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咨询LMZ10503相关问题

Other Parts Discussed in Thread: LMZ10503

LMZ10503配置模式为Vin=3.3V,Vout=1.8V。断电测试Vout对地电阻300多欧姆。

上电测试,输出电压不正常,Vout=0.7V,输入电压正常为3.3V。接法见附件,Css接33nF电容。

测试Css管脚电压为0V,EN管脚为1.4V。

在另外一块很相似的板卡上,采用同样的电路,电压输出正常,测得Css=1.6V,EN=1.4V。

由以上条件能否判断出第一块板卡LMZ10503芯片的好坏?

谢谢