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Offline fly back converter design using NCP1250

Balaji1998

Apr 18, 2023
3
Joined
Apr 18, 2023
Messages
3
I used NCP1250 for my Fly-back converter design, similar like this when in without load its turning on and when I connect 1.2A load its going to hiccup mode (Designed for 2A). Even I used less load then recommended. Then the next time when I am powering on VCC voltage maintains 5V and switching not happening(its latched). also I connected OPP pin to ground.

is there any fault?
 

Balaji1998

Apr 18, 2023
3
Joined
Apr 18, 2023
Messages
3
Oh sorry i forgot to upload schematic
 

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