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TPS40077: SW only outputs every 8 SS cycles: Typical Fault Protection happens

user5246875
Intellectual 260 points
Part Number: TPS40077

schmatic and the loop compensation excel are as the pictures.

I want to have 4V 15A output with 24V input.

And next is the waves I got .

Ch1:SS;Ch2;SW;Ch3:Vouput;Ch4:Boost

Ch1:CO(current output);Ch2:SW;Ch3:VO(Vouput);Ch4:IKIM(ILIM pin's voltage)

I guess the actual condition is as datasheet Figure 27,but I can't know how to fix it.

Please help!