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TPS54335A: TPS54335A have no output

Part Number: TPS54335A

Hi  

      We use TPS54335A  for system  step down,input 12V /3A , output 10.5V/1A . different batches of production, Some works good, some no output.  If  the output is 9V ,the all  works good, how to solve this problem?  Thaks a lot !