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为何LM5023加同步整流效率低

Other Parts Discussed in Thread: LM5023, UCC24612

用LM5023做的准谐振开关加同步整流输出,想在24V输入5V5A输出达到85%以上效率,结果做出来的还不如反激加整流管整流的效率。从波形看,转换器是在准谐振状态且同步整流也是达到了同步的功能的。不知为何?上图中CH1:同步驱动输出,CH4:同步整流管的VDS;下图中CH1:开关管的VDS,CH4:开关管的VGS.。测得的效率只有75%。最小时只有66%的效率。