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WEBENCH® Tools/TPS54061: Output of TPS54061 is not stable

Part Number: TPS54061

Tool/software: WEBENCH® Design Tools

Hi Tis,

My ctm use TPS54061 as their buck DC/DC, Input is 12V ,output is 5V /200mA. At beginning provide 12V input, the Output is 5V,but it lasted a short time, it  went down to 0V。But when after a while, it could become normal output. the sch is as follow. Would you give some advice for the issue?