Hi Everyone,

I would like to design a flyback converter with uc3843. But I quite don't understand what the COMP pin is used for and how to set it correctly. I am totally new on power electronics. Can anybody explain in a dummy way so I can learn it.

Best regards

 

hi my,
Check this link.
E
https://components101.com/ics/uc3843-pwm-controller-pinout-equivalent-datasheet

 

hi my,
Why have you deleted the question while I was typing a response.?

Read page #9 of the PDF it explains the Compensation pin #1
E

 

hi my,
Why have you deleted the question while I was typing a response.?

Read page #9 of the PDF it explains the Compensation pin #1
E

Hi Eric,

Sorry my question was shortly : why do we need another compensation network for comp pin while we already design for the feedback loop? Additionally, how can the resistor and capacitor value be calculated ?

Thanks for your reply.

 

Have a look at this.
https://www.ti.com/seclit/ml/slup340/slup340.pdf

 

The purpose of the compensation pin is to modify the shape of the closed loop response to improve stability. In a typical case it accomplishes this by introducing phase lead. Calculating the component values requires knowledge of the closed loop response without the compensation.