变压器的小结

1）变压器首先有电感特点，通过电流变化大小来决定电压的大小。

2）变压器的输出端一般用primary widing，在原理图的1:N中由1指示位置，电感没有抽头(是这样吗？)

3）变压器的应用除了隔离，抑制共模噪声(CMRR).

    还有产生需要第三电平波形的功能，比如E1 的HDB3，就是这样产生、 (P,N : (1,0) (0,1)  (1,1 or 0,0) )

4）SI and safety

   Crosstalk Attentuation

Return Loss

  Surge Voltage Capability ：？？当大电压过来，是否会引起磁饱和，从而保护次级？

5) To make a 1CT:1 ratio from a 1CT:2CT ratio, use only one-half of the secondary (2CT) winding.

A. OCL (primary inductance) is measured at the primary winding. Turns ratio is specified primary:
secondary.
B. To make a 1CT:1 ratio from a 1CT:2CT ratio, use only one-half of the secondary (2CT) winding.
C. It is possible to use the same transformer model for the three impedance levels of T1 (100 W) and CEPT
(75 Ω & 120 Ω  (即E1)). For specific connection information and resistor values, refer to IC vendor’s data
book.

D.Dual Ratio Transformer (T1071NL and T1145NL) - These transformers have tapped secondary windings