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使用TLV3501做PWM波形仿真,出来的波形是脉宽没有变化的波形

Other Parts Discussed in Thread: TLV3501

如下图,使用TINA-9仿真由tlv3501产生PWM波,模型是从TI官网上下载的。

但是输出 的PWM形波没有变化,是电路有问题?还是模型/TINA的问题。

因为要画电路原理图了,心里没有谱呀。请帮忙分析,感谢:

仿真电路如下:

输出波形:PWM波形没有变化