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SMPS flyback isolated, 230VAC to 3.3VDC @1A. Signals of primary and secondary side of optocoupler.

Question asked by jajdek.wojciech on Mar 18, 2014
Hi,
I am making SMPS as in title based on VIPER17HN. My concern is if the voltage on both sides of optocoupler should be equal. On diode side i have nice stable 3V, while on second side (the one by FBpin) there is 0,5V with noise. Output is in range of 3.2 to 3,36 depending on load with max 0.8A with 3.2V output. I want it to be more stable so i think mby the singals on opto sides are bad. 

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