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UCC28600具有多模式功能，这个功能靠FB端来控制，而FB端直接连接光耦，这个光耦的CTR选择是否会影响到模式之间的转换点？光耦的次级端设置是否会影响到模式的转换，如何设置比较好？其多模式转行的功能原理是如何实现的？
