Analyse the internal TNYXXX circuit

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There is long time that I'm using TNYxxx series like TNY255 in power supply switching which when I analyse

the internal of TNYxxx circuit's there is a flip-flop.
my question is that why this (flip-flop) has to be in internal circuit?
what's the main reason for using the flip-flop?
does it possible replace it with any other means?

That's our Intellectual property design inside the IC , we don't recommend or suggest any thing to the internal of our IC.