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LM5045不能进同步整流

Other Parts Discussed in Thread: LM5045

请指教

最近调一款全桥电源。选用的LM5045作为主控,在调试过程中发现不容易进同步整流,偶尔开机可以进入同步整流模式,多数时候都是二极管整流模式,初步怀疑是光耦输出到COMP脚的电流太大,导致开机时占空比太小,试着增大光耦输出到COMP脚的电阻,效果不明细,电阻超过3.3K(光耦5V供电)后变换器就开路了。不知道是什么原因,望大神们指点,不胜感激。