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请问PWM control IC 的软启动到正常控制是如何过渡的?

Other Parts Discussed in Thread: UCC28220

软启动一般是在开机时刻对IC外接电容C恒流充电,由电容电压代替外部控制电压,使占空比由0逐渐变大。如我使用的UCC28220.但我一直不明白何时ctrl端的控制电压开始控制占空比大小,也就是说软启动结束的条件是什么?

如上图,是指SS端电压高于CTRL端电压后,软启动结束,由CTRL输入电压控制占空比吗?

Datasheet第12页只给出了SS电容充电电流大小,没有说SS端电压充到何时软启动结束。

期待大家的回复,谢谢!

UCC28220.pdf