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会轻微有一些温度差异,比方说输出都是3A, 24V输入时效率86%,占空比是22.8%, 16V输入时效率86.7%,占空比是34%,就功耗而言主要差异在于芯片内部的MOS, Rdson 120ohm, 前者功耗是3*3*22.8%*0.12=0.24w, 后者功耗是3*3*34%*0.12=0.36w, 如果芯片热阻采用T封装45℃/W,芯片温度差异可以估算为45*(0.36-0.24)=5.4℃. (温度差异是5℃左右,以上数据来自TI的webench仿真)