When PCB is used in magnetic environment, the output of LMZ10505 will be changed from 3.3V into 4.3V at power up sometimes.
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When PCB is used in magnetic environment, the output of LMZ10505 will be changed from 3.3V into 4.3V at power up sometimes.
Hi
有没有波形?
如果是恒定输出的话一般不是干扰。
有没有单独测试电源芯片(其他电路都不工作,额外带负载,以此排除其他电路的干扰)?
在上电期间,LMZ10505在5V输入3.3V输出时的异常波形
Hi
有没有更换芯片确认? 从你之前的描述看起来是干扰,但是从波形看像是FB异常。
Hi
我的意思是更换芯片后会正常吗?
芯片内的参数无法改变的。输出在3.3V后再升高到4.3V,如果仅仅电源芯片工作(排除外部干扰)后是否依旧异常? 芯片关掉后再启动是否重复3.3V到4.3V的异常?