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UC2845: 输出异常

Part Number: UC2845

UC2845的震荡频率参数如规格书上下图所示,PWM波形频率为震荡频率一半。现实际使用参数Rt=10k,Ct=1nF,测试PWM输出频率在86k左右,为正常;测试发现当Rt=20k,Ct=0.47pF时,输出频率在184k左右,为理论值的一倍,这是什么原因?