TNY290 Design - SMPS Resets above 200 Vac
Please Find my schematic. I have designed SMPS based on TNY290 Ic. I have populated 2 boards. Now one board (BOARD - A) is working fine but another board (BOARD - B) keeps resetting after I increase the input voltage above 200 Vac. On Board-B I have checked all the components & also replaced IC and transformer but it only works in the range of (70 - 200 Vac) after that it automatically resets itself!
From where should I debug the board? should I change the values of the resistors of overvoltage protection? (But it still works on the BOARD - A )
Note: Test condition - SMPS Output power consumption is 6 watts. (Cant change the load settings as this board is part of (power supply) larger circuit.