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STM32F103 Supply Problem

Question asked by on Jan 12, 2016
Latest reply on Jan 13, 2016 by wolff.roger
First of all sorry for bad English.
I had designed a PCB for STM32F103 micro-controller for my specific job. The thing is micro-controller works fine when J-link is connected. J-link programmed micro with no error and software runs fine but when i switch the supply with my own 3.3v source and remove J-link, the micro wont start at all . I suspected my power supply which is LM2576-3.3 and tried another sources but micro wont work with any external voltage source with 3.3V. the strange thing is micro work with any external supply with 2.5V output. In datasheet says micro will work with supply voltage 2 to 3.6 but sadly in my PCB micro works with 2.5. Am I missing something? I would appreciate any help.
 I attached my schematic too.