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TMS320F280049: VOUT filter question about TIDA-01604

Part Number: TMS320F280049
Other Parts Discussed in Thread: TIDA-01604

Dear C2000 expert,

From TIDA-01604, there is 4th order notch filter( 2 serial 2nd order notch filters) for vout sense, and the parameters are the same, can you help me know what's the specific purpose of using 2 notch filters here? 

As my understanding, the notch filter is used to filter the 2nd harmonics caused by Vac, but why using 4th order? Thanks...