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TINA/Spice: buck DC-DC原理图仿真相关问题

Erogan
Prodigy 130 points
Other Parts Discussed in Thread: TINA-TI

Tool/software: TINA-TI or Spice Models

搭建了一个buck开环基本电路图（未加环路负反馈部分），输入激励3V直流电压，High side NMOS控制duty cycle为40%，理论上输出

电压应该为3*40%=1.2V。但是实际上仿真输出为3.28V。为什么？ 具体仿真波形细节请看附件。4426.buck.TSC