Hi,
I have designed a 30V@0.5A DC DC boost converter (Nominal input voltage = 28V). I am facing issues in optocoupler feedback controlling.
a) If I connect Optocoupler Pin(3) to ground and optocoupler Pin(4) to FB pin (Pin 2) of UC3844AD feedback is not controlling
b) If I connect Optocoupler Pin(3) to FB pin (Pin 2) of UC3844AD and Optocoupler Pin(4) to VREF (pin 8) of UC3844AD feedback is controlling.
Can anyone please let me know which way is correct. For reference I am attaching rough connection of both.
Circuit as per a)
Circuit as per b)
Regards,
Karthik K V
