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使用TPS61500,无法到达要求的13V.0.35A,供电电源为3.7V锂电池

Other Parts Discussed in Thread: TPS61500

我在使用时,电源为3.7V锂电池,设置的是350mA的电流,输出端接一个3.3V的LED可以输出3百多电流,但是再串联一个LED,电流就降了一百mA,,再串联一个LED,还能点亮,但是输出电流又小了,这个的原因可能是什么?