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TIDA-00381: How does the phase shift work

Aiden zhang
Prodigy 180 points
Part Number: TIDA-00381
Other Parts Discussed in Thread: TIDA-00318

Hi，

 I saw the reference design of TIDA-00381 on TI's official website.This reference design is very similar to the project we are planning to do.

The overview of TIDA-00381 mentions the following:

I downloaded the firmware of TiDA-00381 and read the code carefully. 

DPWM2 is used for primary side drive and Is configured as the sync master. DPWM0 is used for primary side drive and Is configured as the sync slave.

But DPWM0 does not shift phase with respect to DPWM2 at any time.(Dpwm0Regs.DPWMCTRL0.bit.MASTER_SYNC_CNTL_SEL = 0).

So my question is:

1、How does TIDA-00381 perform phase shift control when operating at ramp up, light load, low output voltage？

2、How does the synchronous rectifier work when operating at ramp up, light load, low output voltage？

3、Is there a design document for TIDA-00318 that describes this case in detail？

I look forward to your recovery. Thank you！