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TPS65279 做12V恒压输出该如何设计?

Other Parts Discussed in Thread: TPS65279

请教下大神,我现在想用65279来实现Vin 16.8V,Vout 12V输出, 可以做到吗?为何我分压电阻按数据手册上算出的值来搭R1=91K,R2=5K,但是Vout始终得不到正常值,也就是12V?而且数据手册也没有给出输出Vout=12V的参考电路?莫非不能输出?那为何在芯片参数筛选时又显示能够?请大神赐教,该如何搭此电路。