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LM5175: LM5175芯片,要求输入9V~36V,输出28V带载6A,目前输入最高只能到20V。带载也只能到3A问题

Part Number: LM5175

HI 

        TI,你好。目前我设计一款要求输入9V~36V,输出28V带载6A的电源,过载保护电路我没有启用直接到地的原理图,我实现测试时,发现输入电压无法达到36V,最高只能到20V后就出现驱动烧坏问题,而且带载也不行,麻烦帮忙分析下原理图是否存在问题,