I want to use PWM for boost converter. I already have a switching signal with duty cycle 50%. From this signal, how can I generate PWM signal to control ON/OFF of switch? I don't want to use microcontroller. I want to design myself for all this.

 

You could use the signal to trigger a monostable circuit having a variable pulse width.

 

Thanks. Could you provide the circuit so I can study on?

 

Do you want a pwm circuit to control a motor or fan, say using a 555 timer...

https://www.google.co.uk/search?q=5...AUIBygB&biw=360&bih=511#imgrc=Qguu5dVhiXqx9M:

Or something different?

 

Do you want a pwm circuit to control a motor or fan, say using a 555 timer...

https://www.google.co.uk/search?q=555+pwm+circuit&prmd=imvn&source=lnms&tbm=isch&sa=X&ved=0ahUKEwjf8r-3kafLAhXJNpoKHcWsDsAQ_AUIBygB&biw=360&bih=511#imgrc=Qguu5dVhiXqx9M:

Or something different?

No, I use it to control ON/OFF of two switches in boost converter.

 

So you have a pwm signal already generated, and want to use it in your boost converter?

 

So you have a pwm signal already generated, and want to use it in your boost converter?

I already a switching signal with duty cycle 50%. However, I am thinking about how to modulate or ajust pulse width this signal to control boost converter.

 

Well to adjust it, you need to show the circuit of the pwm generator,then we can help you further.

 

Could you provide the circuit so I can study on?

Here's one possibility. The graph shows the output variation in response to a 0V to 5V sweep on the Control input.