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tps63060 带载电压不正常

Other Parts Discussed in Thread: TPS63060

各位好,我用的是tps63060的芯片,输入5v,输出5v,空载的时候输出电压正常,加上负载之后电压下降到4.1v,只有输入电压大于5.7v之后才能正常得到5v,电流也不到400mA,我附上电路图,和pcb,大家帮我看看。