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电源芯片tps61085问题

Other Parts Discussed in Thread: TPS61085

我用的tps61085芯片进行的升压,理论值是升压后是400ma,9v,实际是,空载时的输出可以达到9v,但接入电阻时电流就只有5v左右。电流也只有10ma。这是为什么?