michael_xu：
IfyoubreakaFBintotwostagea50%/50%DCtransformer+SRbuck,it'snodountthatonestageefficiencyhigherthantwostage.Giveyouaexample,youonlyoptimalthe48pointefficiency,itispossiblethattwostageishigherthanonestage.Ourdesignengineershavebegantodonethisresearchforalongtime,itactuallythetwostageefficiencyishigherthanonestage.butthecontrolcircuitandthepcblayoutismoredifficultthanonestage.finally,forsome reasons,ourproductadoptonestageforVin=36--75V,Vo=12V/25A,inaQBrick,theefficiencyis95.5%atVin=48,lowerthanSynQor'smodule