At 350V dc voltage, Viper16  output is toggle for 2 s to 0V.  What could be problem? ..... Output req 24V @ 250mA and Input 200V to 350V DC. 

Hello everyone,I am using Stm32 controller for motor control and heating control. Universal motor is connected to TRIAC and TRIAC connected to MOC2023. LED of opto coupler is control by GPIO. Now problem is after erasing code from Flash memory , GPIO...