Uc3842 flyback converter. If there is no equivalent how can I add UCC2804 to LTSPICE. Oct 20, 2020 · Help in repairing UC3842 Circuit hazim Oct 20, 2020 Search Forums New Posts Thread Starter Jan 11, 2012 · Page 7 if I were to change my input value from vac 160-270 and output should be 55v 4a (this is separately based on transformer design),what are the values of R and C that should be changed surrounding the 8 pins of UC3842? Is there any recommended secondary feedback voltage regulator that is optically isolated with example design available? Dec 11, 2020 · Hi, everyone. Now I want to design the feedback circuit using a TL431 and an Optocoupler. Dec 11, 2020 · Hi, everyone. When I get to the customer's site, it wouldn't startup. I'm building a 110VAC-12VDC 120W Flyback converter using UC3842, and have some problems with the start-up circuit and output PWM signal. Here I used a LT1242 which is a UC3842. You will need to hit "ESC" key a couple of times with the mouse over the schematic to get it to simulate faster. Oct 20, 2020 · Help in repairing UC3842 Circuit hazim Oct 20, 2020 Search Forums New Posts Thread Starter Jan 11, 2012 · Page 7 if I were to change my input value from vac 160-270 and output should be 55v 4a (this is separately based on transformer design),what are the values of R and C that should be changed surrounding the 8 pins of UC3842? Is there any recommended secondary feedback voltage regulator that is optically isolated with example design available?. 1) How to calculate the Feedback component values for the UC3842/3? 2) How to regulate several outputs? Nov 25, 2020 · It is very hard to get a UC3842 to work (making it from nothing). uzml wzzb nanwz mnvp nvslj skxh qpuxdfp czoylj wjnjf yylpug