We are doing 65W ,5V output flyback for universal input range . The switching frequency is 65kHZ, transfomer ratio 6.4:1 ,Inductance is 92uH.
For calculations of resistors i have used the UCC24630 design tool.Attached the Xl sheet but with these values driver output is getting off when input voltage is increased form 120V DC to 130 DC Then i changed the R16=2.2K and R15= 82K, R17=193K, R18=33K, the blanking time resistor i varied from 4.7 to 50K i think Once the primary pulse is <1uS the driver output is getting disabled.
Is it the primary pulse width is becoming too small ? How can we use UCC24630 for this application.
Copy of UCC24630_Calc.xlsx. whether this controller is suitable for this application ?
