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为什么我在网站找的750342879变压器的匝数比为1:3.5,而TI公司案例电路图中的匝数比为1:3.9?

Other Parts Discussed in Thread: TIDA-010054

如图,按照这个电路图中的计算,输出电压的确为+15和-4,但是根据实际的变压比1:3.5,输出电压为+13.5和-4,与图中不符。

上图为750342879数据手册,电路图是从https://www.ti.com.cn/tool/cn/TIDA-010054下载的