TPS92520-Q1: TPS92520 debug with TI USB2ANY

Part Number: TPS92520-Q1
Other Parts Discussed in Thread: USB2ANY

Tool/software:

Hi Expert,

I  am using the TI tool USB2ANY to bebug TPS92520 board with SPI interface. Below step 

A.  I power up without any operation, device should go into standalone mode with 450Khz PWM and CH1 output is 30V with VIN=30V. 

B. I wite  "DC C3 "  ,then CH1 output is 1.88V ---Standalone mode to Load mode

C. With "80 0F" --Enable CH1 and CH2 output---but I can't find any ouput 

Could you help me to understand why I don't got the output in step C ?