I have implemented circuit of AN-1937 LM3433 10A to 40A LED Driver Evaluation Board with PIC24 in 3.3 supply mode but there is some audible noise from MOSFET (might be some switching noise) & MOSFET's are getting heated. Even i am not getting expected light output on CBT 140. When i have disconnected load the LM3433 gets burned. Please provide me any solution.