![](http://u.dianyuan.com/bbs/u/32/1123722824.jpg?x-oss-process=image/watermark,g_center,image_YXJ0aWNsZS9wdWJsaWMvd2F0ZXJtYXJrLnBuZz94LW9zcy1wcm9jZXNzPWltYWdlL3Jlc2l6ZSxQXzQwCg,t_20)
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工作条件如下:
1.输入范围:AC95-130V
2.输出电压:
a.5V:4A
b.+12V:0.3A
c.-12V:0.3A
3.工作频率:40K
4.效率:70%
5.磁芯:EC35/3C8(对应Ae=1.09)
6.最大占空比:45%
计算得56T:3T:7T:7T:7T(原边:5V:12V:12V:13V)
图上的是45T:4T:9T:9T:10T
如果5V取4T,则75T:4T:9T:9T:10T.
咋回事呢?这个图很常见,好几个公司的datasheet上都有,变压器的参数相同.