I am using LYT4227 IC to for my 36W Driver. I have made some of changes to work with indian power supply conditions.
My Driver Configuration are below.
Input Voltage : 180-300VAC (also can handle 450VAC without blowing fuse)
Output Voltage : 75V 440mA 33W
Efficiency : 87.5%
PF : 0.98
I have added following components to work with high input voltage(450VAC).
- 3mH Drum Core after Bridge Rectifier
- 5uF 900V Capacitor (2 x 10uF 400V) instead of 2.2uF 450V
- Added 600V(2 x 1.5KE300A) zener protection across IC (Drain-Source Pin).
- Also tested by giving two phase and 440VAC to Driver
I have measured temperature across P6KE200A and various parts none of them found suspicious.
Sometime P6KE200A(clamp diode across transformer primary winding) failed and start heating up. After some time it blows.
Is there any way I can stop blowing this clamp diode.
I have attached my circuit diagram.