TNY274-280 control loop

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Heelo,
I would like ask you about the control loop of TNY274-280 devices, because I'd like analyze the stability and dynamics of our power supply surce. I've read that the switching cycle is always finished when it's once started - so it's only ON/OFF control.

But, there is also written that the current limit is given by the state machine. Could I know how the current limit is computed?

Best regards,
Martin