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TIDM-02008: Notch filter configuration in TIDM-02008

Part Number: TIDM-02008

Hi expert,

I met a question when I develop solar inverter/PFC based on C2000/TIDM-02008.

The global variable initialization functions use 120Hz/100Hz to configure the notch filters for voltage loop.

Why use wn2 = 2 * Fs * tanf(120Hz/100Hz * pi * Ts) as notch frequency in the function?

What's the meaning of 2* tanf(120Hz/100Hz * pi * Ts) / (1/Ts)?  Although its equal to 120Hz/100Hz * 2pi when Ts is very small.