In open-loop condition, output voltage is different by LNK409 and LNK419.
Does it have internal circuit the difference?
In open-loop condition, in order to reduce the output voltage to 400V,
I'm using a zener diode of low Vz.
However, it does not work correctly at input voltage AC200V.
To reduce the output voltage, other measures are available?
Please give me a good idea.