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LMZ14203: Vout输出大于理论最大值5.3V ,达到5.5V,对后级LDO造成隐患

Part Number: LMZ14203

客户LMZ14203已经批量,以前生产的都是Vout=5V±0.3V。近期批次出现Vout=5V超过理论误差范围,测试为Vout=5.5V以上。

分压电阻采用的都是1%精度的,100ppm的温升的,室温测试,没有长时间通电。

1、下图为批量原理图

2、下图为万用表测试输出电压5.5V

3、下图为示波器输出波形Vout=5V

下图为5V纹波

4、下图为PIN-6脚FB直流波形

5、下图为PIN-6脚FB电压