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Output voltage dip using LMZ12001

Other Parts Discussed in Thread: LMZ12001

Hi,

I am using LMZ12001 to convert input DC 12V into 3.3V,  The design follows datasheet typical design.  However, I found a problem.  When converter runs a while without load or with full load,  the ouput voltage dips to 2.8v or other value, then comes back to 3.3v, then dips again.  

when output voltage dips,  the voltage on FB pin also dips.  It happened some times.  it works very well today, but tomorrow, the dip problem happened again.  

do anyone encounter such problem before?  who can help me ?  thank you very much.