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TPS63805: How to improve the transient performance with "Feedforward Pulse Injection Circuit"?

Part Number: TPS63805

Hi,

Could you help me in this case? 

The output voltage of the TPS63805 dropped up to 700mV. To improve transient performance, the engineers are looking at Feedforward Pulse Injection Circuit. Below is a screenshot from SLVAEE0. How to calculate the value of  Cff and Rff? Is the inverter necessary? and what are the requirements for the inverter?

Besides, is there anymore materials to share?

Regards,

Hailiang