Tool/software:
The application note from the datasheet was used for design, following the calculations, a circuit was designed for a 69V, 660mA LED matrix, with a power supply of 85-135Vac, with a switching frequency of 350kHz, however the circuit presents a huge instability , as can be seen in the images, it does not maintain the nominal load current starting at 590mA and after less than 3min dropping to less than 290mA, presenting an audible noise in the inductor
Image 1: circuit
Image 2: Gate
Image 3: Coff
Image 4: Isns
