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LM3478输出电压带载后电压降低,输出电流不够,请大神解答一下

图中M1由于器件问题用的是IRF540,D1用的是1N5822,实际问题描述,开关工作频率250K,输入电压7~24V,空载时输出电压为12V,加上负载后电压降到7.5V,希望能够得到指导谢谢!