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Under the Hood of Flyback SMPS Designs Question

Hi team, 

I have some questions about Under the Hood of Flyback SMPS Designs. could you please give me some comment on my questions, thanks.

https://www.ti.com/seclit/ml/slup261/slup261.pdf

1.) In the yellow part (Page 9), why "the primary current causes the voltage to rise very quickly when the main output is heavily loaded" ?

2.) In the yellow part (Page 9), why the auxiliary output is fully loaded, this ringing is clamped. but light is not clamped? because I don't see the waveform, it is hard for me to understand it.

3.) in the yellow part (page 9), why At light load, this results in a much higher auxiliary output voltage, which can sometimes even exceeding twice its nominal value.