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LM22675输出问题

Other Parts Discussed in Thread: LM22670

LM22675-5不能输出5V:

在TI官网上下载的M22675-5.0 PSpice Trans ient Model,电路按照TI官网上仿真生成,如下图所示。输入是21.6V-26.4V,输出5V,电流是0.135A,按照下图在Pspice中进行时域仿真能看到在500us时有一个阶跃,从0V到2.7V左右,但后续电压一直都是2.7V,不能到达5V,请帮忙解答。如果有更好的仿真软件请推荐,Pspice对开关电源仿真太慢。