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Thanks, The PI engineers on their PI forum say its voltage mode when peak current is above 55% of imax.

Also i think we are talking at cross purposes again, because yes, it is not in Voltage Mode control at light load. (ie, when ipeak is at or less than 55% of imax)

The datasheet description nowhere depicts a peak current being taken to a PWM comparator along with the error amplifier  signal.

The entire chapter 8 of  Dr Basso's book is  referring to it as Voltage Mode Control.....are you saying that Basso's entire 8th chapter of this book is wrong?

[URL unfurl="true"]https://www.amazon.co.uk/Designing-Control-Linear-Switching-Supplies/dp/1608075575[/URL]

Dr Basso must have had permission from Power Integrations to write that. Dr Basso is one of the foremost SMPS control engineers in the world today.

According to you his entire 8th chapter is full of serious errors. ie mistaking Current Mode control for Voltage Mode Control.

Also, if its current mode then one would need to know the current sense resistors value , as its a needed feedback loop parameter.

I suspect that anybody can say anything no matter how outrageous about TOPswitch now  and get away  with it, because the Innoswitch appears to be the all encompassing part of Power Integrations now....at least regarding  offline flybacks. Many TOPswitchs are now obselete or "not recomended for new designs".

Thanks but its only in voltage mode  when ipeak is >55% of imax.