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TPS23754问题

Other Parts Discussed in Thread: TPS23754

     大家好,我做的TPS23754 pd电源,输入DC42V,用EFD20变压器,初级匝数17匝,辅助绕组12匝,输出绕组12匝,输出14.5V,用示波器查看变压器绕组输出端峰峰值达到190V,这是为何??怎么那么高的峰值,如何减小到100V以下。。。