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LMR14020: LMR14020电源芯片输出不能带负载

Part Number: LMR14020


1-我这个电路所有参数都是按照手册来定的,但是做好之后输出他就不能带载,本来不带载时输出5V,只要上负载电压就被拉下。电流输出最大在200ma左右。

2-因为电源芯片是从北京的经销商发的,发现芯片丝印有点模糊,不知道是不是芯片是冒牌货。