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LM5021: 仿真时VIN引脚一到20V就会掉到7.25V再重新上升,一直重复

Part Number: LM5021
Other Parts Discussed in Thread: PMP10129

我是按照TI的参考设计PMP10129进行仿真的,OUT没有输出,仿真图和各引脚电压电流如图,请教各位大佬