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请教一下WEBENCH使用问题

Other Parts Discussed in Thread: TPS53355

目前使用TPS53355电源芯片,实际输入电压12V,输出3.3V,电流约15A。通过WEBENCH软件设计原理图,在WEBENCH软件中设置如下,Vin:11V(min)~13V(max),Vout:3.3V,Iout:15A,Ambient Temp:30℃。WEBENCH软件给出的原理设计图中,TPS53355芯片VFB管脚(0.6V)外接电阻38.3k到Vout和10k电阻到GND,算出Vout为2.9V,不是设计想要的3.3V,请问WEBENCH哪里设置错了?哪里还需要设置?