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UCC2808A-2Q1: 芯片输出在轻载的时候占空比直接从10%跳到50%

Part Number: UCC2808A-2Q1

参考器件规格书设计FB反馈的UCC2808推挽电路,变压器采用10:10:10:10变压器,开关频率100k,实际调试时发现芯片输出在轻载的时候占空比直接从10%跳到50%,无论是用FB反馈还是comp反馈都会有这个问题,想请教一下原因