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WEBENCH® Tools/TPS53647: Output Voltage Scaling problem with tps53647

Part Number: TPS53647

Tool/software: WEBENCH® Design Tools

A design use the tps53647 to output 3.3V @ 100A.  

The schematic is designed by the webench except the Output Voltage Scaling resistor.

I use 16pcs  2.5ohm  Cement Resistors as the load.

PWR_TPS53647_4PHASE_3V3_MODULE.pdf

when I power up the tps53647  board,  the output doesn't work .

It  seems like the 3v3 output is over current protected( the up pic.)

I remove the Output Voltage Scaling resistors. The output is 1.66V.

I remove all the Cement Resistors, add the Output Voltage Scaling resistors, the output is 2.8V.

How to use the  Voltage Scaling resistors to output 3.3V with tps53647. Could  you Review the Sch? Thanks!