I am going to make 20W (31.2V, 600mA) Isolated LED Driver. But My Clamp Dioded is overheating and after some time LNK419 blows up.
I have attached my basic circuit design as image file.
I have done following things to solve this issue
1) Used three different Transformers but failed. (RM8, EE25, EE30)
2) Changed Bias Resigter R3 (10ohms to 255 ohms)
3) Chaged Bias Diode D4 (1N4148, ES2D, 1N4935)
4) Changed D3 Diode (UF4007, ES2D)
Tell me all possible reasons for overheating of Clamp Zener Diode.