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多路输出单输出开关电源问题(在线等)



大家好,我想问下

1、TI有没有多输入单输出的开关电源芯片,例如5V、10V、30V三路输入,20V输出这样的IC,

2、若果没有的话自己实现,可以分别调整到20V,然后怎么并到一起最后单输出??