L4984D CCM PFC Controller

[Trotila]

Hello guys

  I am working on a switch mode power supply with PFC  and for the latter I have picked L4984D IC. 

 The reference circuit design I obtained with the help of eDesignSuite online tool.

   

Upon assembly of the circuit, as a safety measure , I powered it through a series bulb and straight away, things did not look promising. there were no shorts, but the voltage at the INV pin measured at 0.7v , which according to the datasheet ,told me that there was a feedback failure. After inspecting all the feedback resistors and double checking the circuit, I discovered that VCC voltage was dropping below VCCON. rectified it and then Series Bulb light up brighter than before and had a pulsating visuals( not completely dimming). did more checking and found out that the main bulk voltage was dropping to 110V , which is far too low and now the only suspect seemed to be the series bulb. before bypassing it, I did one final measurements to make sure it was safe to directly turn the circuit and then I proceeded to giving it the line voltage. as a result I got the IC blown, as well as the current sense resistor and switching MOSFETs . the trace to the MULT pin got completely evaporated. have been scratching my head, what could have gone wrong. The eDesignSuite suggested  STP65N045M9 MOSFETs , I could not source them and picked replacements as close to them as possible, GBS65060TOB MOSFETs. i have attached both eDesignSuite picture as well as my replicated circuit.

Please take a look if you may. Maybe i have made an error, maybe you will advise me on some thing. i would greatly appreciate it.

Thank you in advance

Saba