uc3842 - Flyback converter question using UC3842 All drean About Circuits Help in repairing UC3842 Circuit All About Circuits Jan 11 2012 if I were to change my input value from vac 160270 and output should be 55v 4athis is separately based on transformer designwhat are the values of R and C that should be changed surrounding the 8 pins of UC3842 Dec 11 2020 Flyback converter question using UC3842 Thread starter johnson35762 Start date Dec 11 2020 Tags Dec 11 2020 Hi everyone I39m building a 110VAC12VDC 120W Flyback converter using UC3842 and have some problems with the startup circuit and output PWM signal In the beginning the design spec at first Input 110VAC Output12VDC 10A Switching frequency 107kHz Transformer core PQ3535 unknown UC38423 Compensation Feedback All About Circuits Design a SMPS with UC3842 All About Circuits Sep 26 2024 I39m repairing a monitor with a SMPS utilizing a UC3842 IC I39ve tested the monitor in my shop and worked fine When I get to the customer39s site it wouldn39t startup The difference is the input AC My shop 120 to 130 VAC He39s shop is 118VAC At his site I tested the Vcc voltage to pin 7 of the UC3842 Dec 17 2024 UC3842 is good enough for a IRF840 100kHz Probably not at higher frequencies or with a bigger MOSFET It is OLD as ronsimpson says and so is the IRF840 but they both still work You39ll get performance like an OLD flyback design THere are lots of designs like that out there still working and still being made cumak Flyback converter question using UC3842 All About Circuits Jan 10 2020 Hi I want to design a Flyback no problem with the transformer Clamp etc Now I want to design the feedback circuit using a TL431 and an Optocoupler 1 How to calculate the Feedback component values for the UC38423 2 How to regulate several outputs Oct 20 2020 It is part of the current mode feedback control circuit of the UC3842 Make sure in normal the I sense voltage is less than 1V to avoid current limiting kicks in To design for a constant current source the feedback voltage is not sensing from the output SOLVED SMPS UC3842 ULVO issue All About Circuits SMPS with UC3845 All About Circuits UC38423 Current Sense Pin All About Circuits Jan 20 2017 phenomenon to realize an adjustable module PWM UC3842 using switching power ICopen loop system Vf pin was connected with Potentiometer adjustment feedback voltage compensation pin was not connected the result was not as i expected i can indeed change the duty cycle via potentiometer outside but in a very small arrange and not accurate uc3842 Adjustable module All About Circuits Oct 20 2020 I have an electronic 48V 30A battery charger This charger had problem with UC3842 2 times and we repaced it each time and got the charger working again This time we replaced it and can39t find any other bad component but the charger is not working The supply voltage on the IC between pin 7 and 5 is varying from predebut approx 115VDC to 13VDC
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