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TIDA-00961: Timing of the Active FETs and Synchronous FETs

Part Number: TIDA-00961

I think the On time of the active FETs are controlled by the voltage Loop. Is that correct?

What controls the On time of the Synchronous FETs? I think they are turned off before Zero crossing of the Inductor current.

Is that correct? What determines the turn off time? 

When I run Build 2 with 150 Watt load The Synchronous FET does not turn on. See attached.

Z4 (green) is voltage across Active FET, Switch Node.

Z5 (gray) is the Synchronous FET drive.

Z6 (Blue) is the Active FET drive.