Hi
I am designing a boost converter for my college final year project .The boost converter would take input of 12 volts and give variable outputs from 20 volts to 60 volts.The design is a bit ready the only problem i am facing is regarding the pwm controller. I tried to design the pwm using the 555 ic but the problem is that when i am trying to change the duty cycle the frequency is also getting changed. MAX038 and ICL8038 was the other two alternatives available but both the are now not in production can you please tell me some other way to design the pwm controller that would have independent frequency and duty cycle control in it or only a fixed frequency but variable duty cycle control in it.
My maximum frequency requirement will be near about 30 khz and an adjustable duty cycle from 2% to 98%.
I am designing a boost converter for my college final year project .The boost converter would take input of 12 volts and give variable outputs from 20 volts to 60 volts.The design is a bit ready the only problem i am facing is regarding the pwm controller. I tried to design the pwm using the 555 ic but the problem is that when i am trying to change the duty cycle the frequency is also getting changed. MAX038 and ICL8038 was the other two alternatives available but both the are now not in production can you please tell me some other way to design the pwm controller that would have independent frequency and duty cycle control in it or only a fixed frequency but variable duty cycle control in it.
My maximum frequency requirement will be near about 30 khz and an adjustable duty cycle from 2% to 98%.