when performing various test with PFS726 we noticed, that is working very well
until 200W of output loat, but when load was increased to about 250W the output
voltages goes low as 310V from initial 385V. Till 200W the power factor is very high
what we can see from input currerent waveform.
The question is what could be a reason, since we use the same circuits like for 900W version
with PFS729 from data sheet?
Which components could have such effect? We also tryed to cool down PFS726 with
external ventilator if for some reason some temperature trip accured.
thanks and best regards.