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TMS320F280049: zero cross question about TIDA-01604

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

Dear C2000 expert,

Regarding to TIDA-01604, there are some specific operation for low and high frequency switch component, I think I can understand.

But there is an addition operation that clearing current loop integrator during the cross position, can you help me know why?  As my understanding, the current loop output shall be a max value since the duty cycle should be almost 100% while VAC at 0V to maintain the Vout.  Thanks...