I have made a 30W LED Driver with 30V o/p voltage. I have followed the design made by PI Expert. But snubber resistor dissipates much more power than its specified value in Excel sheet. While measuring the clamping voltage it's showing 110V, instead of 180V( as per calculation it should come 180V). Vor is 100V. I have connected the same R and C as per the suggestion.
Another thing is after designing the Drive, Rfb required is 280K where in design sheet it's 210K.Bias winding resistance is coming about 28V instead of 20V.
In my design,I have used 0.47uF as Peak detector Capacitor and hope that driver would sustain atleast 4KV surge. Is there any problem with this configuration? Should I include a TVS diode in parallel with the peak detector Capacitor? Please suggest what to do. Its very urgent