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LM2576HV 48V转 24v 问题

现在 CIN 我用20uF、 Cout = 1000uF ,L=100uH  、D1 为 MBR360    我要用这个芯片把  48V VIN   转成 24VOUT  使用芯片 LM2576HVS-ADJ    现在问题 一上电芯片就直接烧了。 测量之后发现输入和地之间短路了