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LMR64010效率问题

Other Parts Discussed in Thread: TPS61251

5V输入并通过调节输出6.5V,测量的输入电流为198mA,输出电流为88mA。通过计算可以得出效率为0.088*6.5/(0.198*5)=0.578,这个效率是不是太低了,按照芯片手册的曲线图,起码效率应该在0.8以上,小弟对于这个问题感到很疑惑,求助各位大神!