上都会提供junctin to ambient的热阻,但是都没有说明这个热阻要求PCB上对应散热的GND面积(与PowerPad相连).