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UCC28070A: 电流传感变压器相关元件选择

Part Number: UCC28070A

 请问1、这三种方式的优劣之处?2、第一种方式CRST怎样计算?第三种ZrstZ怎么计算?3、官方辅助计算工具里图Crst用得是4.7P,WEBENCH® Designer里推荐图纸是47P