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tps61070使用时的电流太低问题

Other Parts Discussed in Thread: TPS61070

我按照tps61070的典型接法,然后接负载测试,比如输入1.2V,输出3.6V,手册上说可以达到400MA但是我测试只能达到60MA就电压降了,根本达不到大电流输出,请问这是为什么?

我R1接的是1兆R2是电位器。