Hello,
I have been working on a PSFB converter , my controller is UCC28950 and there is MCU in my system but it will just read ADC datas and write some digital signal for ON/OFF the IC and this will be a battery charger that is working with CC/CV charge so the regulated max. output current is 60A in CC mode and I am analyzing the circuit only this mode for now. The 60A is regulated , I have a shunt resistor at output and a current sense opamp INA241A4IDDFR and there is error amplifier outside of controller that is generating PWM according to reference level for output current loop and I need to change the output level before the circuit works because user can prefer lower charge current ad I have two options , first one is adjusting reference voltage that is in error amplifier , the other one is adjust the feedback current gain .
Schematics are below and which one is better solution ? I cant find a way to solve this probelm , please help me


and also are buffer op-amps necessary to stable the voltage level ? and Do they get slower the response time if I use them in current feedback path ?

 

i guess https://www.ti.com/lit/ds/symlink/ucc28950.pdf#page=36 is best starting point for decoding the rest of the document which is most likely insufficient for achieving a ! valid operational bug free product !

(also the mosfet properties are important) = ? what is your output specs (the desired median- & peak power range) ?

 

Vo = 60V is fixed , Max. output current is 60A . Other charging current options will be 50A and 45A . and I couldnt see anything about the topic in UCC28950 datasheet and appliction information

 

If you change your feedback loop gain, their phase/gain margins may be exceeded under certain conditions and the device may oscillate. Unless you compensate for the worst case scenario.
Loop compensation is not a trivial matter, and I would say that most if not all of the DIY SMPS supplies won’t have it optimized, to use a charitable description.
Therefore I believe it is better to adjust the reference voltage, and leave the loop gain always fixed.