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LM5002升压问题:5V无法升到48V,空载下最多到40V

电路图如下,一开始怀疑电感参数不对,但换成100uH后输出电压更低,后来把两个330uH的电感并联,输出电压提高了2V,还是到不了48V。我用的10mm*10mm的电感,应该不存在功率不够的问题。请大神帮忙分析下啥原因,谢谢!