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UC2845占空比跳变问题

Other Parts Discussed in Thread: UC2845

各位TI的工程师:

       您们好!项目使用UC2845搭建双管反激电路,多路输出,主反馈输出电压为10.6V,该路与原边绕组匝数比是72:5,变压器原边感量1mH,目前在进行启机电压的优化,当输入150V时MOS管占空比达到最大值45%,但是电压加到197V前MOS管占空比不变仍保持45%占空比,在输入电压197V时占空比发生跳变变为31%。请问各位资深专家这种跳变产生的原因可能是什么呢?