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TPS7A4701-EP: TPS7A4701 USING PROBLEMS

Part Number: TPS7A4701-EP

Hi ,

 One of my customer met the problems when using the TPS7A4701, and the problem shows as follow:

Vin 12V,  Ven=2.4V,they want use the feedback resistors to get the Vout =7V, and the R14=50K, but there is no output signal!! Here is their design schematic ,Pls help check and find out the problem!

thanks a lot!