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LM5030的仿真问题

Other Parts Discussed in Thread: LM5030

最近计划用LM5030做一个推挽的DCDC升压电路,我从官网上下载了spice仿真模型,导入LTSPICE中(用过tina仿真但是没有做出波形来,只好用LTSPICE),做了一个开环的仿真如图,但是输出的两路pwm信号并不完全对称,理想情况下应该是一个绿色脉冲一个蓝色脉冲,但是仿真结果经常出现一路输出多个脉冲的情况,请问这是仿真模型有问题,还是仿真方法有问题?实际用这个芯片做出来的效果会不会也是这样?谢谢!