Hi , team,

i'm trying this Circuit pdf : https://drive.google.com/open?id=1240GaEOLu_LdQFB7-aODWtbztO7Jl1po

if I divide this ckt into 3 steps
1 UC3843 IC
we successfully get a square wave with 60khz freq. with 45v amplitude when input is 45v.
2 MOSFET We have successfully switched MOSFET using UC3843 IC
3 Flyback Transformer and its feedback optocoupler, whenever we connect the primary MOSFET switching, goes(PWM OUTPUT GOES OFF/NO volt at output) OFF.

in short i'm able to generate 60 khz though UC3843, then swithing to mosfet, but now when i connect transformer with its feedback though Optocpuler is not working.

here all BOM & transformer info I'm using
https://drive.google.com/open?id=1b1ISLl1SsyqEkja_8CrCkjIptvSc85vX

Can someone please help, even I can pay some amount for support ,

thanks in advance

 

Hi , team,

i'm trying this Circuit pdf : https://drive.google.com/open?id=1240GaEOLu_LdQFB7-aODWtbztO7Jl1po

if I divide this ckt into 3 steps
1 UC3843 IC
we successfully get a square wave with 60khz freq. with 45v amplitude when input is 45v.
2 MOSFET We have successfully switched MOSFET using UC3843 IC
3 Flyback Transformer and its feedback optocoupler, whenever we connect the primary MOSFET switching, goes(PWM OUTPUT GOES OFF/NO volt at output) OFF.

in short i'm able to generate 60 khz though UC3843, then swithing to mosfet, but now when i connect transformer with its feedback though Optocpuler is not working.

here all BOM & transformer info I'm using
https://drive.google.com/open?id=1b1ISLl1SsyqEkja_8CrCkjIptvSc85vX

Can someone please help, even I can pay some amount for support ,

thanks in advance

Have you solved your problem? It should be the control loop issue.

 

You might have too high Isense voltage, above 1V. That'll shutdown UC3843. The current sense resistor at 10 ohm seems very high to me.