Hi again, I like to continue the discussion regarding opto-couplers as isolating element between secondary sided error amp and primary side pwm control. Some people mention it's possible to use kind off pwm-style to interface the error signal. I realize how this may be done on the secondary side, but how is the pwm signal actually integrated to become an analouge voltage for pwm control. This should require a pwm carrier frequency many times above the main converter operating freq.
Any advice is appreciated.
Stefan