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请教隔离反激电源芯片选择

Other Parts Discussed in Thread: LM5021, UC1842, UCC28740, TPS40210

需求:输入15-100VDC,输出隔离24VDC,1A

问题:

1、TI很多的芯片系列,例如属于PWM控制器的UC1842系列,属于反激控制器的UCC28740系列,LM5021系列,感觉用法都差不多,那么应该如何选择呢?

2、由于存在输入电压低于24V的情况,变压器原边匝数是不是小于副边匝数,这样会有什么问题吗?