LM3150: Higher load

Here is an image of my schmatic and layout, I don't belive i'm hitting a current limit as I have R2_1 (I_lim resistor) currently not populated. 

I have 300uf on the output, I have a mistake in my part information in altium, My calculations show that I need a minimum of 220uf I would assume I have enough on the output. 

I'm looking at the Alternate ripple injection section of AN-1900 how do you caclulate the vaules of Rr,Cr and Cac? When I add anything to this node or to Cff the ouput no longer regulates to 3.3V using the resistor values found using Vout=Vfb x (Rfb1+Rfb2)/Rfb1.

Hi,

I normally follow this equations for calculating the Ripple injection portion of it

How to design a stable Fly-Buck™ converter with COT (Part 1)

TI E2E support forums

The Fly-Buck ™ converter topology is recognized as a versatile isolated bias power supply and is gaining more and more traction in various types of applications. A synchronous buck converter can be configured as a Fly-Buck, but not all control methods...

Thanks

-Arief

I used the formulas found in the referenced materials and I still have a stability issue, when I add Rr=10k, Cr=.01uf and Cac=0.22uf it changes my output voltage from 3.3V to 4.5 - 4.8V (not stable) as well as the switching frequency goes from 300kHz to 430kHz. I didn't see any of this during my initial testing with a resistive load, I then moved it to power my PCB and saw that my upper FET was at 140°C after 10 minutes and started to probe with a scope. I now have the instability issue with a resistive load also, is there a chance the IC is damaged?