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LM3478 输出电压不对

Other Parts Discussed in Thread: LM3478, TPS43000

我采希望等到帮助。用 TI 网站的 WEBENCH DESIGNER 设计的。输入电压 3V- 4.5V ,输出电压 3.3V, 3A 。 但输入电压<3.4V  时,输出电压<3V ,我用网站的上的仿真,是可以的。为什么这样?很急,希望等到帮助。