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1.1.1 Start-up Phase
As any member of the VIPer family, VIPer22A has an integrated high voltage current source linked to
Drain pin. At the startup converter, it will charge the VDD capacitor until it reaches VIPer startup level
(14.5V), and then the VIPer22A starts switching.
1.1.2 Auxiliary Supply
VIPer22A has a wide operating voltage range from 8V to 42V, respectively minimum and maximum
values for under-voltage and over-voltage protections.
This function is very useful for achieving low stand-by total power consumption.
· in normal full load, the VDD voltage of the device must be lower than the over-voltage protection;
· in short circuit, the VDD voltage must be lower than the shutdown voltage. Actually, this condition leads
to the well known hiccup mode in practice;
· in no load condition, the VDD voltage must be higher than the shutdown voltage.