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TPS70933 发烫问题

Other Parts Discussed in Thread: TPS62177, TPS62170

您好!请问TPS70933资料上负载能达到150mA,但是我按照资料设计的电路,VIN=12V,CIN=1uF,COUT=2.2uF,VEN=3V,VOUT=3.3V;负载是24欧姆的电阻时,芯片发烫厉害,而且电压也在2.6V和3.4V之间不停的变动,请问是什么原因啊?