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TI提供的方案,如何设计未知参数



如题按照TI提供的方案设计输入220,输出5v1A   的初级反馈反激电路 ,  打算自己绕变压器,可是变压器参数未知。想问问变压器初次级线圈数如何确定? 还有其他参数。