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UCC2897A电源的PWM占空比不断变化问题

tu hs
Prodigy 180 points
Other Parts Discussed in Thread: UCC2897A

UCC2897A设计一款72V转12V电源, 发现如果接入电流反馈，则PWM占空比会不断变化，断开电流反馈的Rf则PWM为正常的矩形波，检测电流互感器后的检测电阻两端，发现电流振荡

请教可能是什么原因？