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LM3409-Q1: 输出不理想,如何分析?

Part Number: LM3409-Q1

下图是PGATE的输出波形

下图为原理图

负载为3R电阻,问题是:

1. 设计的3.5A,实际只有不到2A的输出,饱和原因是什么?

2. PGATE的电压怎么是24V呢?

3. 输出不理想,哪些参数是需要重点考虑的?