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LM5160变压器的设计问题

Other Parts Discussed in Thread: LM5160, LM5160A

您们好,连续学习了很多天,利用lm5160芯片设计电路时,开关频率是怎么设置的,,,资料上面的最小恒定导通时间Ton和Toff怎么得来的,看资料上不是计算得来的,还有设计双路输出时,变压器设计还是不会设计,我设计的一个电路原边:副边=1:2.5原边=10匝。副边=25匝,VIN=18-45, VOUT=5V,I1=0.6A,隔离输出VOUT2=12V,I2=0.4A,,,只要带载后,副边电压就会发生比较大的压降。。帮我解决一下。。谢谢